Sodium is used in "yellow" muted lights because it produces a yellow-orange light when it is heated.
What is Sodium?
Sodium is a chemical element with atomic number 11 and the symbol Na (derived from the Latin natrium). It is a delicate, silvery-white metal that is very reactive. Due to its placement in group 1 of the periodic table, sodium is an alkali metal. 23Na is the only stable isotope of it. The free metal must be prepared from compounds because it does not exist in nature. The sixth most common element in the crust of the Earth is sodium, which can be found in a variety of minerals like feldspar, sodalite, and halite (NaCl). Since the action of water has been leaching sodium ions from the minerals of the Earth for aeons, many salts of sodium are highly water-soluble. As a result, sodium and chlorine are the most prevalent dissolved elements by weight in the oceans.
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20 POINTS PLEASE HELP
NADP, nicotinamide adenine dinucleotide phosphate forms NADPH by combining with the H+ ion and two electrons. Thus, option C is correct.
What is NADP ?NADP, nicotinamide adenine dinucleotide phosphate is a reducing agent in electron transport chains of metabolic processes in living things. NADPH is the reduced form of NADP.
In biochemical reactions such as glycolysis, photosynthesis etc, NADP plays a significant role as a reducing agent. NADP and NADPH together are called the redox couple and they maintain cellular redox homeostasis.
Hydrogenation of molecules is called reduction and thus the NADP+ reduces to its NADPH by combining with a two electrons and H+. Hence option C is correct.
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An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. What is the density of the object.
An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. the density of the object is 3 g/mL.
given the data as follows :
mass of object = 18 g
volume of object = final volume - initial volume
volume of object = 26 mL - 20 mL
= 6 mL
the density expression is given as:
Density = mass / volume
Density = 18 g / 6 mL
Density = 3 g/mL
Thus, An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. the density of the object is 3 g/mL
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A 2.3kg object accelerated from a rest to a speed of 38.6 m/s in 37 seconds what is the answer in N
The force acting on a moving body can be determined using its acceleration and mass. The mass of the object is 2.3 Kg the force when it is accelerated to 38.6 m/s in 37 seconds is 2.4 N.
What is force?Force is an external agent acts on a body to change it from the state of motion or rest. Various kinds of forces include gravitational force, frictional force, nuclear force etc.
In physics, force is the product of mass and acceleration. Acceleration of an object is the rate of change in its velocity. Here, the change in speed from rest is 38.6 m/s and the time taken is 37 seconds hence the acceleration is:
a = 38.6 m/s / 37 s
= 1.04 m/s².
Now, the force can be calculated from by taking the product of mass and acceleration as follows:
F = ma
= 2.3 Kg × 1.04 m/s²
= 2.4 N.
Hence, the force acting on the object to change it from rest is 2.4 N.
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how did the scientist explain the relationship beetween the colors observed and the structure of the atom
Answer:
The colors observed is a sign that definite energy transformations occurs inside the atom gives off light. It follows that electrons must occupy orbits of fixed energy.
Hope that helps!
Indicate how the concentration of each species in the chemical equation will change to reestablish equilibrium after changing the concentration of the reactant or product. An up arrow indicates an increase in concentration, a down arrow indicates a decrease in concentration, and leaving it blank means there is no change in the concentration. after the concentration of Br₂ is decreased after the concentration of HBr is increased H₂(g) + Br₂(g) O 0 □ ↓ Answer Bank ↑ 2HBr(g) 0 □
The concentration of species in the reaction changes the reaction in the following ways: decrease carbon dioxide = forward direction of reaction.
The direction of the reaction can be assessed by the following. On increasing the concentration of the reactant the reaction processes in the forward direction. On increasing the concentration of product the reaction processes in the backward direction.
The given equilibrium is:
2CO(g) + O2(g) ↔ 2CO2(g)
increase CO = forward direction of reaction
increase oxygen = forward direction of reaction
decrease CO = no change in equilibrium as reaction not processes.
decrease oxygen = no change in equilibrium as reaction not processes.
increase carbon dioxide= reverse direction
decrease carbon dioxide = forward direction of reaction.
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Hydrogenation of cholesterol
The molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
What is cholesterol?
Any member of the lipids class of specific chemical compounds is a kind of cholesterol. It is a sterol, a class of lipid (or modified steroid). All animal cells produce cholesterol, which is a crucial part of the membranes that make up those cells. It is a yellowish crystalline solid when chemically separated. It is possible to increase the saturation of fatty acids by adding hydrogen to unsaturated fatty acid chains, which connects the hydrogen atoms to the saturation sites.
Hence, the molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
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An element from Group 13 bonds with an element from Group 17. Which formula correctly depicts the correct chemical formula for elements from these two groups?A AlCl3AlCl 3 B BFBF C BrGa3BrGa 3 D B3I
When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from group 13 elements and group 17 is AlCl₃.
What is chemical formula?
Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. the compound that will be formed from group 13 elements and group 17 is AlCl₃.
Therefore, the correct option is option A.
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How is a tornado different from a hurricane
A. A tornado causes less damage to an ecosystem
B. A tornado brings more rain
C. A tornado is much smaller
D. Hurricanes do not impact life on land
Answer: C. A tornado is much smaller
Explanation: A tornado can be a mile long while hurricanes can be 50 miles long.
How many electronic under layers are there on level n=7?
The seventh shell contains 49 orbitals, making the total number of electrons in 49 orbitals 98.
How do Group 7 elements appear?characteristics of elements in group 7
At room temperature, each halogen exhibits the properties listed below: A light yellow gas is fluorine. A deadly green gas, chlorine is poisonous. The reddish-brown liquid bromine is poisonous.
Since the group number is 7, this means that the outer shell of halogen atoms contains seven electrons (energy level). These atoms gain a single electron in order to stabilize themselves and adopt the same structure as the nearby noble gas (rather than losing seven electrons which would take much more energy).
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a carbon is found to form two oxide, which contain 42.9% and 27.3%carbon respectively, show that these figure illustrate the law multiple proportion
The figures illustrate the law of multiple proportions because the empirical formulas of the two oxides are CO and [tex]CO_2[/tex] respectively.
Law of multiple proportionsThe law of multiple proportions states that when two elements combine with each other to form more than one chemical compound, the weights of one element that combine with a fixed weight of the other are usually in small whole-number ratios.
The figures mentioned in the problems can be tested for agreement with the law of multiple proportions by finding the empirical formulas of the two oxides formed against a fixed weight of carbon:
The analysis of the first oxide is as follows:
C = 42.9
O = 100-42.9
= 57.1
The equivalent mole of each atom will then be calculated by dividing each atom by their respective molar weights:
C = 12 g/mol
O = 16 g/mol
C = 42.9/12
= 3.56
O = 57.1/16
= 3.56
Thus, the empirical formula of the first oxide is CO.
The second oxide:
C = 27.3
O = 100 - 27.3
= 72.7
The equivalent mole of each atom will be:
C = 27.3/12
= 2.27
O = 72.7/16
= 4.54
Dividing the moles by the smallest mole
C = 2.27/2.27
= 1
O = 4.54/2.27
= 2
Thus, the empirical formula of the second oxide is [tex]CO_2[/tex].
The first oxide gives CO while the second oxide gives [tex]CO_2[/tex]. The weight of oxygen that combines with the fixed weight of carbon can be seen to be in simple whole-number ratios (1 and 2).
In other words, the figures quoted obeys the law of multiple proportions.
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What is the Internal Energy of a Human Body? Define internal energy as Delta E.
SHOW ALL WORK!
20 points
The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.
In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.
Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.
The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.
ΔU = [tex]E_{B}[/tex] - [tex]E_{A}[/tex] where [tex]E_{B}[/tex] and [tex]E_{A}[/tex] are the initial energies of states A and B. Or we can also write the equation as:
ΔU = ΔE
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0.499 g of NaOH (MM = 40.00 g/mol) is dissolved in 150.00 mL of water, what is the theoretical molarity of NaOH?
Answer:
0.0833 M NaOH
Explanation:
To calculate the molarity, you need to
(1) convert grams NaOH to moles (using the molar mass)
(2) convert mL to liters
(3) calculate the molarity
It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value with the smallest amount of sig figs (0.499 = 3 sig figs).
0.499 g NaOH 1 mole
-------------------------- x ------------------ = 0.0125 moles NaOH
40.00 g
150.00 mL H₂O 1 L
--------------------------- x ------------------ = 0.15000 L H₂O
1,000 mL
Molarity = moles / volume
Molarity = 0.0125 moles NaOH / 0.15000 L H₂O
Molarity = 0.0833 M
what is the limiting agent in 3 C2H3O2H + Al(OH)3
To solve such this we must know the concept of chemical reaction and concept of limiting agent. Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting agent in the given balanced equation.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The balanced reaction is
3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H + Al(OH)[tex]_3[/tex][tex]\rightarrow[/tex]
The limiting reagent depends on the mole ratio and not on the masses of the reactants present. 1 mole of Al(OH)[tex]_3[/tex] need 3 moles of 3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H. So, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
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What is unique about the orbitals around the nucleus of an atom?
Responses
Each orbital has its own set of neutrons.
Each orbital has its own set of neutrons.
Each orbital has electrons of a specific energy level.
Each orbital has electrons of a specific energy level.
Each orbital contain protons.
Each orbital contain protons.
Each orbital has only one electron.
The unique property of the orbitals around the nucleus of an atom is that each orbital has electrons of a specific energy level; option B.
What are orbitals in an atom?Orbitals in an atom are regions of space around which electrons are found in an atom.
The orbitals in an atom are also described as energy levels.
Electrons are arranged in atomic orbitals from orbitals having the lowest energy to orbitals having the greatest energy.
The outermost orbital of an atom is known as the valence orbital and electrons found there are known as valence electrons.
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The reaction of 50 mL of gas with 150 mL of gas to form ammonia via the equation:
N (g) + 3H (g) -----> 2NH (g)
will produce __________ mL of ammonia if pressure and temperature are kept
At constant temperature and pressure, 100mL of ammonia will be produced.
What is ammonia?Ammonia is described as an inorganic compound of nitrogen and hydrogen with the formula NH₃. It is a stable binary hydride, and the simplest pnictogen hydride, ammonia is a colorless gas with a distinct pungent smell.
Gay-Lussac's law of combining volumes states that the volume of gases which take part in a chemical reaction bear a simple whole number ratio to one another and to the volume of products if gaseous, when measured at constant temperature and pressure.
According to the Equation of reaction: N₂(g) + 3H₂(g) ----> 2NH₃(g)
From the equation of reaction given above,
1 mole of nitrogen gas reacts with 3 moles of hydrogen to produce 2 moles of ammonia. Therefore,
50 mL of nitrogen will react to produce produce 2 * 50 mL of ammonia = 100ml of ammonia
Also, 150mL of hydrogen will react to produce 2 *150mL/3 of ammonia = 100ml of ammonia.
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Which of the following is the correct formula to calculate percent by mass? [Mass of solution (g) + mass of solute (g)] × 100 [Mass of solute (g) − mass of solution (g)] × 100 [Mass of solute (g) ÷ mass of solution (g)] × 100 [Mass of solution (g) ÷ mass of solute (g)] × 100
Considering the definition of percent by mass, the correct answer is the third option: the correct formula to calculate percent by mass is [Mass of solute (g) ÷ mass of solution (g)] × 100
Definition of percent by massThe percent by mass is a measure of the amount of mass that an element occupies in a compound and it is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.
So, the percent by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:
percent by mass= [Mass of solute (g) ÷ mass of solution (g)] × 100
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I have an unknown volume of gas held at a temperature of 126 K in a container with a pressure of 31 atm. If by increasing the temperature to 209 K and decreasing the pressure to 19 atm causes the volume of the gas to be 9.4 liters, how many liters of gas did I start with?
The volume that was started with if the temperature of 126 K in a container with a pressure of 31 atm is 3.47L.
How to calculate volume?The volume of a gas can be calculated using the combined gas law equation as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁ = initial pressureV₁ = final pressureT₁ = initial temperatureP₂ = final pressureV₂ = final volumeT₂ = final temperatureAccording to this question, an unknown volume of gas held at a temperature of 126K in a container with a pressure of 31 atm.
If by increasing the temperature to 209 K and decreasing the pressure to 19 atm causes the volume of the gas to be 9.4 liters, the initial volume is calculated as follows:
31 × V₁/126 = 19 × 9.4/209
0.246V = 178.6/209
0.246V = 0.854
V = 3.47L
Therefore, 3.47L is the volume of the gas that started.
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If a sulfuric acid (H₂SO₄, MM = 98.09 g/mol) solution is completely neutralized with 61.37 mL of the NaOH solution above what was the mass in grams of sulfuric acid in the solution. Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)
Assuming the concentration of the NaOH solution that reacted with the sulfuric acid is 1.0 M, the mass of the sulfuric acid that reacted is 3.01 g.
What is a neutralization reaction?A neutralization reaction is a reaction in which an acid reacts with a base to form salt and water only.
In the given reaction, a given amount of sulfuric acid was neutralized by 61.37 m:L of a NaOH solution.
The equation of the neutralization reaction is given below:
2 NaOH (aq) + H₂SO₄ (aq) ----> Na₂SO₄ (aq) + 2 H₂O (l)
The mole ratio of the reaction shows that 2 moles of NaOH solution will react with 1 mole of H₂SO₄ solution.
The moles of NaOH reacting = concentration * volume in liters
The concentration of the NaOH solution is not given. Assuming the concentration of the NaOH solution is 1.0 M
Moles of NaOH reacted = 1.0 * 61.37 mL * 1 L / 1000 mL
Moles of NaOH reacted = 0.06137 moles
Moles of H₂SO₄ reacted = 0.0614 / 2
Moles of H₂SO₄ reacted = 0.0307 moles
Mass of H₂SO₄ reacted = 0.0307 * 98.09
Mass of H₂SO₄ reacted = 3.01 g
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Please help I have been stuck for a week Which of the following reactions is BALANCED and shows INCOMPLETE combustion
A. 2C5H12 + 1102--> 12CO+ 10H2O
B. 2C5H12 + 1102--> 10CO +12H20
C. C5H12 + 802--> 5CO2+6H20
D. C5H12 + 802--> 6CO2 5H20
The reaction that is balanced and shows incomplete combustion is:
2 C₅H₁₂ + 11 O₂--> 10 CO + 12 H₂0; option B.
What is a combustion reaction?A combustion reaction is a reaction in which a substance reacts with oxygen to release large amounts of heat and light energy.
In the combustion of carbon-containing compounds, carbon dioxide and water are usually produced.
In incomplete combustion of carbon compounds, carbon monoxide or carbon (ii) oxide is produced.
For a balanced reaction, the moles of atoms of elements on the reactant side are equal to the moles of atoms on the product side.
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Which substance (Na, Mg, or Ca) do you identify with and why?
The metals known as Alkaline Earth metals are Na, Mg, or Ca. They are known as "alkaline" earth metals because when they interact with water, they produce "alkaline" hydroxides solutions.
How many metals made of alkaline earth exist?Any of the six chemical elements that make up Group 2 (II a) of the periodic table is an alkaline-earth metal. Beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium are the constituent elements (Ra).
What other names do alkaline earth metals go by?The alkaline earth oxides, formerly known as beryllia, magnesia, lime, strontium, and baryta, are what give the alkaline earth metals their name. These oxides turn basic when combined with water (alkaline).
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e)
Calcium hydroxide reacts with carbon dioxide to reform calcium carbonate.
Ca(OH)₂ (aq) + CO₂(g) → CaCO3 (s) + H₂O(l)
(i)
Determine the mass, in g, of CaCO3 (s) produced by reacting 2.41 dm³ of
2.33 x 10-2 moldm-3 of Ca(OH)₂ (aq) with 0.750 dm³ of CO₂ (g) at STP.
The mass of Ca CO₃ produced by reacting 2.41 dm³ of 2.33 x 10-2 mol dm-3 of Ca(OH)₂ (aq) with 0.750 dm³ of CO₂ (g) at STP is 30353 g.
What is STP?The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm). The STP value is crucial for many professionals, including physicists, chemists, engineers, pilots, and navigators.
1 dm³ = 1L
2.41 dm³=2.41 L
Moles of Ca(OH)₂ = m M. vol (L)
= 2.33×10⁻²m ×2.41 =5.6153 10⁻²Mol
Moles of CO₂ (n) = [tex]\frac{PV}{RT}[/tex] = [tex]\frac{(1 atm) . (0.75L)}{(0.032).(1atm).(273k)x^{2} k^{-1} ml}[/tex]
Moles of CO₂ (n) = 0.0335 mol
Ca(OH)₂ + CO₂ ⇒ Ca CO₃ + H₂O
[tex]I_{mol}[/tex] 5.6153×10⁻² 0.0335mol 0
C 0.0335mol -0.0335mol 0.0335mol
⇒ 0.022653 0 0.0335mol
Mass of Ca CO₃ = Moles × Molar mass
Mass of Ca CO₃ = 0.0335 mol ×100.0869 g/mol
Mass of Ca CO₃ = 30353 g
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A sample of grape juice has a hydroxide ion concentration of 1.4 × 10-10 M. Is the grape juice more or less acidic than a sample of orange juice that has a hydronium ion concentration of 1.8 × 10-4 M? To compare the acidity of the orange juice and grape juice, compare the hydronium ion concentrations and/or pH values of the two solutions. How does the acidity of a solution vary with hydronium ion concentration and pH?
For the grape juice, we get that the hydroxyl ion concentration is 1.4 ×10-10M.
Hence, pOH will be = -log[1.4*10⁻¹⁰] which is approximately 9.6.
Now the value of pH will be = 14-pOH = 14 - 9.6 = 4.4.
For the orange juice, we know that the H+ or hydronium ion concentration is 1.8 × 10-4 M.
Then, the value of the pH will be= -log[1.8*10⁻⁴]=3.7.
Thus from the above result, it is clear that the range juice has lower pH, hence it will be more acidic. While the grape juice will be less acidic.
The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic. This happens when an acid is introduced. As H+ ions dissociate from the acid and bond with water, they form hydronium ions, thus increasing the hydronium concentration of the solution. If the hydronium concentration decreases, the pH increases, resulting in a solution that is less acidic and more basic. This is caused by the OH^- ions that dissociate from bases
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The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 × 10−5 m2/s and 253,300 J/mol, respectively. At what temperature will the diffusion coefficient have a value of 2.1 × 10−14 m2/s?
The temperature is obtained as 1517 K.
What is the temperature?We know that we asked here to find the temperature at which we are going to have a diffusion coefficient of 2.1 × 10−14 m2/s. Let us look at the following from the question;
D = diffusion coefficient = 2.1 × 10−14 m2/s
[tex]D_{o}[/tex] = pre-exponential constant = 1.1 × 10−5 m2/s
[tex]E_{a}[/tex] = Activation energy = 253,300 J/mol
R = Gas constant = 8.314 J/mol.K
T = temperature = ??
Then;
log D= log [tex]D_{o}[/tex] - Ea/2.303RT
log(2.1 × 10−14) = log( 1.1 × 10−5) - 253,300/2.303 * 8.314 * T
log(2.1 × 10−14) / log( 1.1 × 10−5) = - 253,300/2.303 * 8.314 * T
T = - 253,300/-8.719 * 2.303 * 8.314
T= 1517 K
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23. When wood burns, only a small amount of ashes are made. We know that matter cannot be created or
destroyed. Explain why the mass of the wood before the fire does not equal the mass of the ashes after the
reaction.
for each
The mass of wood before burning does not always equal the mass of the resulting ashes after burning because some other products have been produced and lost.
Burning of woodWhen wood burns, a form of chemical change takes place and the reaction is reversible.
The products of wood burning include ashes, carbon dioxide, and water vapor. However, only ashes remain after burning because carbon dioxide and water vapor both escape into the atmosphere.
The escape of some of the products of burning into the atmosphere is one of the reasons the reaction seems to negate the law of conservation of mass.
According to the law of conservation of mass, masses are conserved during reactions but can be converted to different forms. Thus, if ashes were to be the only product of the burning of wood, then the mass of the ashes formed must be equivalent to the mass of the wood.
However, due to the formation of other products that happen to always escape into the air, the mass of ashes is not always equal to the mass of the woods that burn.
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How do scientists predict how much of a product can be formed?
The way that scientists predict how much of a product can be formed is through the use of Stoichiometry.
What is Stoichiometry?The quantitative examination of the constituents of a chemical process is known as chemical stoichiometry. The Greek words "stoikhein" (which means element) and "metron" (which means measure) are the roots of the English word "stoichiometry."
Stoichiometry describes the correlation between the amounts of reactants and products before to, during, and after chemical processes.
Therefore, the quantity of the generated good is predicted by stoichiometry. To calculate how many S'more "reactants," for instance, we employed stoichiometry.
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The diagram shows the characteristics of two different components of scientific knowledge.
Component C
Component D
Risa
suggested
explanation
of a single
phenomenon
or few related
phenomena
It is testable.
It provides
a unifying
explanation for
a vast set of
phenomena
natural world
Which statement explains which component is likely to be more powerful in explaining a scientific phenomenon? (4 points)
Component C, because a theory is often based on possibility and not certainty.
Component D, because a hypothesis is often based on possibility and not certainty.
Component C, because the ability to explain several occurences in the natural world is a characteristic of a hypothesis
Component D, because the ability to explain several occurences in the natural world is a characteristic of a theory
The statement that explains which component is likely to be more powerful in explaining a scientific phenomenon is:
Component D, because the ability to explain several occurrences in the natural world is a characteristic of a theory; option DWhat constitutes scientific knowledge?Scientific knowledge refers to the body of knowledge that is obtained by the scientific method.
The scientific method refers to a series of steps that scientists follow in their discovery and explanation of natural phenomena.
The scientific method is as follows:
observationasking questionsgiving a hypothesisconducting experimentsanalyzing the results of the experimentsrepeated experiments drawing conclusions and propounding a theory based on the results of the experiments.Hence, scientific knowledge must explain universal occurrences ad must be testable.
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How much heat is required to melt 39.4 g of ice at (0 ∘C )? The heat of fusion for water is 6.02 kJ/mol .
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 13.12KJ of heat is required to melt 39.4 g of ice at (0 ∘C ).
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
q = n ×ΔH
where
q = amount of heat= ?
n = no of moles
ΔH = enthalpy ( 6.02 kJ/ mol)
n = w / M.M
w = given mass =39.4g
M.M = molar mass ( molar mass of water)=18g/mol
n =39.4/ 18
=2.18
Substituting all the given values, we get
q = n ×ΔH
= 2.18 ×6.02
= 12.401 kJ
=13.12KJ
Therefore, 13.12KJ of heat is required to melt 39.4 g of ice at (0 ∘C ).
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The bond enthalpy of F2(g) is 156.9 kJ/mol. Calculate ΔH o f for F(g).
The bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.
What is bond enthalpy?Bond enthalpy is defined as the amount of energy needed to dissolve one mole of a certain type of bond between two gaseous atoms. In general, the amount of energy acquired or lost during a reaction is comparable to the process's change in enthalpy.
Given the bond enthalpy of F2 = 156.9 kJ/ mole
The ΔH can be calculated as
ΔH = bond enthalpy of F2 / 2
ΔH = 156.9 kJ/mole / 2
ΔH = 78.5 kJ/mole
Thus, the bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.
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What is the name of the compound with the chemical formula PbBr4
The compound with the chemical formula PbBr₄ is called lead(IV) bromide.
Lead(IV) bromide is an inorganic compound composed of the elements lead (Pb) and bromine (Br). The compound is named based on the oxidation state of lead, which is +4 in this case.
In naming compounds, the Roman numeral in parentheses after the element name indicates the oxidation state of the metal. In the case of lead(IV) bromide, the Roman numeral IV indicates that lead is in the +4 oxidation state. This means that lead has lost four electrons to achieve a stable configuration.
The name "lead(IV) bromide" accurately represents the composition and oxidation state of the compound. It is worth noting that lead(IV) bromide is a relatively unstable compound and is not commonly encountered in practical applications.
Hence, the name of the compound is lead(IV) bromide.
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20. (01.08 MC)
Alchemy is a branch of ancient knowledge that states that all matter is composed of air, fire, earth, ar
Which of these best explains whether alchemy is a science or pseudoscience? (4 points)
It is a science because all matter is known to be made of elements.
it is a science because air, fire, earth, and water all are forms of matter.
It is pseudoscience because all matter is known to be made of atoms.
It is pseudoscience because ancient knowledge is mystical yet reliable.
It is pseudoscience because each metal is known to be a unique element alchemy is a science or pseudoscience.
What is a matter in chemistry?Matter is anything that occupies space and has mass; in other respects, matter is the "thing" that the cosmos is made of. The fundamental constituents of all stuff are called elements. These are not changed into other elements by conventional chemical processes and have distinct chemical and physical properties.
What does matter consist of?Matter can be solid, liquid, or gaseous on Earth. Solid particles, fluids, and gases are supported by the exceptionally small building components known as atoms and molecules. A solid's component particles are attracted to one another strongly. They are close to one another and vibrate en position without passing each other.
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The complete question is -
Alchemy is a branch of ancient knowledge that states that all matter is composed of air, fire, earth. Which of these best explains whether alchemy is a science or pseudoscience?
A-It is a science because all matter is known to be made of elements.
B-It is a science because air, fire, earth, and water all are forms of matter.
C-It is pseudoscience because all matter is known to be made of atoms.
D-It is pseudoscience because ancient knowledge is mystical yet reliable.
E-It is pseudoscience because each metal is known to be a unique element.