When water freezes, the attractions between water molecules weaken and the crystal lattice breaks apart.
What is water molecules?Water molecules are the molecules which make up water. A water molecule consists of two hydrogen atoms bonded to a single oxygen atom, with the chemical formula H2O. The strong covalent bonds between the hydrogen and oxygen atoms give water many of its unique properties, such as its ability to dissolve many substances, its high surface tension, and its ability to absorb and release large amounts of heat energy.
As the temperature drops, the water molecules slow down and move closer together, forming a crystalline structure. As the temperature continues to decrease, the attractions between water molecules hold them in place in a crystal lattice, and all molecular motion stops.
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How does sunscreen work?(1 point) Responses .
It helps prevent the skin from absorbing UV waves.
It helps UV waves be able to pass through the skin
It helps UV waves be able to pass through the air.
It helps prevent the skin from reflecting UV waves.
Inorganic chemicals in sunscreen can reflect or scatter the light away from the skin, and organic (carbon-based) ones can absorb UV rays
Answer:
It helps prevent the skin from absorbing UV waves.
Explanation:
A sample of brass released 2,690 J into some water. The initial and final temperature of the water are 21.0 °C and 42.0 °C, respectively. What is the mass of the water?
The mass of the water can be obtained as 31 g.
What is the mass of the water?
I would want us to have the first law of thermodynamics at the back of our minds. I said this because the energy that have been lost by the brass is the energy that the water is going to have to gain and this is the first law of thermodynamics.
Thus we have;
H = mcdT
m = mass of the water
c = Specific heat capacity of water
dT = temperature change
Then we have;
2690 = m * 4.18 * (42 - 21)
m = 2690/4.18 * (42 - 21)
m = 31 g
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Cyclopropane rearranges to form propene in the gas phase. The reaction is first order in cyclopropane and has a measured rate constant of k=3. 36×10^−5 s^−1 k=3. 36×10^−5 s^−1 at 720 K. If the initial cyclopropane concentration is 0. 0445 MM, what will the cyclopropane concentration be after 235. 0 min? Express the molarity to three significant figures
2.8×10−2 M will the cyclopropane concentration be after 235. 0 min.
The cycloalkane cyclopropane has the chemical formula (CH2)3, and it is made up of three methylene groups (CH2) that are joined together to create a ring. The structure experiences significant ring strain as a result of the ring's modest size.
[tex]k=3.36*{10^{-5}}{s^{-1}}\\\\K=\frac {2.303 }{t} log \frac{a}{a-x}\\\\3.36*{10^{-5}}=\frac {2.303 }{235min} log \frac{0.445}{a-x}\\\\\\3.36*{10^{-5}}=\frac {2.303 }{235*60} log \frac{0.445}{a-x}\\\\\\20.571*{10^{-2}}=log \frac{0.445}{a-x}\\\\\\1.58=\frac{0.445}{a-x}\\\\\\(a-x)=0.281\\\\(a-x)=2.8*{10^{-2}}M[/tex]
This meant that the quick and painless induction of anaesthesia using cyclopropane and oxygen was possible Ralph Waters, an American anaesthetist, developed cyclopropane and put it to use in medicine. To save this then-expensive substance, he devised a closed system with carbon dioxide absorption. With a blood/gas partition value of 0.55 and a minimum alveolar concentration of 17.5%, cyclopropane is a reasonably strong, non-irritating, and sweet-smelling substance. .8×10−2 M will the cyclopropane concentration be after 235. 0 min.
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What number of ATP is produced when a molecule of glucose undergoes fermentation?
A. 4
B. 36
C. 2
D. 38
C. 2 ATP. At the cellular level, energy is used and stored as adenosine triphosphate (ATP). Adenine, ribose, and three serially bound phosphate groups make up.
the structure of ATP, which is a nucleoside triphosphate. An organic substance called adenosine triphosphate provides energy for a variety of biological functions in living cells, including muscular contraction, nerve impulse transmission, condensate dissolving, and chemical synthesis. The main molecule for storing and transmitting energy in cells is adenosine 5'-triphosphate (ATP). At the cellular level, energy is used and stored as adenosine triphosphate (ATP). Adenine, ribose, and three serially bound phosphate groups make up. It is frequently referred to as the cell's energy currency and is like the money that is kept in a bank.provides energy for a variety of biological functions in living cells, including muscular contraction, nerve impulse transmission,
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What do you notice about all of the ionic charges for group 12 group 2 group 15 group 16 group 17
Answer: The elements in Groups 2,15,16 and 17 of the Periodic Table are called alkali metals. They form ionic compounds when they react with non-metals. Their ions have a single positive charge. For example, sodium forms sodium ions, Na+
Explanation:
hope you understood
A tiny crystal of table salt (NaCl) contains 950. billion formula units of salt. What is the mass of this crystal, in grams? Chemical Formula: Work: Calculated answer: Molar mass: # sig figs: Final answer with units:
Answer:
29 ouns
Explanation:
it has 950 billion so it will be scaled in grams not kilograms
1. How many atoms of oxygen are present in 0. 04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10. 5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
0.12 atoms of oxygen are present in 0. 04 mole NaNO3, 2. 0.097 moles of nitrogen atoms are present in 10. 5g of N2O5, 3. 0.127 atoms of oxygen are present in 50g of Fe(H20)2(S04)3
To find the number of atoms of oxygen present in 0.04 mole NaNO3, you can use the mole ratio from the chemical formula. The formula for NaNO3 is NaNO3, which means that for every 1 mole of NaNO3, there are 3 moles of oxygen atoms. Therefore, 0.04 mole of NaNO3 contains 0.04 mole x 3 atoms/mole = 0.12 atoms of oxygen.
To find the number of moles of nitrogen atoms present in 10.5 g of N2O5, you can use the molar mass and the molar ratio from the chemical formula. The molar mass of N2O5 is 108 g/mol, and the formula for N2O5 is N2O5, which means that for every 1 mole of N2O5, there are 2 moles of nitrogen atoms. Therefore, 10.5 g of N2O5 contains 10.5 g / 108 g/mol = 0.097 moles of nitrogen atoms.
To find the number of atoms of oxygen present in 50 g of Fe(H2O)2(SO4)3, you can use the molar mass and the molar ratio from the chemical formula. The molar mass of Fe(H2O)2(SO4)3 is 392.18 g/mol, and the formula for Fe(H2O)2(SO4)3 is Fe2(SO4)3.6H2O, which means that for every 1 mole of Fe(H2O)2(SO4)3, there are 6 moles of oxygen atoms. Therefore, 50 g of Fe(H2O)2(SO4)3 contains 50 g / 392.18 g/mol = 0.127 moles of oxygen atoms
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Oxidation-Reduction and balancing through ion electron method. Answer choices on bottom. Can someone explain this problem how they got their answer? I having a hard time understanding oxidation and reduction reactions
The balanced equation of the redox reaction using the ion-electron method is:
3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂O
The correct option is D.
What is a redox reaction?Redox reactions include a change in the oxidation state of the substrate. When oxidation occurs, electrons are lost, or the oxidation state increases. When a reduction occurs, electrons are gained or the oxidation state decreases.
The balanced equation of the redox reaction using the ion-electron method is given below as follows:
Hg + HNO₃ → Hg(NO₃)₂ + NO + H₂O
Hg⁰ is oxidized to Hg²⁺ by the loss of two electrons
N⁵⁺ is reduced to N²⁺ by a gain of three electrons
To balance electron loss, we add a coefficient of 3 in from of Hg and a coefficient of 8 in front of HNO₃
3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂O
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Gather data: experiment with a variety of initial partial pressure of no, no2, and n2o3. For each set of initial partial pressures, use the gizmo to determine the equilibrium partial pressures of each gas. Run three trials for each set of initial conditions. Use the data you collect to fill in the first four columns of the table. (note that some no2 molecules combine to form n2o4, so there may be less free no2 than no) I don’t quite understand what it’s asking, so some clarification would be nice
The task is asking you to conduct experiments to determine the equilibrium concentrations of the gases NO, NO2, and N2O3 .
Specifically, you are to vary the initial partial pressures (or concentrations) of the gases and use a gizmo (presumably some sort of laboratory instrument) to measure the equilibrium partial pressures of each gas. You should conduct three trials for each set of initial conditions and record the data in a table with four columns: the initial partial pressures of NO, NO2, and N2O3 and the equilibrium partial pressures of NO, NO2, and N2O3. It is important to note that some NO2 molecules may combine to form N2O4, so there may be less free NO2 than NO at equilibrium. This experiment is designed to study the equilibrium of the reaction: 2NO(g) + 2NO2(g) <-> 2N2O4(g); The task is asking you to study the effect of the initial concentrations of each reactant on the equilibrium concentrations of each product. The data you collect should be useful in understanding the reaction kinetics and the thermodynamics of the system.
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Which of them is not used as domestic fuel?
a) Petrol
b) CNG
c) PNG
d) LPG
Answer:
correct answer is petrol .
how does thermal energy play a role in the carbon????
PLEASE HELP!!!!!
Answer:
Thermal energy plays a role in the carbon cycle by driving the process of photosynthesis in plants and other organisms. During photosynthesis, plants take in carbon dioxide from the atmosphere and convert it into organic compounds, such as glucose, using the energy from sunlight. This process also releases oxygen back into the atmosphere.
Thermal energy also plays a role in the carbon cycle by driving the process of respiration in plants and animals. During respiration, compounds are broken down to release energy, which is used by the organism. This process also releases carbon dioxide back into the atmosphere.
Explanation:
15. why might doubling the number of moles of hcl decrease the rate of hcl production? select the acid convertase enzyme is converting hcl back into h and cl- select cannot be determined select no more h or cl- exists to be converted select the acid convertase enzyme has become inactive
When doubling the number of the moles of the HCl decrease the rate of HCl production because the acid convertase enzyme is converting HCl back into H⁺ and Cl⁻.
The reaction is as follows :
H⁺ + Cl⁻ ⇄ HCl
If we double the number of the moles of the HCl , it decreases the rate of the HCl production because of the reason that the acid convertase enzyme is converting the HCl back into the H⁺ and Cl⁻. The purpose of the enzyme is to allow the conversion of the reactant to the product and the product back to the reactant
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The table below shows the time and distance of a moving car. What is the average speed of the car for the 10 minutes, expressed in meters per minute? In kilometers per hour? if u can pls put an explanation bc my teacher is rlly strict on that
The average speed of the car would be:
512 meters per minute30.12 km/hWhat is the average speed?The average speed of a moving object is the ratio of the total distance traveled by the object and the total time taken to cover the distance traveled.
The average speed can be mathematically expressed as:
Average speed = total distance/total time
From the graph, the total distance traveled by the car can be estimated as:
4800 + 320 = 5120 m
Total time = 10 minutes
Average speed of the car = 5120/10 = 512 meters per minute
5120 meters = 5120/1000 = 5.12 kilometers
10 minutes = 10/60 = 0.17 hour
Average speed of the car in kilometers per hour = 5.12/0.17 = 30.12 km/h
In other words, the average speed of the moving car in meters per minute is 512, while the speed in kilometers per hour is 30.12.
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State how copper ulfate i different to copper ulfide in term of the element it contain
Copper sulphate has oxygen elements in it while copper sulphide doesn't have.
Copper sulphate is formed by the combination of copper and sulphate ions.The chemical formula of this compound is CuSO4.It is formed by the combination of copper, sulphur and oxygen elements.Copper sulphide is formed by the combination of copper and sulphide ions.The chemical formula for this compound is CuS.It is formed by the combination of atoms of copper, and sulphur.Hence, Copper sulphate has oxygen elements in it while copper sulphide doesn't have.Go through the given link below to know more about copper:-
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A gas balloon has a volume of 732mL when the temperature is 45.0 °C and the pressure is 740.0
mm of mercury.
a) What will its volume be at SATP?
Answer:
The final volume will be 44.69 L
Initial volume V₁ = 106.0 L
Initial pressure P₁ = 740.0 mm of Hg
Initial temperature T₁ = 45.0⁰C
Final pressure P₂ = 780.0 mm of Hg
Final temperature T₂ = 20.0⁰C
It is required to calculate the final volume V₂
a 5.250 mg sample of nicotine, composed entirely of c, h, and n, is combusted, producing 14.242 mg of co2 and 4.083 mg of h2o. what is the empirical formula of nicotine?
The empirical formula of nicotine is C0.96H1N1
The empirical formula of a compound is the simplest whole-number ratio of the atoms in the compound.
To find the empirical formula of nicotine, you need to determine the number of moles of each element present in the sample and then divide by the lowest number of moles.
First, you need to convert the mass of nicotine, CO2, and H2O to moles. To do this, you can use the molar mass of each element:
C = 12.01 g/mol
H = 1.01 g/mol
N = 14.01 g/mol
O = 16.00 g/mol
5.250 mg of nicotine is equal to:
[tex]\frac{ 5.250 mg}{(12.01+1.01+14.01)g/mol}[/tex]) = 0.0027 moles
14.242 mg of CO2 is equal to:
[tex]\frac{14.242mg}{(12.01+16.00*2)g/mol}[/tex] = 0.0024 moles
4.083 mg of H2O is equal to:
[tex]\frac{4.083mg}{(1.01*2+16.00)g/mol}[/tex] = 0.0013 moles
Now you need to find the number of moles of each element present in the sample:
C = 0.0027 moles × 1
H = 0.0013 moles × 2
N = 0.0027 moles × 1
And finally, you can divide these values by the lowest number of moles to get the simplest whole-number ratio:
C = [tex]\frac{ 0.0027 moles}{0.0027 moles}[/tex] = 1
H = [tex]\frac{0.0026 moles}{ 0.0027 moles}[/tex] = 0.96
N = [tex]\frac{ 0.0027 moles}{0.0027 moles}[/tex] = 1
The empirical formula of nicotine is C0.96H1N1
It's important to note that the empirical formula represents the simplest ratio of atoms in a molecule but doesn't necessarily represent the actual molecular formula which could have more atoms or a different arrangement of atoms.
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why is it important to tap the side of the eudiometer tube before reading the volume of gas collected
It is important to tap the side of the eudiometer tube before reading the volume of gas collected because it helps to settle any bubbles that may be present in the gas sample.
Bubbles can form in the gas sample during the collection process, for example due to temperature or pressure changes, and can cause inaccuracies in the measurement of the volume of gas. If bubbles are present when the volume of gas is measured, it can lead to overestimation of the volume of gas collected. By tapping the side of the eudiometer tube, the bubbles will rise to the top and can be removed by opening the tube or by releasing the pressure. This will ensure that the volume of gas measured is an accurate representation of the amount of gas that was collected, and not affected by the presence of bubbles. This is important for obtaining precise and accurate results in experiments that use eudiometer tubes.
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Use the amounts of each product and reactant
listed below to balance the equations for the
reaction between sodium chloride and fluorine.
NaCl + F2 NaF + Cl₂
NaCl = 29.25g F₂ = 9.5g NaF = 21g Cl₂ = 17.75g
As a diatomic molecule, fluorine is represented by (F2). The following balanced chemical equation illustrates how sodium metal and fluorine gas combine to generate sodium fluoride.
F2(g) = 2Na(s) + 2NaF (s).
The symbolic representation of a chemical reaction is a chemical equation. To ensure that the amount of atoms in the reactants and products are equal, a chemical equation must be balanced.
Prior to conducting the synthesis, the chemical equation between the reacting species must be balanced because doing so will enable the reactant to be taken in stiochiometric proportions. The law of conservation of mass is truly satisfied when a chemical reaction is balanced.
A poorly stated or imbalanced chemical equation will undoubtedly have an impact on the synthesis. There are times when the product won't form, and side products will form in its place.
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A sample of hydrogen has a volume of 12 L under a pressure of 3 atm. What will the pressure of this gas be if the volume were decreased to 6 L?
The pressure of the gas if the volume were decreased to 6L is 6 atm.
How to calculate pressure?Boyle's law of ideal gases states that the pressure of an ideal gas is inversely proportional to its volume at constant temperature.
The Boyle's law equation is given as follows;
P₁V₁ = P₂V₂
Where;
P₁ = initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
3 × 12 = 6 × P
36 = 6P
P = 6atm
Therefore, the pressure of the hydrogen gas is 6 atm.
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every 18.02 g of water contains 6.022 x 1023 water molecules. each molecule contains three atoms. how many atoms are there in 500.0 g (about a quart) of water?
The every 18.02 g of the water contains 6.022 x 10²³ water molecules. For the each molecule contains the three atoms. The number of atoms are there in 500.0 g of water is 5 × 10²⁵ atoms.
The mass of water = 18.02 g
The number of molecules of water = 6.022 x 10²³ molecules
The number of atoms are there in 500.0 g of water is as follows :
The number of atoms in 500 g of water :
= (500 g water × 6.022 x 10²³ molecules / 18.02 water) × 3 atoms / 1 molecules
= 5 × 10²⁵ atoms
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The initial concentration of [PCl3], [Cl2] and [PCl5] in a reaction vessel are 0.485M, 0.261M, and 0.399M respectively. KC= 0.500. calculate the equilibrium concentration of [cl2].
Answer:C12: 0.487 m
Explanation:
Explain how a chemical reaction between molecules of baking soda and molecules of citric acid could have produced some new water molecules?
The way a chemical reaction between baking soda and citric acid can produce new water molecules is that they can react together to produce new compounds, including water.
How can baking soda and citric acid react ?When baking soda and citric acid are mixed together in water, they undergo a chemical reaction known as a neutralization reaction. In this type of reaction, an acid (citric acid) reacts with a base (baking soda) to form a salt (sodium citrate) and water.
In the case of baking soda and citric acid, the reaction is exothermic, meaning that it releases heat. This heat can cause the water molecules to move faster, leading to the formation of bubbles of carbon dioxide gas, which is the fizzing you observe when baking soda and citric acid are mixed together.
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a physical change is : a. souring of milk b. burning of gasoline c. rusting of iron d. fermentation of sugar forming alcohol e. condensation of steam
Physical changes occur in dairy products when water is simply evaporated from milk (powdered milk and sweetened condensed milk).
What is physical change?
A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.A change in which a substance undergoes a change in its physical properties is called a physical change. A physical change is generally reversible. In such a change no new substance is formed.Physical change is a type of change where the physical properties of matter change. A change of state of matter, change in colour, odour, solubility, etc. all are examples of physical change. During a physical change, neither the composition nor the chemical nature of matter is changed.To learn more about physical change refers to;
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The percentage of oxygen in air is 21%.
The mass of air in a classroom was 220Kg
Calculate the mass of oxygen in the classroom
The mass of oxygen in the room would be 46.2 kg.
The mass of a component as a percentage of the mass of the substance itself is known as the percent composition. Mathematically, this is expressed as:
Mass of component/mass of material multiplied by 100% gives the percent composition.
The percentage of oxygen in the air in this instance is represented as 21%, while the total mass of air in the classroom is provided as 220 kg. This formula can be used to determine how much oxygen is present in the classroom:
% oxygen composition = mass of oxygen/mass of air
Making the oxygen mass the focus of the formula:
Mass of air x percent oxygen content equals mass of oxygen
Let's replace the values now:
Weight of oxygen = 21% times 220
= 0.21 x 220
= 46.2 kg
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Three magnesium isotopes have atomic masses and relative abundances of 23.995 amu (78.99%), 24.986 amu (10.00%), and 25.992 (11.01%). Calculate the average atomic mass of magnesium.
i’ll give brainliest
You would multiple the percentages times the atomic mass and then add each of them together.
Ex. (23.995)(.7899)+(24.986)(.10)+(25.992)(.1101). = 24.3139 amu
when alkaline earth metal reaects with iodine it makes a white solid. what characteristics of the solid
The white solid formed when an alkaline earth metal reacts with iodine is an ionic compound.
The white solid formed when an alkaline earth metal reacts with iodine is an ionic compound. This compound is composed of polyatomic anions and cations in an ionic lattice, which gives it its solid form. The cations come from the alkaline earth metals, which are group two elements on the periodic table, and the anions come from the iodine, which is a halogen. The compound is typically composed of a ratio of 1:1 or 2:1, depending on the metals in reaction. The compound is usually insoluble in water and can be used in various applications. It is often used for its chemical inertness, which makes it ideal for processes that involve corrosive or reactive materials.
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One mole of tungsten (6 × 1023 atoms) has a mass of 184 grams, and its density is 19. 3 grams per cubic centimeter, so the center-to-center distance between atoms is 2. 51 × 10-10 m. You have a long thin bar of tungsten, 2. 6 m long, with a square cross section, 0. 07 cm on a side. You hang the rod vertically and attach a 98 kg mass to the bottom, and you observe that the bar becomes 1. 42 cm longer. From these measurements, it is possible to determine the stiffness of one interatomic bond in tungsten. 1) What is the spring stiffness of the entire wire, considered as a single macroscopic (large scale), very stiff spring?
The wire is 91826.77 N/m stiff, One layer of a cross section contains 1.0158e13 atoms, Number of bonds per unit length = 9.96e9, rigidity = 9.035 e-9 N/m
a) The force acting on the bar is given by (F) = mg = 119 * 9.8 = 1166.2 N.
The wire's extension (L) is 1.27 cm, or 0.0127.
Therefore, stiffness of wire = F/L = 1166.2 / 0.0127.
The wire is 91826.77 N/m stiff.
b) The ratio of the number of atoms in one cross-sectional layer to 8e-4 (2.51e-10)2
One layer of a cross section contains 1.0158e13 atoms.
c) The length's bond count is 2.5 / 2.51e-10.
Number of bonds per unit length = 9.96e9
d) Bond stiffness equals force acting on the bond / bond strain
bond-applied force = 1.152e-20 N
strain is equal to (0.0127/2.5)*2.51e-10 = 1.275e-12 m.
Stiffness is calculated as 1.152e-20 / 1.275e-12.
rigidity = 9.035 e-9 N/m
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an advantage of recycling aluminum rather than disposing of it in landfills is that aluminum can be
Answer:
Recycling aluminium uses 95% less energy than producing aluminium from raw materials like bauxite ore and it conserves energy and reduces air pollution and water pollution as well as reducing green house effects and conserving the natural resources. So the pros of recycling aluminum much out weigh the cons.
California, a city that is far inland, such as Sacramento, is typically warmer than a city near the coast, such as San Francisco agree or disagree
Answer:
correct
Explanation:
I agree that California cities that are farther inland, such as Sacramento, are typically warmer than those that are near the coast, such as San Francisco. This is because the coast has a cooling effect due to the ocean breeze and the proximity to the ocean, which helps to moderate temperatures. Inland areas, on the other hand, are farther from these cooling influences and can experience higher temperatures, especially during the summer months
makes a connection with in chemistry
Knowing how atoms and molecules behave in chemical reactions in chemistry depends on understanding electron transfer processes. The transfer of one or more electrons from one species.
to another occurs in electron transfer reactions, which are closely connected to oxidation-reduction (redox) processes. Atoms' oxidation states change during redox reactions, which are chemical processes. In the process of oxidation, electrons are lost, whereas in the process of reduction, electrons are gained. In a redox reaction, an oxidizing species (the reducing agent) transfers electrons to a species that is being reduced (the oxidizing agent). The term "oxidized" refers to a species that is losing electrons, whereas the term "reduced" refers to a species that is gaining electrons.Several biological activities, including cellular respiration, photosynthesis, and biochemical reactions, depend heavily on electron transfer reactions. They are utilized in a variety of technologies, including electrochemistry, fuel cells, and batteries.
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