Sand has a lower heat capacity hence it heats up easily and looses heat easily. On the other hand, water has a higher heat capacity and looses heat more slowly hence it remains warm at night.
What is heat transfer?The transfer of heat refers to the movement of heat from one body to another. We should note that sand has a low specific heat capacity hence it is rapidly heated up in the day and looses heat quickly at night.
On the other hand, water has a high specific heat capacity hence it heat up slowly and also does not loose heat easily even when the surrounding temperature is much colder. As such, there is an extreme temperature difference between day and night in a desert during clear weather and the water in a swimming pool in the desert tends to remain warm even when the outside temperature drops greatly at night.
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How are Dams good and Bad for the environment?
Help!!
Answer:
Dams can stop a place from flooding and give us electricity without creating pollution. It can also make a place dry and finish water for animals
Explanation:
SCIENCE help pls need kna
I answered your question in the photo sent
Good luch
What property did mendeleev use to organize the periodic table.
Answer:
Atomic weight.
Explanation:
Hope this helps you!
Explain how sulfur forms its ion.
Explanation:
the sulfur ato is in group 6 of the periodic table. In order to become an ion the ato needs to gain 2 electrons so it has a full outer shell of electron and is stable. so the atom S goes to S2+ + 2e
how many atoms of HCl are needed to produce 0.62 moles of hydrogen gas
Answer:
0.2 moles
Explanation:
The equation is given by;
2HCl => H² + Cl²
According to stoichiometry;
[tex] \frac{n \: hcl}{2} = \frac{n \: h {}^{2} }{1} [/tex]
[tex]nhcl = 2 \times nh {}^{2} [/tex]
To produce 0.62 moles of H² gas we need,
nHCL=2×0.62=1.24 moles
Using the relation;
number of moles:Number of atoms/Avogadro's constant
We can then say;
N(numb. of atoms)=n×Na
Number of atoms=1.24×6.02×10²³
Number of atoms=7.5852×10²³ atoms
What is the molarity of 20g of KNO, in 250 mL of water?
Answer:
should be 2M
Explanation:
:)
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Answer:
Electronic configuration of nitrogen: K=2 L=5
Electronic configuration of phosphorus : K = 2 L = 8 M = 5
The element nitrogen will be more electronegative because of the smaller size of its atom. nitrogen accepts electrons more easily.
Explanation:
Explanation:
The atomic number of nitrogen is 7 , so its electronic configuration will be 2 , 5The atomic number of phosphorus is 15 , so its electronic configuration is 2 , 8, 5Nitrogen is more electronegative than phosphorus.
Reason :-
From top to bottom down a group, electronegativity decreases.
Explanation :-
Number of shell increases down a group, so there is an increased distance b/w the valence electrons and nucleus, or a greater atomic radius.
Since nitrogen has a smaller atomic radius than phosphorus, the attraction of its nucleus towards the incoming electron is more than phosphorus. So , because of smaller atomic size nitrogen accepts electrons more easily.
Calculate the Gibbs energy, entropy, and enthalpy of mixing when 1.00mol C6H14 (hexane) is mixed with 1.00mol C7H16 (heptane) at 298K. Treat the solution as ideal.
With Hexane of 1.00 ml and 1.00 ml of hectane at 298, the calculated
Gibbs energy = 3.43Entropy = -3.43Enthalpy = 0How to solve for the Gibbs energyC6H14 = C6H14/C6H14+C7H16
1mol/1mol+1mol = 1/2 = 0.5 mol
1+1 x 8.3145J x 298 x 0.5ln0.5 + 0.5ln0.5
= 4955.442 0.6932
= 3435J
convert to KJ
G mix = 3.43
The Gibbs energy is therefore 3.43KJ/mol
The entropy of the solution-(1+1 x 8.3145J x 298 x 0.5ln0.5 + 0.5ln0.5)
S mix = -3.43 KJ/mol
3.43/298 = 11.5
The enthalpy of the solution
3.43-3.43 KJ/mol
H mix = 0
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Convert 18◦C to Kelvin.
291.15 Kelvin
I hope this helps
Answer:
18 degrees Celsius = 291.15 Kelvin
Explanation:
The formula for finding Kelvin through Celsius is by adding 273.15 to the Celsius. In this case, it is 18 + 273.15 = 291.15
:)
What is equation for photosynthesis
Answer: The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.
hope this helps!
Answer:
6CO2 + 6H2O → C6H12O6 + 6O2
Explanation:
By titration, 13.5 mL of aqueous H2SO4 neutralized 21.8 mL of 0.0419 M LiOH solution. What was the molarity of the aqueous acid solution?
13.5 mL of 0.0339 M H₂SO₄ is titrated with 21.8 mL of 0.0419 M LiOH.
What is titration?Titration is a process of chemical analysis in which the quantity of some constituent of a sample is determined by adding to the measured sample an exactly known quantity of another substance with which the desired constituent reacts in a definite, known proportion.
Step 1: Write the balanced equation.H₂SO₄ + 2 LiOH ⇒ Li₂SO₄ + 2 H₂O
Step 2: Calculate the reacting moles of LiOH.0.0218 L × 0.0419 mol/L = 0.000913 mol
Step 3: Calculate the reacting moles of H₂SO₄.The molar ratio of H₂SO₄ to LiOH is 2:1.
0.000913 mol LiOH × (1 mol H₂SO₄/2 mol LiOH) = 0.000457 mol H₂SO₄
Step 4: Calculate the molarity of H₂SO₄.[H₂SO₄] = 0.000457 mol/0.0135 L= 0.0339 M
13.5 mL of 0.0339 M H₂SO₄ is titrated with 21.8 mL of 0.0419 M LiOH.
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what describes the equivalence point on a graph of pH versus the amount of titrant added to a solution
Answer:
Titrant and analyte is a pair of acid and base. ... Equivalence point: point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution. At the equivalence point in an acid-base titration, moles of base = moles of acid and the solution only contains salt and water.
Explanation:
1. Describe the liquid state according to the
kinetic-molecular theory.
Answer:
Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces. These forces keep particles close together.
Explanation:
hope it helps U
The specific heat capacity of iron 0. 45 j/gk. Find the molar heat capacity for iron
Answer:
The final temperature of the sample is 21.004 °C
Explanation:
The molar heat capacity for iron is 25.130 J/g.c joules per gram per Kelvin.
What is molar heat capacity?The amount of heat needed to increase one temperature of one mole of a substance is called molar heat capacity.
By the formula [tex]\rm \Delta T^\circ c = \Delta Tk[/tex]
Given that c = 0.45 J/g.C
Molar mass of iron is 55.845
Then putting the values in the equation
[tex]c= 0.45 \times 55.845 \\\\c= 25.130 \;J/g.^\circ c[/tex]
Thus, the molar heat capacity for iron is 25.130 J/g.c
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Would the ph at the equivalence point be acidic, basic, or neutral for each given titration?.
The pH at equivalence point depends on the nature of the acid-base titration, and can either be acidic, basic, or neutral.
What is equivalence point?The equivalence point in a titration is the point at which equal amount of acid and base have reacted with each other.
The pH at equivalence point depends on the nature of the acids and bases being titrated.
pH at equivalence point will be:
neutral in a strong acid and strong base titrationacidic in a strong acid and weak base titration basic in a weak acid and strong base titrationTherefore, the pH at equivalence point depends on the nature of the acid-base titration.
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Write balanced equations and expressions for ksp for the dissolution of each of the following ionic compounds. Write a balanced equation for the dissolution of baso4
Based on the dissolution equation of BaSO4, the solubility product, Ksp, expression of BaSO4 is: [Ba^{2+}] × [SO4^{2-}]
What is solubility product Ksp of a solute?The solubility product, Ksp, of a substance is an equilibrium constant which expresses the product of the concentration of ions produced by a solute.
The solubility of a solute depends on temperature, thus solubility product also depends on temperature.
The balanced equation for the dissolution of barium sulfate is given below:
BaSO4 ⇌ Ba^{2+} + SO4^{2-}The solubility product for barium sulfate is given as;
Ksp = [Ba^{2+}] × [SO4^{2-}]
Therefore, the solubility product, Ksp, expression of BaSO4 is: [Ba^{2+}] × [SO4^{2-}]
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An ice cube is placed on the counter, as seen below. Draw an arrow to show the direction of heat transfer to or from the ice/water. Explain your answer.
Answer:
The arrow would be facing upwards from the counter to the icecube.
Explanation:
Heat flows from the counter to the ice causing the molecules in the counter to move more slowly.
An ice cube is placed on the counter, The arrow would be facing upwards from the counter to the ice cube. This is the property of water.
what are the properties of water molecule ?It is tasteless, odorless, or transparent, nucleus of the oxygen atom and the electrons strongly than the nuclei of the hydrogen atoms.
In water molecule oxygen is electro negative than hydrogen, results in the development of a partial negative charge on the oxygen and a partial positive charge on the hydrogen end.
Water have a strong cohesive property where the attraction of molecules with other molecules of the same kind is referred to as cohesion.
Surface tension of the water is defined as the tendency of the surface to resist rupture when they are subjected to stress due to cohesive forces.
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Do the halogens tend to gain or lose electrons in chemical reactions? how many?
Explanation:
Halogens tend to gain one electron so that they can get a full outer level and be stable.
476 nm = [? ]10
cm
give your answer in scientific notation.
1nm=10^-6 cm.
476 nm = 4.76E-5 cm
What is the molarity of a solution in which 25g NaCl in a 2.00 L solution?
Mass of sodium :- 23 grams
Mass of Chlorine :- 35.5 grams
Mass of NaCl :- 58.5 grams
mass given :- 25 grams
moles :- 0.432 ( given mass/ ionic mass)
[tex]molarity = \frac{moles}{vol} \\ molarity = \frac{0.432}{2} \\ molarity = 0.216 \: mole{l}^{ - 1} or \: molar[/tex]
A student has a sample of isopropanol (C3H7OH) that has a mass of 78. 6 g. The molar mass of isopropanol is 60. 1 g/mol. How many moles of isopropanol are contained in this sample? 0. 765 moles 1. 31 moles 78. 6 moles 4,720 moles.
Mole is the ratio of the mass to the molar mass of the substance and its unit is mol. The moles of isopropanol in the sample are 1. 31 moles.
What are moles?Moles are the unit of measurement of the smallest entity of atoms, molecules, and compounds.
Given,
Mass of isopropanol (m) = 78. 6 g
Molar mass of isopropanol = 60. 1 g/mol
Moles of isopropanol is calculated as:
[tex]\begin{aligned} \rm moles (n) &= \rm \dfrac{mass}{molar \; mass}\\\\&= \dfrac{78.6}{60.1}\\\\&= 1.31\;\rm moles\end{aligned}[/tex]
Therefore, moles of isopropanol are option b. 1.31 moles.
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If 550 mL of a 3.50 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 275 mL, what will the molarity of the solution be?
Answer:
Explanation:
Molarity = number of moles / volume
If 550 mL of a 3.50 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 275 mL, which is half of 550 mL, the molarity of the solution with the same number of moles of KCl is 3.5 * 2 = 7.00 M
The molarity of the solution will be 7 M.
What is molarity ?The total count of moles of solute per liter of a particular solution is known as a solution's molarity.
What is solution?The volume of just an object is a measurement of how much space it takes up.
Molarity of the solution can be determined by the formula:
[tex]M_{1} V_{1} = M_{2} V_{2}[/tex]
where, M = molarity of solution. V = volume.
Given data:
[tex]M_{1}[/tex] = 3.50 M
[tex]M_{2}[/tex] = ?
[tex]V_{1}[/tex] = 550 mL
[tex]V_{2}[/tex] = 275 mL
Now, put the value of given data in molarity equation.
[tex]V_{2} = M_{1} V_{1} /M_{2}\\V_{2} = (3.50 M) (550 mL) / (275 mL)\\V_{2} = 7 M[/tex]
Therefore, the molarity of the solution will be 7 M.
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Some bacteria live in the roots of plants like soybeans and peas.
Bacteria growing on plant roots.
What is the role of these bacteria in the nitrogen cycle?
to absorb nitrogen-containing compounds from the soil
to release free nitrogen into the atmosphere
to break down nitrogen-containing compounds in dead organisms
to convert free nitrogen into usable nitrogen
70 points!
Answer:
to release free nitrogen into the atmosphere. This is the answer.
Answer:
to convert free nitrogen into usable nitrogen
Explanation:
got it right on the test boi
Marble(calcium carbonate) reacts with hydrochloric acid(hcl) to form calcium chloride solution, water, and carbon dioxide. Find the percent yield of carbon dioxide if 3. 65 grams
Answer:
When calcium carbonate reacts with hydrogen chloride, it reacts to form calcium chloride, carbon dioxide, and water. If this reaction occurs with 51.6% yield, what mass of carbon dioxide will be collected if 16.93 g of CaCO3 is added to sufficient hydrogen chloride
Given what you observe at the molecular/atomic level, why would surface area have this effect?
Answer:
Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate. Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.
Explanation:
:)
Which of these form electrolytic solutions with water?
Multiple answers.
A) Sodium Chloride (NaCl)
B) Glucose (C6H12O6)
C) Hydrochloric acid (HCl)
D) Carbon Dioxide (CO2)
Answer:
I believe is the correct answer
Explanation:
a
Which is a disadvantage of using chemical indicators? they are expensive to use. they measure ph directly. they must be selected for a narrow ph range. they do not use electricity to operate.
Chemical indicators are the chemical reagents that show the change in reaction by changing color. Chemical indicators must be chosen with a narrow pH range.
What are indicators?Indicators are the solutions or the substances used for the qualitative and the quantitative measurement by a change in color because of the absence or the presence of the sample concentration.
The chemical indicators cannot detect the exact pH and should be used with a narrow range of pH.
Therefore, option C. the narrow range of pH is the disadvantage of chemical indicators.
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Answer:
C (They must be selected for a narrow ph range.
Explanation:
Edg 2022
chinua reacts 37g of magnesium with 150g of sulfuric acid. what will be the total mass of the products of this reaction
the total mass is 187g. The total mass of the reactant is always equal to total mass of the products.
explanation:
as per the given details, the reactant involved in the reaction are 37g of magnesium and 150g of sulfuric acid . the total of the reactant is 187g.
Carbon is the main constituent of hydrocarbons. Why some are called unsaturated hydrocarbon? Briefly describe.
Some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.
What are hydrocarbons?Hydrocarbons are any organic compounds that contain hydrogen and carbon in its structure.
Hydrocarbons can be grouped into the following based on whether they contain single or double bonds:
Saturated hydrocarbons - contain only single bonds e.g. alkanesUnsaturated hydrocarbons - contain double and triple bonds e.g. alkenesTherefore, it can be said that some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.
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What are the answers for The brainPOP digestive systems 1-10
Answer:
Q.
Why do we need to break apart the food we eat?
answer choices
so it can fit in our stomachs
so our bodies can use the nutrients from the food
so liquids can be separated from solids
so that our enzymes have something to do
2nd option
Where does digestion begin?
answer choices
mouth
stomach
large intestine
small intestine
first option
Q.
Chewing is an example of what kind of digestion?
answer choices
dental
fragmentary
chemical
mechanical
last option
If you wanted to find the glands that produce salivary amylase, where would you look?
answer choices
mouth
throat
intestines
stomach
first option
Place in order:
A. food enters large intestine
B. food enters small intestine
C. food enters esophagus
answer choices
A B C
C B A
C A B
B A C
2nd option
Hydrochloric acid can burn your skin yet it exists in your stomach. How can this be?
answer choices
small intestines absorb the acid
stomach lining protects you against burns
food in stomach absorbs the acid
the acid in your stomach is different from the acid in a chemistry lab
2nd option
What is chyme?
answer choices
a type of digestive enzyme
what food is called after it has been digested by the stomach
a chemically active part of the small intestine
a passage that leads from small to large intestine
2nd option
Q.
What might happen if you had your pancreas removed?
answer choices
your intestines might have trouble breaking down food
your stomach might have trouble producing hydrochloric acid
you would not be able to chew properly
you would have trouble producing saliva
first option
Q.
What is the main function of villi?
answer choices
to move food from the stomach to the small intestine
to absorb nutrients into the bloodstream
to absorb water from chyme
to move food from small intestine to large intestine
2nd option
Q.
What might happen if your large intestine did not absorb water from chyme?
answer choices
you couldn't digest food
you wouldn't be able to go to the bathroom
you'd become dehydrated
solid waste wouldn't be moved to the rectum
3rd option
Explanation:
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