Pool water contains chlorine to keep it sanitary
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Answer:
liquid, solid, and gas
Explanation: It depends where the molecules are moving. When a solid the molecules are vibrating and are all together, compact, the molecules are also very slow. When a liquid the molecules are moving back and forth, up and down, and are less compact, but moving faster. When a gas, the molecules move everywhere very quickly, moving super fast.
Calorie (cal) or small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius.
One small calorie is approximately 4.2 joules.
A calorie is a unit of energy.
For example:
Q = 150000 J; released energy.
Convert Jules in calories:
Q = 150000 J ÷ 4.186 J/calorie.
Q = 35833.73 calorie.
The large calorie or nutritional calorie (symbols: Cal, kcal) is the heat energy needed to raise the temperature of one kilogramof water by one degree Celsius.
A nutritional calorie, or kilocalorie, is equal to 1000 calories.
One large calorie is 4.184 kilojoules: 1 Cal = 4.184 kJ.
For example:
E = 2500 Cal; energy burnt.
E = 2500 Cal · 4.184 kJ/Cal.
E = 10460 kJ.
Answer: This description refers to: "hydrogen bonding" .
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<u> Hydrogen bonding </u> is a specific type of "dipole-dipole force" that exists <u /><em><u>between</u> </em> [molecules with hydrogen atoms] <em><u>and</u> </em> [molecules with nitrogen, oxygen, or fluorine atoms.] .
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Answer:
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Explanation:
The balanced chemical reaction to obtain water from SnO₂ is:
The mole ratio is:
Find the number of moles equivalent to 1.20× 10²¹ molecules of water, using Avogadro's number:
From the mole ratio, the number of moles of SnO₂ are half the number of moles of water. That is:
- 0.0019927 moles / 2 = 0.00099635 moles of SnO₂
Use the molar mass of SnO₂ to convert the number of moles to grams:
- molar mass of SnO₂ = 150.71g/mol
- mass of SnO₂ = 0.00099635mol × 150.71 g/mol = 0.150 grams.
The answer must be reported with 3 significant figures.
