CHEMISTRY HIGH SCHOOL

A reaction that releases energy is called endothermic .


True or False

Answers

Answer 1
Answer:

Answer: False

Explanation: Endothermic means it absorbs heat energy.

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At the end of 2012, global population was about 7.0 billion people. What mass of glucose in kg would be needed to provide 1200 cal/person/day of nourishment to the global population for one year? Assume that glucose is metabolized entirely to CO₂(g) and H₂O(l) according to the following thermo-chemical equation: C₆H₁₂O₆(s)+6O₂(g)⟶6CO₂(g)+6H₂O(l); ΔH₀ = −2803kJ

Answers

Final answer:

To calculate the mass of glucose needed to provide nourishment to the global population for one year, multiply the daily energy requirement by the total number of days and the global population. Convert the energy to mass using the thermo-chemical equation.

Explanation:

To calculate the mass of glucose needed to provide 1200 cal/person/day of nourishment to the global population for one year, we need to determine the total energy required for one year and then convert it to mass using the thermo-chemical equation. First, calculate the total energy required by multiplying 1200 cal/person/day by the total number of days in a year and the global population. Next, convert the energy to kilojoules. Finally, use the energy change given in the thermo-chemical equation to convert the energy to mass of glucose.

  1. Calculate the total energy required: 1200 cal/person/day x 365 days/year x 7.0 billion people.
  2. Convert energy to kilojoules: Total energy in cal x 4.184 J/cal x 10^-3 kJ/J.
  3. Convert energy to mass of glucose: Energy in kJ / energy change in kJ (ΔH₀) in the thermo-chemical equation.

The final result will give you the mass of glucose needed in kilograms.

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Which of the following is a biogeochemical cycle?a. Atmospheric cycle
b. Iconic cycle
c. Neonic cycle
d. Water cycle

Answers

Biogeochemical cycles are cycles that involve biological, geological and chemical processes. It is a pathway by which a chemical substance moves through the biotic and abiotic compartments of the Earth. Among the options, the one which is a biogeochemical cycle is letter "D. Water cycle" 

Water has one of the highest specific heat capacities.
True
False

Answers

True and it actually has the highest of any liquid

The answer is true. Water does have one the highest specific heat capacities.

What is the formula for calcium iodine

Answers

Calcium has a charge of 2+ and iodine has a charge of 1-. Use the criss cross method and criss cross the charges and write them as subscripts. The formula is CaI2.
The formula for this would be Cal2

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Are temperature and heat physical or chemical properties?

Answers

It is a chemical property

What is locked up carbon dioxide

Answers

Basically it means carbon dioxide is removed from the atmosphere and is trapped in e.g. calcium carbonate (like shells), rocks, oceans etc. 
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