Question

1. which of the following is true about the carbon cycle?

a) carbon is stored only in the oceans
b) plants release carbon during photosynthesis
c) carbon does not move between the atmosphere and living organisms
d) animals contribute carbon through respiration

1. which of the following is a human activity that impacts the carbon cycle?

a) planting trees
b) burning fossil fuels
c) recycling water
d) fertilizer use

1. how does deforestation directly affect the carbon cycle?

a) it increases oxygen levels
b) it reduces the amount of carbon dioxide in the atmosphere
c) it increases the amount of carbon dioxide in the atmosphere
d) it has no impact on the carbon cycle

1. on the ph scale, which range indicates an acidic solution?

a) exactly 7
b) above 7
c) below 7
d) between 7-14

1. a substance that feels slippery and tastes bitter is most likely what, based on its properties?

a) a neutral solution
b) an acid
c) a base
d) a metal

1. if you have an unknown liquid that causes a burning sensation and reacts with metals to produce hydrogen gas, what chemical characteristic does it possess?

a) it is a base, useful for cleaning
b) it is a neutral substance
c) it is an acid
d) it is a weak solution

Explanation:

1. Carbon is stored in multiple reservoirs (oceans, atmosphere, biosphere, etc.). Plants absorb carbon during photosynthesis. Carbon moves freely between atmosphere and organisms. Animals release CO₂ via respiration.
2. Burning fossil fuels releases stored carbon into the atmosphere, altering the carbon cycle. Planting trees sequesters carbon, while recycling water and fertilizer use do not directly impact the carbon cycle.
3. Deforestation removes trees that absorb CO₂, and decomposing/ burned trees release stored carbon, increasing atmospheric CO₂.
4. The pH scale defines acidic solutions as having a value below 7, neutral at 7, and basic above 7.
5. Bases have the characteristic properties of feeling slippery and tasting bitter.
6. Acids cause a burning sensation and react with metals to produce hydrogen gas, as defined by chemical properties.

Answer:

1. d) Animals contribute carbon through respiration
2. b) Burning fossil fuels
3. c) It increases the amount of carbon dioxide in the atmosphere
4. c) below 7
5. c) A base
6. c) It is an acid