Exothermic & Endothermic Reactions

Which of the following is not a way carbon dioxide returns to the atmosphere?

• decaying of organisms

• photosynthesis

• emissions by factories

• cellular respiration

Tags

NGSS.HS-ESS2-6

NGSS.HS-LS2-5

Which of the following best explains the relationship between photosynthesis and cellular respiration?

• Photosynthesis produces the light energy necessary for performing cellular respiration.

• Cellular respiration uses the glucose produced by photosynthesis to make energy.

• Cellular respiration uses the glucose produced by photosynthesis to make glucose as a source of food.

• Photosynthesis produces the energy necessary for performing cellular respiration.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Living systems obey the law of conservation of matter. Which of the following supports the main ideas of the law of conservation of matter?

• The substances that take part in a chemical reaction are the same as the substances that are formed by the reaction.

• The masses of the substances that take part in a chemical reaction are less than the masses of the substances that are formed.

• The masses of the substances that take part in a chemical reaction are equal to the masses of the substances that are formed.

• The masses of the substances that take part in a chemical reaction are greater than the masses of the substances formed by the reaction.

Tags

NGSS.HS-PS1-7

During photosynthesis, what gas do plants release?

• oxygen

• methane

• nitrogen

• carbon dioxide

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting

• percent

• stoichiometry

• actual

• predicted

When reacting Na with Cl₂, we calculated that the predicted yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

• 90.4%

• 96.2%

• 104%

• 1.04%

Tags

NGSS.HS-PS1-7

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%

• 82.1%

• 121.8%

• 16.9%

Tags

NGSS.HS-PS1-7

The theoretical yield of a reaction is 237 grams, but the reaction actually yields 26 less grams than expected. What is the percent yield?

• 17.6%

• 89.0%

• 82.4%

• 121.3%

Tags

NGSS.HS-PS1-7

Which of the following reactions has the lowest percent yield?

• Predicted yield 25.7g, actual yield 23.2g

• Predicted yield 18.2g; actual yield 15.6g

• Predicted yield 42.1g; actual yield 39.9g

• Predicted yield 93.4g; actual yield 102.3g

What are the reactants of photosynthesis?

• glucose and oxygen

• sunlight, oxygen, and water

• sunlight, carbon dioxide, and water

• glucose and carbon dioxide

Tags

NGSS.MS-LS1-6