NC Science

How does this reaction support the Law of Conservation of Mass?

• Several molecules of water are produced.

• The mass of carbon atoms is reduced during the reaction.

• The mass of the atoms in the reactant equals the mass of the atoms in the products.

• The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

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Which statement is true about a chemical reaction?

• The physical states of the atoms in the reactants determine the products.

• Some of the atoms in the reactants will be a part of the products.

• The number of atoms in the reactants determines the products.

• All of the atoms in the reactants will be a part of the products.

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NGSS.MS-PS1-5

In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

• The deer population would increase and begin to compete for food.

• The deer population would become larger and healthier animals.

• The deer population would decrease, because there would be an increase in disease.

• The deer population would change color, because they would not have to hide from wolves.

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How are mutualism and parasitism different?

• Both organisms benefit in mutualism, while in parasitism only one organism benefits at the other’s expense.

• Both organisms benefit in parasitism, while in mutualism only one organism benefits at the other’s expense.

• Both organisms benefit in mutualism, while in parasitism one organism benefits, and the other is neither harmed nor benefits.

• Both organisms benefit in parasitism, while in mutualism one organism benefits, and the other is neither harmed nor benefits.

Where do plants get the food they need for energy?

• They absorb it directly from the sun.

• They absorb it directly from the soil.

• They produce it during photosynthesis.

• They receive it from atmospheric gases.

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Which best represents the flow of energy within an aquatic ecosystem?

• algae → insects → fish → turtle → sunlight

• insects → algae → fish → turtle → sunlight

• sunlight → insects → algae → fish → turtle

• sunlight → algae → insects → fish → turtle

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NGSS.MS-LS2-3

Which is most likely a major concern associated with burning fossil fuels?

• Burning fossil fuels can pollute the oceans.

• Burning fossil fuels can remove harmful chemicals from precipitation.

• Burning fossil fuels can remove carbon dioxide from the atmosphere.

• Burning fossil fuels can produce smog, which can cause respiratory illnesses.

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NGSS.MS-ESS3-4

How owuld a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary?

• All organisms would die.

• All organisms would continue to live as they now do.

• The number of salt-tolerant organisms would increase, and the number of salt-intolerant organisms would decrease.

• The number of salt-intolerant organisms would increase, and the number of salt-tolerant organisms would decrease.

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Which best explains why all of the Earth’s freshwater is not available for human use?

• Most of Earth’s freshwater is only in lakes.

• Most of Earth’s freshwater is underground.

• Most of Earth’s freshwater is still in the water cycle.

• Most of Earth’s freshwater is frozen water

If a lake has excess levels of phosphates and nitrates in its water, what will most likely result?

• The temperature of the lake water will decrease.

• The turbidity levels of the lake will decrease.

• The dissolved-oxygen levels in the lake will increase.

• The growth of algae in the lake will increase.

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