1.4

Which organism uses nitrates from its fresh water habitat as a primary food source?

• Fish

• Algae

• Birds

Tags

NGSS.MS-LS2-1

Which human activity has the most negative impact on water quality?

• Agriculture

• Flushing toilets

• Washing clothes

Tags

NGSS.MS-ESS3-3

How can humans most directlyinfluence what happens in a river basin in a positive way?

• by developing a task force for creating estuaries

• by protecting soil, water, air, plants, and animals

• by promoting public awareness through education

Tags

NGSS.MS-LS2-5

Which best describes a chemical reaction applying the law of conservation of mass?

• An equation which uses energy

• an unbalanced equation in which the reactants and products are unequal

• balanced equation in which the reactants and products are equal

Tags

NGSS.MS-PS1-5

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

• During a chemical reaction, the total amount of matter stays the same.

• During a chemical reaction, matter is destroyed.

• During a chemical reaction, one or

• During a chemical reaction, the total number of atoms increases.

Tags

NGSS.MS-PS1-5

When chemicals react in a closed container, which must be true?

• The mass both before and after the reaction is the same.

• The mass both before and after the reaction is variable.

• The same number of compounds is present both before and after the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction shown occurs.

Hydrogen + Oxygen —> Water + Energy

What happens to the total mass of the contents of the test tube?

• The total mass increases

• The total mass decreases

• The total mass remains the same

• Part of the mass is changed to heat energy.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is true of mass during a chemical reaction?

• Mass increases

• Mass decreases

• Mass stays the same

• Mass depends on the chemicals involved

Tags

NGSS.MS-PS1-5

What is the independent variable on this graph?

• Year

• Number of Visitors

• Visitors to a Park

• none of these

How many people visited the park in 1997?

• 20

• 40

• 60

• 50

• 35