How is the nitrogen cycle important to humans?

It converts nitrogen into a form that humans can obtain by eating other organisms.

It produces free nitrogen that humans can breathe.

It converts nitrogen into a form that humans can obtain by absorbing it through their skin.

It produces nitrogen compounds that humans can breathe.

Cleo has a vegetable garden and wants to increase the amount of nitrogen in the soil.How can she most likely do this?

add several soybean plants to her garden

harvest the vegetable plants continuously

reduce the number of decomposers that live in the soil

decrease the amount of fertilizers she uses

Some bacteria live in the roots of plants like soybeans and peas. What is the role of these bacteria in the nitrogen cycle?

to convert free nitrogen into usable nitrogen

to break down nitrogen-containing compounds in dead organisms

to absorb nitrogen-containing compounds from the soil

to release free nitrogen into the atmosphere

In a science lab, Cash mixes two clear liquids together in a beaker. Bubbles are produced, and a white solid forms and settles to the bottom. He plans to heat the beaker over low heat and make more observations.Which statement is most likely correct?

A chemical change occurred, so even if Cash heats it, the white solid will remain.

A physical change occurred, so even if Cash heats it, the white solid will remain.

A chemical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.

A physical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.

A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the substance?

xexposing it to a flame to see if it catches on fire

heating it to find the temperature at which it melts

placing it in water to find out whether or not it dissolves

hitting it with a hammer to determine if it breaks or bends

Which best describes a role of animals in the water cycle?

They release water vapor when they exhale.

They release water vapor through transpiration.

They help water vapor condense when they inhale.

They help water vapor condense when they produce waste.

Which human activity would most likely decrease the amount of carbon in the atmosphere?

planting a field of wild flowers

Unit 6 4,5,6

Authored by David McBride

Chemistry, Biology

8th Grade

Used 30+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement best describes what happens during a chemical change?

The chemical properties of a substance change, but its physical properties remain the same.

ome properties of a substance change, but its identity remains the same.

he physical properties of a substance change, but its chemical properties remain the same.

Both the identity and the properties of a substance change.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

If the substance is a liquid or solid, production of an odor would indicate a chemical change.

If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.

If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.

If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which event always involves a chemical change?

conducting

burning

boiling

melting

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement best describes a physical change?

Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.

hanges can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.

Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.

Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which laboratory activities involve chemical changes? Check all that apply.

boiling saltwater for several minutes until only solid salt remains

leaving a copper penny in vinegar until it turns green

crushing a rock with a hammer to extract mineral deposits

extracting iron filings from a sand mixture using a magnet

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After Gerry mows his lawn, he often puts the grass clippings into his flower garden.How will this affect his garden?

It will increase the amount of carbon in the soil and increase the amount of carbon dioxide released by decomposers.

It will decrease the amount of carbon in the soil and decrease the amount of carbon dioxide released by decomposers.

It will increase the amount of carbon in the soil and decrease the amount of carbon dioxide released by decomposers.

It will decrease the amount of carbon in the soil and increase the amount of carbon dioxide released by decomposers.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which characteristic of a substance is considered a chemical property?

its conductivity

its density

its reactivity

its boiling point

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Unit 6 4,5,6

Which statement best describes what happens during a chemical change?

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

Which event always involves a chemical change?

Which statement best describes a physical change?

Which laboratory activities involve chemical changes? Check all that apply.

After Gerry mows his lawn, he often puts the grass clippings into his flower garden.How will this affect his garden?

Which characteristic of a substance is considered a chemical property?

How is the nitrogen cycle important to humans?

Cleo has a vegetable garden and wants to increase the amount of nitrogen in the soil.How can she most likely do this?

Some bacteria live in the roots of plants like soybeans and peas.What is the role of these bacteria in the nitrogen cycle?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Some bacteria live in the roots of plants like soybeans and peas.
What is the role of these bacteria in the nitrogen cycle?