A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

Some of the particles escaped as a gas formed.

The heat caused the chemical to become less dense.

The reaction gave off more heat than was added.

Some of the lighter particles were destroyed.

A student measures the mass of an iron nail to be 25 grams. The student heats the nail over a bunsen burner and measures the mass of the nail afterwards. The mass of the nail is found to be greater after burning. Which of the following best explains the increase in mass of the nail?

Extra particles from the air were added to the nail during burning.

The heat caused the compound to become more dense.

The reaction gave off less heat than was added.

Some of the heavier particles multiplied inside the nail.

1. Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most exothermic ?

D. temperature rises by 5 $$\degree C$$

A. temperature rises by 3 $$\degree C$$

B. temperature falls by 5 $$\degree C$$

C. temperature falls by 3 $$\degree C$$

what is the definition of physical change?

changes affecting the form of a chemical substance, but not its chemical identity.

any change that results in the formation of new chemical substances.

any property that is measurable, whose value describes a state of a physical system

What is a chemical change?

When two chemicals react with one another to form a new substance

How two chemicals react with one another when combined

A property that we can measure or observe with our 5 senses or other tools

When a change occurs but it does not result in the formation of a new substance

A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?

The water's TEMPERATURE changed

The powder DISSOLVED in the water

The water turned the COLOR yellow

When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?

Physical change: state of matter

The law of conservation of mass states

atoms cannot be created or destroyed

chemical reactions create new atoms

reactants vanish once a reaction takes place

products appear when a reaction takes place

Chemistry Network Review

Authored by Kimberly Hinkey

Science

8th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

10 sec • 5 pts

Element

Compound

Mixture

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

10 sec • 5 pts

Element

Compound

Mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

10 sec • 5 pts

This diagram represents a _____.

pure substance that is a compound

mixture of elements

pure substance that is an element

mixture of compounds

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

10 sec • 5 pts

What type of change is this?

Chemical

Melting

Evaporation

Condensation

Sublimation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

10 sec • 5 pts

Mixture or Pure Substance?

Mixture

Pure Substance

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

20 sec • 5 pts

If reaction starts with 20g of reactants it should produce

a total of 40g of products

a total of 10g of products

a total of 80 g of products

a total of 20g of products

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

20 sec • 5 pts

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

Tags

NGSS.MS-PS1-5

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Chemistry Network Review

This diagram represents a _____.

What type of change is this?

Mixture or Pure Substance?

If reaction starts with 20g of reactants it should produce

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

A student measures the mass of an iron nail to be 25 grams. The student heats the nail over a bunsen burner and measures the mass of the nail afterwards. The mass of the nail is found to be greater after burning. Which of the following best explains the increase in mass of the nail?

Frying an egg is an example of

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