Which of the following could be used as EVIDENCE that a chemical reaction occured.

Comparing the melting point, solubility, color, hardness, and density of the substances before and after the reaction.

The temperature of the substances before and after the reaction

Comparing the mass or volume before and after the reaction.

The taste of the substances before and after the reaction.

Did a chemical reaction occur in this model of electrolysis?

Yes, the atoms of the reactants rearranged into the new products.

No, the product is the same as the reactants we started with.

What is the evidence in a scientific explanation?

The data the we collected to support our answer to the question.

A statement answering the question being asked.

The scientific principles that tie together the evidence to the claim.

1. A scientist has two containers. Inside each container is a blue liquid. The liquids are pure substances. What can the scientist do to help find out whether these two liquids are both the same substance?

Measure the density of the two liquids and compare the densities.

Weigh each liquid and compare the weights.

Measure the volume of each liquid and compare the volumes.

Measure the temperature of each liquid and compare the temperatures.

2. Which change will produce a new substance?

burning a piece of bread in a toaster

heating water until it evaporates

3. Which of the following is a chemical reaction?

Atoms of the reactants REARRANGE to form a new substance

Additional atoms are formed when substances are mixed together

A solid material melts and becomes a liquid

7. Which of the following is a correct listing of some clues for a chemical change?

They are all signs of a chemical change

gas given off (bubbles/fizzing)

8. Which of the following is an example of a chemical reaction?

The surface of a copper penny turning green after being in a drawer for years

Aluminum foil being cut into smaller pieces

Melted butter becoming a solid when placed in the refrigerator

9. What happens to atoms in a chemical reaction?

c. Existing atoms rearrange to create new substances

a. Some atoms disappear to create new substances

b. Some atoms are made to create new substances

d. Nothing happens to the atoms during a chemical reaction

14. A student mixes two different liquids together. After mixing the liquids, a solid substance forms that cannot be turned back into the starting liquids. The student claims that a chemical reaction occurred. Why is the student correct?

Because a new substance is always formed during a chemical reaction

Because a solid substance is always formed during a chemical reaction

Because a chemical reaction always occurs when two substances are mixed together

Chemistry Assessment #3

7th Grade

•

27 Qs

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Chemistry Assessment #3

Quiz

•

Chemistry

•

7th Grade

•

Practice Problem

•

Medium

Amber Baaso

Used 3+ times

FREE Resource

27 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are properties?

Characteristics that are specific to a certain substance

Things that help distinguish one substance from another

Remain the same regardless of sample size

all of these

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to atoms during a chemical reaction?

Some atoms are destroyed and some remain the same.

They atoms of the reactants are rearranged to form the products.

Stay put and do not rearrange.

New atoms are created.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Iron + Oxygen ----> Iron Oxide
What are the reactants?

Iron Oxide

Iron and Oxygen

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

aluminum + copper chloride ----> copper + aluminum chloride
Name the product(s) in the reaction.
(Scientific Principle #10)

Aluminum and copper chloride

Copper and Aluminum Chloride

Aluminum and Copper

There are no products

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Iron + Oxygen ----> Iron Oxide
What are the products?

Iron and Oxygen

Iron Oxide

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What can we test to determine if two substances are the same or different?

Properties

Mass

Volume

Temperature

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is melting an ice cube a chemical or physical change?

Chemical Change

Physical Change (phase change)

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Chemistry Assessment #3

27 questions

What are properties?

What happens to atoms during a chemical reaction?

Iron + Oxygen ----> Iron Oxide
What are the reactants?

aluminum + copper chloride ----> copper + aluminum chloride
Name the product(s) in the reaction.
(Scientific Principle #10)

Iron + Oxygen ----> Iron Oxide
What are the products?

What can we test to determine if two substances are the same or different?

Is melting an ice cube a chemical or physical change?

Is burning Magnesium a chemical or physical change?

Is making chocolate milk a chemical change or a physical change?

Is it a chemical or physical change when acid rain reacts with copper?

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Chemistry Assessment #3

27 questions

What are properties?

What happens to atoms during a chemical reaction?

Iron + Oxygen ----> Iron OxideWhat are the reactants?

aluminum + copper chloride ----> copper + aluminum chlorideName the product(s) in the reaction.(Scientific Principle #10)

Iron + Oxygen ----> Iron OxideWhat are the products?

What can we test to determine if two substances are the same or different?

Is melting an ice cube a chemical or physical change?

Is burning Magnesium a chemical or physical change?

Is making chocolate milk a chemical change or a physical change?

Is it a chemical or physical change when acid rain reacts with copper?

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Iron + Oxygen ----> Iron Oxide
What are the reactants?

aluminum + copper chloride ----> copper + aluminum chloride
Name the product(s) in the reaction.
(Scientific Principle #10)

Iron + Oxygen ----> Iron Oxide
What are the products?