Quiz about Amplify Science Chemical Reactions

Question 1

The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, the workers found two substances that melt at higher temperatures in the sealed container. (Nothing had escaped.)

Which of the diagrams shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 2

Andres is a chemist, he mixed two liquid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Andres found two solid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 3

Jacob mixed two samples together: a colorless gas with no smell and a colorless liquid that smells like bleach. He analyzed the results and found two ending substances. One of the ending substances was a green gas. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Jacob mixed together?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 4

Which of the following is a chemical change?

Accepted Answer

Burning wood

Answer

Boiling water

Answer

Dissolving salt in water

Answer

Melting ice

Question 5

Which of the following is a sign that a chemical reaction has taken place?

Accepted Answer

Change in color

Answer

Change in shape

Answer

Change in position

Answer

Change in size

Question 6

In this chemical equation, the elements in red are the_______.

Accepted Answer

Reactants

Answer

Products

Answer

Subscripts

Answer

Coefficients

Question 7

What happens to atoms in a chemical reaction?

Accepted Answer

They are rearranged to form new substances

Answer

They disappear

Answer

They change into new elements

Answer

They remain completely unchanged

Question 8

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

Accepted Answer

Rusting of iron

Answer

Boiling water

Answer

Dissolving salt in water

Answer

Melting ice

Question 9

What is a chemical reaction?

Accepted Answer

A process that changes the chemical composition of substances

Answer

A process that changes the physical form of substances

Answer

A method to dissolve substances in water

Answer

A way to freeze substances instantly

Question 10

A copper penny turning greenish after a few years is an example of ...

Accepted Answer

Chemical Change

Answer

Physical Change

Question 11

Paula works at a paint company and is developing new ingredients to make paint safer to use. She mixed two colorless substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Paula found two yellow substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 12

Devorah is a food chemist, and she is developing a chemical to help foods stay fresh longer. She mixed a red liquid substance and a colorless solid substance together in a sealed container.

The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Devorah found two white substances in the sealed container. (Nothing had escaped.)

Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 13

Samira watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances. Samira was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. She created a model of the repeating groups of atoms that might make up the two ending substances.

Accepted Answer

Samira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is an extra product, that shouldn't be in her model.

Answer

Samira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing reactant.

Answer

Samira's model is correct because the properties are different and the atoms are rearranged.

Answer

Samira's model is incorrect because not all atoms are accounted for

Question 14

A scientist mixed two samples together. She analyzed the results and found two ending substances. One of the ending substances is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples the scientist mixed together?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 15

Tiana is a chemist who is making a chemical to add to swimming pools in order to make the water safer. She mixed two solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Tiana found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 16

Question 16.

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 17

Santiago is a chemist working to make a new kind of antacid, which is a medicine that helps with stomach pain. He mixed two powdery solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Santiago found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 18

Marisol mixed two samples together: a brown liquid with no smell and a colorless gas that smells irritating. She analyzed the results and found two ending substances. One of the ending substances smelled sweet. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Marisol mixed together?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 19

Jamie works at a company that makes cleaning chemicals. She is trying to make a chemical that smells like flowers. She took two samples that were gases at room temperature and mixed them in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Jamie found two substances that smelled like flowers in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 20

Which of the following is a chemical reaction involving the formation of a new substance?

Accepted Answer

Burning a candle

Answer

Mixing sand and salt

Answer

Boiling water

Answer

Melting wax

Question 21

In a chemical reaction, what does the law of conservation of mass state?

Accepted Answer

Mass remains constant

Answer

Mass is lost during the reaction

Answer

Mass is gained during the reaction

Answer

Mass is irrelevant

Question 22

Which of the following observations indicates a chemical reaction has occurred?

Accepted Answer

A gas is produced

Answer

A solid dissolves in a liquid

Answer

A liquid evaporates

Answer

A solid melts

Question 23

What is the role of a catalyst in a chemical reaction?

Accepted Answer

It speeds up the reaction without being consumed

Answer

It increases the temperature

Answer

It decreases the temperature

Answer

It is consumed in the reaction

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