Quiz about Compounds & Chemical Reactions #21

Question 1

What is evidence that a chemical reaction has occured?

Accepted Answer

a new gas is observed in the form of bubble

Answer

Shredding paper

Answer

Blue & Red paint mixing to make purple paint

Answer

a phase change occurs

Question 2

Peyton & Michael take two clear liquids and mix them together. When observing the final product, you notice a yellow solid has formed. What is the term for the solid that is formed as a result of a chemical change?

Accepted Answer

precipitate

Answer

condensate

Answer

evaporate

Answer

sublimate

Question 3

Julia & Jillian were enjoying the fireworks when they got into a chemistry argument. Julia insisted that the fireworks were the result of a chemical reaction. Jillian disagreed. What would you tell them to solve this argument?

Accepted Answer

The color changes and the release of energy indicate a chemical reaction.

Answer

It is a change of state, solid to gas, due to the addition of energy.

Answer

It was a physical reaction since the fuse was lit and heat was produced.

Answer

It is an endothermic reaction because energy was added.

Question 4

Evidence of a chemical change does NOT include

Accepted Answer

change in shape.

Answer

producing a gas.

Answer

change in color.

Answer

change in temperature.

Question 5

A compound is a pure substance composed of two or more elements, combined by chemical means, in a definite ratio. Which container represents a chemical compound? Hint: An elements chemical symbol only contains ONE uppercase letter.

Accepted Answer

H2O

Answer

Cl

Answer

Na

Answer

N2

Question 6

Which model represents the chemical formula NO_2,nitrogen dioxide?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 7

Boiling Water (select the correct answer)

Accepted Answer

Physical Change

Answer

Chemical Change

Question 8

What evidence(s) of a chemical reaction do you see in the pictures? (Select all that are correct)

Accepted Answer

Precipitate

Accepted Answer

Color Change

Answer

Gas

Answer

Giving off light

Question 9

What evidence of a chemical reaction do you see in the picture?

Accepted Answer

bubbling (bubbles)

Answer

color change

Answer

precipitate

Answer

heat

Question 10

Which of the following are evidence(s) of a chemical change that you see in the picture? (Select all that are correct.)

Accepted Answer

giving off light

Accepted Answer

temperature change

Answer

wood

Answer

camping

Question 11

A solid is formed when two liquids (or solutions) are mixed together. Select the correct vocabulary word that goes with this definition.

Accepted Answer

precipitate

Answer

cloud

Answer

vinegar

Answer

heat

Question 12

Production of Gas or Bubbles is evidence of a

Accepted Answer

Chemical Change

Answer

Physical Change

Question 13

How many atoms does this chemical formula have?

Accepted Answer

2

Answer

4

Answer

3

Answer

1

Question 14

How many elements create chocolate?

Accepted Answer

4

Answer

3

Answer

22

Answer

21

Question 15

How many elements are represented in this chemical formula for sodium bicarbonate (Baking Soda): NaHCO₃?

Accepted Answer

4

Answer

5

Answer

2

Answer

1

Question 16

How many atoms in a molecule of water? H₂O

Accepted Answer

3

Answer

4

Answer

2

Answer

1

Question 17

A subscript is

Accepted Answer

the number of atoms that each element has in a chemical formula.

Answer

at the pharmacy.

Answer

the number of molecules.

Answer

a compound.

Question 18

Kaida was assigned the task of making a model volcano. To make her volcano erupt, Claudia mixed baking soda and vinegar. When these two substances came in contact with one another they produced bubbles and fizzed making it look like the volcano was erupting. After "erupting" her volcano Claudia's teacher told her that she had created a chemical reaction inside of the volcano. What evidence did Claudia see of a chemical reaction?

Accepted Answer

gas production

Answer

change in color

Answer

change in odor

Answer

light production

Question 19

Burning a candle is a chemical change. What is the primary evidence that burning the candle is a chemical reaction?

Accepted Answer

temperature change

Answer

change in color

Answer

change in odor

Answer

formation of a solid

Question 20

Christopher decided to mix some vinegar with baking soda. He knew that a reaction occurred because he made careful observations. He noted that the mixture started to foam up and bubble and was white in color. How did Josh know that a chemical reaction occurred? He was sure a reaction occurred because of

Accepted Answer

the formation of gas.

Answer

the color of a mixture

Answer

the volume of the mixture

Answer

the smell of the vinegar

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science