Quiz about Unit 2 (23/24)

Question 1

A student wants to dissolve salt into water. Which selection below would increase the rate of dissolution?

Accepted Answer

Place the beaker on a hot plate.

Answer

Remove solvent.

Answer

Add an ice cube to the solution.

Answer

Add additional solvent.

Question 2

A student wants to dissolve salt into water. Which selection below would increase the rate of dissolution?

Accepted Answer

Increase the rate at which the solution is stirred.

Answer

Place the beaker in ice.

Answer

Add an ice cube to the solution.

Answer

Add additional solvent.

Question 3

How many atoms, in total, are in this chemical formula?

Accepted Answer

10

Answer

4

Answer

8

Answer

12

Question 4

Which of the following represents a single atom?

Accepted Answer

Mg

Answer

H2

Answer

CO

Answer

2K

Question 5

Which of the following statements accurately describe the chemical formula?

Accepted Answer

There are 3 elements in this chemical formula.

Answer

There are 4 elements in this chemical formula.

Answer

There are 3 total atoms in this formula.

Answer

There are 6 total atoms in this formula.

Question 6

Which of the following statements accurately describe the chemical formula?

Accepted Answer

There are 5 total atoms in this formula.

Answer

There are 5 elements in this chemical formula.

Answer

There are 4 elements in this chemical formula.

Answer

There are 3 total atoms in this formula.

Question 7

How many total atoms are there in this compound?

Accepted Answer

10

Answer

3

Answer

5

Answer

8

Question 8

How many of each element are present in the chemical formula C₆H₁₂O₆

Accepted Answer

C = 6

H = 12

O = 6

Answer

C = 6

H = 3

O = 6

Answer

C = 12

H = 6

O = 6

Answer

C = 6

H = 6

O = 12

Question 9

Elements are pure substances made of only _____ type of matter. Compounds are made of______ type of matter.

Accepted Answer

one; more than one

Answer

more than one; one

Answer

mixtures; solutions

Answer

gas; solid

Question 10

Co is a/an _________ and CO is a/an ___________.

Accepted Answer

element; compound

Answer

element; element

Answer

compound; element

Answer

compound; compound

Question 11

The instructions for a lab warned students to not put Na in the liquid used during the experiment. What element should not be placed in the liquid?

Accepted Answer

sodium

Answer

nitrogen

Answer

neon

Answer

magnesium

Question 12

A student conducted an experiment in class in which she used 50 mL of a blue liquid and 50 mL of a yellow liquid. After combining the two liquids, she recorded her observations in the table. Which observations prove that a chemical reaction took place?

Accepted Answer

2 and 5

Answer

1 and 2

Answer

3 and 5

Answer

all of these

Question 13

A ______ change takes place when two or more substances combine and a new substance forms.

Accepted Answer

chemical

Answer

physical

Answer

elemental

Answer

homogeneous

Question 14

A __________ change happens when two or more substances combine and no new substance is formed.

Accepted Answer

physical

Answer

chemical

Answer

homogeneous

Answer

elemental

Question 15

Which of the following diagrams illustrates a compound?

Accepted Answer

Question 16

Chewing your food is a ________ change, but when your food turns into another substance, that is a _______ change.

Accepted Answer

physical; chemical

Answer

chemical; physical

Answer

homogenous; heterogeneous

Answer

heterogeneous; homogeneous

Question 17

A homogeneous mixture in which the most abundant (largest) component is water best describes a(n):

Accepted Answer

aqueous solution

Answer

heterogeneous mixture

Answer

solute

Answer

solvent

Question 18

Which of the following would help sugar dissolve more quickly into the water?

Accepted Answer

Swirl the mixture around

Answer

Add additional solvent

Answer

Remove the solute

Answer

Freeze the mixture

Question 19

What gets dissolved in a solution?

Accepted Answer

solute

Answer

solvent

Answer

compounds

Answer

elements

Question 20

Look at the diagram. In this diagram, the red dots represent:

Accepted Answer

solute

Answer

solvent

Answer

solution

Question 21

When additional water is added after a solute has been dissolved in an aqueous solution, you are:

Accepted Answer

diluting the solution

Answer

increasing the concentration

Answer

agitating the solution

Answer

removing solvent

Question 22

The removal of solvent increases the

___________ of the solute in the solution.

Accepted Answer

concentration

Answer

dilution

Answer

mixture

Answer

solvent

Question 23

Which of the following is NOT a factor that affects the rate of dissolution?

Accepted Answer

increase pressure

Answer

agitation

Answer

increase temperature

Answer

increase urface area of solute

Question 24

True or False? A diluted solution has less solute compared to the solvent.

Accepted Answer

true

Answer

false

Question 25

A(n) ______________ is a homogenous mixture throughout which two or more substances are uniformly dispersed. In other words, it is a type of solution in which the most abundant component is water.

Accepted Answer

aqueous solution

Answer

compound mixture

Answer

gaseous solution

Answer

solid solution

Question 26

________ is the stirring or physical manipulation of a substance that will break bonds and allow for new chemical interactions.

Accepted Answer

Agitation

Answer

Combustion

Answer

Pressure

Answer

Surface area

Question 27

How fast a substance dissolves:

Accepted Answer

rate of dissolution

Answer

agitation

Answer

chemical change

Answer

physical change

Question 28

Which would increase the rate of dissolution of sugar in tea?

Accepted Answer

Smaller crystals increase the surface area and speed up dissolving.

Answer

Smaller crystals increase the surface area and slow down dissolving.

Answer

Lowering the temperature increases the energy of the molecules

Answer

Increasing the temperature decreases the energy of the molecules

Question 29

A rotting apple is an example of a _______ change

Accepted Answer

chemical

Answer

physical

Question 30

Burning a candle is an example of a _______ change

Accepted Answer

chemical

Answer

physical

Question 31

Painting a car is an example of a _______ change

Accepted Answer

physical

Answer

chemical

Question 32

Cutting paper is an example of a _______ change

Accepted Answer

physical

Answer

chemical

Unit 2 (23/24)

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science