Chemistry Unit 2 Review

Question 1

An unknown liquid has multiple bp's and can be distilled into two liquids. Which is true?

Accepted Answer

The unknown liquid was a mixture of two liquids.

Question 2

Which separation technique is best used to separate ink components?

Accepted Answer

Chromatography

Question 3

Koolaid is a homogeneous mixture. Which is true?

Accepted Answer

The mixture is a solution

Question 4

What is true about the contents of the container?

Accepted Answer

It is a mixture of two elements and two compounds.

Question 5

Which of the following could be considered an element and a molecule?

Accepted Answer

O2

Question 6

An unknown pure substance weighs 8g at 4 mL. Which is most likely the identity?

Accepted Answer

NaOH

Question 7

492.716 x 9.2 = 4,532.9872 This answer

Accepted Answer

Should be rounded to 4500

Question 8

What type of change does the following picture represent?

Accepted Answer

Physical

Question 9

What is true about the contents of the container?

Accepted Answer

It is a mixture of one compound and one element.

Question 10

Which is true of a mixture?

Accepted Answer

The composition of a mixture can vary from sample to sample

Question 11

Which of the following is a mixture?

Accepted Answer

Salt water

Question 12

What type of change does the following picture represent?

Accepted Answer

Chemical

Question 13

What is true about the contents of the container?

Accepted Answer

It is a compound.

Question 14

What type of change does the following picture represent?

Accepted Answer

Chemical

Question 15

What is true about the contents of the container?

Accepted Answer

It is a mixture of two compounds.

Question 16

Which is an example of a chemical change?

Accepted Answer

Fuel burns in an engine

Question 17

What is true about the contents of the container?

Accepted Answer

It is a compound.

Question 18

Which of the following is a solution (homogeneous mixture)?

Accepted Answer

Salt Water

Question 19

What is true about the contents of the container?

Accepted Answer

It is a mixture of two elements

Question 20

Which of the following is an example of a compound?

Accepted Answer

Water

Question 21

In which number are ALL of the zeros significant?

Accepted Answer

40.000

Question 22

Which is an example of a physical change?

Accepted Answer

Water is boiled on a stove

Question 23

In which case is the given number correctly rounded to 2 significant digits?

Accepted Answer

0.02000 to 0.020

Question 24

A cup of salt is added to water and thoroughly mixed. What describes the resulting substance?

Accepted Answer

Homogeneous mixture, formed by a physical change

Question 25

A solid has a mass of 20.0g and takes up a volume of 10 mL. What is the density of the solid?

Accepted Answer

2 g/mL

Question 26

What type of change does the following picture represent?

Accepted Answer

Chemical

Question 27

Which of the following is an element?

Accepted Answer

Hydrogen gas

Question 28

What is true about the contents of the container?

Accepted Answer

It is an element.

Chemistry Unit 2 Review

Questions 28

Chemistry Unit 2 Review

Questions 28