Unit 2

Question 1

The color of ink is a_

Answer 1

B- physical property

Unit 2 Concept 2 page 8

Question 2

Three examples of physical changes are

Answer 2

Burning of gasoline, rotting an egg, and exploding fireworks

Unit 2 concept 2
Page 10

Question 3

In a solution, the substance that is being dissolved is the

Answer 3

Solute

Unit 2 Concept 2
Page 11

Question 4

A flask containing molecules of a gas A and a separate flask containing molecules of gas B are both at the same temperature p. Gases A and B must have equal

Answer 4

Average kinetic energies

Unit 2 Concept 3
Page 26

Question 5

Which term best describes when particles escape from the surface of a liquid and becoming gaseous?

Answer 5

Evaporation

Unit 2 Concept 3
Page 28

Question 6

Milk, paint, and Mayo are all examples of

Answer 6

Heterogeneous mixtures
Unit 2 Concept 1
Page 3

Question 7

The particles in a liquid are usually

Answer 7

Closer together and lower in energy than in a gas
Unit 2 Concept 4
Page 32

Question 8

Using the data table to the right, determine the identity of a cube of metal that measures 1.2 cm on each side and has a mass of 18.15 grams.

Answer 8

Silver
Unit 2 Concept 2
Page 9

Question 9

The Law of Conservation of Mass states

Answer 9

Mass is not lost or created during a chemical change
Unit 2 Concept 2
Page 11

Question 10

Flammability of a substance

Answer 10

Chemical property
Unit 2 Concept 2
Page 10

Question 11

Boiling water

Answer 11

Physical change
Unit 2 Concept 2
Page 10

Question 12

Density of an object

Answer 12

Physical Property
Unit 2 Concpet 2
Page 8

Question 13

Rusting of fishing pole

Answer 13

Chemical change
Unit 2 Concept 2
Page 10

Question 14

In term of saturated, how would you classify a KBr solution with a concentration of 90 g and 100 g of water at 10 Celsius

Answer 14

Supersaturated
Unit 2 Concept 4
Page 32

Question 15

Name 2 places you can find plasma

Answer 15

Stars and neon lights

Unit 2 Concept 3
Page 27

Question 16

Bose- Einstein condensates are used to simulate conditions in a

Answer 16

Black Hole

Unit 2 Concept 3
Page 27

Question 17

Iron and oxygen react to form rust. What will happen to the mass of the rust compared to the mass of the iron and oxygen before the reaction? Explain why this will occur.

Answer 17

Same because Law of Conservation of mass says matter cannot be created or destroyed, even in a chemical change

Unit 2 Concept 2
Page 11

Question 18

List the three points in the kinetic-molecular theory.

Answer 18

All matter is made of particles
Particles collide with each other and the container they are in
All particles are in constant random motion

Unit 2 Concept 3
Page 26

Question 19

List and explain the three factors that increase the solubility rate of a substance

Answer 19

Solute size- rate because more surface area
Temperature- rate because more ke particles collide more
Stirring- rate because it brings fresh solvent in contact with solute

Unit 2 Concept 4
Page 33

Question 20

Name on similarity between compounds and homogeneous mixtures and one difference.

Answer 20

Similarity= both involve 1 element
Difference= compound is chemically combined mixture is physical

Unit 2 Concept 1
Page 3

Question 21

Explain how salt dissolves in water

Answer 21

H+ of water attract Cl-
O-2 of water attract Na+
Water surrounds each ion and continues until all ions are separated

Unit 2 Concept 4
Page 33