Unit 1 Test

Question 1

Measuring: How many digits do you measure?

Answer 1

You give one more digit than is shown.

Question 2

what point of liquid do you take as the measurement in a graduated cylinder?

Answer 2

the lowest point (meniscus)

Question 3

What is Precision?

Answer 3

Its consistency. If the same object is measured multiple times, a precise instrument will give similar results each time.

Question 4

What is accuracy

Answer 4

How close the instrument, on average, gets to the true value of the object.

Question 5

What type of phase change is Melting?

Answer 5

solid to liquid

Question 6

What type of phase change is Freezing?

Answer 6

liquid to solid

Question 7

What type of phase change is Boiling?

Answer 7

liquid to gas

Question 8

What type of phase change is Condensation?

Answer 8

gas to liquid

Question 9

What type of phase change is Sublimation?

Answer 9

solid to gas

Question 10

What type of phase change is Deposition?

Answer 10

gas to solid

Question 11

What is the change from solid to liquid called?

Answer 11

melting

Question 12

What is the change from liquid to solid called?

Answer 12

freezing

Question 13

What is the change from liquid to gas called?

Answer 13

boiling

Question 14

What is the change from gas to liquid called?

Answer 14

condensation

Question 15

What is the change from solid to gas called?

Answer 15

sublimation

Question 16

What is the change from gas to solid called?

Answer 16

deposition

Question 17

Why do phase changes occur?

Answer 17

usually due to heating or cooling

Question 18

What are the three phases (states) of matter?

Answer 18

Solid, Liquid, Gas

Question 19

What are the particles like in a solid?

Answer 19

They have a rigid structure and definite shape. Particles are locked in place and are closely packed together making it the most dense state of matter.

Question 20

What are the particles like in a liquid?

Answer 20

Don’t have a rigid structure. Particles move freely past each other Liquid will take the shape of the container its in. Particles are close together so liquids are dense but not compressable.

Question 21

What are the particles like in a Gas?

Answer 21

No rigid structure and also take shape of container. particles spread out to fill the container. they occupy the volume of what they are given. Low density, Compressible

Question 22

What is a chemical change?

Answer 22

One where a substance is destroyed and another is created. Chemical bonds are broken and/or formed. Irriversible

Question 23

What is a physical change?

Answer 23

A change in which no new molecules are made. no chemical bonds are broken or formed. Reversible

Question 24

Chemical equations

Answer 24

Count how many of each then write: Substance then number below and to the side
ex H204f3 number would go below

Question 25

What are the 2 categories of matter?

Answer 25

Pure substances and Mixtures

Question 26

what are the 2 types of pure substances?

Answer 26

Element and Compound

Question 27

What is the difference between an atomic element and a molecular element?

Answer 27

Atomic: Element made up of atoms
Molecular: Element made of molecules

Question 28

What is a homogenous mixture?

Answer 28

Atoms are scattered and uneven

Question 29

What is a heterogenous mixture?

Answer 29

atoms are separated. could be clumps or sides

Question 30

What is a mixture?

Answer 30

A mix of different types of atoms

Question 31

What is a compound?

Answer 31

2 different atoms connected by a bond

Question 32

What is a Kilo (meter, gram, liter)

Answer 32

x1000

Question 33

What is a Centi (meter, gram, liter)

Answer 33

x0.01 hundredths place

Question 34

what is a Milli (meter, gram, liter)

Answer 34

x0.001 Thousandths place

Question 35

What are the indications a chemical change is occurring?

Answer 35

Gives off light
bubbles
Change in temp
absorbs heat
creates a new substance