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Flashcards in Chemistry Unit Test Deck (32)
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1

What happens to water particles when they're frozen?

they expand

2

why do ice cubes float?

because frozen water is less dense than liquid water since it expands

3

Positively charged particles are called

protons

4

the nucleus of an atom contains...

protons and neutrons

5

The smallest particles of an atom are

electrons

6

Molecules are smaller than atoms: True of False?

False

7

Is water a compound? Explain

Yes because it is made up of hydrogen and oxygen

8

Dirt is a pure substance. True of False?

False, it is a mixture

9

The three states of matter are

solid, liquid and gas

10

The two states of matter that have no defined shape are

liquid and gas

11

The state of matter that has molecules farthest apart is...

gas

12

When you cool a gas it becomes a...

liquid

13

when you heat a liquid it becomes a...

gas

14

when you cool a liquid it becomes a

solid

15

when you heat a solid it becomes a

liquid

16

What do chemists do?

study the properties of matter

17

When something dissolves in a liquid it...

disappears into the liquid

18

The iodine test checks for...

starch

19

If there is starch in a substance, what colour will the iodine test show?

purple

20

the scale of ph is from

0-14

21

0-6 on the ph scale is considered...

acid

22

7-14 on the ph scale is considered...

base

23

Human blood's ph is...

7.4

24

is stomach juice an acid or a base?

acid

25

Food colouring diffuses quicker in hot or cold water?

hot

26

Decantation

a method to separate the mixtures of solids and liquids

27

Breaking a branch off a tree is an example of what kind of change?

physical change

28

The order of steps taken in a science lab is (6)

Question, hypothesis, materials, procedure, observations, and conclusions

29

An observation is

what you actually see, hear, smell, taste or feel

30

An inference is

a guess based on what you observe

31

How do you remove salt from soil?

Pour water through the soil because the salt will dissolve and will go through the soil in the water

32

If you are making a water filtration system in a funnel, how should you put the layers? Draw a filter and show the layers from the bottom too top using sand, gravel and pebbles

From largest to smallest: Pebbles, then gravel, then sand