science ch 2 & 3

Question 1

The formula for density is

Answer 1

D = m/v

Question 2

If an object floats that means its density is ____ liquid.

Answer 2

less

Question 3

If an object sinks that means its density is ____ liquid.

Answer 3

denser

Question 4

When the density of the liquid and object are the same, wherever you place the object…..

Answer 4

it will stay still/float

Question 5

Matter is…

Answer 5

What things are made of & Anything that takes up space

Question 6

Density’s unit is always..

Answer 6

cubed

Question 7

Mixing pure substances form

Answer 7

Mixtures

Question 8

Matter is classified as a pure substance

Answer 8

when all of the particles are identical

Question 9

Matter is classified as a mixture

Answer 9

when there is different types of particles.

Question 10

The difference between Pure substance and Mixture is that..

Answer 10

Pure substance = all particles identical
Mixture: different types of particles

Question 11

Heterogenous is

Answer 11

when a substance is not even

Question 12

Homogenous is

Answer 12

when a substance is even

Question 13

Physical PROPERTIES is

Answer 13

matter you can observe with 5 senses

Question 14

Chemical PROPERTIES is

Answer 14

how matter reacts and changes into something new

Question 15

Physical CHANGE

Answer 15

change that only happens physically and is reversible & stays the same

Question 16

Chemical CHANGE

Answer 16

change that changes the chemical formula and is forming with new substances

Question 17

The states of matter are..

Answer 17

• Solid
• Liquid
• Gas
• Plasma

Question 18

The particles for a solid are

Answer 18

tight and packed

Question 19

The particles of a gas are

Answer 19

Very fast and breaking apart

Question 20

The particles of a liquid are

Answer 20

moving faster than solid, more space between them

Question 21

The particles for plasma are

Answer 21

electrons are separated from particles and move around

Question 22

The kinetic-molecular theory is that the states of matter….

Answer 22

have tiny particles and are always in motion

Question 23

Elements are pure substances that are made of only..

Answer 23

one type of atom. (mushroom)

Question 24

Compounds are pure substances that are made of..

Answer 24

multiple types of atoms (a group of mushrooms and broccolis as one)

Question 25

The law of conservation of energy is

Answer 25

energy cannot be created or destroyed

Question 26

The law of conservation of mass is

Answer 26

mass cannot be created or destroyed