science

Question 1

what are the three states of matter

Answer 1

solids, liquids and gases

Question 2

what is shape change

Answer 2

the substance is altered to be shaped differently

Question 3

what is mixing

Answer 3

combinig two substances together

Question 4

what is dissolving

Answer 4

placing a solute and a solvent

Question 5

what is a solute

Answer 5

A solute is a substance that can be dissolved into a solution by a solvent

Question 6

what is a solvent

Answer 6

a solvent is the substance in which a solute dissolves to produce a homogeneous mixture.

Question 7

what is expansion

Answer 7

heat causes the substance to expand

Question 8

what is contraction

Answer 8

cold causes the substance to shrink

Question 9

what is melting

Answer 9

heating a solid until it becomes a liquid

Question 10

vaporisation

Answer 10

heating a liquid until it becomes gas

Question 11

condensation

Answer 11

cooling a gas until it becomes a liquid

Question 12

freezing

Answer 12

cooling a liquid until it becomes a solid

Question 13

what are atoms

Answer 13

Inside an atom there are subatomic particles called:
* Electrons (negatively charged) - these move around the outside of the nucleus
* Protons (positively charged)
* Neutrons (neutral)

Question 14

what are molecules

Answer 14

molecules are two or more atoms bonded to create a molecule

Question 15

what are elements

Answer 15

An element is any substance made up entirely of one particular type of atom – the basic building blocks of stuff. We know that elements have three ingredients: protons, neutrons, and electrons.

Question 16

solidifying

Answer 16

changing a liquid to solid

Question 17

sublimation

Answer 17

changing a solid to a gas

Question 18

deposition

Answer 18

changing gas to a solid

Question 19

what is diffusion

Answer 19

example: if someone opens a bottle of perfume in the middle of the room, you soon smell it in other parts of the room

Question 20

controlled variable

Answer 20

a controlled variable is something that stays the same

Question 21

dependent variable

Answer 21

a dependent variable is something that can be measured

Question 22

independent variable

Answer 22

an independent variable is something that purposely changes.

Question 23

WHAT IS DENSITY !!!!!!!!!!

Answer 23

density is how much mass is packed into a measured volume

density (g/cm3) = mass (g)/ volume (cm3)

Question 24

what is matter

Answer 24

1. Everything is made of matter
   
   2. Matter is anything that takes up space and has mass
   3. ‘Matter’ comes from the Latin root meaning “stuff”

Question 25

what is a physical change

Answer 25

the appearance or form of the matter changes but the kind of matter in the substance does not.

Question 26

what is a chemical change

Answer 26

In A chemical change atoms in the molecules change to form different combinations of atoms (new substances)

Question 27

A chemical equation is

Answer 27

reactant + reactant - product + product
Reactant – substance/s you start with
Product – substance/s you end up with