science

Question 1

what is chemistry

Answer 1

chemistry is the study of matter, its structure and how it changes

Question 2

what is matter

Answer 2

everything is made up of matter, matter is up of microscopic particles called atoms

Question 3

what are the pure substances

Answer 3

compound and elements

Question 4

impure substances?

Answer 4

mixture

Question 5

element?

Answer 5

an element is a pure substance made up of only one type of atom

Question 6

compound?

Answer 6

a compound is a pure substance made up of two or more different types of atoms and are always chemically joined together.

Question 7

what are differences between elements and compounds?

Answer 7

elements cant be broken down into something similar and compounds can be broken down into something simpler

Question 8

mixture?

Answer 8

a mixture is an impure substance that is made up of more than an atom or molecule which is not chemically joined.

Question 9

all matter is made up of…

Answer 9

atoms

Question 10

atoms are tiny little….

Answer 10

particles

Question 11

……are made up of similar atoms

Answer 11

elements

Question 12

all atoms of the same elements are

Answer 12

exactly the same

Question 13

what is the difference between compounds and mixtures

Answer 13

compounds is a pure substance and is chemically joined together and a mixture is an impure substances and isn’t chemically joined together

Question 14

what is the difference between compounds and mixtures

Answer 14

compounds is a pure substance and is chemically joined together and a mixture is an impure substances and isn’t chemically joined together

Question 15

what does a chemical symbol represent

Answer 15

it represents a chemical element

Question 16

what does the atomic number stands for

Answer 16

the number of protons that the atom contains

Question 17

atomic mass meaning

Answer 17

the number of protons and neutrons that the atom contains

Question 18

in an atom, what proton, neutron or electron are the same

Answer 18

protons and electrons

Question 19

how to work out the number of neutrons in an atomic

Answer 19

you will need to subtract the atomic number from the atomic mass.

Question 20

how to find most stuff if they are elements compounds or mixtures

Answer 20

elements(C) or (B)
compounds (N2O) or (BE3)
mixtures (nothing)

Question 21

what are some things that are not substances

Answer 21

electricity
energy

Question 22

malleable meaning?

Answer 22

able to be hammered or pressed into shape without breaking or cracking.

Question 23

ductile meaning

Answer 23

can be stretched into a wire

Question 24

brittle

Answer 24

it can break easily

Question 25

properties of metal

Answer 25

shiny, solid, conducts electricity and heat, is malleable and ductile

Question 26

properties of non-metal

Answer 26

dull(not shiny), a bit are solid, most are gases, and one is liquid, does not conduct electricity, brittle, not malleable or ductile.

Question 27

properties of a metalloid

Answer 27

has some properties of metals and non-metals.

Question 28

independent variable

Answer 28

the variable being tested

Question 29

dependent variable

Answer 29

the variable being measured

Question 30

controlled variable

Answer 30

the variable that doesn't change

Question 31

what are two difference between a physical and chemical change

Answer 31

a physical change is where no new substances are made it can be reversed, a chemical change is when new substances are made and substances react and cant be reversed.

Question 32

example of a chemical change

Answer 32

when a paper is burning

Question 33

example of a physical change

Answer 33

when an ice cube melt

Question 34

name everyday chemical reactions

Answer 34

photosynthesis, rusting and chopping an onion

Question 35

list evidence a chemical reaction has occurred

Answer 35

gas bubbles, colour change and temperature change

Question 36

polymer meaning

Answer 36

polymers are long molecules made up of many smaller identical molecules (monomers).

Question 37

What is the difference between procedure and procedural recount?

Answer 37

A procedure details the steps or instructions to do or make something. Procedural recounts record steps involved in an investigation, usually in science.

Question 38

3 common compounds and their chemical formula

Answer 38

carbon dioxide- CO2 carbon monoxide CO water H2O

Question 39

properties of plastic

Answer 39

cheap,light,long lasting

Question 40

an example of a polymer and the monomer it is made up of

Answer 40

polyester made up of ester

Question 41

Which technology allows scientists to analyse atoms?

Answer 41

Electron microscope