Classification Of Matter

Question 1

Substance

Answer 1

Composition that does not vary from sample to sample

Question 2

Elements

Answer 2

Substance that cannot be decomposed to simpler substances

Question 3

Compound

Answer 3

Can be decomposed into simpler substances because it is made up of more than one element
Made of 2+ types of atoms
Relative composition

Question 4

Law of Constant Composition /Definite proportions

Answer 4

States that compounds have a definite composition therefore the relative no. of atoms of each element in the compound is the same in any sample

Question 5

Physical properties

Answer 5

Observed without changing a substance into another substance

Question 6

Intensive properties

Answer 6

Independent on Amt og substance present like density

Question 7

Extensive properties

Answer 7

Opp of intensive e.g mass

Question 8

Physical changes

Answer 8

Changes in matter that don’t change composition of substance like temperature and changes of state

Question 9

Chemical changes

Answer 9

Result in new substances like combustion

Question 10

Peta

Answer 10

10^15

Question 11

Teta

Answer 11

10^12

Question 12

Giga

Answer 12

10^9

Question 13

Mega

Answer 13

10^6

Question 14

Kilo

Answer 14

10^3

Question 15

Deci

Answer 15

10^-1

Question 16

Centi

Answer 16

10^-2

Question 17

Milli

Answer 17

10^-3

Question 18

Micro

Answer 18

10^-6

Question 19

Nano

Answer 19

10^-9

Question 20

Pico

Answer 20

10^-12

Question 21

Femto

Answer 21

10^-15

Question 22

Atto

Answer 22

10^-18

Question 23

Zepto

Answer 23

10^-21

Question 24

Energy

Answer 24

Capacity to do work or transfer heat
Joules (J)

Question 25

Work

Answer 25

Energy transferred when a force is exerted on an object causing displacement of that object

Question 26

Heat

Answer 26

Energy used to cause temp of object to rise

Question 27

Force

Answer 27

Push or pull force

Question 28

Exact number

Answer 28

Counted numbers like 12 eggs is a dozen

Question 29

Inexact numbers /measured

Answer 29

Numbers dependant on how they were measured

Question 30

Significant numbers

Answer 30

Digits of a measured quantity including uncertain ones