Chemical Changes

Question 1

Elements

Answer 1

Pure substance containing one type of atom

Question 2

Elements can be seperated into

Answer 2

metals and non metals

Question 3

Chemical Symbol

Answer 3

Abbreviation of an elements name

Question 4

Compounds

Answer 4

are pure substances containing the one type of molecule.

molecules must contain atleast two different elements

Question 5

Decomposition

Answer 5

Breaking a compund down into simpler substances

Question 6

who devised the Periodic table

Answer 6

Mendeleev

Question 7

Periodic table notes

Answer 7

an element position on the periodical table indicates its chemical properties

Group Numbers

Question 8

Horizontal rows of an elements are called

Answer 8

periods

indicates the number of electron shells

eg:
period three has 3 electrons

Question 9

electrons

Answer 9

negative charge

Question 10

protons

Answer 10

positive charge

Question 11

neutrons

Answer 11

neutral

Question 12

knowledge of atom structure was gradually built from the contributions of many scientists over time

Answer 12

Dalton,Faraday,Thompson,Bohr,Chadwick

Question 13

Atomic Number

Answer 13

number of protons

Question 14

Mass Number

Answer 14

number of protons + number of neutrons

Question 15

atoms always have

Answer 15

equal numbers of electrons and protons

Question 16

Ironic Compounds

Answer 16

form between metall atoms and non metal atoms

Question 17

Metals have

Answer 17

1,2,3 outer shell(valence electrons) electrons

Question 18

non metals have

Answer 18

5,6,7 or 8 outer shell electrons

Question 19

ionic compund form when

Answer 19

metals donate their valence electrons to non- metal atoms

by doing this both metal and non metal atoms can achieve the stabe nuber of 8electrons in their outer electron shells

Question 20

Ions

Answer 20

atoms that gain or lose electrons

Question 21

Average Speed

m/s

Answer 21

Distance(M)
_________
Time (S)

Question 22

Speed is also measured in

Answer 22

Km/H

Question 23

measure Distance?

Answer 23

Tape Measure

Question 24

Measure Time?

Answer 24

Stop Watch

Question 25

Velocity

Answer 25

is speed in a specified direction

Question 26

Ticker time

Answer 26

produces a series or patterns of dots on the paper strip pulled by the trolley

Question 27

Inertia

Answer 27

This is the property of an object to resist a change in motion

Question 28

Newton’s 1’st Law

Answer 28

property of inertia

example seatbealt

keep travelling

Question 29

Pyramid distance time speed

Answer 29

D
____
S/T

Question 30

Newton’s 2nd Law

Answer 30

mass of an object is kept constant then its acceleration is directly related to the force put on it

F=MxA

Question 31

Newton’s 3rd Law

Answer 31

For every action force there is an equal but opposite in direction reaction force

> larger force the object will move that way

Question 32

Who is Mica’s most most most favourite friend?

Answer 32

RUI OF COURSE!!! :D

Lies… its Eb ;)

Question 33

Take a break

Answer 33

:D

Question 34

Message your best friend

Answer 34

Now!!!!

Question 35

Seatbelt -1st law

Answer 35

Seatbelt acts as unbalanced force which stops you from continuing at a constant speed through the windshield.

Question 36

Calculating Acceleration

Answer 36

Acceleration= Change in speed/Time

Acceleration= Final speed(m/s) - Starting speed (m/s) / Time

(m/s)