chapter 2: reaction types

Question 1

if a chemical goes dark red when universal indicator is added it is very …

Answer 1

acidic

Question 2

ion

Answer 2

charged atom

can be positively or negatively charged

Question 3

anion

Answer 3

negatively charged ion

Question 4

cation

Answer 4

positively charged ion

Question 5

compound

Answer 5

chemically bonded

‘stuck together’

Question 6

electron

Answer 6

a negatively charged, sub atomic particle

—> we have three •protons (+)
• neutrons (nil)
• electrons (-)

Question 7

neutron

Answer 7

a neutral/ no charge, subatomic particle

Question 8

proton

Answer 8

a positively charged subatomic particle

Question 9

ductile

Answer 9

is used to make wire

Question 10

lustrous

Answer 10

shiny

Question 11

malleable

Answer 11

can bend and hammer it

Question 12

indicator

Answer 12

a substance that measures PH by changing colour

Question 13

polyatomic

Answer 13

containing more than one atom

Question 14

atom

Answer 14

the fundamental building block and all materials

it consists of a cluster of subatomic particles

Question 15

atomic symbol

Answer 15

a shorthand notation for describing an atom

Question 16

Crystal lattice

Answer 16

a grid like structure of atoms Igor ions in which each particle is bonded to all of its neighbouring atoms

Question 17

electron cloud

Answer 17

the region of negative charge surrounding the nucleus

Question 18

electron shell

Answer 18

part of the electron cloud

a layer that surrounds the nucleus and can only hold a certain number of electrons

Question 19

mass number

Answer 19

the number of protons and neutrons in an atom

Question 20

neutral

Answer 20

having no overall charge

Question 21

subatomic particles

Answer 21

particles - the smaller particles that atoms are made of

Question 22

polymer

Answer 22

multiple atoms put together in a chain like structure

Question 23

base

Answer 23

PH lever is higher than 7, blueish, colour, contains OH ions

Question 24

half- life

Answer 24

the time it takes for a radioactive atom to lose half of its nucleus (decay) is its half life

Question 25

incomplete combustion

Answer 25

limited air, if chemical/ equation gives off carbon then it’s incomplete

Question 26

complete combustion

Answer 26

if product/ equation gives off lots of air then the reaction is complete