Chemistry

Question 0

Alkali

Answer 0

Base that dissolves in water

Question 1

Acid

Answer 1

Substance that release H+ ions into aqueous solution 
Sour, corrosive, corrodes metals 
Turn litmus paper red 
Reacts some metals releasing H gas 
Neutralised by base

Question 2

Base

Answer 2

Substance that release OH-

Caustic, soapy slimy feel, turns red litmus paper blue, bitter, conduct elec, neutralised by acid

Question 3

Indicator

Answer 3

Chem that changes colour to show whether substance is acidic, neutral or basic

Question 4

Litmus paper

Answer 4

Indicator- turns red at presence of acid & blue at presence of base

Question 5

pH

Answer 5

Scale used to measure concentration of H+ ions in solution

Question 6

Photosynthesis

Answer 6

RXN plants use to produce glucose
Energy absorbed from sun- endothermic
Water + co2 –> glucose + O

Question 7

Combustion

Answer 7

When something reacts with oxygen, burn or exploding as it does so

Question 8

If O is restricted

Answer 8

Incomplete combustion, ‘dirty’

Question 9

aerobic respiration

Answer 9

Combines glucose and oxygen to get E & CO2 + water

Mitochondria has enzymes to assist aerobic

Question 10

Corrosion

Answer 10

Chem RXN that breaks metals down to form other compounds, oxidation RXN

Question 11

Periodic table

Answer 11

Groups vertical
Periods Horizontal
Left side - bases
Right side/group 7 , can be all acidic

Question 12

Materials from volcano

Answer 12

HSO, ash, volcanic rock, lava, steam

Question 13

Layers of earth

Answer 13

P&s waves used, travel at diff speed through diff materials

Question 14

Evidence of PT

Answer 14

Seafloor spreading, magnet striping, mountains & volcanoes, ocean ridges, trenches, volcanic islands/arc, island arc, age of Seafloor, sediment thickness, rock patterns, glacial evidence, rift valleys