Atmosphere and Acids

Question 1

Name black substance that forms when heating copper powder

Answer 1

Copper Oxide

Question 2

Why is Argon extremely unreactive

Answer 2

-Argon already has a full outer shell of electrons

-Therefore it does not need to gain or lose electrons

Question 3

Observation when burning Magnesium reacts with oxygen

Answer 3

-Bright white light

-White powder formed

Question 4

Chemical equation for Magnesium and Oxygen

Answer 4

2Mg +O2 —-> 2MgO

Question 5

Why should you use a cotton wool plug in experiments

Answer 5

To stop gas from escaping and make results accurate

Question 6

Define Thermal Decomposition

Answer 6

Breaking down substances using heat

Question 7

Litmus paper test results

Answer 7

Red in acidic solutions

Blue in alkaline

Purple in neutral

Question 8

Phenolphthalein Results

Answer 8

Colourless in acidic solutions

Bright pink in alkaline solutions

Question 9

Methyl Orange results

Answer 9

Red in acidic

Yellow in alkaline

Question 10

Acid definition

Answer 10

Acids are H+ donors

Question 11

Base definition

Answer 11

A base is a substance that can neutralize an acid. H+ acceptor

Question 12

Alkali definition

Answer 12

Alkalis are soluble bases, OH- Donor.

Question 13

Percentage of Oxygen in the atmosphere

Answer 13

21%

Question 14

Percentage of Argon in the atmosphere

Answer 14

0.9% argon

Question 15

Percentage of nitrogen in the atmosphere

Answer 15

78%

Question 16

Percentage of Carbon Dioxide in the atmosphere

Answer 16

0.04%

Question 17

When experimenting the percentage of oxygen in the atmosphere why does the water level rise as the reaction occurs

Answer 17

Because the volume of oxygen in the jar decreases so the water rises to equalise the pressure.