Oxygen and Oxides

Question 1

What is a reactive element

Answer 1

Noble gases have low reactivity because they have a full outer shell.

Question 2

Air what are the %

Answer 2

Is made up of 78% nitrogen and 21% oxygen

Question 3

What is thermal decomposition

Answer 3

Usually endothermic reaction , where heat is required at a certain temp to decompose the reactant.

Question 4

Test for finding carbon dioxide,

Answer 4

Would be to run carbon dioxide through an aqueous solution of calcium hydroxide, which turns water milky.

Question 5

non-metal oxides are normally in which state

Answer 5

gas

Question 6

metal oxides are normally in which state

Answer 6

solid

Question 7

What is a hydrocarbon ?

Answer 7

hydrogen and carbon mixed

Question 8

What is the difference between full combustion and incomplete combustion to do with flame colours and carbon?

Answer 8

Full combustion, produces a blue colour in the flame and two oxygens thus CO2 is produced, and incomplete combustion produces a yellow flame, because there’s insufficient oxygen and also incomplete combustion can form carbon or black suit.

Question 9

Catalytic converters ?

Answer 9

used to take nitrogen oxide, plus carbon monoxide from petrol .

Question 10

What yellow solid burns with a blue flame to produce a gas which is acidic when dissolved in water

Answer 10

Non-metal, Sulphur

Question 11

A brown shiny malleable solid that turns black when heated in air

Answer 11

Metal, Copper

Question 12

How to test their is oxygen in the air?

Answer 12

Relights a glowing splint

Question 13

State the test for carbon dioxide

Answer 13

Turns limewater milky