Chemical Changes

Question 1

Metals that react with oxygen to produce?

Answer 1

Metal oxide

Question 2

What is the reaction called between metals and oxygen when producing metal oxide

Answer 2

Oxidation because the metals gains oxygen

Question 3

What is reduction

Answer 3

The gaining of electrons but Involves the loss of oxygen

Question 4

What is oxidation

Answer 4

The loss of Oxygen but the gain of electrons

Question 5

What type of ions do metal substances form when metal reacts with another substance

Answer 5

Positive ions

Question 6

The metals potassium sodium lithium calcium magnesium zinc iron and carbon can be put an order of the reactivity from the reactions of?

Answer 6

Reactions with water and dilute acids

Question 7

What happens if a Reactive metal is more reactive than the other metals

Answer 7

A more reactive metal can displace a less reactive metal to form a compound

Question 8

The reactions of metal with water and acids are limited to what

Answer 8

The room temperature

Question 9

Name one unreactive metal found in earth

Answer 9

Gold

Question 10

Unreactive metals such as gold are found in the Earth as a metal itself but most metals are found as what

Answer 10

Most metals are found as compounds that require chemical reactions to extract the metal

Question 11

How can carbon be extracted from metals less reactive than it

Answer 11

Metal less reactive than carbon can be extracted from their oxides by reduction with carbon

Question 12

Acids react with metals to produce

Answer 12

Salts and hydrogen

Question 13

Acids are neutralized by…

Answer 13

Alkalis and bases

Question 14

What do alkalize and bases produce

Answer 14

Salt and water

Or

By metal carbonate = Salts + water + carbon dioxide 

Question 15

How can a student make soluble salts

Answer 15

Soluble salts can be made from acids by reacting them with solid insoluble substances 

Question 16

Excess solid can be filtered

Question 17

Acids produce what

Answer 17

Hydrogen ions (H+)in aqueous solution

Question 18

Aqueous solutions of alkali’s contain what

Answer 18

Hydroxide ions (OH-)

Question 19

How can the pH scale be measured

Answer 19

Using universal indicator or a pH probe

Question 20

Neutralization reactants between us is an alkaline hydrogen ions react with hydroxide ions to produce

Answer 20

Water

H+(Aq) + OH-(Aq) > h2o(L)

Question 21

A strong acid is what in aqueous solution

Answer 21

A strong acid is completely ionized in an aqueous solution

Eg. Hydrochloric
nitrate
sulfuric acid

Question 22

A weak acid is what in aqueous solution

Answer 22

A weak acid is only partly ionized in an aqueous solution

Eg. Citric
carbonic acid
Ethanoic

Question 23

If the acid is strong what is the pH

Answer 23

The stronger the acid the lower the pH

Question 24

When an ionic compound is melted or dissolved in water what happens to the Ions

Answer 24

The ions are free to move about within the liquid or solution these liquids and solutions are able to conduct electricity they are called electrolytes

Question 25

Passing an electric current through electroless is causes the ions to do what

Answer 25

To move to the electrodes. (Cathode and anode)

Question 26

Positively charged ions move to the negative what is the negative electric called

Answer 26

Cathode

Question 27

Negatively charged ions move to the positive electrode what is the positive electrode called

Answer 27

Anode 

Question 28

When ions discharge at the electrodes what do they produce

Answer 28

Elements. This process is called electroysis

Question 29

How can metals be extracted

Answer 29

Metals can be extracted from molten compounds using electrolysis

Question 30

Why is electrolysis is used for metals

Answer 30

Electrolysis is used if the metal is too reactive to be extracted by reduction with carbon or if the metal reacts with carbon

Question 31

At the negative electrode (cathode) What is produced

Answer 31

Hydrogen is produced if the metal is more reactive than hydrogen

Question 32

At the positive electrode (anode) what is produced

Answer 32

Oxygen is produced unless the solution contains halide ions then the halogen is produced

Question 33

At the cathode (negative electorate) positively charged ions gain electrons so this reaction is called what

Answer 33

Reduction

Question 34

An anode (positive electrons) negatively charged ions lose electrons so this reaction is called

Answer 34

Oxidation