Chemistry

Question 1

What do we call the horizontal rows in the periodic table?

Answer 1

Periods

Question 2

Where are metals found in the periodic table?

Answer 2

Column 3- 12

Question 3

What name is given to the group 1 elements

Answer 3

Alkaline

Question 4

What name is given to group 7 elements?

Answer 4

Halogens

Question 5

What name is given to group 8 elements

Answer 5

Noble gases

Question 6

What do all group 1 metals have in common?

Answer 6

They all have 1 electron in outer shell

Question 7

Write down the general chemical equation between an acid and a carbonate

Answer 7

Salt + carbon dioxide + water

Question 8

Write down the general chemical equation between an acid and metal

Answer 8

Salt + hydrogen gas

Question 9

Write down the general chemical equation between an acid and base

Answer 9

Salt + water

Question 10

Write a word equation for combustion

Answer 10

Methane + oxygen + carbon dioxide + water+ energy

Question 11

Describe corrosion and write a word equation

Answer 11

Metal reacts with oxygen and is usually slower then combustion

Iron + oxygen -> iron oxide

Question 12

Describe decomposition and write a word equation

Answer 12

When a compound break up into smaller parts

Copper carbonate -> copper oxide + carbon dioxide

Question 13

Describe neutralisation and write a word equation

Answer 13

When an acid reacts with a base and produce a neutral solution

Sodium hydroxide + hydrochloric acid -> sodium chloride + water

Question 14

What is an isotope? Give an example

Answer 14

Varients of a particular chemical element which differ in the neutron number and consequently in mass number. They have same number of protons in each atom

Question 15

Describe what an exothermic reaction is and give and example

Answer 15

Chemical reactions that release energy in the form of heat or light. They include Flames, explosions and fireworks.
E.g octain + oxygen gas -> carbon dioxide + water + energy

Question 16

Describe what an endothermic reaction is and give an example

Answer 16

Chemical reactions that absorb energy are called endothermic

They usually feel cold because they absorb the heat energy from your skin and the surroundings

Question 17

What are the factors that will influence the rate of a reaction

Answer 17

Temperature
Concentration
Catalysts
Surface area

Question 18

How does temperature affect the rate of reaction

Answer 18

Particles turn heat energy into kinetic energy. When they get hotter they move faster. When they move faster they collide more often.

Question 19

How does concentration affect the rate of the reaction

Answer 19

More particles in the same space means more collisions, therefore faster collision

Question 20

How does catalysts affect the rate of a reaction

Answer 20

Catalyst reduce eh activation energy needed for a reaction. THis means less activation energy means faster reacter

Question 21

How does surface area affect the rate of the reaction

Answer 21

Larger the surface area the more places for collisions to occur. Increased in surface area allows more collisions at surface, therefore faster reaction

Question 22

What do we call the vertical columns in the periodic table?

Answer 22

Groups