Year 8 Chemistry Revision

Created by Volks Teacher

133 terms · Combines Elements, Introduction to Chemistry and Acids & Bases

Hydrogen

Acids always contain this element

Red

The colour acids turn litmus paper

Below

Acids have a pH ABOVE/BELOW 7

Sour

Solutions of acids taste ..................

Blue

The colour bases turn litmus paper

Above

Bases have a pH ABOVE/BELOW 7

Bitter

Solutions of bases taste .................

Soapy

Solutions of bases feel .................

Base

A cleaning product is usually a ACID/BASE?

Acid

Most fruits are usually a ACID/BASE?

Base

Has a pH above 7

Acid

Has a pH below 7

Neutral

Has a pH of 7

Alkalis

Water soluble bases

7

Water has a pH of ...........

14

The pH scale ranges from 1- ...........

Neutralisation

The reaction when acids and bases are mixed

Water

In a neutralisation reaction, the products are salt and .................

Salt

In a neutralisation reaction, the products are water and .................

Base

A carbonate (eg. bicarbonate of soda) is an ACID/BASE?

Base

A hydroxide (eg. sodium hydroxide) is an ACID/BASE?

Element

A pure chemical consisting of only ONE type of atom

Atom

A small indivisible particle which is the basic building block of all matter

Compound

2 or more different types of atoms chemically combined

Molecule

2 or more different non-metals chemically combined

Ionic Lattice

The structure formed when non-metals and metals chemically combine

Periodic table

A list of the elements, organised based on their chemical properties

Metals

The majority of elements in the Periodic Table

Non-metals

The element on the left-hand side of the Periodic Table and Hydrogen (coloured in red)

Metalloids

The elements found on the staircase of the Periodic Table (coloured in pink)

Periods

The horizontal rows on the Periodic Table

Groups

The vertical columns in the Periodic Table. Always numbered with Roman Numerals

Lustrous

A property of metals, meaning shiny.

Lustrous

Name the missing property of metal
1) Solid (except Mercury)
2) Malleable
3) Ductile
4) Conducts heat and electricity

Malleable

A property of metals, meaning it can be hammered into shape

Malleable

Name the missing property of metal
1) Solid (except Mercury)
2) Lustrous
3) Ductile
4) Conducts heat and electricity

Ductile

A property of metals, meaning it can be drawn into wires

Ductile

Name the missing property of metal
1) Solid (except Mercury)
2) Malleable
3) Lustrous
4) Conducts heat and electricity

Solid

Name the missing property of metal
1) Lustrous
2) Malleable
3) Ductile
4) Conducts heat and electricity

Mercury

All metals are solid at room temperature except for ................?

Conductor

A property of metals, meaning it can transmit heat or electricity

Brittle

Non metals are not hard; they are ..................

Dull

Non metals are not shiny; they are ..................

Poor

Non-metals are GOOD/POOR conductors of heat and electricity.

Metalloids

Have properties of both Metals and Non-Metals

Reactant

A chemical which is undergoes a chemical change to become a new substance

Product

A new chemical formed by the chemical change of one or more reactants

Chemical reaction

Reactants --> Products

Word equation

Uses words to describe a chemical reaction
eg.
Magnesium + Oxygen → Magnesium Oxide

Chemical Equation

Uses chemical symbols to describe a chemical reaction
eg.
Mg + O₂→ MgO

Catalyst

A chemical which speeds up a chemical reaction but is not used in it.

Hydrogen

A gas with the chemical formula H₂

Oxygen

A gas with the chemical formula O₂

Carbon Dioxide

A gas with the chemical formula CO₂

Hydrogen

The pop test is used to test for which gas?

Oxygen

If a glowing splint is placed in a gas and it re-ignites, which gas is present?

Carbon Dioxide

Which gas, when bubbled through lime-water, will turn it a milky cloudy colour

Carbon dioxide

This gas will extinguish (put out) a flame.

Temperature

There are 5 signs that a chemical reaction has taking place. What is number 5) ?
1) Production of light
2) Production of gas
3) Permanent change in colour
4) Formation of a precipitate
5) Change in .................

Light

There are 5 signs that a chemical reaction has taking place. What is number 5) ?
1) Change in temperature
2) Production of gas
3) Permanent change in colour
4) Formation of a precipitate
5) Production of

Gas

There are 5 signs that a chemical reaction has taking place. What is number 5) ?
1) Production of light
2) Change in temperature
3) Permanent change in colour
4) Formation of a precipitate
5) Production of

Temperature

There are 5 signs that a chemical reaction has taking place. What is number 5) ?
1) Production of light
2) Production of gas
3) Permanent change in colour
4) Formation of a precipitate
5) Change in .................

Colour

There are 5 signs that a chemical reaction has taking place. What is number 5) ?
1) Production of light
2) Production of gas
3) Change in temperature
4) Formation of a precipitate
5) Permanent change in ..............

Precipitate

There are 5 signs that a chemical reaction has taking place. What is number 5) ?
1) Production of light
2) Production of gas
3) Permanent change in colour
4) Change in temperature
5) Formation of a ..................

Precipitation

When 2 liquids react to form a solid, it is called a .................... reaction.

Solid

State of matter with low energy; atoms are bonded tightly.

Liquid

State of matter with medium energy; atoms are loosely bonded.

Gas

State of matter with high energy; atoms are not bonded together.

Evaporation

When a liquid is heated and becomes a gas

Condensation

When a gas is cooled and becomes a liquid

Freezing

When a liquid is cooled and becomes a solid

Melting

When a solid is heated and becomes a liquid

Sublimation

When a solid directly becomes a gas (or a gas directly becomes a solid) without first being a liquid

Size

The are 3 types of a Physical Change. Which is missing?
1) Change in shape
2) Change in state
3) Change in .........

State

The are 3 types of a Physical Change. Which is missing?
1) Change in shape
2) Change in size
3) Change in .............

Shape

The are 3 types of a Physical Change. Which is missing?
1) Change in state
2) Change in size
3) Change in ................

Precipitate

A solid formed by the reaction of two liquids

Temperature

Ways to increase the rate of a reaction are:
1) Increase the concentration
2) Decrease the particle size
3) Use a catalyst
4) Increase .....................

Concentration

Ways to increase the rate of a reaction are:
1) Increase the temperature
2) Decrease the particle size
3) Use a catalyst
4) Increase .....................

Catalyst

Ways to increase the rate of a reaction are:
1) Increase the concentration
2) Decrease the particle size
3) Increase temperature
4) Use a ............................

Size

Ways to increase the rate of a reaction are:
1) Increase the concentration
2) Increase the temperature
3) Use a catalyst
4) Decrease particle .....................

Increase

Decreasing the particle size will INCREASE/DECREASE surface area

Electron

A negatively charged subatomic particle; located outside the atomic nucleus

Proton

A subatomic particle that has a positive charge and that is found in the nucleus of an atom

Neutron

A subatomic particle that has no charge and that is found in the nucleus of an atom

Nucleus

The centre of an atom; consists of protons and neutrons

Shells

The regions of space around the nucleus in which electrons are found.

Configuration

The electron ............... describes how electrons are arranged in their shells

2

The number of electrons which can fill the 1st shell.

8

The number of electrons which can fill the 2nd shell.

8

The number of electrons which can fill the 3rd shell.(applies only to first 20 elements)

2

The number of electrons which will occupy the 4th shell. (applies only to first 20 elements)

Neutron

Electron

Proton

Nucleus

Atomic number

Identifies the atom; is equal to the number of protons

Atomic mass

Equals the number of protons + neutrons in an atom

Neutrons

Atomic Mass - Atomic Number = Number of .................

Electrons

In a neutral atom, the number of .................... is equal to the number of protons

H

Hydrogen

He

Helium

Li

Lithium

Be

Berylium

B

Boron

C

Carbon

N

Nitrogen

O

Oxygen

F

Fluorine

Ne

Neon

Na

Sodium

Mg

Magnesium

Al

Aluminium

Si

Silicon

P

Phosphorous

S

Sulphur

Cl

Chlorine

Ar

Argon

K

Potassium

Ca

Calcium

Fe

Iron

Ni

Nickel

Cu

Copper

Zn

Zinc

Br

Bromine

Ag

Silver

Sn

Tin

I

Iodine

Pt

Platinum

Au

Gold

Hg

Mercury

Pb

Lead

U

Uranium

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