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133 terms

Year 8 Chemistry Revision

Combines Elements, Introduction to Chemistry and Acids & Bases
STUDY
PLAY
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