WorksheetsGrade 8 8G Review
Total questions: 40
Worksheet time: 25mins
Metals and non-metals can be differentiated by their .....
physical properties
acidity
boiling points
mass
Which qualities are associated with metals?
Good conductor of heat
Brittle
Flexible
Shiny
The burning of wax in this image is a....
chemical change
physical change
chemical reaction
physical reaction
Most metals will react with...
Oxygen
Copper
Halogens
Iron
"Speed of reaction" refers to...
How long a reaction takes to finish
The rate of reaction
The amount of seconds for half of the reaction finish
How fast a reaction will move forward (proceed)
Which feature(s) describe catalysts?
Change the rate of reaction
Must be a metal
Are used up in the reaction
Are required for a reaction to occur
Corrosion is the reaction of ________ with metal and occurs ________
oxygen; on the surface only
Water; on the surface only
Oxygen; anywhere on the metal
Water; anywhere on the metal
Which option(s) correctly describes corrosion and rusting
Corrosion describes any metal that reacts with oxygen, Rusting is the corrosion of iron specifically
Corrosion describes any metal that reacts with oxygen, rusting is the corrosion of transition metals specifically
Corrosion occurs only in non-metals, rusting occurs in metals
Corrosion happens first and then rusting happens on top of the corrosion
Corrosion will only occur if there is _____ in the air
oxygen
nitrogen
water
argon
What equations are shown in this image?
word equation
symbol equation
chemistry equation
oxygen equation
Where would you be able to find the meaning of the symbols used in 'symbol equations'?
The periodic table
The names of elements
The name of the compounds
The chemical table
Why is the symbol for oxygen 'O' on the periodic table but ' O2 ' in reactions involving oxygen?
O and O2 mean the same thing
'O' is a molecule and ' O2 ' is an element
Oxygen is a molecule in nature but an atom on the periodic table
Oxygen is always ' O2 ' but there is less space on the periodic table
What does this experiment teach us about rust formation?
Water does not contain air
Rusting requires both air and water
Rust will form with just water, but forms faster with air
Rust requires either air or water, but not both
The reaction for rusting is also more complex. We can summarise it as:
iron + oxygen + water → iron hydroxide
Which elements are in rust (iron hydroxide)?
Fe
H
O
Ir
When iron reacts with oxygen and water to form rust, it....
creates a protective layer, strengthening the iron
will slide off of the metal after it rains
attracts water, making the iron bigger
goes deeper into the metal, weakening the iron
Which are ways to protect iron from rusting?
coat (cover) it with oil
coat it with plastic
coat it with powder
coat it with paint
The chemical formula for rust (iron hydroxide) is Fe(OH)2 . Which ratio(s) correctly describe the elements in iron hydroxide?
1 Fe : 1 O
1 O : 1 H
2 H : 1 O
2 Fe : 1 O
The general reaction for metals with water is listed below:
metal + water → metal hydroxide + hydrogen
Which parts will change depending on the metal being used?
metal
water
metal hydroxide
hydrogen
The general reaction between metals and water is listed below: metal + water → metal hydroxide + hydrogen
How would this reaction change if the water is hot or cold?
The reaction will not happen in cold water but will happen in hot water
The reaction will happen slower in cold water than in hot water
The reaction will happen in cold water but will not happen in hot water
The reaction will happen only if ice is used
Metals are organized in a 'reactivity series' based on their...
ability to react
mass of the compounds
pH
ability to change state
Which changes describe what occurs with increasing reactivity
can catch fire
increasing speed of reaction
increasing rate of reaction
increasing mass of products
What information can we tell from this reactivity chart?
Fe is more reactive than Zn
The kind of reactivity is the same for metals with oxygen and with water
The speed of reactivity is the same for metals with oxygen and with water
The order of reactivity is the same for metals with oxygen and with water
Fieldenium (Fi) reacts very quickly (✓✓✓) with oxygen and reacts (✓) with water. Where would it be placed on the reactivity series?
above aluminum and below magnesium
above magnesium and below potassium
below zinc and above iron
below calcium and above magnesium
What are features of good quality evidence?
accurate
reliable
digital
numerical (must be numbers)
"How close a measurement is to its true value" describes....
luck
skill
precision
accuracy
Which device would be easier to get an accurate measurement from?
beaker
measuring cylinder
both are equally easy
whichever device has bigger numbers
What is the problem with how this man is measuring volume?
He should be looking at the level with his eyes above the liquid's meniscus
He should be looking at the level with his eyes below the liquid's meniscus
He must take off his goggles to read the level
There is no problem, he is measuring correctly
What can we do to get good data?
Use the correct equipment
Control all the variables
Use the equipment correctly
Use the most expensive equipment
In experiments we repeat measurements because...
we might have made a mistake the first time
it is hard to follow the instructions of labs
the first data number could be an outlier
equipment is complicated to use
reliable data (data that we can trust) is...
reproduceable
returnable
rewindable
repeatable
'reliable results' means that results
will be the same (or very similar) no matter who does the experiment
will be the same (or very similar) each time you do the experiment
will be the same (or very similar) no matter which lab you do the experiment in
will be the same (or very similar) no matter if the teacher or student does the experiment
These metals reacting with water and hydrochloric acid have the same...
speed of reaction
products
order of reactivity
reactants
When metals react with acids, 'effervescence' occurs and the metals seems to disappear. What does effervescence mean?
The formation of a liquid
The disappearing of the metal
The bubbling off of a gas
The turning of metal into air
The effervescence of metals occurs as follows:
metal + acid→ salt + hydrogen
The salt formed depends on the...
metal used
acid used
container used
temperature used
Most metals we use are mixtures of different metals, these metals are called
composites
alloys
mixes
half metals
Alloys are often used instead of pure metals because their ________ will be different than the main metal they are made of
strength
names
properties
chemical symbols
The malleability of metals is how much they can bend without breaking and is determined by
The person trying to break the metal
The structure of the atoms in the compound/element
The size of the atoms in the compound/element
The kind of pressure put on the metal
The melting point of an alloy will be _______ the melting point of the metals that make up the alloy
lower than
the same as
the average of
higher than
Which metal(s) are an alloy?
Iron
Stainless Steel
Tin
Duralumin
Where are alloys on the periodic table?
On the left side
On the right side
In the middle
They are not on the periodic table
