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WorksheetsGrade 8 8F Review
Total questions: 44
Worksheet time: 24mins
What are atoms?
All the small things in Science
Tiny particles that make up all matter
Compounds of different elements
Molecules of the same element
Atomic Theory says that "atoms are indestructible and cannot be created or destroyed". What does this mean?
It is very hard to create or destroy atoms.
New atoms can only be created by the Earth, not people
Global warming is dangerous because it can destroy atoms and we cannot make new ones.
There are the same number of atoms now as there was 1,000,000 years ago.
How many unique(not the same kinds) of atoms are there in water?
3: 2 kinds of hydrogen, 1 kind of oxygen
3: 2 kinds of oxygen, one kind of hydrogen
2: 1 kind of hydrogen, 1 kind of oxygen
1: 1 kind of water.
Describe the bonding of atoms in water
1 hydrogen bonded to 1 hydrogen and 1 oxygen
1 hydrogen bonded to 2 oxygen
1 oxygen bonded to 2 hydrogen
1 water bonded to itself
What happens during a chemical reaction?
The atoms in the reactants rearrange to form the products
The atoms in the products rearrange to form the reactants
The atoms in the reactants change to form the atoms in the products
The atoms in the products change to form the atoms in the reactants
Different elements have different properties because
They have different theories
They have different symbols
The have different names
They have different atoms
Which are examples of physical properties?
Flammability
Conduction of electricity
Strength
Acidity/alkalinity (pH)
What are the IUPAC rules for symbols on the periodic table?
Each element's unique symbol is the first 2 letters of its name.
Each element has a unique 1 or 2 letter symbol and the first letter is capitalized
Each element has a unique 1 or 2 letter symbol and the second letter is capitalized
Symbols can be any number of letters, as long as the unique combination is not used for another element.
Which describes chemical reactions?
Nothing happens
New substances form
No new substances form
A substance changes state
Which choices are chemical properties?
Flammability
Acidity/alkalinity (pH)
Colour
Flexability
What is a 'hypothesis'?
A choice
A chemical
An answer
A prediction
The Law of Conservation of Mass is explained by Atomic Theory(Model) because
The smaller atoms in the reactants combine to make bigger atoms in the products
The atoms in the reactants will be the same atoms in the products
There is the same number of atoms in the products as in the reactants
The atoms of the reactants change to become the atoms of the products
What is the ratio of hydrogen to oxygen in water?
1:1
2:2
1:2
2:1
Carbon monoxide contains one carbon atom and one oxygen atom. Carbon dioxide contains one carbon atom and two oxygen atoms. Therefore, to make 100 molecules of carbon monoxide I need _______ as much oxygen as to make 100 molecules of carbon dioxide
One quarter(1/4)
half(1/2)
Twice(2)
Four times(4)
Carbon reacts with oxygen as follows:
carbon(C) + oxygen(O2) → carbon dioxide(CO2)
What is the ratio of carbon to carbon dioxide?
1:1
3:1
1:2
2:1
Where can we find the ratio of elements in a compound?
On the Periodic Table
In the beaker
In the chemical formula
The English Chemist John Dalton created this theory....
Atomic Theory
The Theory of Evolution
Gravity Theory
The Theory of Science
What could be used as evidence that a chemical reaction happened?
A temperature change
A substance was formed
A substance was destroyed
A colour change
Chemist Johann Dobereiner described chemical 'triads' in the periodic table. Elements in the same triad have similar..
physical properties
symbols
chemical properties
names
Many scientists had calculated the masses of different atoms so English chemist John Newlands put the elements in order of increasing masses of their atoms. It showed that every 8th element had similar properties (this was later proved unreliable). He called this the...
Law of John Newlands
Law of Properties
Law of Eights
Law of Octaves
How are the elements ordered in the periodic table?
In order of mass
In order of name
In order of electrical conductivity
In order of symbol
Elements in the periodic table with the same properties will be in the same...
Period
Group
Number
Square
Based on this image on a 'periodic table', the mass of Ekasilicon will be greater than the mass of...
Silicon(si)
Gallium(Ga)
Arsenic(As)
Tin(Sn)
Chlorine, Bromine, and Iodine are examples of the periodic table group called...
Halogens
Alkali Metals
Noble Gases
Transition Metals
This periodic group is known for being unreactive..
Halogens
Alkali metals
Noble gases
Transition metals
Which element would be expected to act in a similar way to Chlorine (Cl) in a reaction?
Sodium(Na)
Oxygen(O)
Bromine(Br)
Carbon(C)
What are the states of matter?
Cold, warm, hot
solid, liquid, gas
metal, metalloid, non-metal
light, average, heavy
Choose the general transitions of state for a given compound as temperature decreases
Solid->liquid->gas
Solid->gas->liquid
Gas->liquid->solid
Liquid->solid->gas
What happens at the boiling point of a substance?
Solid substance will become a liquid
A gas will keep being a gas
A gas will become a liquid
A liquid will become a gas
If the boiling point of element X is 100℃, what could be a possible freezing point?
-100℃
150℃
50℃
0℃
What do we call patterns of change that can be seen on the Periodic Table?
Periodic Trends
Periodic Patterns
Periodic Differences
Periodic Changes
Compared with a periodic group of non-transition metals, a periodic group of transition metals has ______ elements
More
Fewer
The same number of
It depends
What characteristic is not associated with non-metals?
Dull
Flexible
Low conductivity of heat
Low conductivity of electricity
Alkali metals are stored in oils because they react actively with...
Nitrogen
Sulfur
Oxygen
Water
The speed that an element will react can be called the element's...
Reaction
Time
Speed
Reactivity
What property shows a periodic trend for oxides across a period(row)
Acidity/Alkalinity (pH)
Size
Strength
Conductivity of heat
Complete the following alkali metal word equation:
Lithium + water ->
Lithium water
Lithium hydroxide + hydrogen
Lithium oxide + hydrogen oxide
Lithium hydrogen + oxygen
A _____ property is a property that can be seen without changing the substance into a new substance.
physical
chemical
atomic
elemental
States of Matter are an example of which kind of property?
Atomic
Chemical
Elemental
Physical
What are the states of matter?
Solid
Liquid
Fluid
Gas
This is a graph that shows substance X cooling over time. What state would substance X be in at 40°C?
Solid
Gas and liquid
Gas
Liquid and Solid
This is the change of state graph for the newly discovered Fieldenium (Fi). What point or points best show boiling?
A
C-D
D-E
E
.
Which statement correctly describes the Periodic Table?
The transition metals are examples of alkali metals
Halogens are the most reactive metals
'periods' are rows in the Periodic Table
Elements in the Periodic Table are classified as only 'metals' or 'non-metals'
The 'valency of an element's atom' is...
The number of bonds it makes in its own atom
The number of bonds it makes with other atoms in a compound
The kind of atom the element is (metal, metalloid, non-metal)
The kind of atom the element is (carbon, oxygen, etc.)
