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WorksheetsG8 Chemistry unit 7 and unit 8 review
Total questions: 26
Worksheet time: 13mins
How to say "可逆的" in English
revenue
reversible
reversion
revertible
Which of the following is the definition of Combustion Reactions
The substances you end up with are different from the ones you started with.
The change is usually difficult to reverse. At the end of the reaction, you cannot easily get back the substances you started with.
Any reaction in which a substance reacts quickly with oxygen, and gives out heat and light
a ceramic or metal container in which metals or other substances may be melted or subjected to very high temperatures
Hydrochloric acid + magnesium → ? + ?
Magnesium + water
Magnesium Chloride + Hydrogen
Magnesium Hydroxide + Chlorine
Magnesium Chloride + Hydroxide
Magnesium + oxygen → Magnesium oxide
Carbon + oxygen → Carbon dioxide
The arrow means What
become reactant
reversible
react
react to make
what is (aq) mean
containing water; like water
a tank or pool or bowl filled with water for keeping live fish and underwater animals
react with water
to show that a substance is dissolved in
Acid + Alkali ——> ?
Salt + water
Salt + metal
Salt + non-metal
metal + water
What is the flame colour of the sodium chloride
yellow
blue
lilac
Blue-green
Na(s) + H2O ⟶ NaOH + ...........
CO2
H2O
H2
O2
________and_________make up the nucleus.
Neutron and electron
electron and proton
Neutron and proton
Atom and electron
Why do atoms have no electric charge?
This is because, in any ions, the number of protons is the same as the number of electrons.
This is because, in any atom, the number of protons is the same as the number of electrons.
This is because, in any atom, the number of electrons is the same as the number of neutrons.
This is because, in any atom, the number of neutron is the same as the number of protons.
Which of the following line represent "the positive alpha particles hit the centre of the nucleus"
1
2
3
In the modern periodic table, the elements are arranged in order of their number of (a) .
Electrons whizz around an atom outside its nucleus. The electrons occupy shells. Shells are also called _______or________.
shells
energy levels
electon field
orbits
The group number is the _______ as the number of outer shell electrons, from Group I to Group VII.
same
different
What is the definition of "Isotope"
(remind: Read the following definition carefully)
Atoms of the same element that have same numbers of neutrons are called isotopes.
Atoms of the different element that have same numbers of neutrons are called isotopes.
Atoms of the same element that have different numbers of protons are called isotopes.
Atoms of the same element that have different numbers of neutrons are called isotopes.
The columns of the periodic table are called________.
teams
lines
groups
clan
Find the difference between group 1 metals and other metals
Group 1 metals are softer than most other metals，can be easily cut with a knife.
Group 1 metals have low melting points compared to most other metals.
Group 1 metals don't conduct electricity and they are not shiny when freshly cut
Group 1 metals have low densities compared to most other metals.
From top to bottom of Group 1:
The reactions with water get ________vigorous.
less
more
constant
unstable
Group 7 elements are called______.
Hydrogen
Metal
Halogen
Hexagon
Intramolecular force is______ (strong or weak)
Intermolecular force is______ (strong or weak)
stong, weak
weak, strong
For the Group 7 elements, reactions get ______ vigorous going ______ the group.
less, up
more down
less, down
more, up
The horizontal rows of the periodic table are called__________.
row
ray
group
period
which following state is right
The group number indicates the number of electron.
The period number indicates the number of shells.
The group number indicates the number of shells.
The period number indicates the number of nucleons.
Which of the following equations are correctly balanced?
12CO2 + H2O ---> C6H12O6 + O2
CO2 + H2O ---> 3C6H12O6 + O2
CO2 + 9H2O ---> C6H12O6 + O2
6CO2 + 6H2O ---> C6H12O6 + 6O2
Going ________ group 7,
melting point and boiling point __________.
up, increase
down, increase
up, stay same
down, decrease
Melting and boiling points _________ going __________ Group 7. This is because the molecules become _________. the intermolecular forces become __________.
increase, up, larger, weaker
increase, down, smaller, stronger
increase, down, larger, stronger
decrease, down, lager, stronger
