WorksheetsYr 9 Chem Revision
Total questions: 25
Worksheet time: 17mins
Name
Class
Date
1.
If an atom has an atomic number of 8 and a mass number of 16, how many neutrons are in its nucleus?
a)
24
b)
16
c)
8
d)
12
2.
The pH scale ranges from ____________.
a)
0-7
b)
1-100
c)
1-20
d)
0-14
3.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
4.
When you combine an acid with a base it produces ___.
a)
a huge explosion
b)
a very dangerous gas
c)
a salt and water
5.
Is making salt water to gargle with a physical or chemical change?
a)
physical
b)
chemical
6.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
7.
Baking a cake by mixing flour, sugar, chocolate powder, eggs, and milk, and then heating them in the oven.
a)
Chemical Change
b)
Physical Change
8.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
9.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
10.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
11.
What is the general word equation for a metal and acid reaction?
a)
metal + acid --> salt
b)
metal + acid --> salt + hydrogen
c)
metal + acid --> oxygen + hydrogen
d)
metal + acid --> oxygen + water
12.
How can the gas hydrogen be tested for?
a)
Relights a splint
b)
Limewater goes cloudy
c)
Squeaky pop test
d)
Puts out a lit flame
13.
Magnesium + Hydrochloric acid -->
a)
Magnesium hydride
b)
Sodium chloride
c)
Magnesium chloride
d)
Magnesium sulfate
14.
Which is NOT a characteristic of bases?
a)
forms hydroxide ions in solution
b)
is blue with most indicators
c)
reacts with water to dissociate into ions.
d)
has a low pH
15.
The name given to an acid-base reaction is
a)
ionization
b)
neutralization
c)
dissociation
d)
titration
16.
When an atom loses a valence electron, it becomes a(n) _____________ ion.
a)
positive
b)
negative
c)
neutral
d)
polyatomic
17.
Negative ions form when atoms _________ valence electrons.
a)
lose
b)
gain
c)
share
18.
The dense, positively charged mass located in the center of the atom.
a)
nucleus
b)
proton
c)
isotope
d)
molecule
19.
The __________ of an atom is the sum of the protons and neutrons in the nucleus of that atom.
a)
mass number
b)
atomic number
c)
atomic weuight
d)
isotope weight
20.
Which particle does not contribute mass to the atom?
a)
Proton
b)
Neutron
c)
Electron
d)
Nucleus
21.
Cations are
a)
negative ions
b)
gained electrons
c)
positive ions
d)
inner shell electrons
22.
Atoms are most stable when their outer shell is filled with electrons.
a)
true
b)
false
23.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
24.
Ionic bonds form between two ions that have
a)
ionic compounds
b)
negative charges
c)
positive charges
d)
opposite charges
25.
Where are metals located on the periodic table?
a)
Blue
b)
Green
c)
Red
100 %
