Chemistry Year 7 12/12
A chemical combination of two or more atoms is a(n)
a.
volume
b.
molecule
c.
chemical bond
d.
isotope
.
One molecule of water, H2OH2O, always contains two hydrogen atoms
and
oxygen atom(s).
a.
one
b.
two
c.
zero
d.
three
When
a.
b.
c.
d.
two or more elements combine chemically, they form a(n)
lipid
atom
element
compound
The smallest particle of an element is a(n)
a.
atom
b.
molecule
c.
DNA
.
The change in state from a liquid to a solid is known as
a.
melting
b.
boiling
c.
freezing
.
The change from the liquid to the gas state of matter is known as
a.
freezing
b.
vaporization
c.
melting
a.
b.
c.
d.
is anything that has
Matter, mass
Mass, matter
Atom, mass
Proton, matter
and takes up space.
Carbon has a mass number of 12. Thus, it has
and
neutrons.
a.
6, 6
b.
12, 12
c.
6, 12
d.
12, 6
.
protons
.
Chemistry Year 7 12/12
A state of matter that has a definite volume but has no definite shape is
a
.
a.
liquid
b.
solid
c.
gas
What
a.
b.
c.
d.
simple sugar is made during photosynthesis?
water
glycerine
hydrogen
glucose
A neutral atom becomes a positive ion when it
a.
gains an electron.
b.
gains a proton.
c.
loses an electron.
d.
loses a proton.
In which direction do periods go on the Periodic Table?
a.
up and down
b.
across the table
c.
from the corners
d.
down
In a mixture, substances
a.
keep their own properties.
b.
have a definite chemical composition.
c.
lose their original properties.
d.
combine chemically.
A chemical change
.
a.
always can be reversed
b.
never will change state
c.
never can be reversed
d.
cannot be reversed easily
An ion of the element carbon has a different number of
a.
protons
b.
electrons
c.
neutrons
d.
all of the above
What
a.
b.
c.
group contains the noble gases?
19
18
17
.
Chemistry Year 7 12/12
d.
16
A mixture in which the parts appear to be the same throughout is
a(n)
.
a.
mixture
b.
homogeneous mixture
c.
pure substance
d.
computer
How many rows and columns are on the Periodic Table of elements?
a.
7 rows, 18 columns
b.
7 rows, 20 columns
c.
10 rows, 30 columns
d.
9 rows, 19 columns
are large molecules that are made of amino acids. These molecules
are important building blocks for living things.
a.
Proteins
b.
Carbohydrates
c.
Monomers
d.
Chloroplasts
The color of your clothes is a(n)
a.
chemical property
b.
physical property
c.
isotope property
d.
molecular property
.