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WorksheetsUnit 1 Chemistry Pre-Test
Total questions: 44
Worksheet time: 3hrs 52mins
Which is an accurate model of CH4?
Model #1
Model #2
Model #3
Model #4
If a substance changes color or smell, it is most likely due to a PHYSICAL change.
True
False
If a substance changes its state of matter, it is going through a CHEMICAL change
True
False
During a chemical reaction, all matter is conserved.
True
False
What is modeled in the picture?
An element
A compound
A mixture of a compound and element
A mixture of two elements
The solution below is...
An Element
A compound
A mixture of element and element molecules
A mixture of two elements
The solution below is...
An element
A compound
A mixture of a compound and a element
A mixture of two compounds
The solution below is...
An element
A compound
A mixture of a compound and a element
A mixture of two compounds
The solution below is...
An element
A compound
A mixture of a compound and a element molecule
A mixture of two compounds
The solution below is...
An element molecule
A compound
A mixture of a compound and a element
A mixture of two elements
How many electrons are in a Beryllium atom?
9
5
6
4
What is the atomic number of Beryllium?
4
6
9
5
How many neutrons are in a Beryllium atom?
4
6
5
9
What aspect of the periodic table will tell you valence electrons?
Groups
Families
Transitions
Periods
The symbol for Iron is
Ir
Fe
I
On
Periods on the periodic table tell you.
Valence Electrons
Amount of Orbitals
Electronegativity Only
Size of the atom Only
The atomic number tells you what?
number of electrons
number of protons
number of neutrons
both electrons and protons in an atom.
How many MOLECULES are in the following compound: CaCO3
1
3
5
0
Evidence of a chemical reaction is anything that shows
a new substance has formed
a solid dissolved in a liquid
interaction between 2 gases
a change in the state of matter
One of the signs of a chemical reaction taking place is:
Bubbles are produced
Reactants are not combining
Products are not forming
Color is not changing
Which of the following describes a precipitate?
a liquid forms when a block of metal is heated
a solid forms when one liquid is poured into another
a gas forms when a solid is placed in a liquid
bubbles form when an acid is poured on a rock
Which is NOT an indication of a chemical change?
temperature change
formation of a precipitate
shape change
production of light
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -
could show that a gas is forming.
always rise to the top of a liquid.
are almost always perfectly spherical.
usually burst after a few minutes.
Which of the following is an example that includes evidence of a chemical reaction?
A sample of zinc is placed in water and it settles to the bottom
A solid block of ice is heated and it completely melts into a liquid.
Sugar that is burned gives off an odor and turns brown and then black.
A tomato is placed into a blender and chopped up into smaller pieces.
Jonathan places a pot of water on a stove. As the water boils, how does the state of the water change?
from gas to liquid
from liquid to gas
from liquid to solid
from solid to liquid
Matter changes state when...
energy is added or removed
energy is added
energy is removed
there is no energy
The particles in water move fastest in water that is _______________.
boiling
frozen
liquid
melting
When thermal energy is decreased in a liquid, what change in state is happening?
Melting
Freezing
Condensation
Evaporation
When thermal energy is increased in a solid, what change in state is happening?
Melting
Evaporation
Freezing
Condensation
What is the chemical formula for the molecule shown here?
NH
HN3
NH3
N3H3
Which state of matter would a bulk substance with this composition probably be found in?
solid
liquid
gas
plasma
H2O is most accurately described as a ___________________.
molecule
compound
element
atom
