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WorksheetsChemistry of Materials
Total questions: 20
Worksheet time: 20mins
Which of the following is a chemical property of a substance? The substance______________.
conducts electricity
reacts with hydrochloric acid
scratches glass
is more dense than water
Which of the following is a list of physical properties?
density, conductivity, reaction with acid
flexibility, reaction with hydrochloric acid, color
temperature change when a chemical is added, texture, density
electrical conductivity, hardness, ability to transmit light
What happens to a molecule’s atoms during a chemical reaction?
The atoms are destroyed
New atoms form
The atoms are rearranged and join to different atoms
The atoms bubble and fizz
Which of the following are signs of a chemical reaction? (choose all correct answers)
color change
a precipitate (solid) forms in a liquid
dissolving
freezing
What does a chemical reaction do to the substances’ properties?
the properties change and the new substance that forms has new properties
nothing happens to the properties
nobody knows what happens
How many ELEMENTS are in one molecule of sulfuric acid?
(see chemical formula above)
2
3
6
7
Which of the following describes elements ? (choose all correct answers)
the atoms are all the same
all elements are found in the periodic table
at least two types of atoms must join together
most are made in laboratories
What do you call the substances you have before a reaction starts?
reactants
liquids
products
Which property places Hydrogen in the 1st column (family)?
It is a gas at room temperature
It combines with Chlorine (Cl) in the same ration as sodium (Na).
It forms diatomic molecules
None of the above.
How many elements are on the reactant side of the following equation: CH4 + 2O2 -> CO2 + 2H2O
9
7
3
4
How many total atoms are on the reactant side of the following equation: CH4 + 2O2 -> CO2 + 2H2O
9
7
3
4
When water (a compound) is broken down, you are able to separate it into hydrogen gas and oxygen gas. How would you classify the products?
a molecule of hydrogen and a molecule of oxygen
an atom of hydrogen and an atom of oxygen
a molecule of hydrogen and an atom of oxygen
an atom of hydrogen and a molecule of oxygen
H2 + O2 -> H2O is an example of what type of reaction?
Decomposition
Synthesis
Combustion
Single Displacement
Zn + CuCl2 -> ZnCl2 + Cu is an example of what type of reaction?
Synthesis
Double displacement
Single Displacement
Combustion
You leave a bucket of water outside, the next day you notice that some of the water is gone. Which statement best describes what happened?
A chemical change occurred and formed a new substance
A physical change occurred when the water evaporated away
A substance (S1) is heated and results in the formation of 2 gases (G1 and G2). All of the substances are classified as pure substances. Which must be a compound?
G1 and G2
G1 only
S1 only
S1 and G2
Jojo runs 4 trials of her experiment. This is an example of..
Repetition
Replication
Which if the following is the best explanation of replication?
When a scientist conducts their own experiment
When another scientist reproduces a scientist's experiment
When another scientist reproduces another's results
When a scientist conducts another's experiment to make sure it is valid
What is the difference between a theory and a law?
A law explains a natural event, while a theory describes it.
A law describes a natural event, while a theory explains it
A law predicts a natural event, while a theory explains it
A law describes a natural event, while a theory predicts it
The addition of an base indicator causes the solution to turn from clear to pink. Which of the following explains why?
The solution is basic
The solution has a higher amount of hydroxide (OH-) ions
There has been a change in pH
All are possible
