3.4 Review
Quiz by TIFFANY SOLOT
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- Q1
In a chemical equation, is it true that -
the reactant side and product side can have different numbers of atoms for each element
there can be different elements on the reactant side and the product side
an element or compound must be accompanied by a phase change
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
30s - Q2
Which of the following models best demonstrates a balanced chemical equation?
J
F
G
H
30s - Q3
The reactants are on the left side of the chemical equation.
True
False
30s - Q4
Two clear colorless solutions were combined. The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
The solutions reacted chemically
Some of the water froze into ice crystals
Rapid evaporation of water occurred, leaving a solid
One of the original compounds came out of solution
30s - Q5
How many atoms in all are in a molecule of serotonin?
C10H12N2O
25
4
22
24
30s - Q6
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
A new substance is produced
Coal is made up of more than one element
The shape of the coal changes
Oxygen is present
30s - Q7
Which of the following BEST describes a chemical reaction?
Molecules move faster until they fly apart from each other
Existing bonds break, atoms are rearranged, and new bonds form
Atoms break apart into even smaller particles.
A compound is crushed into a fine powder.
30s - Q8
In a ___________change, a substance changes into a different substance
Chemical
Physical
30s - Q9
Which of these is NOT a sign that a chemical change has occurred?
An unexpected color change
change in state of mater
The formation of a precipitate
A temperature change
30s - Q10
The Law of Conservation of Mass states
that matter exists in the same state throughout any chemical change
that matter can only be changed into new substances by introducing a catalyst
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
that matter exists in all states and reacts the same
30s - Q11
How many F atoms are in this compound?
6MgF2
2
12
8
6
30s - Q12
An gel ice pack getting cold after you put it in the freezer for an hour.
Physical change
Chemical change
30s - Q13
Which of the following IS a physical change?
Rusty metal
Getting a haircut
baking bread
sour milk
30s - Q14
___________________ are the elements or compounds that leave (are formed in) a chemical reaction.
Bonds
Polymers
Reactants
Products
30s - Q15
Is the equation 4Fe2 + 3O2 -----> 2Fe2O3 balanced?
no
yes
30s
