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WorksheetsPhy Sci, Monday Bell Ringer, 1.14.19
Total questions: 8
Worksheet time: 23mins
Name
Class
Date
1.
In a chemical equation, is it true that -
a)
the reactant side and product side can have different numbers of atoms for each element
b)
there can be different elements on the reactant side and the product side
c)
an element or compound must be accompanied by a phase change
d)
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
2.
What do the coefficients need to be in the following equation in order to be balanced?
_Mg + _Cl2 → _MgCl2
_Mg + _Cl2 → _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
3.
A reactant may be consumed in three ways:
a)
exothermic, endothermic, acid
b)
precipitate, weak acid, liquid
c)
precipitate, weak acid, gas
d)
liquid, weak acid exothermic
4.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
5.
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 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?
a)
One of the original compounds came out of solution
b)
The solutions reacted chemically
c)
Some of the water froze into ice crystals
d)
Rapid evaporation of water occurred, leaving a solid
6.
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)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
7.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
8.
How many Al atoms are in this compound? 4Al2O3
a)
2
b)
8
c)
6
d)
4
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