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Unit 2
Test Description: Balancing equations and identifying reaction types, phases of matter, gas laws, solutions, and acids and bases
Instructions: Answer all questions to get your test result.
1) CuS + KCl-CuCl2 +K2S What coefficient of KCl will balance this equation?
A
2
B
1
C
4
D
3
2) Fe + O2 -Fe2O3 What are the coefficients of Fe, O2, and Fe2O3 ?
A
2, 1, 2
B
2, 3, 2
C
4, 3, 2
D
4, 1, 2
3) What type of chemical reaction is S8(s) + 8 O2 (g) - 8 SO2 (g)
A
decomposition
B
synthesis
C
double replacement
D
single replacment
4) Which equation is balanced?
A
2 Na + 2 H2O - NaOH + H2
B
H2 + O2 - H2O
C
NaOH + MgCl2 - NaCl + MgOH
D
Mg + Cl2 - MgCl2
5) AgNO3 + KBr - AgBr + KNO3 What type of reaction is this?
A
decomposition
B
single replacement
C
synthesis
D
double replacement
6) Which of these represents a properly balanced equation?
A
N2H4 + N2O4 - N2 + H2O
B
2 N2H4 + N2O4 - 2 N2 + 4 H2O
C
2 N2H4 + N2O4 - 3 N2 + 4 H2O
D
2 N2H4 + 3 N2O4 - 5 N2 + 6 H2O
7) A balanced chemical equation reflects the idea that the mass of the products____
A
Equals the mass of the reactants
B
Is not related to the mass of the reactants
C
Is less than the mass of the reactants
D
Is greater than the mass of the reactants
8) Which of the following chemical reactions is a decomposition reaction?
A
BaCO3 - BaO + CO2
B
3 Br2 + 2 FeI3 - 2 FeBr3 + 3 I2
C
2 Ca + O2 - 2 CaO
D
MgCl2 + H2SO4 - MgSO4 + 2HCl
9) What type of reaction is represented by this equation? NaCl + F2 - NaF + Cl2
A
single replacement
B
double replacment
C
decomposition
D
synthesis
10) When a spray can is thrown onto a fire, it soon explodes. Which statement best describes why this occurs?
A
The molecules undergo chemical reactions
B
The molecules gain more energy and hit the walls of the can more often
C
The molecules lose energy, which causes the volume to change rapidly
D
The molecules expand, getting bigger until the container explodes
*select an answer for all questions
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