Unit 2 Question Preview (ID: 49147)


Balancing Equations And Identifying Reaction Types, Phases Of Matter, Gas Laws, Solutions, And Acids And Bases. TEACHERS: click here for quick copy question ID numbers.

When a spray can is thrown onto a fire, it soon explodes. Which statement best describes why this occurs?
a) The molecules gain more energy and hit the walls of the can more often
b) The molecules expand, getting bigger until the container explodes
c) The molecules undergo chemical reactions
d) The molecules lose energy, which causes the volume to change rapidly

What type of reaction is represented by this equation? NaCl + F2 - NaF + Cl2
a) synthesis
b) decomposition
c) single replacement
d) double replacment

Which of the following chemical reactions is a decomposition reaction?
a) BaCO3 - BaO + CO2
b) 2 Ca + O2 - 2 CaO
c) 3 Br2 + 2 FeI3 - 2 FeBr3 + 3 I2
d) MgCl2 + H2SO4 - MgSO4 + 2HCl

A balanced chemical equation reflects the idea that the mass of the products____
a) Is greater than the mass of the reactants
b) Is less than the mass of the reactants
c) Equals the mass of the reactants
d) Is not related to the mass of the reactants

AgNO3 + KBr - AgBr + KNO3 What type of reaction is this?
a) synthesis
b) decomposition
c) single replacement
d) double replacement

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

What type of chemical reaction is S8(s) + 8 O2 (g) - 8 SO2 (g)
a) synthesis
b) decomposition
c) single replacment
d) double replacement

Which equation is balanced?
a) NaOH + MgCl2 - NaCl + MgOH
b) Mg + Cl2 - MgCl2
c) H2 + O2 - H2O
d) 2 Na + 2 H2O - NaOH + H2

Fe + O2 -Fe2O3 What are the coefficients of Fe, O2, and Fe2O3 ?
a) 2, 1, 2
b) 2, 3, 2
c) 4, 1, 2
d) 4, 3, 2

CuS + KCl-CuCl2 +K2S What coefficient of KCl will balance this equation?
a) 1
b) 2
c) 3
d) 4

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