Review for Unit7 Chemical Reactions
Quiz
•
Chemistry
•
10th Grade
•
Medium
+2
Standards-aligned
Enos Inniss
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14 questions
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1.
MATCH QUESTION
1 min • 5 pts
What do these equation symbols mean?
gas
(l)
yields
(s)
dissolved in water
(aq)
solid
-->
liquid
(g)
2.
MATCH QUESTION
1 min • 5 pts
Correctly identify these polyatomic ions
SO42-
ammonium
NO2-
hydroxide
OH-
nitrite
NO3-
sulfate
NH4+
nitrate
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The reaction between solid aluminum and liquid bromine is exothermic. This reaction creates the product aluminum bromide. What equation includes the correct formulas and demonstrates conservation of mass?
Al(s) + Br₂(l) → AlBr₃(s)
Al(s) + Br(l) → AlBr(s)
Al(s) + 3Br(l) → AlBr₃(s)
2Al(s) + 3Br₂(l) → 2AlBr₃(s)
Answer explanation
solid aluminum is Al3+
liquid bromine is Br2
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Students perform an experiment that instantaneously forms a precipitate. They mix aqueous iron (III) nitrate and sodium hydroxide to produce iron (III) hydroxide and aqueous sodium nitrate. What is the correct balanced equation for this reaction to show conservation of mass?
3FeNO₃ + 2NaOH → FeOH₃ + 3NaNO₃
FeN + 3NaOH → FeOH₃ + 3NaN
Fe(NO₃)₃ + 3NaOH → Fe(OH)₃ + 3NaNO₃
Fe³⁺NO₃⁻ + Na⁺OH⁻ → Fe³⁺OH⁻ + Na⁺NO₃⁻
Answer explanation
iron (III) is Fe3+
nitrate is NO3-
sodium is Na+
hydroxide is OH-
Tags
NGSS.HS-PS1-2
NGSS.HS-PS1-7
5.
DRAG AND DROP QUESTION
1 min • 1 pt
What are the coefficients that would correctly balance this equation?
Zn + K₂CrO₄ ⟶ (a) K + (b) ZnCrO₄
Tags
NGSS.HS-PS1-7
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the reaction 2H₂ + O₂ → 2H₂O, what is the mole ratio of hydrogen to water?
2 : 2
2 : 1
1 : 2
4 : 4
Tags
NGSS.HS-PS1-7
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the reaction 2RbNO₃ → 2RbNO₂ + O₂, how many moles of O₂ are produced when 5.0 mol of RbNO₃ decompose?
1.0 mol
2.5 mol
3.0 mol
7.5 mol
Answer explanation
Based on the balanced equation
2RbNO₃ → 2RbNO₂ + O₂
the molar ratio of RbNO₃ to O₂ is 2:1 which means that every 1 mole of RbNO₃ will produce 0.5 moles of O₂
Tags
NGSS.HS-PS1-7
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