Unit 3 Chemical Reactions Review
Quiz by Janice Bixler
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- Q1
A lab group reacts sodium oxide (Na2O) with hydrochloric acid (HCl) to produce sodium chloride (NaCl) and water (H2O). When writing their lab report, they came up with the following equation to represent the reaction:
Na2O + HCl -> NaCl + H2O
Does this equation satisfy the Law of Conservation of Matter? Why or why not?
No, since there is a liquid and a solid as reactants, but a gas and a solid as a product.
Yes, since there is a subscript of 2 on both sides on the equation.
Yes, since there are 5 reactant atoms and 5 product atoms.
No, since there are two sodium atoms as reactants, but only one sodium atom as a product.
30sSPS3a - Q2
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
This is a __________ reaction and the product(s) is/are
decomposition; zinc chloride and water.
synthesis; zinc chloride and hydrogen gas.
double replacement; zinc chloride and hydrogen gas.
single replacement; zinc chloride and hydrogen gas.
30sSPS3b - Q3
Balance the equation: ______ Fe + _____ O2 --> ______Fe2O3
4,6,2
4,3,2
3,2,2
2,3,1
60sSPS3b - Q4
Match the example to type of reaction
Users link answersLinking60sSPS3a - Q5
Examine the following reaction, then identify the reactants and products:
C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)
Users sort answers between categoriesSorting45sSPS3a - Q6
Magnesium is a highly flammable element which is easily combustible in the presence of oxygen:
2Mg + O2 → ?? + heat
What is the unknown product?
MgO
Mg2O4
MgO2
2MgO
30sSPS3a - Q7
An antacid tablet was dropped in to plastic bag containing 10 ml at 22C distilled water. The bag was immediately zipped closed and the chemical reaction proceeded until completion. Cite evidence to confirm that this was a chemical reaction.
There was a color change.
The tablet disappeared.
There was a change in mass.
A gas was produced.
30sSPS3a - Q8
A student was adamant that a bag containing distilled water, and an antacid tablet lost mass. She argued that a solid had changed to a gas, thus a loss in mass. How would you respond to this student?
She is incorrect; the mass of the reactants equals the mass of the products.
She is correct; the mass of a solid plus water is more than a liquid plus gas.
She is correct; the gas is released from the bag resulting in less total mass.
She is correct; gasses have less mass than solids.
30sSPS3a - Q9
Sort according to balanced and unbalanced.
Users sort answers between categoriesSorting30sSPS3b