AnswersAA-F26 Physical ScienceDescribing Chemical Reactions

Describing Chemical Reactions Answers

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Leslie incorrectly balances an equation as 2C4H10 + 12O2 → 8CO2 + 10H2O.

A
2
B
8
C
10
D
12
2
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In a process called photosynthesis, plants use carbon dioxide and water, along with energy from sunlight, to produce sugar and oxygen. Photosynthesis is represented by the equation

Question illustration
A
6 molecules of CO2
B
6 molecules of H2O
C
18 molecules of CO2
D
24 molecules of H2O
3

Rust results from iron’s reaction to oxygen. An iron nail gains mass when it rusts. How does this reaction support the law of conservation of mass?

A
The mass of the rusted nail equals the mass of iron and the oxygen from the air it reacted with to form the rust.
B
The mass of the rusted nail increases because iron attracts more protons from the air.
C
The increased mass of the rusted nail is an exception to the law of conservation of mass since the rusted nail’s mass increases.
D
The increased mass of the rusted nail results from the rearrangement of protons and neutrons within oxygen, according to the law of conservation of mass.
4

Franklin was performing an experiment by combining hydrochloric acid and sodium hydroxide. He measured the mass of his reactant materials to be 35g. The reaction resulted in the production of salt and water. He reported that his products weighed 32g.Which best describes the results of Franklin’s experiment?

A
No error occurred, some of the products are always lost as heat.
B
An error occurred, the mass of the reactants should equal the mass of the products.
C
An error occurred, the products should weigh more than the reactants.
D
No error occurred, water is not weighed when determining the weight of the products.
5

Which is the correctly balanced equation for the reaction of rust, Fe2O3, and hydrochloric acid, HCl?

A
Fe2O3 + HCl → FeCl3 + H2O
B
Fe2O3 +3 HCl → 2 FeCl3 + H2O
C
Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O
D
Fe2O3 + 3 HCl → 2 FeCl3 + 3 H2O
6

Which additional product balances the reaction H2SO4 + 2NaOH → Na2SO4 + ________?

A
2H2O
B
2OH
C
H2O2
D
H3O
7

The product side of a chemical reaction is shown.→ 7Ti2(SO4)3

A
2
B
3
C
4
D
7
8

In the product 6O2, what does the coefficient mean?

A
There are 12 molecules of O2,
B
There are 8 molecules of O2,
C
There are 6 molecules of O2.
D
There are 2 molecules of O2.
9

The expression CaCO3 → CaO + CO2 is an example of a

A
reactant.
B
product.
C
chemical equation.
D
chemical progression.
10

For the equation 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O, how many units of NO3 are represented on the products side?

A
2
B
3
C
6
D
8

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