AnswersISP ONLY Chemistry S1 Q3000XXEvidence of Chemical Reactions

Evidence of Chemical Reactions Answers

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1
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How do balanced chemical equations show the conservation of mass?

A
They show that the atoms in the products may be different than the reactants as long as the mass does not change.
B
They show that the atoms in the products are the same as in the reactants, but the number of atoms must change.
C
They show that the number of atoms of each element is the same in the products and reactants.
2
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Which equation obeys the law of conservation of mass?

A
H2(g) + O2(g) → H2O(g)
B
H2(g) + O2(g) → H2O(g) +4He(g)
C
2H2(g) + O2(g) → 2H2O(g)
D
H2(g) → H2O(g)
E
H2(g) + O2(g) → 2H2O(g)
3

In level 3, you balanced the equation NH3 + O2 → NO2 + H2O. What number did you place in front of water?

A
2
B
4
C
5
D
6
4

In level 1, you balanced the equation N2 + H2 → NH3. What number did you place in front of ammonia (NH3)?

A
1
B
2
C
3
D
4
5

In level 2, you balanced the equation C + H2O → CH4 + CO2. What number did you place in front of carbon dioxide (CO2)?

A
1
B
2
C
3
D
4
6

Electrolysis breaks down water to form hydrogen and oxygen gas. The word equation that represents this reaction is: water

Question illustration
A
hydrogen + oxygen.
B
water + gas.
C
water.
7

A bright light is produced when magnesium reacts with the oxygen in air to form magnesium oxide. The word equation that represents this reaction is: magnesium + oxygen

Question illustration
A
magnesium.
B
magnesium oxide.
C
oxygen.
8

When methane burns, it reacts with oxygen to produce water and carbon dioxide. The word equation that represents this reaction is: methane + oxygen

Question illustration
A
hydrogen + carbon
B
gas + liquid
C
carbon dioxide + water
9

Propane burns in oxygen to produce carbon dioxide and water. What are the chemical formulas of the reactants and products?

A
The formulas of the reactants are C3H8, O, and CO2. The formula of the product is H2O.
B
The formulas of the reactants are C3H8 and O2. The formulas of the products are CO and H2O.
C
The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O.
10

What is the chemical equation for the burning of propane if all the products and reactants are in the gas phase?

A
4H2O(g) + 3CO2(g) + 5O2(g) → C3H8(g)
B
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
C
C3H8(g) + O10(g) → 3CO2(g) + 4H2O(l)
D
4H2O(l) + 3CO2(g) → C3H8(g) + 5O2(g)
11

What do the symbols tell you about the conditions of the reactions shown to the right? Check all of the boxes that apply.

A
The products and reactants of both reactions are gases.
B
Reaction 1 occurs at high pressure.
C
Reaction 2 makes a small amount of an additional product.
D
A catalyst is used for reaction 2.
12

What do the symbols tell you about the conditions of the reaction shown to the right? Check all of the boxes that apply.

A
The reaction only goes toward the products.
B
The reactant is dissolved in water.
C
A gas and a liquid are produced.
D
A solid precipitate will form.
13

solid sodium + chlorine gas → solid sodium chloride

Answer:

2 solid sodium + chlorine gas → solid sodium chloride

14

solid sodium + liquid water → aqueous sodium hydroxide + hydrogen gas

Answer:

4 solid sodium + liquid water → aqueous sodium hydroxide + hydrogen gas

15

2H2(g) + O2(g) → 2H2O(g)

Answer:

3 2H2(g) + O2(g) → 2H2O(g)

16

2H2O2(aq) → O2(g) + 2H2O(l)

Answer:

1 2H2O2(aq) → O2(g) + 2H2O(l)

17

How do balanced chemical equations show the conservation of mass?

A
They show that the atoms in the products may be different than the reactants as long as the mass does not change.
B
They show that the atoms in the products are the same as in the reactants, but the number of atoms must change.
C
They show that the number of atoms of each element is the same in the products and reactants.
18

Which equation obeys the law of conservation of mass?

A
H2(g) + O2(g) → H2O(g)
B
H2(g) + O2(g) → H2O(g) +4He(g)
C
2H2(g) + O2(g) → 2H2O(g)
D
H2(g) → H2O(g)
E
H2(g) + O2(g) → 2H2O(g)

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