Deck 3: Molecules Moles Chemical Equations

Question 1

Which of the following statements is not true.

A) Biomass is formed in the conversion of CO₂ and water into sugars.
B) The potential energy in biomass can be transformed into mechanical usages.
C) Biomass is a renewable practice
D) The breakdown of sugars releases H₂

Answer 1

The breakdown of sugars releases H₂

Question 2

The correct physical state subscript for substances dissolved in water is _(w).

Answer 2

False

Question 3

The greatest challenge facing biomass for energy needs is:

A) the creation of sugars from carbon dioxide and water
B) finding the means to tranform the biomass energy into a sufficient energy density
C) production of fixed nitrogen
D) soil quality

Answer 3

finding the means to tranform the biomass energy into a sufficient energy density

Question 4

The potential of biomass is related to the enormous amounts of solar energy impinging on the Earth each second.

Question 5

Silver chloride is a soluble salt.

Question 6

Given that: AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃ (aq) , which of the following species is classified as a spectator ion?

A) Ag¹⁺ (aq)
B) NO₃^{1 −} (aq)
C) AgCl (s)
D) Cl^{1 −} (aq)

Question 7

Potassium permanganate is a soluble salt.

Question 8

There are eight oxygen atoms in one molecule of calcium phosphate.

Question 9

Given that: CaCl₂ (aq) + NaHCO₃ (aq) → CaCO₃ (s) + NaCl (aq) + HCl (aq) , which of the following species is classified as a spectator ion?

A) Na¹⁺ (aq)
B) CO₃^{2 −} (aq)
C) CaCO₃ (s)
D) Ca²⁺ (aq)

Question 10

This reaction: C₇H₁₆ + 11 O2 → 7 CO₂ + 8 H₂O represents the complete combustion of heptane.

Question 11

Given that: 2 H₂( g ) + O₂( g ) → 2 H₂O( g ), four moles of hydrogen should react with appropriate oxygen to produce 2 moles of water.

Question 12

Acids and bases react to give noxious gases and oxides

Question 13

The Law of Conservation of Matter can be interpreted correctly to mean that atoms of one element are neither created nor destroyed in a chemical reaction.

Question 14

In the aqueous phase reaction between KCl and AgNO₃, the following statement is true:

A) 1.0 mole of KCl and 2.0 moles of AgNO₃ react without excess remaining
B) Two moles of KCl with excess AgNO₃ will form four moles of AgCl
C) These two compounds react to form solid AgCl, K¹⁺, and NO₃^{1 −}
D) Chloride is a spectator ion

Question 15

A solution of 2.5 M Ba²⁺ can be prepared by dissolving 583 grams of barium sulfate in one liter of water.

Question 16

Sodium nitrate is a strong electrolyte.

Question 17

Chemical equations are written to express the products of a reaction.

Question 18

Thirty moles of hydrogen and 14 moles of oxygen should react to produce 252 grams of water and 2 grams of hydrogen.

Question 19

Barium sulfate is a strong electrolyte

Question 20

Spectator ions do not participate in a chemical reaction.

Question 21

Which of the following illustrates the balanced reaction of iron and oxygen to form iron (II) oxide?

A) Fe (s) + O (g) → FeO (s)
B) Fe₂ (s) + O (g) → Fe₂O (s)
C) 2Fe (s) + O₂ (g) → 2FeO (s)
D) 4Fe (s) + 3O₂ (g) → 2Fe₂O₃ (s)

Question 22

How many aluminum atoms are present in 4 molecules of AlCl₃?

A) 1
B) 3
C) 4
D) 12

Question 23

Which of the following substances is an example of a weak electrolyte?

A) NaCl
B) Mg(NO₃)₂
C) KClO₃
D) CH₃COOH

Question 24

If 225.6 grams of silver chloride are produced in a precipitation reaction, how many moles of the salt have been formed?

A) 1.574 × 10⁰
B) 4.403 × 10¹
C) 1.039 × 10¹
D) 9.471 × 10 ^{− 1}

Question 25

How many helium atoms are present in 3.0 × 10 ⁻² moles of the gas?

A) 5.6 × 10²¹
B) 1.8 × 10²²
C) 4.5 × 10²¹
D) 1.2 × 10 ^{− 26}

Question 26

In the reaction between Fe and CuCl₂, the following statement is true:

A) One mole of Fe and two moles of CuCl₂ react without excess remaining
B) Two moles of Fe with excess CuCl₂ will plate one mole of Cu
C) These two compounds react to form solid FeCl₃ and Cu²⁺
D) Chloride is a spectator ion

Question 27

In the reaction between Ba(NO₃)₂ and Na₂SO₄, the following statement is true:

A) 2.0 mole of Ba(NO₃)₂ and 4.0 moles of Na₂SO₄ react without excess remaining
B) Two moles of Ba(NO₃)₂ with excess Na₂SO₄ will form two moles of BaSO₄
C) These two compounds react to form solid NaNO₃, Ba²⁺, and SO₄^{2 −}
D) Sulfate is a spectator ion

Question 28

If the solubility of NaCl in water is 35.7g NaCl / 100g H₂O, what is the minimal volume of water needed to dissolve 100 grams of the salt?

A) 36 mL
B) 140 mL
C) 280 mL
D) 661 mL

Question 29

Which of the following substances is an example of a strong electrolyte?

A) sucrose
B) table salt
C) asphalt
D) corn starch

Question 30

Which of the following illustrates the balanced reaction between magnesium and oxygen to form magnesium oxide?

A) Mg (s) + O (g) → MgO (s)
B) 2 Mg (s) + O₂ (g) → 2 MgO (s)
C) Mn (s) + O (g) → MnO (s)
D) 2 Mn (s) + O₂ (g) → 2 MnO (s)

Question 31

A "neon" sign contains 2.4 × 10² mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?

A) 6.5 × 10²¹
B) 2.8 × 10²²
C) 3.2 × 10²⁴
D) 9.9 × 10 ^{− 23}

Question 32

How many oxygen atoms are present in 6 molecules of Ce(NO₂)₃?

A) 6
B) 18
C) 36
D) 54

Question 33

Which of the following may be classified as an example of an acid-base reaction?

A) HCl + NaOH → H₂O + NaCl
B) Ca(NO₃)₂ + H₂SO₄ → CaSO₄ + HNO₃
C) KClO₄ + NaF → NaClO₄ + KF
D) HCOOH + NH₄Cl → NH₄COOH + HCl

Question 34

Which of the following illustrates the balanced reaction of ethyl alcohol with an excess of oxygen to form carbon dioxide and water?

A) C₂H₅OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 3 H₂O (l)
B) 3 C₂H₅OH (l) + 7 O₂ (g) → 6 CO₂ (g) + 9 H₂O (l)
C) C₂H₅OH (l) + 2 O₂ (g) → 3 CO₂ (g) + 3 H₂O (l)
D) 3 C₂H₅OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 6 H₂O (l)

Question 35

How many oxygen atoms are present in 5 molecules of CuSO₄ 5H₂O?

A) 45
B) 50
C) 25
D) 20

Question 36

Which of the following substances is an example of a strong electrolyte?

A) C₆H₁₂O₆
B) KNO₃
C) Ag₂SO₄
D) C₄H₁₀

Question 37

87.2 grams of IrCl₃ contains ____ moles of the compound.

A) 7.65
B) 3.41
C) 0.0819
D) 0.292

Question 38

Given that: Pb(ClO₃)₂ (aq) + KBr (aq) → PbBr₂ (s) + KClO₃ (aq) , which of the following species is classified as a spectator ion?

A) Pb²⁺ (aq)
B) ClO₄^{1 −} (aq)
C) K¹⁺ (aq)
D) Br^{1 −} (aq)

Question 39

Which of the following equations best illustrate the net ionic equation for the reaction of radium chloride with potassium sulfate?

A) RaCl₂ + K₂SO₄ → RaSO₄ + 2 KCl
B) Ra²⁺ (aq) + 2 Cl^{1 −} (aq) + 2 K¹⁺ (aq) + SO₄^{2 −} (aq) → RaSO₄ (s) + 2 Cl^{1 −} (aq) + 2 K¹⁺ (aq)
C) Ra²⁺ (aq) + SO₄^{2 −} (aq) → RaSO₄ (s)
D) Ra²⁺ (aq) + 2 Cl^{1 −} (aq) + 2 K¹⁺ (aq) + SO₄^{2 −} (aq) → RaSO₄ (s) + 2 KCl (aq)

Question 40

How many atoms are contained in 5.99 × 10 ^{− 14} moles of glucose (C₆H₁₂O₆)?

A) 2.42 × 10³⁸
B) 8.66 × 10¹¹
C) 1.84 × 10²¹
D) 3.61 × 10¹⁰

Question 41

What volume of a 1.00 M HCl solution is required to create 200 mL of a 0.250 M HCl solution?

A) 30.0 mL
B) 50.0 mL
C) 60.0 mL
D) 75.0 mL

Question 42

If 92.8 grams of sodium nitrite is dissolved in sufficient water to prepare 2.3 L of water, the resulting solution has a molarity of:

A) 1.34 M
B) 0.890 M
C) 0.58 M
D) 1.92 M

Question 43

An unknown hydrocarbon is subjected to elemental analysis. The results of this test show that the compound is 83.24% carbon and 16.76% H. With a molar mass of 72 g/mole, the molecular formula of this compound is:

A) C₄H₁₀
B) C₅H₁₀
C) C₅H₁₂
D) C₆H₁₄

Question 44

A 118.63 g of SrCl₂ ∙ 6H₂O contains ____ molecules of strontium nitrate

A) 2.680 × 10²³
B) 1.346 × 10²⁴
C) 5.540 × 10²³
D) 6.224 × 10 ^{− 24}

Question 45

A 6.55 × 10 ^{− 3} M solution of Cd(NO₃)₂ can be made by dissolving ____ grams of the salt in sufficient water to make 500 mL of the solution.

A) 0.991
B) 1.549
C) 0.585
D) 0.774