When 3.00 grams of the anhydrous blue colored CoCl2 is exposed to moist air it forms 5.50 grams of the red-violet CoCl2 ∙ xH2O hydrate.Determine the number of moles of water that combine with one mole of CoCl2.

A) 4 B) 6 C) 8 D) 10 A) 4 B) 6 C) 8 D) 10

Exam 18: Hydrogen, oxygen, and Water

When 1.800 grams of anhydrous magnesium chloride were exposed to moist air,water was absorbed by the sample.If the resulting hydrated compound has a mass of 2.481 grams,what is the chemical formula of the hydrate?

(Multiple Choice)

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Question 61

An element that forms a covalent hydride tends to form an oxide that is ________ (acidic,basic).

(Short Answer)

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Question 62

In the reaction of ozone shown below,which of the following unbalanced half-reactions shows the species undergoing reduction and the reduced product? O₃(g)+ 2 I^-(aq)+ H₂O(l)→ O₂(g)+ I₂(s)+ 2 OH^-(aq)

(Multiple Choice)

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Question 63

Which of the following is a peroxide?

(Multiple Choice)

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Question 64

In the following pictures representing binary hydrides AH_x,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (3)is classified as

(Multiple Choice)

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Question 65

Write a balanced net ionic equation for the reaction of potassium with water.

(Multiple Choice)

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Question 66

Gas hydrates are solids in which a gas is encased in a polyhedral cage formed of water molecules.One gas hydrate structure has the general formula G_x(H₂O)₄₆.Xenon forms a gas hydrate having the composition 55.90% Xe,4.93% H,and 39.17% O.What is the value of x in the xenon gas hydrate Xe_x(H₂O)₄₆?

(Short Answer)

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Question 67

The direct methanol fuel cell (DMFC),a galvanic cell proposed for use in consumer products,employs the overall reaction shown below.How many liters of oxygen at 25°C and 1.00 atm are required to completely react with 0.641 g of CH₃OH? 2 CH₃OH(aq)+ 3 O₂(g)→ 2 CO₂(g)+ 4 H₂O(l)

(Short Answer)

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Question 68

When 3.00 grams of the anhydrous blue colored CoCl₂ is exposed to moist air it forms 5.50 grams of the red-violet CoCl₂ ∙ xH₂O hydrate.Determine the number of moles of water that combine with one mole of CoCl₂.

(Multiple Choice)

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Question 69

Which transition metal hydride is commonly used in the purification of hydrogen gas?

(Multiple Choice)

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Question 70

In the following pictures representing binary hydrides AH_x,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (1)is classified as

(Multiple Choice)

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Question 71

What is not a commercial method for the preparation of hydrogen gas?

(Multiple Choice)

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Question 72

An estimated 1.35 × 10¹⁸ m³ of water is present in the earth's oceans.Assuming water has a density of 1 g/mL then how many kilograms of water does this volume contain?

(Multiple Choice)

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Question 73

Of Na₂O,SO₂,and SO₃,equimolar aqueous solutions of would be most acidic and of would be most basic.

(Short Answer)

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Question 74

How many grams of H₂ gas can be produced by the reaction of 54.0 grams of Al(s)with an excess of dilute hydrochloric acid in the reaction shown below? 2 Al(s)+ 6 HCl(aq)→ 2 AlCl₃(aq)+ 3 H₂(g)

(Multiple Choice)

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Question 75

Dissolving 0.010 mole of which of the following in enough water to make 0.250 L of solution would result in a solution with the highest pH?

(Multiple Choice)

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Question 76

-Which element shown on the periodic table above forms a covalent binary hydride with the formula MX₄?

(Multiple Choice)

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Question 77

All of the following are reactions commonly associated with water except:

(Multiple Choice)

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Question 78

What is the bond length trend for molecular oxygen,the peroxide ion,and superoxide ion?

(Multiple Choice)

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Question 79

What are the three major chemicals that are commercially obtained from sea water?

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Question 80

Showing 61 - 80 of 175

Exam 18: Hydrogen, oxygen, and Water

When 1.800 grams of anhydrous magnesium chloride were exposed to moist air,water was absorbed by the sample.If the resulting hydrated compound has a mass of 2.481 grams,what is the chemical formula of the hydrate?

An element that forms a covalent hydride tends to form an oxide that is ________ (acidic,basic).

In the reaction of ozone shown below,which of the following unbalanced half-reactions shows the species undergoing reduction and the reduced product? O3(g)+ 2 I-(aq)+ H2O(l)→ O2(g)+ I2(s)+ 2 OH-(aq)

Which of the following is a peroxide?

In the following pictures representing binary hydrides AHx,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (3)is classified as

Write a balanced net ionic equation for the reaction of potassium with water.

Gas hydrates are solids in which a gas is encased in a polyhedral cage formed of water molecules.One gas hydrate structure has the general formula Gx(H2O)46.Xenon forms a gas hydrate having the composition 55.90% Xe,4.93% H,and 39.17% O.What is the value of x in the xenon gas hydrate Xex(H2O)46?

The direct methanol fuel cell (DMFC),a galvanic cell proposed for use in consumer products,employs the overall reaction shown below.How many liters of oxygen at 25°C and 1.00 atm are required to completely react with 0.641 g of CH3OH? 2 CH3OH(aq)+ 3 O2(g)→ 2 CO2(g)+ 4 H2O(l)

When 3.00 grams of the anhydrous blue colored CoCl2 is exposed to moist air it forms 5.50 grams of the red-violet CoCl2 ∙ xH2O hydrate.Determine the number of moles of water that combine with one mole of CoCl2.

Which transition metal hydride is commonly used in the purification of hydrogen gas?

In the following pictures representing binary hydrides AHx,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (1)is classified as

What is not a commercial method for the preparation of hydrogen gas?

An estimated 1.35 × 1018 m3 of water is present in the earth's oceans.Assuming water has a density of 1 g/mL then how many kilograms of water does this volume contain?

Of Na2O,SO2,and SO3,equimolar aqueous solutions of ________ would be most acidic and of ________ would be most basic.

How many grams of H2 gas can be produced by the reaction of 54.0 grams of Al(s)with an excess of dilute hydrochloric acid in the reaction shown below? 2 Al(s)+ 6 HCl(aq)→ 2 AlCl3(aq)+ 3 H2(g)

Dissolving 0.010 mole of which of the following in enough water to make 0.250 L of solution would result in a solution with the highest pH?

-Which element shown on the periodic table above forms a covalent binary hydride with the formula MX4?

All of the following are reactions commonly associated with water except:

What is the bond length trend for molecular oxygen,the peroxide ion,and superoxide ion?

What are the three major chemicals that are commercially obtained from sea water?

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In the reaction of ozone shown below,which of the following unbalanced half-reactions shows the species undergoing reduction and the reduced product? O₃(g)+ 2 I^-(aq)+ H₂O(l)→ O₂(g)+ I₂(s)+ 2 OH^-(aq)

In the following pictures representing binary hydrides AH_x,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (3)is classified as

The direct methanol fuel cell (DMFC),a galvanic cell proposed for use in consumer products,employs the overall reaction shown below.How many liters of oxygen at 25°C and 1.00 atm are required to completely react with 0.641 g of CH₃OH? 2 CH₃OH(aq)+ 3 O₂(g)→ 2 CO₂(g)+ 4 H₂O(l)

When 3.00 grams of the anhydrous blue colored CoCl₂ is exposed to moist air it forms 5.50 grams of the red-violet CoCl₂ ∙ xH₂O hydrate.Determine the number of moles of water that combine with one mole of CoCl₂.

In the following pictures representing binary hydrides AH_x,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (1)is classified as

An estimated 1.35 × 10¹⁸ m³ of water is present in the earth's oceans.Assuming water has a density of 1 g/mL then how many kilograms of water does this volume contain?

Of Na₂O,SO₂,and SO₃,equimolar aqueous solutions of would be most acidic and of would be most basic.

How many grams of H₂ gas can be produced by the reaction of 54.0 grams of Al(s)with an excess of dilute hydrochloric acid in the reaction shown below? 2 Al(s)+ 6 HCl(aq)→ 2 AlCl₃(aq)+ 3 H₂(g)

-Which element shown on the periodic table above forms a covalent binary hydride with the formula MX₄?