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Exam 18: Hydrogen, oxygen, and Water

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Question 61

Multiple Choice

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What is the oxidation number of oxygen in KO₂?

A) 0
B) -1/2
C) -1
D) -2

E) A) and D)
F) B) and D)

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Question 62

Multiple Choice

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The first step in the steam-hydrocarbon re-forming process is shown below. H₂O(g) + CH₄(g) → CO(g) + 3 H₂(g What is the change in oxidation number of the atom undergoing oxidation in this reaction?

A) - 2
B) + 1
C) + 2
D) + 6

E) A) and C)
F) B) and C)

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Question 63

Multiple Choice

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In the picture representing binary hydride AH_x,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A.The oxidation state of hydrogen and the oxidation state of element A in the binary hydride shown below are

At 25°C the dissociation constant K_w for T₂O is 0.06 × 10^-14.What is the molar concentration of OT^- in 0.025 M TCl?

What is the anhydrous form of nitric acid,HNO₃?

When 3.600 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 4.962 grams,what is the chemical formula of the hydrate?

A binary compound that forms when potassium reacts with oxygen has the composition 58.96% Na and 41.04% O.What is the formula of one formula unit of this compound?

Binary hydrides can be classified as covalent,ionic,or metallic.NaH,HCl,and NH₃ are classified as ________,________,and ________ binary hydrides,respectively.

Binary oxides can be classified as acidic,amphoteric,or basic.MgO,Al₂O₃,and SO₃ are classified as ________,________,and ________ oxides,respectively.

A reaction occurs when 0.2105 g of CaH₂ is dissolved in enough water to make 250 mL of solution.This solution will have a pH = ________.

The preparation of oxygen by the thermal decomposition of potassium chlorate is shown below. 2 KClO₃(s) 2 KCl(s)+ 3 O₂(g) In this reaction the atom that is reduced is ________,which undergoes an oxidation number change from ________ to ________.

Indicate the order of reactivity of the halogens (F₂,Cl₂,Br₂,I₂) with water (fastest to slowest) .

When 0.500 grams of CuSO₄ ∙ 5H₂O is heated at a temperature of 300°C for twenty minutes it loses some water of hydration.If the resulting sample weighs 0.427 grams then what is the formula of the compound?

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

The strongest force that must be overcome in order to melt LiH,SiH₄,H₂S,and HF is ________,________,________,and ________,respectively.

Which is an ionic binary hydride?

How many grams of KCl(s) are produced from the thermal decomposition of KClO₃(s) which produces 25.0 mL of O₂(g) at 25°C and 1.00 atm pressure according to the chemical equation shown below? 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

Anhydrous magnesium sulfate can be used as a drying agent to remove moisture from the atmosphere.If the only product of this reaction is magnesium sulfate heptahydrate,how many grams of water can be removed by 0.500 kg of magnesium sulfate?

Differences in the physical properties of H₂O and D₂O are due to isotope effects.Which comparison is not correct? Compared to H₂O,D₂O has a higher

The strongest homonuclear single bond is