Given the following data: ΔH ○ f [FeO(s)] = –270kJmol –1 ΔH ○ f [Fe 2 O 3 (s)] = –820 kJ mol –1 Select the expression which gives the enthalpy change, in kJ mol –1 , for the reaction: 2FeO(s) + 1⁄2O 2 (g) → Fe 2 O 3 (s)

(–820 × 1⁄2) + 270 = –140

Which statement is FALSE for an exothermic reaction?

Reactants have stronger bonds than products

Reactants higher in energy and less stable

Product lower in energy and more stable

Products have stronger bonds than reactants

C 2 H 4 (g) + H 2 (g) -> C 2 H 6 (g) ∆H°=-137 kJ mol -1 Which statement about this information is correct?

The total energy of the bonds broken in the reactants is less than the total energy of the bonds formed in the product

The total energy of the bonds broken in the reactants is greater than the total energy of the bonds formed in the product

The bonds broken and the bonds made are of the same strength

No conclusion can be made about the sums of the bond enthalpies in the product compared with the reactants

Which statement is true regarding endothermic reactions?

Temperature change is negative and enthalpy change is positive

Temperature change is positive and enthalpy change is positive

Temperature change is positive and enthalpy change is negative

Temperature change is negative and enthalpy change is negative

Water has a specific heat capacity of 4.184, and wood has a specific heat capacity of 1.760. Which would require more energy to raise the temperature 1ºC?

They would use the same amount of energy

f two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____

they both have an equal temperature

one reaches a temperature of zero

There are 2 beakers of water, one has 100 mL in it and one has 1000mL. You add 4000 joules of energy, which one has the bigger change in temperature?

They are the same material so they both heat to the same temperature

That is not enough energy to heat water

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Exam 4 Review

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MULTIPLE CHOICE QUESTION

10 mins • 1 pt

Quinone, which is used in the dye industry and in photography, is an organic compound containing only C, H, and O. What is the empirical formula of the compound if you find that 0.105 g of the compound gives 0.257 g of CO₂ and 0.0350 g of H₂O when burned completely?

CHO

C₂H₁₀

C₃H₂O

C₆H₄O₂

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NGSS.HS-PS1-7

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

A 0.2500 g sample of a compound known to contain carbon, hydrogen and oxygen undergoes complete combustion to produce 0.3664 g of CO₂ and 0.1500 g of H₂O. What is the empirical formula of this compound?

CH₂O

CHO

COH₃

C₂H₄O

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Exam 4 Review

35 questions

B₂H₆ + 3 O₂→ 2 HBO₂ + 2 H₂O
What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

2Na + 2H₂O → 2NaOH + H₂
How many grams of hydrogen are produced if 120 g of Na are available?

SO₂+ PCl₅→ SOCl₂+ POCl₃
How many grams of SOCl₂is produced when 16.2g SO₂react with 13.7g PCl_5?

Cl₂ + 2 KBr → Br₂ + 2 KCl
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?

Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe₂O₃ are formed when 16.9g of Fe reacts completely with oxygen?
4Fe_(s)+3O₂→2Fe₂O_3(s)

Quinone, which is used in the dye industry and in photography, is an organic compound containing only C, H, and O. What is the empirical formula of the compound if you find that 0.105 g of the compound gives 0.257 g of CO₂ and 0.0350 g of H₂O when burned completely?

A 0.2500 g sample of a compound known to contain carbon, hydrogen and oxygen undergoes complete combustion to produce 0.3664 g of CO₂ and 0.1500 g of H₂O. What is the empirical formula of this compound?

Vanillin, a flavoring agent, is made up of carbon, hydrogen, and oxygen atoms. When a sample of vanillin weighing 2.500g burns in oxygen, 5.79 g of carbon dioxide and 1. 18 g of water are obtained. What is the empirical formula?

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈what is the limiting reactant? C₁₀H₈ + 12 O₂→ 10 CO₂ + 4 H₂O

2 Al + 3 Cl₂ →2 AlCl₃.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

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Exam 4 Review

35 questions

B2H6 + 3 O2 → 2 HBO2 + 2 H2O What mass of O2 will be needed to burn 36.1 g of B2H6?

2Na + 2H2O → 2NaOH + H2How many grams of hydrogen are produced if 120 g of Na are available?

SO2 + PCl5 → SOCl2 + POCl3How many grams of SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?

Cl2 + 2 KBr → Br2 + 2 KClHow many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?

Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.9g of Fe reacts completely with oxygen?4Fe(s)+3O2→2Fe2O3(s)

Quinone, which is used in the dye industry and in photography, is an organic compound containing only C, H, and O. What is the empirical formula of the compound if you find that 0.105 g of the compound gives 0.257 g of CO2 and 0.0350 g of H2O when burned completely?

A 0.2500 g sample of a compound known to contain carbon, hydrogen and oxygen undergoes complete combustion to produce 0.3664 g of CO2 and 0.1500 g of H2O. What is the empirical formula of this compound?

Vanillin, a flavoring agent, is made up of carbon, hydrogen, and oxygen atoms. When a sample of vanillin weighing 2.500g burns in oxygen, 5.79 g of carbon dioxide and 1. 18 g of water are obtained. What is the empirical formula?

When 12 moles of O2 reacts with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O2 → 10 CO2 + 4 H2O

2 Al + 3 Cl2 →2 AlCl3. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

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B₂H₆ + 3 O₂→ 2 HBO₂ + 2 H₂O
What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

2Na + 2H₂O → 2NaOH + H₂
How many grams of hydrogen are produced if 120 g of Na are available?

SO₂+ PCl₅→ SOCl₂+ POCl₃
How many grams of SOCl₂is produced when 16.2g SO₂react with 13.7g PCl_5?

Cl₂ + 2 KBr → Br₂ + 2 KCl
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?

Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe₂O₃ are formed when 16.9g of Fe reacts completely with oxygen?
4Fe_(s)+3O₂→2Fe₂O_3(s)

Quinone, which is used in the dye industry and in photography, is an organic compound containing only C, H, and O. What is the empirical formula of the compound if you find that 0.105 g of the compound gives 0.257 g of CO₂ and 0.0350 g of H₂O when burned completely?

A 0.2500 g sample of a compound known to contain carbon, hydrogen and oxygen undergoes complete combustion to produce 0.3664 g of CO₂ and 0.1500 g of H₂O. What is the empirical formula of this compound?

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈what is the limiting reactant? C₁₀H₈ + 12 O₂→ 10 CO₂ + 4 H₂O

2 Al + 3 Cl₂ →2 AlCl₃.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.