Iron metal reacts with hydrochloric acid as follows: 2Fe(s) + 6HCl(aq) $\rightarrow$ 2FeCl3(aq) + 3H2(g) If 35.6 g of iron react with excess HCl, and 98.6 g of FeCl3 are collected, what is the percent yield of FeCl3?

A) 103% B) 104% C) 95.7% D) 63.0% E) not enough information given A) 103% B) 104% C) 95.7% D) 63.0% E) not enough information given

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s) + 3H2SO4(aq) $\rightarrow$Al2(SO4)3(s) + 3H2(g) If 10.0 g of aluminum reacts with excess sulfuric acid, and 54.2 g of Al2(SO4)3 are collected, what is the percent yield of Al2(SO4)3?

A) 63.4% B) 85.5% C) 117% D) 47.1% E) not enough information given A) 63.4% B) 85.5% C) 117% D) 47.1% E) not enough information given

Nitrogen and hydrogen react together to form ammonia according to the equation: ___N2(g) + ___H2(g) $\rightarrow$___NH3(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 50.4 g of nitrogen.

A) 10.9 g B) 3.64 g C) 7.28 g D) 2.68 g E) 1.78 g A) 10.9 g B) 3.64 g C) 7.28 g D) 2.68 g E) 1.78 g

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s) + 3Cl2(g) $\rightarrow$2FeCl3(s) If 35.0 g each of iron and chlorine are combined, how much FeCl3 should form?

A) 102 g B) 155 g C) 53.4 g D) 80.0 g E) 68.0 g A) 102 g B) 155 g C) 53.4 g D) 80.0 g E) 68.0 g

Nitrogen and hydrogen react together to form ammonia according to the equation: ___N2(g) + ___H2(g)$\rightarrow$___NH3(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

A) 1.82 g B) 3.64 g C) 5.45 g D) 1.34 g E) 0.891 A) 1.82 g B) 3.64 g C) 5.45 g D) 1.34 g E) 0.891

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl2(g) $\rightarrow$ 2NaCl(s) If the mass of the sodium solid increases by 0.500 g, what mass of sodium metal should have reacted?

A) 0.250 g B) 0.500 g C) 0.0811 g D) 0.162 g E) 0.324 g A) 0.250 g B) 0.500 g C) 0.0811 g D) 0.162 g E) 0.324 g

Consider the reaction between hydrogen and oxygen gases to form water: 2H2(g) + O2(g) $\rightarrow$ 2H2O(l) If 8.5 moles of oxygen react with sufficient hydrogen, how many grams of water should form?

A) 0.94 g B) 0.47 g C) 76 g D) 3.1 x 102 g E) 1.5 x 102 g A) 0.94 g B) 0.47 g C) 76 g D) 3.1 x 102 g E) 1.5 x 102 g

When acetylene, C2H2, a fuel used in welding, is burned in air, two molecules of acetylene combine with five oxygen molecules to form four CO2 molecules and two H2O molecules.Select the statement below that is incorrect in regard to this reaction.

A) The balanced equation for the reaction is 2C2H2 + 5O2 $\rightarrow$4CO2 + 2H2O. B) If 8 acetylene molecules react, 12 CO2 molecules should form. C) If 12 H2O molecules are formed, then 30 O2 molecules must have reacted. D) If 12 CO2 molecules are formed, then 6 H2O molecules should also form. E) If 24 ethanol molecules react, then 60 oxygen molecules must also react A) The balanced equation for the reaction is 2C2H2 + 5O2 $\rightarrow$4CO2 + 2H2O. B) If 8 acetylene molecules react, 12 CO2 molecules should form. C) If 12 H2O molecules are formed, then 30 O2 molecules must have reacted. D) If 12 CO2 molecules are formed, then 6 H2O molecules should also form. E) If 24 ethanol molecules react, then 60 oxygen molecules must also react

Exam 6: Quantities in Chemical Reactions

Iron metal reacts with hydrochloric acid as follows: 2Fe(s) + 6HCl(aq) $\rightarrow$ 2FeCl₃(aq) + 3H₂(g) If 35.6 g of iron react with excess HCl, and 98.6 g of FeCl₃ are collected, what is the percent yield of FeCl₃?

(Multiple Choice)

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Question 21

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s) + 3H₂SO₄(aq) $\rightarrow$ Al₂(SO₄)₃(s) + 3H₂(g) If 10.0 g of aluminum reacts with excess sulfuric acid, and 54.2 g of Al₂(SO₄)₃ are collected, what is the percent yield of Al₂(SO₄)₃?

(Multiple Choice)

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Question 22

The coefficients of a balanced equation can be understood to represent either relative numbers of moles or relative mass.

(True/False)

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Question 23

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s) + 3O₂(g) $\rightarrow$ 2PbO(s) + 2SO₂(g) If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

(Multiple Choice)

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Question 24

The specific heat of a substance is the amount of heat energy that is needed to cause the substance to melt.

(True/False)

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Question 25

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g) $\rightarrow$ ___NH₃(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 50.4 g of nitrogen.

(Multiple Choice)

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Question 26

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g) $\rightarrow$ ___NH₃(g)(unbalanced) Balance the equation, and determine how many grams of hydrogen reactant would be required to produce 25.0 g of ammonia, assuming there is sufficient nitrogen available.

(Multiple Choice)

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Question 27

If you wish to make sandwiches which consist of two slices of bread, one ham slice, and three pickle slices, how many sandwiches could you make if you have 12 slices of bread, five slices of ham, and 20 pickle slices, and what would be left over?

(Multiple Choice)

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Question 28

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s) + 3Cl₂(g) $\rightarrow$ 2FeCl₃(s) If 35.0 g each of iron and chlorine are combined, how much FeCl₃ should form?

(Multiple Choice)

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Question 29

What mass (in grams) of SF₆ should be produced by the following reaction if 7.00 g of sulfur is mixed with 9.00 g of fluorine? S + 3F₂ $\rightarrow$ SF₆

(Multiple Choice)

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Question 30

Consider the following specific heats of metals. If the same amount of heat is added to 25.0 g of each of these metals, all at the same initial temperature, which metal will have the highest final temperature?

(Multiple Choice)

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Question 31

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g) $\rightarrow$ ___NH₃(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

(Multiple Choice)

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Question 32

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl₂(g) $\rightarrow$ 2NaCl(s) If the mass of the sodium solid increases by 0.500 g, what mass of sodium metal should have reacted?

(Multiple Choice)

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Question 33

When sodium sulfate, Na₂SO₄, dissolves in water, the ions that are formed for each formula unit that dissolves are:

(Multiple Choice)

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Question 34

Consider the reaction between hydrogen and oxygen gases to form water: 2H₂(g) + O₂(g) $\rightarrow$ 2H₂O(l) If 8.5 moles of oxygen react with sufficient hydrogen, how many grams of water should form?

(Multiple Choice)

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Question 35

When phosphorus reacts with chlorine, phosphorus trichloride is formed according to the following equation: _P₄(s) + _Cl₂(g) $\rightarrow$ ___PCl₃(l) (unbalanced) Balance the equation and determine how many grams of phosphorus reactant would be required to produce 75.0 g of phosphorus trichloride, assuming there is sufficient chlorine available.

(Multiple Choice)

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Question 36

When acetylene, C₂H₂, a fuel used in welding, is burned in air, two molecules of acetylene combine with five oxygen molecules to form four CO₂ molecules and two H₂O molecules.Select the statement below that is incorrect in regard to this reaction.

(Multiple Choice)

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Question 37

Consider the following reaction: Cr₂O₃(s) + 3CCl₄(l) $\rightarrow$ 2CrCl₃(s) + 3COCl₂(g) green colorless purple colorless solid liquid solid gas When the green solid is mixed with the colorless liquid, the mixture starts to bubble and fume.When all action has stopped, a dry purple solid containing solid green specks remains.Which substance is the limiting reactant?

(Multiple Choice)

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Question 38

All of the following may change during a chemical reaction except

(Multiple Choice)

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Question 39

The number of moles of reactant molecules must always equal the number of moles of product molecules in a balanced equation.

(True/False)

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Question 40

Showing 21 - 40 of 120

Iron metal reacts with hydrochloric acid as follows: 2Fe(s) + 6HCl(aq) $\rightarrow$ 2FeCl₃(aq) + 3H₂(g) If 35.6 g of iron react with excess HCl, and 98.6 g of FeCl₃ are collected, what is the percent yield of FeCl₃?

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s) + 3H₂SO₄(aq) $\rightarrow$ Al₂(SO₄)₃(s) + 3H₂(g) If 10.0 g of aluminum reacts with excess sulfuric acid, and 54.2 g of Al₂(SO₄)₃ are collected, what is the percent yield of Al₂(SO₄)₃?

The coefficients of a balanced equation can be understood to represent either relative numbers of moles or relative mass.

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s) + 3O₂(g) $\rightarrow$ 2PbO(s) + 2SO₂(g) If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

The specific heat of a substance is the amount of heat energy that is needed to cause the substance to melt.

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g) $\rightarrow$ ___NH₃(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 50.4 g of nitrogen.

If you wish to make sandwiches which consist of two slices of bread, one ham slice, and three pickle slices, how many sandwiches could you make if you have 12 slices of bread, five slices of ham, and 20 pickle slices, and what would be left over?

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s) + 3Cl₂(g) $\rightarrow$ 2FeCl₃(s) If 35.0 g each of iron and chlorine are combined, how much FeCl₃ should form?

What mass (in grams) of SF₆ should be produced by the following reaction if 7.00 g of sulfur is mixed with 9.00 g of fluorine? S + 3F₂ $\rightarrow$ SF₆

Consider the following specific heats of metals. If the same amount of heat is added to 25.0 g of each of these metals, all at the same initial temperature, which metal will have the highest final temperature?

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g) $\rightarrow$ ___NH₃(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl₂(g) $\rightarrow$ 2NaCl(s) If the mass of the sodium solid increases by 0.500 g, what mass of sodium metal should have reacted?

When sodium sulfate, Na₂SO₄, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Consider the reaction between hydrogen and oxygen gases to form water: 2H₂(g) + O₂(g) $\rightarrow$ 2H₂O(l) If 8.5 moles of oxygen react with sufficient hydrogen, how many grams of water should form?

When acetylene, C₂H₂, a fuel used in welding, is burned in air, two molecules of acetylene combine with five oxygen molecules to form four CO₂ molecules and two H₂O molecules.Select the statement below that is incorrect in regard to this reaction.

All of the following may change during a chemical reaction except

The number of moles of reactant molecules must always equal the number of moles of product molecules in a balanced equation.

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

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Exam 6: Quantities in Chemical Reactions

Iron metal reacts with hydrochloric acid as follows: 2Fe(s) + 6HCl(aq) →\rightarrow→ 2FeCl3(aq) + 3H2(g) If 35.6 g of iron react with excess HCl, and 98.6 g of FeCl3 are collected, what is the percent yield of FeCl3?

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s) + 3H2SO4(aq) →\rightarrow→ Al2(SO4)3(s) + 3H2(g) If 10.0 g of aluminum reacts with excess sulfuric acid, and 54.2 g of Al2(SO4)3 are collected, what is the percent yield of Al2(SO4)3?

The coefficients of a balanced equation can be understood to represent either relative numbers of moles or relative mass.

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s) + 3O2(g) →\rightarrow→ 2PbO(s) + 2SO2(g) If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

The specific heat of a substance is the amount of heat energy that is needed to cause the substance to melt.

Nitrogen and hydrogen react together to form ammonia according to the equation: ___N2(g) + ___H2(g) →\rightarrow→ ___NH3(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 50.4 g of nitrogen.

If you wish to make sandwiches which consist of two slices of bread, one ham slice, and three pickle slices, how many sandwiches could you make if you have 12 slices of bread, five slices of ham, and 20 pickle slices, and what would be left over?

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s) + 3Cl2(g) →\rightarrow→ 2FeCl3(s) If 35.0 g each of iron and chlorine are combined, how much FeCl3 should form?

What mass (in grams) of SF6 should be produced by the following reaction if 7.00 g of sulfur is mixed with 9.00 g of fluorine? S + 3F2 →\rightarrow→ SF6

Consider the following specific heats of metals. If the same amount of heat is added to 25.0 g of each of these metals, all at the same initial temperature, which metal will have the highest final temperature?

Nitrogen and hydrogen react together to form ammonia according to the equation: ___N2(g) + ___H2(g) →\rightarrow→ ___NH3(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl2(g) →\rightarrow→ 2NaCl(s) If the mass of the sodium solid increases by 0.500 g, what mass of sodium metal should have reacted?

When sodium sulfate, Na2SO4, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Consider the reaction between hydrogen and oxygen gases to form water: 2H2(g) + O2(g) →\rightarrow→ 2H2O(l) If 8.5 moles of oxygen react with sufficient hydrogen, how many grams of water should form?

When acetylene, C2H2, a fuel used in welding, is burned in air, two molecules of acetylene combine with five oxygen molecules to form four CO2 molecules and two H2O molecules.Select the statement below that is incorrect in regard to this reaction.

All of the following may change during a chemical reaction except

The number of moles of reactant molecules must always equal the number of moles of product molecules in a balanced equation.

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Iron metal reacts with hydrochloric acid as follows: 2Fe(s) + 6HCl(aq) $\rightarrow$ 2FeCl₃(aq) + 3H₂(g) If 35.6 g of iron react with excess HCl, and 98.6 g of FeCl₃ are collected, what is the percent yield of FeCl₃?

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s) + 3H₂SO₄(aq) $\rightarrow$ Al₂(SO₄)₃(s) + 3H₂(g) If 10.0 g of aluminum reacts with excess sulfuric acid, and 54.2 g of Al₂(SO₄)₃ are collected, what is the percent yield of Al₂(SO₄)₃?

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s) + 3O₂(g) $\rightarrow$ 2PbO(s) + 2SO₂(g) If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g) $\rightarrow$ ___NH₃(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 50.4 g of nitrogen.

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s) + 3Cl₂(g) $\rightarrow$ 2FeCl₃(s) If 35.0 g each of iron and chlorine are combined, how much FeCl₃ should form?

What mass (in grams) of SF₆ should be produced by the following reaction if 7.00 g of sulfur is mixed with 9.00 g of fluorine? S + 3F₂ $\rightarrow$ SF₆

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g) $\rightarrow$ ___NH₃(g) (unbalanced) Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl₂(g) $\rightarrow$ 2NaCl(s) If the mass of the sodium solid increases by 0.500 g, what mass of sodium metal should have reacted?

When sodium sulfate, Na₂SO₄, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Consider the reaction between hydrogen and oxygen gases to form water: 2H₂(g) + O₂(g) $\rightarrow$ 2H₂O(l) If 8.5 moles of oxygen react with sufficient hydrogen, how many grams of water should form?

When acetylene, C₂H₂, a fuel used in welding, is burned in air, two molecules of acetylene combine with five oxygen molecules to form four CO₂ molecules and two H₂O molecules.Select the statement below that is incorrect in regard to this reaction.