Chapter 5 - Chemical Reactions (Quiz)

When an organic molecule loses hydrogens it is said to be: a. oxidized b. reduced c. both oxidized and reduced d. neither oxidized or reduced

A oxidized

How many calories is 1 gram of carbohydrates? A. 4 B. 9

A. 4

How many calories is 1 gram of Fat? A. 9 B. 4

A. 9

How does an Enzyme increase the rate of a biological process in what way? A. Lowers the activation energy of the process B. Increases the concentration of reactants C. Makes the reaction more exergonic D. Increases the temperature of the reactants

A. Lowers the activation energy of the process

b.) Reduction

Are the substances shown with an asterick undergoing oxidation or reduction? Silver ions (Ag+) are electroplated into silver atoms. a.) oxidation b.) reduction

a.) Oxidation

Are the substances shown with an asterick undergoing oxidation or reduction? The biomolecule FADH2 loses hydrogen becoming FAD. a.) oxidation b.) reduction

Endothermic Reaction A.When two solids are combined in a test tube, the test tube gets hot. B. A reaction must be heated for it to continue

B

When a substance is oxidized it is called a(n): a. oxidizing agent b. reducing agent

B Reducing agent

exothermic reaction A.When two solids are combined in a test tube, the test tube gets hot. B. A reaction must be heated for it to continue

A

b.) Oxidation

Are the substances shown with an asterick undergoing oxidation or reduction? Iron metal forms iron(III) oxide (Fe2O3). a.) reduction b.) oxidation

How many calories is 1 gram of protein? A. 9 B. 4

B. 4

Which of these reactions is a double displacement reaction? A) BaO(s) + H2O(l) → Ba(OH)2(aq) B) CH3COOH(aq) + K2CO3(aq) → H2O(l) + CO2(g) + KCH3COO(aq) C) Mg(s) + HClO4(aq) → Mg(ClO4)2(aq) + H2(g) D) K(s) + H2O(l) → H2(g) + KOH(aq)

CH3COOH(aq) + K2CO3(aq) → H2O(l) + CO2(g) + KCH3COO(aq)

b.) Exchange

Categorize the following reactions as synthesis, decomposition, or exchange reactions in the forward direction. Al2(SO4)3(aq)+6KOH(aq)→2Al(OH)3(s)+3K2SO4(aq) a.) decomposition b.) exchange c.) synthesis

What type of nutrient has the highest energy content per gram? A. Protein B. Fat C. Carbohydrate

C. Fat

What statement is incorrect about this oxidation-reduction reaction? 2 SO2(g) + O2(g) → 2 SO3(g) a. O2 is reduced. b. SO2 is the reducing agent. c. O2 is the oxidizing agent. d. SO2 gains electrons.

D. SO2 gains electrons

2Fe2O3(s)→4FeO(s)+3O2(g)

Decomposition

100 Cal.

Calculate the number of Calories present in a chocolate chip cookie that contains 19g carbohydrate, 3g protein, and 5g fat. Express your answer to one significant figure and include the appropriate units.

c.) Exchange

Categorize the following reactions as synthesis, decomposition, or exchange reactions in the forward direction. CH4(g)+2O2(g)→CO2(g)+2H2O(g) a.) synthesis b.) decomposition c.) exchange

a.) Synthesis

Categorize the following reactions as synthesis, decomposition, or exchange reactions in the forward direction. N2(g)+3H2(g)⇌2NH3(g) a.) synthesis b.) decomposition c.) exchange

b.) endothermic

Classify the following as exothermic or endothermic reactions. On a reaction energy diagram, the reactants are lower energy than the products. a.) exothermic b.) endothermic

b.) Exothermic

Classify the following as exothermic or endothermic reactions. When two solids are combined in a test tube, the test tube gets hot. a.) endothermic b.) exothermic

4HCl(g)+O2(g)→H2O(g)+2Cl2(g)

Exhange

a.) Oxidized b.) Reduced

Identify the reactant that is oxidized and the reactant that is reduced. H2(g)+O2(g)→H2O(g) oxidized, reduced a.) Hydrogen (H) b.) Oxygen (O)

CO2(g)+C(s)⇌2CO(g)

Synthesis

C5H12(g)+8O2(g)→5CO2(g)+6H2O(g)

Write the products and balance the following reaction for the complete combustion of pentane, C5H12. C5H12(g)+O2(g)→?

Ca(s)+Cl2(g)→CaCl2(s)

synthesis: Ca(s)+Cl2(g)→ Express your answer as a chemical equation. Identify all of the phases in your answer.

A piece of zinc placed in hydrochloric acid results in a fierce effervescence and the zinc eventually dissolves, yielding a solution of zinc chloride. A glowing splint gives a "popping" sound, indicating the presence of hydrogen gas. What type of reaction is it? a.decomposition b. combination c. single displacement d. double displacement

Single displacement

A canoe going down stream with the current Spontaneous or Non-spontaneous?

Spontaneous

A chemical reaction that releases free energy Spontaneous or Non-Spontaneous

Spontaneous

True or False. A diamond will convert spontaneously into graphite.

True

True or False: A catalyst increases the reaction rate by reducing the activation energy?

True

a.) The concentration of reactants decreases as the reaction progresses so the rate slows.

Why does the rate of a chemical reaction decrease as the reaction progresses? a.) The concentration of reactants decreases as the reaction progresses so the rate slows. b.) The concentration of products decreases as the reaction progresses so the rate slows. c.) The concentration of reactants increases as the reaction progresses so the rate slows. d.) The concentration of catalyst changes as the reaction progresses so the rate slows.

C5H12(g)+8O2(g)→5CO2(g)+6H2O(l)

Write the products and balance the following reaction for the complete combustion of pentane, C5H12. C5H12(g)+O2(g)→? Express your answer as a chemical equation. Identify all of the phases in your answer.

Enzymes

_____ are biochemical catalysts.

What is the most likely product of hydration of CH3CH=CH2? a. CH3CH2CH3 b. CH3CHOHCH2OH c. CH3CHOHCH3 d. CH3CH2CH2OH

c. CH3CHOHCH3

2HBr(g)→H2(g)+Br2(g)

decomposition: HBr(g)→ Express your answer as a chemical equation. Identify all of the phases in your answer.

BaS(aq)+Pb(NO3)2(aq)→Ba(NO3)2(aq)+PbS(s)

exchange (double): BaS(aq)+Pb(NO3)2(aq)→ Express your answer as a chemical equation. Identify all of the phases in your answer.

Ca(s)+Fe(NO3)2(aq)→Ca(NO3)2(aq)+Fe(s)

exchange (single): Ca(s)+Fe(NO3)2(aq)→ Express your answer as a chemical equation. Identify all of the phases in your answer.