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.