Question 1

Which of the following is the correct balanced chemical equation for the complete combustion of liquid 5-ethyl-2-methylheptane ($\mathrm{C_{10}H_{22}}$)?

Accepted Answer

$\mathrm{2\ C_{10}H_{22}(l) + 31\ O_2(g) \rightarrow 20\ CO_2(g) + 22\ H_2O(g)}$

Question 2

Which reagent is required to convert cyclohexene to cyclohexanol?

Accepted Answer

(i) Cyclohexene; (ii) $\mathrm{H_2,\ Pd-C}$

Question 3

Classify the type of organic reaction for each of the following: I. Alkene + Br$_2$ → dibromoalkane; II. Alkyl bromide + KOtBu/tBuOH, heat → alkene; III. Alkyl bromide + NaI → alkyl iodide + NaBr.

Accepted Answer

I. Addition; II. Elimination; III. Substitution

Question 4

Which of the following reactions does NOT show a homogeneous equilibrium?

Accepted Answer

$\mathrm{2\ KClO_3(s) \rightleftharpoons 2\ KCl(s) + 3\ O_2(g)}$

Question 5

Which of the following compounds is soluble in water?

Accepted Answer

a), c), d)

Question 6

Given the equilibrium $\mathrm{CaCO_3(s) ightleftharpoons CaO(s) + CO_2(g)}$ with $K_c = 2.68 	imes 10^{-3}$ at $800^\circ$C, what is the relative concentration of $\mathrm{CO_2}$ at equilibrium?

Accepted Answer

No, the formation of reactant is favored at equilibrium. $[\mathrm{CO_2}] = 2.68 	imes 10^{-3}$

Question 7

In a lab, benzaldehyde ($\mathrm{C_6H_5CHO}$) is converted to benzoic acid ($\mathrm{C_6H_5COOH}$). Does benzaldehyde undergo oxidation or reduction?

Accepted Answer

Oxidation

Question 8

During the digestion of lactose, the enzyme lactase decomposes lactose into glucose and galactose. Which equation correctly represents this enzymatic conversion, categorizing each carbohydrate as a disaccharide or monosaccharide?

Accepted Answer

Lactose (disaccharide) + Lactase $\rightarrow$ Glucose (monosaccharide) + Galactose (monosaccharide)

Question 9

Consider the following trisaccharide. Determine whether A, B, and C are acetal or hemiacetal linkages.

Accepted Answer

A: acetal linkage; B: acetal linkage; C: hemiacetal linkage

Question 10

Draw the enantiomer of the given sugar (ribose) and describe the original sugar and its enantiomer as D- and L-sugars.

Accepted Answer

Original: D-ribose; Enantiomer: L-ribose

Question 11

What is the main structural difference between starch and glycogen, and what are their respective roles in plants and animals?

Accepted Answer

Starch is made up of both linear amylose and branched amylopectin (branches every 20–30 glucose units), while glycogen is more highly branched (branches every 8–12 glucose units). Starch is an energy storage in plants, while glycogen is a secondary long-term energy storage in animal cells.

Question 12

Which fatty acid has a higher melting point: oleic acid or palmitic acid? Explain your answer.

Accepted Answer

Palmitic acid has a higher melting point than oleic acid because the absence of double bonds allows for tighter packing of the molecules.

Question 13

Which of the following represent $q$ and $w$ for a system that is doing work on the surroundings and losing heat to the surroundings?

Accepted Answer

$q < 0,\ w < 0$

Question 14

Which type of cell transport is responsible for maintaining a higher concentration of potassium ions inside the cell than outside?

Accepted Answer

Active transport

Question 15

Which component is the solvent in a solution made from 100 g sodium bicarbonate, 900 g sodium carbonate, and 10 kg water?

Accepted Answer

10 kg water

Question 16

Which of the following best describes volume/volume percent concentration?

Accepted Answer

It is the unit of concentration expressed as the volume of solute in mL dissolved in 100 mL of solution.

Question 17

A person consumes the following daily diet: 1 large egg (6 g fat, 6 g protein), 1 baked potato (23 g carbohydrate, 3 g protein), 1 medium banana (26 g carbohydrate, 1 g protein), 1 cup nonfat milk (12 g carbohydrate, 9 g protein), 3 oz ground beef (14 g fat, 22 g protein), 3 oz broccoli (4 g carbohydrate, 3 g protein), 3 oz salmon (5 g fat, 16 g protein), 1 cup carrots (11 g carbohydrate, 2 g protein). If the recommended daily intake is 2000 kcal, will this person be able to maintain their weight?

Accepted Answer

The person will not be able to maintain their weight

GOB Chemistry Study Guide: Organic, Biochemical, and General Chemistry Concepts

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