Question 1

Table 2.2 NaOH ⇌ Na+ + OH-  base HF ⇌ H+ + F- - acid MgSO4 ⇌ Mg2+ + SO42-  salt KH₂PO4 ⇌ K+ + H₂PO4-  acid H₂SO4 ⇌ 2H+ + SO42-  salt Which of the following statements about the reactions in Table 2.2 is FALSE?

Accepted Answer

The reactions in Table 2.2 are not exchange reactions; they are dissociation reactions where compounds break into ions. Exchange reactions involve the exchange of components between reactants.

Question 2

Which type of molecule contains the alcohol glycerol?

Accepted Answer

Glycerol is a component of phospholipids, which are a major class of lipids forming the structural basis of cell membranes.

Question 3

Identify the following reaction: Lactose + H₂O → Glucose + Galactose

Accepted Answer

Hydrolysis is a chemical reaction in which a molecule of water is added to a larger molecule, causing the larger molecule to split into two smaller molecules. In this case, lactose is split into glucose and galactose.

Question 4

Which of the following statements is FALSE?

Accepted Answer

Water molecules are not formed by hydrolysis; instead, hydrolysis is a reaction where water is used to break down compounds.

Question 5

Identify the following reaction: NH4OH ⇌ NH3 + H₂O

Accepted Answer

This reaction is a reversible reaction because it can proceed in both the forward and reverse directions, where NH4OH dissociates into NH3 and H2O and can also recombine to form NH4OH.

Question 6

Antacids neutralize acid by the following reaction. Identify the salt in the following equation: Mg(OH)2 + 2HCl → MgCl2 + H₂O

Accepted Answer

The salt formed in the reaction between magnesium hydroxide (Mg(OH)2) and hydrochloric acid (HCl) is magnesium chloride (MgCl2).

Question 7

Which of the following is the type of bond between molecules of water in a beaker of water?

Accepted Answer

The bond between molecules of water in a beaker of water is a hydrogen bond. This is because water molecules contain polar covalent bonds where the electrons are not shared equally between the hydrogen and oxygen atoms. As a result, the hydrogen atoms in one molecule are attracted to the oxygen atoms in nearby molecules, forming a weak electrostatic attraction known as a hydrogen bond.

Question 8

Which type of molecule NEVER contains a phosphate group?

Accepted Answer

Triglycerides are composed of glycerol and three fatty acids and do not contain a phosphate group.

Question 9

Identify the following reaction: Glucose + Fructose → Sucrose + Water

Accepted Answer

This is a dehydration synthesis reaction in which two monosaccharides (glucose and fructose) combine to form a disaccharide (sucrose) with the loss of a water molecule.

Question 10

Table 2.1 16 O 12 C 1 H
8 6 1
Using the information in Table 2.1, calculate the number of moles in 92 grams of ethanol, C2H5OH.

Accepted Answer

The molar mass of ethanol (C2H5OH) is calculated as follows: (2 * 12) + (6 * 1) + (1 * 16) = 24 + 6 + 16 = 46 g/mol. Therefore, the number of moles in 92 grams of ethanol is 92 / 46 = 2 moles.

Question 11

Based upon the valence numbers of the elements magnesium (2) and hydrogen (1), predict how many covalent bonds would form between these atoms to achieve the full complement of electrons in their outermost energy shells.

Accepted Answer

Magnesium needs to lose two electrons to achieve a full outer shell, while hydrogen needs to gain one electron. Therefore, they would bond together by sharing two electrons in a covalent bond. This means that two covalent bonds would form between one magnesium atom and two hydrogen atoms.

Question 12

Which of the following statements about the atom 12 C is FALSE? 6

Accepted Answer

The atom 12 C (Carbon-12) has 6 protons and 6 neutrons in its nucleus, not 12 neutrons.

Question 13

Which type of molecule is composed of (CH₂O) units?

Accepted Answer

Carbohydrates are composed of repeating units of (CH₂O), which is the basic formula for monosaccharides like glucose.

Question 14

What is the type of bond holding hydrogen and oxygen atoms together in a single H 2O molecule?

Accepted Answer

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. In a water molecule, the hydrogen and oxygen atoms are held together by covalent bonds.

Question 15

Table 2.1 16 O 12 C 1 H
8 6 1
Using the information in Table 2.1, calculate the molecular weight of ethanol, C 2H5OH.

Accepted Answer

The molecular weight of ethanol (C2H5OH) is calculated by adding the atomic weights of its constituent atoms: (2 * 12 for Carbon) + (6 * 1 for Hydrogen) + (1 * 16 for Oxygen) = 24 + 6 + 16 = 46.

Question 16

Which type of molecule contains -NH₂ (amino) groups?

Accepted Answer

Proteins contain amino groups as they are made up of amino acids, which have an -NH2 group.

Question 17

Which of the following statements regarding protein structure is FALSE?

Accepted Answer

Tertiary structures are formed by various types of interactions, including hydrogen bonds, ionic bonds, van der Waals forces, and hydrophobic interactions, not just covalent bonds.

Question 18

Which of the following pairs is mismatched?

Accepted Answer

KH2PO4 is a salt, not an acid. It can act as a weak acid in solution, but it is primarily considered a salt.

Question 19

Which of the following is the type of bond holding K+ and I- ions in KI?

Accepted Answer

KI is composed of a positively charged potassium ion (K+) and a negatively charged iodide ion (I-) and they are held together by electrostatic attraction between opposite charges, which is characteristic of an ionic bond.

Question 20

Identify the following reaction: HCl + NaHCO3 → NaCl + H₂CO3

Accepted Answer

This is an exchange reaction where the ions of the reactants are exchanged to form new products, NaCl and H2CO3.

Quiz 2: Chemical Principles

Table 2.2 NaOH ⇌ Na+ + OH-  base HF ⇌ H+ + F- - acid MgSO4 ⇌ Mg2+ + SO42-  salt KH₂PO4 ⇌ K+ + H₂PO4-  acid H₂SO4 ⇌ 2H+ + SO42-  salt Which of the following statements about the reactions in Table 2.2 is FALSE?

Which type of molecule contains the alcohol glycerol?

Identify the following reaction: Lactose + H₂O → Glucose + Galactose

Which of the following statements is FALSE?

Identify the following reaction: NH4OH ⇌ NH3 + H₂O

Antacids neutralize acid by the following reaction. Identify the salt in the following equation: Mg(OH) 2 + 2HCl → MgCl2 + H₂O

Which of the following is the type of bond between molecules of water in a beaker of water?

Which type of molecule NEVER contains a phosphate group?

Identify the following reaction: Glucose + Fructose → Sucrose + Water

Table 2.1 16 O 12 C 1 H 8 6 1 Using the information in Table 2.1, calculate the number of moles in 92 grams of ethanol, C2H5OH.

Based upon the valence numbers of the elements magnesium (2) and hydrogen (1) , predict how many covalent bonds would form between these atoms to achieve the full complement of electrons in their outermost energy shells.

Which of the following statements about the atom 12 C is FALSE? 6

Which type of molecule is composed of (CH₂O) units?

What is the type of bond holding hydrogen and oxygen atoms together in a single H 2O molecule?

Table 2.1 16 O 12 C 1 H 8 6 1 Using the information in Table 2.1, calculate the molecular weight of ethanol, C 2H5OH.

Which type of molecule contains -NH₂ (amino) groups?

Which of the following statements regarding protein structure is FALSE?

Which of the following pairs is mismatched?

Which of the following is the type of bond holding K+ and I- ions in KI?

Identify the following reaction: HCl + NaHCO3 → NaCl + H₂CO3

Quiz 2: Chemical Principles

Table 2.2 NaOH ⇌ Na+ + OH-  base HF ⇌ H+ + F- - acid MgSO4 ⇌ Mg2+ + SO42-  salt KH2PO4 ⇌ K+ + H2PO4-  acid H2SO4 ⇌ 2H+ + SO42-  salt Which of the following statements about the reactions in Table 2.2 is FALSE?

Which type of molecule contains the alcohol glycerol?

Identify the following reaction: Lactose + H2O → Glucose + Galactose

Which of the following statements is FALSE?

Identify the following reaction: NH4OH ⇌ NH3 + H2O

Antacids neutralize acid by the following reaction. Identify the salt in the following equation: Mg(OH) 2 + 2HCl → MgCl2 + H2O

Which of the following is the type of bond between molecules of water in a beaker of water?

Which type of molecule NEVER contains a phosphate group?

Identify the following reaction: Glucose + Fructose → Sucrose + Water

Table 2.1 16 O 12 C 1 H 8 6 1 Using the information in Table 2.1, calculate the number of moles in 92 grams of ethanol, C2H5OH.

Based upon the valence numbers of the elements magnesium (2) and hydrogen (1) , predict how many covalent bonds would form between these atoms to achieve the full complement of electrons in their outermost energy shells.

Which of the following statements about the atom 12 C is FALSE? 6

Which type of molecule is composed of (CH2O) units?

What is the type of bond holding hydrogen and oxygen atoms together in a single H 2O molecule?

Table 2.1 16 O 12 C 1 H 8 6 1 Using the information in Table 2.1, calculate the molecular weight of ethanol, C 2H5OH.

Which type of molecule contains -NH2 (amino) groups?

Which of the following statements regarding protein structure is FALSE?

Which of the following pairs is mismatched?

Which of the following is the type of bond holding K+ and I- ions in KI?

Identify the following reaction: HCl + NaHCO3 → NaCl + H2CO3

Table 2.2 NaOH ⇌ Na+ + OH-  base HF ⇌ H+ + F- - acid MgSO4 ⇌ Mg2+ + SO42-  salt KH₂PO4 ⇌ K+ + H₂PO4-  acid H₂SO4 ⇌ 2H+ + SO42-  salt Which of the following statements about the reactions in Table 2.2 is FALSE?

Identify the following reaction: Lactose + H₂O → Glucose + Galactose

Identify the following reaction: NH4OH ⇌ NH3 + H₂O

Antacids neutralize acid by the following reaction. Identify the salt in the following equation: Mg(OH) 2 + 2HCl → MgCl2 + H₂O

Which type of molecule is composed of (CH₂O) units?

Which type of molecule contains -NH₂ (amino) groups?

Identify the following reaction: HCl + NaHCO3 → NaCl + H₂CO3