Chapter 2 Homework

Referring to the following reaction, identify the product of the reaction. 3H2 (g) + N2 (g) → 2NH3 (g)

2NH3 (g)

Which of the following best describes the tertiary structure of proteins?

3D globular structures stabilized by covalent disulfide bridges

Choose the true statement(s) regarding the pH scale. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

A solution with a pH of 6 has an H+ concentration that is tenfold higher than that of a solution with a pH of 7. Acidosis is a pathological situation in which the body has a lower than normal blood pH. A solution's pH decreases as H+ concentration increases.

Describe the relationship between acids, bases, salts, and water, and explain how the pH scale is used to measure acidity and basicity.

Acids add hydrogen ions (H+) when dissolved in water and bases add hydroxide ions (OH−) when dissolved in water. Salts form when acids and bases react with each other; the acid contributes the anion of a salt, while the base contributes a cation. H+ and OH−ions determine the overall acidity or basicity of a solution or pH. pH scale describes the acidity and basicity of a solution. pH values typically fall between 0-14. When an acid is added to a basic solution the pH will decrease. When a base is added to an acidic solution the pH will increase.

Choose the true statement(s) about activation energy. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Activation energy is the minimum amount of energy needed to start a reaction. Enzymes lower the activation energy of a reaction.

Choose the true statement(s) about atoms. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

An atom is the smallest unit of an element. The nucleus of an atom contains neutrons.

Choose the true statement(s) about ions. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Anions result when atoms gain an electron. Cations have more protons than electrons.

Which of the following is (are) organic? To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

C6H12O6 CH4

Choose the true statement(s) regarding molecular formulas. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Carbon is listed first by its chemical symbol "C" in a molecular formula. The positive ion is listed first followed by the negative ion when writing a molecular formula.

Using the Periodic Table of Elements, select all of the true statements about carbon. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Carbon's atomic number is 6. One carbon atom contains 6 protons and 6 neutrons.

____________ are organic or inorganic substances that increase the rate of a reaction but are not used up in the reaction.

Catalysts

__________ are small proteins that help fold larger proteins.

Chaperones

______are molecules made up of more than one type of element.

Compounds

How are DNA and RNA different? To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

DNA is usually double-stranded, while RNA is usually single-stranded. Deoxyribonucleotides make up DNA, while ribonuclotides make up RNA.

Choose the mismatched pairing(s). To be marked correct, you'll need to select all mismatched statements, as there may be more than one correct answer.

Dehydration synthesis: A + BC → AC + B

Assume you are a pediatric patient suffering from a severe form of infectious diarrhea. Which of the following condition(s) is/are they most likely to develop as a direct result of diarrhea? To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Electrolyte imbalance Dehydration

___________ are formed when ionic compounds dissolve in solution and have a role in regulating blood volume.

Electrolytes

Choose the true statement(s) about equilibrium. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Equilibrium is not a static situation where the reaction just stops. By definition, equilibrium is a term that mainly applies to reversible reactions. Reactions at equilibrium have the forward and reverse reactions occurring at the same rate.

Choose the false statement(s) about carbohydrates. To be marked correct, you'll need to select all false statements, as there may be more than one correct answer.

Glucose is stored in the liver as starch. Sucrose is an example of a monosaccharide.

____________ do not bind atoms into molecules. Instead, they are non-covalent electrostatic attractions between two or more molecules or within a single large molecule.

Hydrogen bonds

Choose the mismatched pairing(s). To be marked correct, you'll need to select all mismatched statements, as there may be more than one correct answer.

Hydrophobic molecules: PolarHydrophilic: Oil

_____________ are atoms with the same number of protons but a different number of neutrons.

Isotopes

Choose the true statement(s) about micelles. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Micelles are made by amphipathic molecules. Detergents can form micelles. Micelles contain both water-loving and water-fearing regions.

Which type of bond links amino acids together to form a protein's primary structure?

Peptide bonds

Choose the mismatched pairing(s) about biomolecules. To be marked correct, you'll need to select all mismatched statements, as there may be more than one correct answer.

Protein: Capsule

Select all of the true statements regarding biomolecules and their building block monomers. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

Proteins are built from amino acids. Carbohydrates are built from monosaccharides.

Choose the false statement(s) about acids and bases. To be marked correct, you'll need to select all false statements, as there may be more than one correct answer.

Pure water has more H+ ions than OH- ions. If an acid is added to an acidic solution, the pH will increase.

Choose the false statement(s) about isotopes. To be marked correct, you'll need to select all false statements, as there may be more than one correct answer.

Radiopharmaceuticals contain specific isomer formulations. Isotopes are made by redox reactions.

Which of the following lipids tends to be liquid at room temperature?

Unsaturated lipids

Which reaction has X and Y as reactants?

X + Y → XY

Organisms depend on _______, which are compounds that stabilize pH by absorbing or releasing H+ ions.

buffers

In biological systems, the energy released by ______ reactions is used to fuel _________ reactions.

exergonic, endergonic

Compared to a solution with a pH value of 4, a solution with a pH value of 2 has ________ H+ ions.

one hundred times as many

Which level of protein structure can involve hydrogen bonds?

secondary and tertiary