Unit 1 Review

Electronegativity is: (a)  

• The energy released when an electro
• A measure of the ability of an atom
• The amount of energy needed to remo
• The degree to which an atom can rep

Answer explanation

A measure of the ability of an atom in a chemical compound to attract electrons

Ionic bonds form between (a)   .

• Two metals
• Two nonmetals
• A metal and a nonmetal
• Two isotopes

Answer explanation

Ionic bonds form between a metal and a nonmetal, where one atom donates electrons to the other, resulting in a strong electrostatic attraction.

Organic molecules typically contain: _____

Answer explanation

Organic molecules typically contain carbon and hydrogen, making the choice 'Carbon and hydrogen' the correct answer.

Which element is most commonly found in organic molecules?

• Oxygen

• Hydrogen

• Carbon

• Nitrogen

Answer explanation

Carbon is the most commonly found element in organic molecules, forming the backbone of many organic compounds.

In the chemical reaction CO2 + 2H2O -> C6H12O6 + O2, the reactants are: (a)  

• C6H12O6 and O2
• CO2 and H2O
• CO2 and O2
• H2O and O2

Answer explanation

In the chemical reaction CO2 + 2H2O -> C6H12O6 + O2, the reactants are CO2 and H2O.

Water is a polar molecule because:

• It has hydrogen atoms are slightly positive, and the oxygen atom is slightly negative.

• It has an equal distribution of electrical charge.

• It can dissolve ionic compounds easily.

• Its molecules contain nonpolar covalent bonds.

Answer explanation

Water is a polar molecule because it has hydrogen atoms that are slightly positive, and the oxygen atom is slightly negative, creating an unequal distribution of electrical charge.

Hydrogen bonds in water contribute to which property?

• High specific heat

• Low boiling point

• High thermal conductivity

• Low heat of vaporization

Answer explanation

Hydrogen bonds in water contribute to the high specific heat property.

Which is NOT a macromolecule?

• Protein

• Lipid

• Glucose

• Nucleic Acid

Answer explanation

Glucose is NOT a macromolecule because it is a monosaccharide, not a large complex molecule like proteins, lipids, or nucleic acids.

Macromolecules are formed by which process?

• Hydrolysis

• Dehydration synthesis

• Oxidation-reduction

• Sublimation

Answer explanation

Macromolecules are formed by dehydration synthesis, where water molecules are removed to link monomers together to form a larger molecule.

Which process breaks down macromolecules into their monomers?

• Condensation

• Dehydration synthesis

• Hydrolysis

• Sublimation

Answer explanation

Hydrolysis is the process that breaks down macromolecules into their monomers by adding water molecules to break the bonds between monomers.