HSPS Mid-Term Review

What does the number at the top of the square tell you about carbon?

• A carbon has 6 isotopes.

• Carbon has an average atomic mass of 6.

• A carbon nucleus has 6 protons.

• A carbon atom has 6 electrons in its outermost energy level.

Which of the following statements about cobalt (Co) and nickel (Ni) is true?

• Cobalt has a greater average atomic mass than nickel does.

• Nickel atoms have more protons than cobalt atoms do.

• Cobalt atoms have more electrons than nickel atoms do.

• Cobalt and nickel belong to the same group on the periodic table.

Atom A contains 8 protons and 8 neutrons. Atom B contains 8 protons and 9 neutrons. Which of the following statements correctly describes the two atoms?

• They are isotopes of the same element.

• They are radioactive.

• They are atoms of different elements.

• They have the same mass number.

An atom of chlorine forms an ionic bond when combined with an atom of potassium. However, an atom of chlorine forms a covalent bond when combined with an atom of carbon. What statement correctly describes an electron of chlorine in these two different bonds?

• Electrons spend more time closer to the chlorine in the ionic bond.

• Electrons spend more time closer to the carbon in the covalent bond.

• Electrons spend equal time around the chlorine and potassium in the ionic bond.

• Electrons spend equal time around the chlorine and carbon in the covalent bond.

Sodium chloride, or table salt, forms when a chlorine atom takes an electron from a neighboring sodium atom. Which of the following describes the force that holds sodium chloride together?

• a hydrogen bond

• a ionic bond

• a metallic bond

• a covalent bond

What property of copper allows copper wire to bend without breaking?

• Copper atoms have 29 protons.

• Copper atoms form metallic bonds with each other.

• Copper atoms do not have a full outermost energy level.

• Copper is found in Group 11 on the periodic table

Nitrogen dioxide is a covalent compound. How many oxygen atoms are in a nitrogen dioxide molecule?

Mathematical Equivalence

ON

Oxygen (O) atoms have six valence electrons and beryllium (Be) atoms have two valence electrons. Which of the following is the correct formula for a compound made of oxygen and beryllium?

• BeO

• BeO₂

• BeO₆

• Be₂O₆

The correct name for the binary compound, Na₂O, is

• Sodium oxide

• Sodium oxygen

• Disodium oxide

• Disodium monoxide

The correct name for the binary compound, CCl₄, is

• Carbon chloride

• Carbon tetrachloride

• Monocarbon chloride

• Monocarbon tetrachloride