Question

in the below set of problems, pick the best answer from the given answer choices. each question is worth 4 points.

1. a compound in which the constituent atoms have lost or gained electrons to become ions. the ions (+ and -) are held together by charge - balanced electrostatic forces.

a. covalent compound b. ionic compound

1. lowest - common - denominator formula for an ionic compound.

a. formula unit b. molecule

1. a given chemical compound always contains the same elements in the same proportions by mass.

a. law of definite proportions b. lewis dot structure c. octet rule

1. a substance made from a fixed proportion of atoms, of more than one element, held together by chemical bonds.

a. charge balance b. chemical formula c. compound

1. in an ionic compound, the total charge of the positively charged ions is equal to the absolute value of the total charge of the negatively charged ions.

a. charge balance b. chemical formula c. compound

1. a compound in which the constituent atoms share one or more pairs of electrons with each other.

a. covalent compound b. ionic compound

1. in compounds, elements lose, gain, or share electrons such that each atom ends up with eight electrons in the valence shell.

a. law of definite proportions b. lewis dot structure c. octet rule

1. a type of diagram, which shows the bonding between atoms with element symbols and dots, named after gilbert lewis.

a. law of definite proportions b. lewis dot structure c. octet rule

1. a neutral group of atoms held together by covalent bonds.

a. formula unit b. molecule

1. this representation tells us the number of atoms of each element in a compound using element symbols and subscripts.

a. charge balance b. chemical formula c. compound

Explanation:

1. Ionic compounds are formed by ions held together by electrostatic forces.
2. Formula unit is the lowest - common - denominator formula for an ionic compound.
3. The Law of Definite Proportions states a compound has elements in fixed mass proportions.
4. A compound is made from atoms of more than one element held by chemical bonds.
5. Charge balance in ionic compounds means total positive charge equals absolute value of total negative charge.
6. Covalent compounds have atoms sharing electron pairs.
7. The octet rule says atoms gain, lose, or share electrons to have eight valence electrons.
8. Lewis dot structure is a diagram showing bonding with element symbols and dots.
9. A molecule is a neutral group of atoms held by covalent bonds.
10. A chemical formula shows the number of atoms of each element in a compound using element symbols and subscripts.

Answer:

1. B. Ionic compound
2. A. formula unit
3. A. Law of Definite Proportions
4. C. compound
5. A. charge balance
6. A. covalent compound
7. C. octet rule
8. B. Lewis dot structure
9. B. molecule
10. B. chemical formula