PS 6.3 Formative

When a metal forms more than one ion, the name of the ion contains a Roman numeral to indicate the (a)   on the ion.

A _____ is a covalently bonded group of atoms that has a positive or negative charge and acts as a unit.

• charged particle

• molecule

• polyatomic ion

How many ammonium ions are needed to form a compound with one phosphate ion?

(a)  

Which of the following information is provided by the name and formula of a molecular compound? (may be more than one answer)

• number of atoms in the compound

• number of bonds in the compound

• elements in the compound

Tags

NGSS.MS-PS1-1

Which appears first in the name of a molecular compound?

• the least metallic element

• the most metallic ele

• the polyatomic ion

Which of the following identifies the method of naming the number of atoms in molecular compounds?

• prefix

• suffix

• number

• symbol

The formula for sodium sulfide is Na₂S. The sodium ion has a charge of 1+. What must the charge of the sulfide ion be?

• 1+

• 2+

• 1-

• 2-

A compound made from only two elements is a (a)   compound.

Because all compounds are neutral, the total charges on the cations and anions in the formula of an ionic compound must add up to zero.

• true

• false

Which of the following information provided by the formula for an ionic compound. (May be more than one answer).

• number of bonds in the compound

• ratio of ions in the compound

• elements in the compound

Tags

NGSS.MS-PS1-1