Molar Mass and Formula Mass and Ionic Compounds

The first step in naming an ionic compound is always...

• Naming the anion (non-metal)

• Changing the ending to -ide

• Naming the cation (metal)

• Writing the cation charge

Answer explanation

The first step in naming an ionic compound is to name the cation (metal) first, followed by the anion. This establishes the order of the components in the compound's name, making 'naming the cation' the correct choice.

Li⁺ and P^3- create...

• Li₃P

• LiP₃

• LiP

• Li₂P

Answer explanation

Li⁺ has a +1 charge and P^3- has a -3 charge. To balance the charges, three Li⁺ ions are needed for each P^3- ion, resulting in the formula Li₃P.

Tags

NGSS.HS-PS1-2

Which of these combinations is an ionic compound made of?

• Metal and Metal

• Nonmetal and Nonmetal

• Metal and Nonmetal

• Cation and Cation

Answer explanation

Ionic compounds are formed when metals react with nonmetals. Metals lose electrons to become cations, while nonmetals gain electrons to become anions, resulting in the formation of ionic bonds. Thus, the correct combination is Metal and Nonmetal.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is an ionic compound:

• CH₄

• I₂

• LiBr₂

• CO

Answer explanation

LiBr2 is an ionic compound because it consists of lithium (Li) and bromine (Br), which form ions. CH4, I2, and CO are covalent compounds, lacking the ionic bond characteristic of LiBr2.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

How do the following two elements bond together?
Al³⁺  O^2-         

• AlO

• Al₂O₃

• Al₃O₆

• Al₃O₂

Answer explanation

Al³⁺ and O^2- combine in a ratio that balances their charges. Two Al³⁺ ions (total +6) bond with three O^2- ions (total -6), resulting in the formula Al₂O₃.

Tags

NGSS.HS-PS1-2

The Chemical Symbol for Tungsten

Answer explanation

The chemical symbol for Tungsten is 'W', derived from its German name 'Wolfram'. This symbol is used universally in the periodic table to represent Tungsten.

Which of the following is the correct chemical formula for Lithium Oxide?

Answer explanation

Lithium Oxide is formed from lithium (Li) and oxygen (O). Each lithium atom contributes one electron, and oxygen needs two electrons to complete its valence shell, requiring two lithium atoms. Thus, the correct formula is \(\text{Li}_2\text{O}\).

The Chemical Symbol for Mercury

Answer explanation

The chemical symbol for mercury is 'Hg', derived from its Latin name 'hydrargyrum'. This symbol is used universally in chemistry to represent mercury.

• Iron chloride

• Iron(I) chloride

• Iron(II) chloride

• Iron(III) chloride

Tags

LT 8.7

LT 8.5

Monatomic Cations get their names directly from the ____________ ________?

Answer explanation

Monatomic cations are positively charged ions formed from single atoms, and their names are derived directly from the element's name found in the Periodic Table.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2