What is the main focus of the unit titled 'Chemical Names and Formulas'?

• Covalent Compounds

• Ionic Compounds

• Organic Compounds

• Metallic Compounds

Answer explanation

The unit 'Chemical Names and Formulas' primarily focuses on Ionic Compounds, which are formed from the transfer of electrons between metals and nonmetals, leading to the formation of charged ions.

Fill in the blank: The unit 'Chemical Names and Formulas' is specifically about converting _______ to names for ionic compounds.

• Names

• Formulas

• Equations

• Reactions

Answer explanation

The unit 'Chemical Names and Formulas' focuses on converting formulas to names for ionic compounds. Therefore, the correct answer is 'Formulas', as it indicates the starting point for the conversion process.

What is the chemical name for the ionic compound NaCl?

• Sodium Chloride

• Sodium Oxide

• Sodium Nitrate

• Sodium Sulfate

Answer explanation

The chemical name for NaCl is Sodium Chloride. It consists of sodium (Na) and chloride (Cl) ions, making it a common ionic compound known as table salt.

What is the chemical name for the ionic compound LiF?

• Lithium Fluoride

• Lithium Chloride

• Lithium Bromide

• Lithium Iodide

Answer explanation

LiF is composed of lithium (Li) and fluorine (F). The correct chemical name for this ionic compound is Lithium Fluoride, as it combines lithium ions with fluoride ions.

Which of the following is the correct Roman numeral for the transition metal in the compound MnO2?

• I

• II

• III

• IV

Answer explanation

In MnO2, manganese (Mn) has a +4 oxidation state. The Roman numeral representing this oxidation state is IV, making the correct answer IV.

Fill in the blank: The chemical formula CaI2 corresponds to the compound ______.

• A) Calcium Iodide

• B) Calcium Bromide

• C) Calcium Chloride

• D) Calcium Fluoride

Answer explanation

The chemical formula CaI2 indicates that it contains calcium (Ca) and iodine (I). Therefore, the compound is named Calcium Iodide, making option A the correct choice.

Tags

NGSS.MS-PS1-1

Fill in the blank: The compound Calcium Iodide has the chemical formula ______.

• CaI2

• CaBr2

• CaCl2

• CaF2

Answer explanation

Calcium Iodide consists of one calcium (Ca) ion and two iodide (I) ions, resulting in the formula CaI2. The other options represent different compounds with other halogens.

Tags

NGSS.MS-PS1-1

What is the general rule for determining the charge on a cation for elements with more than one possible charge?

• Use the charge on the anion

• Use the atomic number

• Use the atomic mass

• Use the electron configuration

Answer explanation

The general rule for determining the charge on a cation with multiple possible charges is to use the charge on the anion. This helps balance the overall charge in a compound, ensuring electrical neutrality.

What is the chemical formula for Copper (I) phosphide?

• CuP

• Cu3P

• Cu2P

• CuP3

Answer explanation

Copper (I) phosphide has the formula Cu3P. This indicates that three copper (Cu) atoms combine with one phosphorus (P) atom, reflecting the +1 oxidation state of copper in this compound.

Which of the following correctly represents the charge balance in Copper (I) phosphide?

• A) +3/3=+1

• B) +2/2=+1

• C) +1/1=+1

• D) +4/4=+1

Answer explanation

Copper (I) phosphide has a +1 charge for copper (Cu) and a -3 charge for phosphide (P). The correct charge balance is +1/-3, which simplifies to +1, making option A) +3/3=+1 the correct representation.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2