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Chem Extra Credit 3 (Unit 2)

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Questions and Answers

What is the correct chemical formula of magnesium phosphide?

MgP

Mg₂P₃

Mg₃P

MgP₃

Mg₂P

MgP₂

Mg₃P₂ (correct)

Magnesium phosphide is ____ compound.

a covalent

an ionic (correct)

both an ionic and a covalent

How many ions are present in one formula unit of magnesium phosphide?

1.202 x 10²⁴

3.011 x 10²³

6.022 x 10²³ (correct)

Determine the value of the overall energy change for the reaction M(s) + 1/2 X₂(g) → MX(s).

-615 kJ Signup and view all the answers

How many molecules of methanol (CH₃OH) are in 35.6 grams of CH₃OH?

6.68 x 10²³ molecules Signup and view all the answers

Choose the correct formula of magnesium chloride.

MgCl₂ Signup and view all the answers

Choose the correct formula of calcium sulfate.

CaSO₄ Signup and view all the answers

Choose the correct formula of sodium phosphate.

Na₃PO₄ Signup and view all the answers

Choose the element that has the smallest atomic radius.

S Signup and view all the answers

Choose the correct name of this compound P₂S₅.

diphosphorus pentasulfide Signup and view all the answers

Choose the correct name of this compound Li₂S.

lithium sulfide Signup and view all the answers

Choose the correct name of this compound FeF₃.

iron (III) fluoride Signup and view all the answers

Study Notes

Chemical Formulas and Compounds

Magnesium Phosphide is represented by the chemical formula Mg₃P₂; it is an ionic compound.
In one formula unit of magnesium phosphide, there are 6.022 x 10²³ ions present.
The formula for magnesium chloride is MgCl₂.
Calcium sulfate has the formula CaSO₄, formed from Ca²⁺ and SO₄²⁻ ions.
The correct formula for sodium phosphate is Na₃PO₄, composed of three Na⁺ ions and one PO₄³⁻ ion.

Energy Change in Reactions

In the reaction M(s) + 1/2 X₂(g) → MX(s), the overall energy change (Δ Erxn) is -615 kJ.

Molecular Calculations

In 35.6 grams of methanol (CH₃OH), there are approximately 6.68 x 10²³ molecules.

Atomic and Molecular Properties

The element with the smallest atomic radius among Na, Al, S, Mg, Si, and P is Sulfur (S).

Naming Compounds

The name for the compound P₂S₅ is diphosphorus pentasulfide.
Li₂S is correctly named lithium sulfide, which consists of two Li⁺ ions and one S²⁻ ion.
The compound FeF₃ is named iron (III) fluoride, indicating the +3 oxidation state of iron.

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Description

Test your knowledge on magnesium phosphide with this quiz. It covers the correct chemical formula, type of compound, and the number of ions in one formula unit. Perfect for reinforcing your learning in chemistry.