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Chemistry: Ionic Compounds & Reactions

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Questions and Answers

What is the correct approach to reduce subscripts in the final chemical formula when combining a metal and a polyatomic ion?

Change the subscript of the metal ion only.

Change the subscript of the polyatomic ion inside the brackets.

Always double the subscripts for accuracy.

Never change a subscript in the polyatomic ion. (correct)

When crisscrossing ionic charges between a metal and a polyatomic ion, what happens to the subscripts in the final formula?

They can be simplified if possible. (correct)

They are multiplied by two.

They remain the same as the original charges.

They are replaced by the charge of the metal ion.

Which of the following correctly describes how to write the formula for dinitrogen tetroxide?

N2O4 (correct)

H2N4O

N4O2

N2O2

In a chemical reaction, what is the role of balancing equations?

To ensure that the number of atoms is equal on both sides of the equation. (A) Signup and view all the answers

What is the formula for the combustion of a hydrocarbon?

Hydrocarbon + O2 = Water + CO2 + energy (A) Signup and view all the answers

What is the main characteristic that distinguishes a chemical change from a physical change?

Formation of at least one new substance (D) Signup and view all the answers

Which of the following is an example of a physical property?

Taste (C) Signup and view all the answers

Which step is essential when writing the formula for a compound formed between lithium and sulfur?

Criss-cross the charges to produce subscripts (A) Signup and view all the answers

What would you observe if a chemical change occurred?

A new substance with different properties is formed (A) Signup and view all the answers

Which group in the periodic table does not form ions?

Group 14 (A) Signup and view all the answers

What is the first step in writing the formula for an ionic compound?

Find the charges of the constituent elements (D) Signup and view all the answers

Which of the following describes a polyatomic ion?

A group of atoms that tends to stay together (B) Signup and view all the answers

What rules should be followed when writing the formula for compounds that include polyatomic ions?

Polyatomic ions must always be inside brackets (C) Signup and view all the answers