Honors Chemistry Unit 4 Practice Test

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

What is the chemical formula for magnesium hydroxide?

Back

The chemical formula for magnesium hydroxide is Mg(OH)₂.

Front

What does VSEPR Theory stand for?

Back

VSEPR stands for Valence Shell Electron Pair Repulsion Theory, which predicts the shape of molecules based on the repulsion between electron pairs.

Front

What molecular shape does a molecule with a steric number of 3 and one lone pair have?

Back

A molecule with a steric number of 3 and one lone pair has a bent molecular shape.

Front

What type of reaction is represented by the equation H₂O → H₂ + O₂?

Back

This reaction is a decomposition reaction, where a single compound breaks down into two or more products.

Front

What is the molecular shape of a compound with two double bonds and no lone pairs on the central atom?

Back

The molecular shape of a compound with two double bonds and no lone pairs on the central atom is linear.

Front

Define a decomposition reaction.

Back

A decomposition reaction is a type of chemical reaction where one reactant breaks down into two or more products.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their quantities.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the law of conservation of mass is upheld, meaning the number of atoms for each element is the same on both sides of the equation.

Front

What is a steric number?

Back

The steric number is the number of atoms bonded to a central atom plus the number of lone pairs of electrons on that central atom.