chem test

What must be equal on both sides of a balanced chemical equation according to the Law of Conservation of Mass?

The number of atoms of each element.

What is the first step in writing a chemical equation?

Identify reactants and products based on the given reaction.

Which coefficients are adjusted to balance a chemical equation?

Whole numbers before compounds.

What does (aq) symbolize in phase notation?

Aqueous, meaning dissolved in water.

What type of reactions are characterized by hydrocarbons reacting with O₂?

Combustion reactions.

What do you do after writing a total ionic equation?

Remove the spectator ions to write the net ionic equation.

What do most nitrates (NO₃⁻) and alkali metal salts (Na⁺, K⁺) have in common regarding solubility?

They are generally soluble in water.

In a single-replacement reaction, which metals are more likely to replace others?

Higher-ranked metals replace lower-ranked metals.

What do you observe when mixing solutions of AgNO₃ and KBr according to solubility rules?

A white precipitate of AgBr is formed.

How do you confirm a gas is CO₂ in an experiment?

You can bubble it through limewater; it will turn cloudy.

What does a balanced equation reflect about a chemical reaction?

It shows the correct ratio of reactants and products.

What is the net ionic equation for AgNO₃(aq) + NaCl(aq)?

Ag⁺(aq) + Cl⁻(aq) → AgCl(s).

What type of reaction is represented by HCl + NaOH → NaCl + H₂O?

Acid-Base (Neutralization) Reaction.

What happens in a decomposition reaction?

A compound breaks down into simpler substances.

What should be done with waste chemicals according to lab work preparation?

Follow proper disposal methods.