M19 L1 Notes Flashcardizz - Chemical Changes

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

Front

What is the assumed coefficient when no coefficient appears in a chemical equation?

Back

1 (one)

Front

How do you calculate the mass of a substance from moles?

Back

Mass (g) = Moles × Molar Mass (g/mol). For example, for calcium (Ca), 3.000 mol × 40.08 g/mol = 120.24 g.

Front

Identify the reactants in the equation: Cd(NO₃)₂(aq) + H₂S(g) ⟶ CdS(s) + 2HNO₃(aq).

Back

Reactants: Cd(NO₃)₂ (aq), H₂S (g)

Front

Identify the products in the equation: Cd(NO₃)₂(aq) + H₂S(g) ⟶ CdS(s) + 2HNO₃(aq).

Back

Products: CdS (s), 2HNO₃ (aq)

Front

What is the molar mass of carbon dioxide (CO₂)?

Back

44.01 g/mol

Front

How do you find the mass of 5 moles of carbon dioxide?

Back

Mass = 5 mol × 44.01 g/mol = 220.05 g.

Front

What does it mean for a chemical reaction to be exothermic?

Back

An exothermic reaction releases energy, usually in the form of heat, to the surroundings.

Front

What does it mean for a chemical reaction to be endothermic?

Back

An endothermic reaction absorbs energy from the surroundings, usually in the form of heat.

Front

What is the law of conservation of mass?

Back

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