Unit 3 Review

Front

What type of reaction is represented by the equation Zn + HCl → H₂ + ZnCl₂?

Back

Single Replacement: A reaction where one element replaces another in a compound.

Front

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

Back

Mass (g) = Moles × Molar Mass (g/mol). For C₆H₁₂, Molar Mass = 12.01*6 + 1.008*12 = 84.16 g/mol.

Front

How many atoms are in 1 mole of a substance?

Back

1 mole = 6.022 x 10²³ atoms (Avogadro's number).

Front

What is the molar mass of C₆H₁₂?

Back

Molar mass = 84.16 g/mol.

Front

How do you convert moles to molecules?

Back

Molecules = Moles × Avogadro's number (6.022 x 10²³).

Front

What is the formula to find the number of moles from the number of formula units?

Back

Moles = Formula Units / Avogadro's number.

Front

How many moles are in 3.0 x 10²⁴ formula units of FeCl₃?

Back

5.0 moles: 3.0 x 10²⁴ / 6.022 x 10²³ = 5.0 moles.

Front

What is a synthesis reaction?

Back

A reaction where two or more substances combine to form a single product.

Front

What is a decomposition reaction?

Back

A reaction where a single compound breaks down into two or more simpler products.

Front

What is a combustion reaction?

Back

A reaction that involves the burning of a substance in the presence of oxygen, producing heat and light.