Chemistry Final Test Unit 5/6

Front

What is synthesis in chemistry?

Back

Synthesis is a type of chemical reaction where two or more simple substances combine to form a more complex product. Example: Na + Br₂ → NaBr.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients in front of the compounds to ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the coefficient of O₂ in the reaction Al + O₂ → Al₂O₃?

Back

The coefficient of O₂ is 3, making the balanced equation: 4 Al + 3 O₂ → 2 Al₂O₃.

Front

How do you calculate the number of moles from grams?

Back

To calculate moles, use the formula: Moles = Mass (g) / Molar Mass (g/mol). For example, 16.94g of water (H₂O) is 0.9401 mol.

Front

What is the molar mass of C₆H₁₂O₆?

Back

The molar mass of glucose (C₆H₁₂O₆) is 180.18 g/mol.

Front

What is the product of the combustion of methane (CH₄)?

Back

The combustion of methane produces carbon dioxide (CO₂) and water (H₂O). The balanced equation is: CH₄ + 2 O₂ → CO₂ + 2 H₂O.

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of substance. It is defined as 6.022 x 10²³ particles (atoms, molecules, etc.).

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is important because it follows the law of conservation of mass, ensuring that matter is neither created nor destroyed in a chemical reaction.

Front

What is the difference between a reactant and a product?

Back

Reactants are substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

Front

How do you find the molar mass of a compound?

Back

To find the molar mass, sum the atomic masses of all atoms in the compound's formula. For example, C₆H₁₂O₆: (6x12.01) + (12x1.008) + (6x16.00) = 180.18 g/mol.