Unit 3 Review (PS & Mix/P&C Changes/Consv of Mass)

Front

What is a heterogeneous mixture?

Back

A mixture where the components are not uniformly distributed, and different parts can be seen, such as salad or cereal with milk.

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout, such as saltwater or air.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a compound or element to indicate how many molecules or atoms are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.

Front

What is the law of conservation of mass?

Back

A principle stating 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 a balanced chemical equation?

Back

An equation where the number of atoms for each element is the same on both sides, indicating that mass is conserved.

Front

What is potassium hydroxide (KOH)?

Back

A strong base that feels slippery and is commonly used in cleaning products.

Front

What is an acid?

Back

A substance that donates protons (H⁺ ions) in a solution and typically has a sour taste, such as vinegar.

Front

What is a base?

Back

A substance that accepts protons (H⁺ ions) or donates hydroxide ions (OH⁻) in a solution, often feeling slippery.

Front

What is an example of a chemical reaction?

Back

The reaction of hydrogen and oxygen to form water: 2H₂ + O₂ → 2H₂O.