Conservation of Mass LAB (DOK)

What is the purpose of the lab in Lesson 71?

• To explore changes in mass that may occur during chemical or physical changes.

• To demonstrate the different states of matter.

• To learn about the periodic table of elements.

• To practice laboratory safety procedures.

Which of the following materials is NOT listed as required for the lab in Lesson 71?

• Balance

• 1.0 M Na₂CO₃(aq), 40 mL

• 1.0 M CaCl₂(aq), 20 mL

• 1.0 M H₂SO₄(aq), 20 mL

In Part I: Predict the Mass, what are students asked to do for each equation?

• Calculate the exact mass of reactants and products.

• Predict whether the reactant or the products will have greater mass.

• Write a detailed report on the experimental results.

• Measure the volume of reactants and products.

What is the result of adding water to solid sodium chloride according to Equation 1 in the lab?

• NaCl(s) → NaCl(aq)

• NaCl(aq) → NaCl(s)

• NaCl(s) + H₂O(l) → NaCl(aq) + H₂(g)

• NaCl(aq) + CO₂(g) → NaCl(s)

What are the products of the reaction in Equation 2 when aqueous sodium carbonate is added to aqueous calcium chloride?

• Na₂CO₃(aq) and CaCl₂(aq)

• NaCl(aq) and CaCO₃(s)

• NaCl(s) and CaCO₃(aq)

• Na₂CO₃(s) and CaCl₂(s)

What additional products are formed in Equation 3 when aqueous sodium carbonate is added to acetic acid, water, and carbon dioxide gas?

• Na₂CO₃(aq) and H₂O(l)

• Na₂CH₃CO₂(aq) and CO₂(g)

• Na₂CH₃CO₂(aq) and H₂O(l)

• Na₂CO₃(aq) and CH₃CO₂H(aq)

What is the physical state of sodium chloride after it reacts with water according to the experiment described in Part 2?

• White cubic crystals

• Clear or slightly cloudy liquid

• White solid chunks

• Clear liquid

What is the total mass before mixing sodium chloride with water in the experiment? (Closest Answer)

• 21 g

• 0 g

• 2.1 g

• 44 g

According to the chemical equation in Part 2, what is the product formed when sodium carbonate reacts with calcium chloride?

• NaCl_(aq)

• CaCl_2(aq)

• Na2CO_3(aq)

• CaCO_3(s)

What is the description of the product calcium carbonate after the reaction between sodium carbonate and calcium chloride?

• Clear or slightly cloudy liquid

• White solid chunks

• Clear liquid

• White cubic crystals