Conservation of Mass - Modified

Open Ended

State which of the three equations shows a chemical reaction. Explain your choice in terms of conservation of mass.

Multiple Choice

In this image, what are the information to the right of the arrow (in black) is called the_______.

• Product
• Reactant
• Chemical Subscript

Open Ended

Explain how the Law of Conservation of Mass relates to balancing a chemical equation. Give an example.

Categorize

Options (4)

CO₂

H₂O

O₂

C₁₀H₂₂

In the equation pictured here, which substances are products? Which are reactants?

Products

Reactants

Multiple Choice

Which of the following proves the Law of Conservation of Mass?

• thermal energy is produced
• a balanced chemical equation
• chemoluminescence
• formation of a precipitate

Multiple Choice

AB → A + B

In the reaction above, reactant AB has a mass of 12 grams and product B has a mass of 5 grams. How many grams should product A have?

• 17g

• 2g

• 7g

• 5 grams

Fill in the Blank

This is the decomposition reaction of hydrogen peroxide. According to the law of conservation of mass, if you start with 40g of hydrogen peroxide you should end up with _____g of water and oxygen combined.

Open Ended

Two students combine unknown substances during a chemical reactions investigation. How will the product MOST LIKELY present itself?

Dropdown

Examine the experiment shown, then fill in the blanks.



The experiment shows a ​

Select answer

system.

The mass at the end of the experiment will be ​

Select answer

the initial mass.