Law of Conservation of Matter Quiz

What does the law of conservation of matter state?

• Matter is destroyed in physical changes.

• Matter can be created and destroyed.

• Matter is always created in chemical reactions.

• Matter can change form but not be created or destroyed.

How did scientists confirm the law of conservation of matter?

• By counting the number of molecules.

• By measuring the mass of reactants and products.

• By changing the temperature of reactions.

• By observing color changes in reactions.

In the lead nitrate and potassium iodide reaction, what is the significance of a closed system?

• It prevents matter from entering or leaving.

• It increases the reaction speed.

• It changes the mass of the reactants.

• It allows matter to escape.

What is formed when iron reacts with oxygen?

• Iron sulfate

• Iron nitrate

• Iron chloride

• Iron oxide

In the rust formation example, what remains constant before and after the reaction?

• The color of the reactants

• The temperature

• The number of atoms

• The volume of the reactants

What happens to atoms during a chemical reaction according to the law of conservation of matter?

• They are destroyed.

• They disappear.

• They are created.

• They are rearranged.

What is the technical name for rust?

• Iron chloride

• Iron oxide

• Iron sulfate

• Iron nitrate

What is the total mass of the reactants in the tin and hydrogen fluoride reaction?

• 200.0 g

• 118.7 g

• 158.2 g

• 40.2 g

If the mass of the reactants is 158.2 g, what is the mass of the products?

• 158.2 g

• 140.0 g

• 160.0 g

• 150.0 g

What is the main takeaway from the mass calculation example?

• The mass of reactants is always less.

• The mass of products is always greater.

• The mass of products is always less.

• The mass of reactants equals the mass of products.