OSE 7.1 Chemical Reaction Lesson 2

Front

What is the principle of conservation of mass?

Back

The principle of conservation of mass states that in a closed system, the total mass remains constant before and after a chemical reaction, as long as no mass escapes.

Front

What does it mean if a gas is not present in a substance?

Back

If a gas is not present in a substance, it indicates that the substance does not release gas when undergoing a reaction or that the gas is not formed during the process.

Front

How can we observe that gas has mass?

Back

We can observe that gas has mass by noting that when gas escapes from a closed container, the mass of the container decreases.

Front

What does it indicate if the mass does not change after a reaction?

Back

If the mass does not change after a reaction, it indicates that the products of the reaction were already present in the reactants.

Front

What does it mean if a bag does not inflate when a bath bomb is crushed?

Back

If the bag does not inflate, it suggests that no gas is being produced or trapped inside the bath bomb.

Front

What is a chemical reaction?

Back

A chemical reaction is a process where substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What is the role of water in a bath bomb reaction?

Back

Water activates the ingredients in a bath bomb, leading to a chemical reaction that produces gas and fizzing.

Front

What is an example of a gas produced in a chemical reaction?

Back

An example of a gas produced in a chemical reaction is carbon dioxide, which can be released when baking soda reacts with vinegar.

Front

Why is it important to conduct experiments in a closed system?

Back

Conducting experiments in a closed system is important to accurately measure changes in mass and observe the conservation of mass.

Front

What happens to the mass of a system when gas escapes?

Back

When gas escapes from a system, the total mass of the system decreases because the mass of the gas is no longer included.