MJU4 Lesson 1 and 2 Flashcard

Front

What principle is demonstrated when products have different properties than the reactants?

Back

This principle states that during a chemical reaction, the substances that react (reactants) can change into new substances (products) that have different physical and chemical properties.

Front

What is a renewable natural resource?

Back

A renewable natural resource is a resource that can be replenished naturally over time, such as wood, which can be regrown.

Front

What stage of the life cycle do crumb-rubber pellets from used tires represent?

Back

Consumer use; this stage refers to the period when the product is being used by consumers before it is disposed of.

Front

Which material is a good conductor of electricity?

Back

Copper; it allows electricity to flow through it easily, making it ideal for electrical wiring.

Front

What is an example of a material not made of synthetic materials?

Back

Cotton t-shirt; it is made from natural fibers, unlike synthetic materials such as plastic.

Front

What is the definition of a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is the definition of a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What does it mean when energy is released in a chemical reaction?

Back

It means that the reaction is exothermic, where heat is produced as the reactants transform into products.

Front

What does it mean when energy is absorbed in a chemical reaction?

Back

It means that the reaction is endothermic, where heat is taken in from the surroundings.

Front

What is the difference between renewable and non-renewable resources?

Back

Renewable resources can be replenished naturally (like wood), while non-renewable resources cannot be replaced once used (like oil).