CFE Review: Law of Conservation of Mass and Energy

Front

Law of Conservation of Mass

Back

Mass is never created or destroyed

Front

What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete? Options: They both will weigh the same, The product always weighs more than the reactant, The reactant will weigh more than the product, They both will lose mass after the reaction.

Back

They both will weigh the same

Front

Do gasses produced in a reaction have to be accounted for?

Back

False

Front

Which are chemical changes: Iron rusting, Glass breaking, Clothing ripping, Hair cut

Back

Iron rusting

Front

Can matter be created or destroyed?

Back

No, matter is always conserved

Front

Does the mass change after a physical change, such as ice melting into water?

Back

True

Front

Evidence of a chemical reaction include: Phase change, No new substance, Bubbles forming, Shape change

Back

Bubbles forming

Front

10 g of a solid chemical reacts with 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?

Back

The gas produced weighed 7 g

Front

The Law of Conservation of Energy states:

Back

Energy cannot be created or destroyed, it can only transformed

Front

Energy transformation in animals eating food?

Back

chemical to kinetic