Chemical Reaction Review (Ch. 17)

What is a shorthand method of writing what happens in a chemical reaction?

• chemical equation

• chemical formula

• products

• reactants

Which law requires a balanced chemical reaction to contain the same number of atoms of each element in the products and in the reactants?

• law of conservation of mass

• law of conservation of energy

• law of motion

• law of thermodynamics

What does the rate of reaction measure?

• how quickly a reaction occurs

• the number of atoms in a reaction

• the mass of the reaction

• how long it takes to clean up when the lab is done

What is activation energy?

• minimum energy needed to start a reaction

• energy needed to get your attention

• energy needed to stop the experiment

• energy needed to set up the lab

Which of these is a chemical change?

• Soap scum forms

• Paper is shredded

• Liquid wax turns solid

• Raw egg is broken

A balanced chemical equation must have the same number of which of these on both sides of the equation?

• atoms

• reactants

• molecules

• compounds

What should be balanced in a chemical equation?

• atoms

• compounds

• molecules

• molecules and atoms

Which of the following is an example of a physical change?

• water freezing into ice

• a piece of wood burning

• a toy car rusting

• zinc producing hydrogen gas when mixed with water

What type of change has occurred when a nail rusts?

• A chemical change

• A physical change

• An atomic change

• A reactive change

Which term best describes the two substances that react to form salt?

• toxic

• delicious

• nutritious

• edible