Chemical Reactions

What are the four states of matter?

• Plasma, electric, molecule, gas

• Plasma, gas, solid, liquid

• Plasma, solid, liquid, element

• Plasma, gas, compound, liquid

What are the reactants in this equation?

2H₂ + O₂ → 2H₂O

• 2H₂ + O₂

• 2H₂O

• 2H₂ + O₂ → 2H₂O

• All the above

What are the products of this equation?

Mg + 2HCl → MgCl₂ + H₂

• Mg + 2HCl → MgCl₂ + H₂

• Mg + 2HCl

• MgCl₂ + H₂

• All of the above

What is an example of an element?

• something you cook on

• Potassium

• Water

• calcium chloride

What is an example of a compound?

• salt

• water

• baking soda

• all of the above

What is the definition of a reaction?

• A chemical reaction is when something (product) is changed into a new thing (reactant).

• A chemical reaction is when something (product) is changed into a new thing (product).

• A chemical reaction is when something (reactant) is changed into a new thing (reactant).

• A chemical reaction is when something (reactant) is changed into a new thing (product).

Which of these is an example of a chemical reaction?

• rust

• photosynthesis

• all are chemical reactions

• combustion

What is a sign a chemical reaction has occurred?

• colour change

• gas produced

• precipiate formed (liquid to solid)

• all of these are signs a chemical reaction has occurred

Which one shows that a chemical reaction has occurred?

• dissolving

• melting

• formation of a gas

• bending

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper