Law of Conservation/Chemical Reactions Review 2

Identify the PRODUCTS in the following chemical reaction:

Chromium Oxide + Carbon --> Chromium + Carbon Monoxide

• chromium and carbon

• chromium and carbon dioxide

• chromium and carbon monoxide

• chromium oxide and carbon

Represents the number of units of each substance that take part in the reaction.

• Product

• Reactant

• Coefficient

• Subscript

• Law of Conservation of Mass

On the left side of the reaction. These are the chemicals that you start with.

• Product

• Reactant

• Coefficient

• Subscript

• Law of Conservation of Mass

Shows how many atoms are in a formula for an element.

• Product

• Reactant

• Coefficient

• Subscript

• Law of Conservation of Mass

The law of conservation of mass states that....

• Matter can be made
• Matter can be destroyed
• Matter can neither be made or destroyed

Which of the following symbols is not a correct indication of the phase of a substance in a reaction? 

• (s)=solid
• (g)=grams
• (l)=liquid
• (aq)= aqueous

How many oxygen atoms are in this chemical formula?

• 7 oxygen atoms
• 4 oxygen atoms
• 3 oxygen atoms
• 1 oxygen atoms

How many molecules are in this chemical formula?

• 5 molecules
• 4 molecules
• 2 molecules
• 6 molecules

What are the reactants in the following chemical equation? 
2H₂ + O₂   -->   2H₂O

• H₂
• O₂
• 2H₂ + O₂
• 2H₂O

At the end of a chemical reaction, what is the total mass of the reactants compared to the total mass of the products?

• the product is double the mass
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction