MS-PS1-5

What is a shorthand notation that represents a compound or molecule called?

• Chemical Equation
• Chemical Formula
• Chemical Reaction
• Chemical

Chemical Equation

• A representation of a chemical reaction

• the starting materials in a chemical reaction

• the new substances that are formed in a chemical reaction

• tells how many atoms, molecules, or formula units take part in a reaction

How many oxygen atoms are in this chemical formula?

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

There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

• 47g
• 13g
• 23g 
• You cant tell with the given information

Is this equation balanced?

• yes
• no
• Not enough information

Which section represents the reactants?

• A

• B

• C

Why does this picture demonstrate the Law of Conservation of Mass?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Mass

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

Air is an example of a

• solid
• liquid
• gas

Is this equation balanced?

• yes

• no

• Not enough information