Chemical Equations Intro

• NaCl

• Product (1)

• Na₂O

• Reactant (2)

• Fe₂O₃

• Reactant (1)

• FeCl₃

• Product (2)

Answer explanation

Reactants are all the compounds on the left, products are on the right of the arrow.

If reaction starts with 20g of reactants, it will produce ---

• a total of 40g of product

• a total of 10g of product

• a total of 80 g of product

• a total of 20g of product

How many of each type of atom are in the formula NH₃?

• 1 nitrogen, 3 hydrogen

• 3 nitrogen, 3 hydrogen

• 1 neon, 3 hydrogen

• 1 nitrogen, 3 helium

In a reaction A + B ----> C.

Reactant A has 5g and product C has 9g.

How many grams does reactant B should have?

• 4g

• 5g

• 9g

• 14g

What will have more mass when a chemical change is complete: the reactants before the chemical reaction or the product after the reaction is complete?

• They both will have the same mass

• The product always has more mass than the reactant

• The reactant will have more mass than the product

• They both will lose mass after the reaction

The Law of Conservation of Matter states that the total amount of matter _____ after it undergoes change.

• disappears

• stays the same

• weighs less

• explodes

What is the right part of a chemical equation called?

2H_{2 +} O₂ --> 2H₂O

• Reactants

• Products

• Yields

• Chemical Equation

Fe(PO₃)₄

Fe = ​ (a)   ​ P = ​ (b)   O = ​ (c)  

• 1
• 4
• 12
• 2
• 3
• 15
• 10

Ca(OH₂)₂

Ca = ​ (a)   O = ​ (b)   H = ​ (c)  

• 1
• 2
• 4
• 3
• 5
• 6

C₃H₈

C = ​ (a)   H = ​ (b)  

• 3
• 8
• 2
• 1
• 4
• 5
• 6