ChemB Test: Balancing Equations

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

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

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

The blue numbers in the image below represent ________

• I don't know, and don't want to try
• coefficients
• subscripts
• none of the answers are correct

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

What is the right part of a chemical equation called...

H_{2 +} O₂ --> H₂O

• Reactants

• Products

• Yields

• Chemical Equation

How many Elements are in the compound C₂H₈O ?

• 2
• 1
• 3
• 0

How many total atoms are in the compound C₂H₈O ?

• 11
• 2
• 8
• 1

How many Magnesium are in 10MgCl₂?

• 10
• 5
• 20

Balance this equation:
 2Li + Cl₂ -> LiCl

• 2Li + Cl₂ -> 4LiCl2
• 2Li + Cl₂ -> LiCl₂
• 2Li + Cl₂ -> 2LiCl