PS7 T9L3 Quiz - Balancing Equations

How many atoms of each element in the REACTANTS?

2H₃PO₄ + 3Mg(OH)₂ --> Mg₃(PO₄)₂ + 6H₂O

• P

• 3

• O

• 2

• H

• 14

• Mg

• 12

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

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

H_{2 +} O₂ --> H₂O

• Reactants

• Products

• Yields

• Chemical Equation

What is the arrow in a chemical equation...

H_{2 +} O₂ --> H₂O

• Reactants

• Products

• Yields

• Chemical Equation

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Al + __O₂--> __Al₂O₃

• 4,1 --> 2
• 4,3 --> 4
• 3,4 --> 1
• 4,3 --> 2

Choose the answer that balances this equation.

H_{2 +} O_{2 -->} H₂O

• 2H_{2 +} O_{2 -->} 2H₂O

• 2H_{2 +} 2O_{2 -->} H₂O

• H_{2 +} 2 O_{2 -->} 2H₂O

• balanced already

If I have 100 grams of reactants, how many grams of products should I have?

• 0g

• 100g

• 50g

• 75g