Q4.PS11.Quiz#3

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

What is the arrow in a chemical equation...

H_{2 +} O₂ --> H₂O

• Reactants

• Products

• Yields

• Chemical Equation

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

• charge
• subscript
• random number
• coefficient

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

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H₂SO₃ + __KOH--> __H₂O+ __K₂SO₃

• 2,1 --> 2,1
• 1,2 --> 1,1
• 1,2 --> 1,2
• 1,2 --> 2,1

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H₂ + __S --> __H₂S

• 1,1 --> 1
• 2,2 --> 2
• 1,2 --> 1
• 1,2 --> 2