Law of Conservation of Mass Study Quizziz

How many Calcium atoms are in this compound? 
Ca (OH)₂

• 2
• 3
• 1
• 4

How many Sulfur atoms are in this compound? 
Al₂(SO₄)₃

• 4
• 2
• 3
• 1

Is this equation balanced or unbalanced? 
H₂ + O₂ --> H₂O

• balanced
• unbalanced

Is this equation balanced or unbalanced?

CH₄ + 2O₂--> CO₂+ 2H₂O

• balanced

• unbalanced

12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 

• 28 g
• 4g
• 30g
• 12g

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, changed
• None of the above

The number to the lower side of an element is a 

• Subscript
• Superscript
• Coefficient
• Charge

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

A chemical reaction is balanced when

• both sides have the same elements
• Both sides have the same  number of atoms
• Same subscripts
• Same coefficients

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products