Conservation of Mass

Conservation of Mass

​The reaction between Magnesium and Oxygen (Burning Magnesium in air)

Multiple Choice

Substances present at the start of a chemical reaction are called ____.

• subscripts
• coefficients
• reactants
• products

Multiple Choice

Substances present at the start of a chemical reaction are called ____.

• subscripts
• coefficients
• reactants
• products

Multiple Choice

Substances that form as the result, or at the end, of a chemical reaction are called ____.

• products
• reactants
• coefficients
• subscripts

​https://www.youtube.com/watch?v=casNoSzuma4

​According to the law of consevation of mass,


ΣMass of reactants = ΣMass of products

Multiple Choice

Mg + F → MgF

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride.

• 62 
• 38
• 24
• 14

Multiple Choice

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

Multiple Choice

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

• Originator

• Reactant

• Product

• Produce

Multiple Choice

When a log is burned, what happens to the wood?

• The mass stays the same, but becomes smoke and ash.

• It disappears.

• The mass changes as it goes away.

• Nothing. You're imagining things.