What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

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

• Destroyed a little bit

• Invisible

• Transformed, changed

• None of the above

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

The Law of Conservation of matter states that the total amount of matter ______________ after it undergoes change.

• disappears
• stays the same
• weighs less
• explodes

An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?

• 15 grams
• 25 grams
• 20 grams

When a chemical reaction occurs...

• New molecules and atoms are formed

• Molecules and atoms are rearranged

• Molecules and atoms disappear

• Molecules and atoms are destroyed

where are the products in an equation?

• The products are on the right side of the equation

• The products are on the left side of the equation

where are the reactants in an equation?

• The reactants are on the left side of an equation

• the reactants are on the right side of an equation

Organelle in the cell that stores water, waste and food. 

• Chloroplast
• Vacuole
• Ribosome
• Smooth ER

Protective barrier that surrounds all cell types that controls what enters and leaves the cell.

• nuclear membrane
• cytoplasm
• Cell wall 
• Cell membrane