Law of Conservation of Mass

Front

Which Chemical Equation is Balanced? CH₄+O₂------CO₂+2H₂O, H₂+O₂-----2H₂O₄, 4Al+3O₂-----2Al₂O₃

Back

4Al+3O₂-----2Al₂O₃

Front

B₂ + 3W₂ => 2BW₃

Back

Balanced

Front

Which are chemical changes: Iron rusting, Glass breaking, Clothing ripping, Hair cut?

Back

Iron rusting

Front

What is the law of conservation of mass?

Back

Within a closed system, mass does not change.

Front

Can matter be created or destroyed?

Back

No, matter is always conserved.

Front

The total amount of matter (atoms) before and after a chemical reaction (change), remains the same.

Back

True

Front

What is the law of conservation of mass?

Back

The mass of the reactants is the same as the mass of the products.

Front

What is the Law of Conservation of mass?

Back

Mass is never created or destroyed

Front

Evidence of a chemical reaction include: Phase change, No new substance, Bubbles forming, Shape change

Back

Bubbles forming

Front

How is a physical change different from a chemical change?

Back

Chemical changes produce a new substance, physical changes stay the same substance.