Week 3 - Law of Conservation of Mass

Front

Law of Conservation of Mass

Back

Mass is never created or destroyed

Front

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have? Options: 4g, 5g, 9g, 14g

Back

4g

Front

The number in front of a compound or element is a

Back

Coefficient

Front

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

Back

Transformed, changed

Front

Which chemical equation is balanced? Options: CH₄+O₂------CO₂+2H₂O, H₂+O₂-----2H₂O₄, 4Al+3O₂-----2Al₂O₃

Back

4Al+3O₂-----2Al₂O₃

Front

If a reaction starts with a total 75g of reactants, it should produce:

Back

a total of 75g of products

Front

Bob puts 200 grams of ice into a pitcher with 900 grams of water. How many grams of water does Bob now have in the pitcher?

Back

1,100 g

Front

When is a chemical reaction balanced?

Back

Both sides have the same number of atoms

Front

Which of these is not a chemical reaction? Options: Burning of wood, Milk going bad, Mixing vinegar and baking soda, Melting of ice

Back

Melting of ice

Front

The coefficient in  3H₂O is

Back

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