Law of conservation of mass

Front

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

Back

Transformed, changed

Front

The number to the lower side of an element is a

Back

Subscript

Front

The number in front of a compound or element is a

Back

Coefficient

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

3

Front

If reaction starts with 20g of reactants, it should produce? Options: a total of 40g of products, a total of 10g of products, a total of 80g of products, a total of 20g of products

Back

a total of 20g of products

Front

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

Back

4g

Front

What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete? Options: They both will weigh the same, The product always weighs more than the reactant, The reactant will weigh more than the product, They both will lose mass after the reaction.

Back

They both will weigh the same

Front

Measure of the amount of matter

Back

mass