Chemical Changes and 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

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

Law of Conservation of Mass

Back

Mass is never be created or destroyed

Front

Do gasses produced in a reaction have to be accounted for?

Back

False

Front

How many atoms are on the reactants side?
2Mg + O₂ ---> 2MgO 

Back

4

Front

How many oxygen atoms are in this chemical formula? Options: 6 oxygen atoms, 2 oxygen atoms, 3 oxygen atoms, 4 oxygen atoms

Back

6 oxygen atoms