Chemical Reactions

Chemical Reactions

what is a chemical change?

Choose the answer best close to your thinking

Multiple Choice

what is a chemical change?

• making mixtures

• two or more substances combine together to form the same substances

• two or more substances combine together to form a new substance

• changes mass and density of substances

Chemical Changes

Matter change into other substances with different chemical and physical properties

The law of conservation of mass

the law states that the total mass before chemical reaction is the same as the total mass after the chemical reaction

Na + Cl = NaCL

The total mass of the reactants equals the mass of the product

Multiple Choice

If the mass of Na is 22 and the mass Cl is 35. what is the mass of NaCl

• 40

• 57

• 62

• 22

Which means that the mass has to have the same number of both sides of the equation

Na + Cl = NaCl

22 + 35 = 55

Chemical Reactions

• Reactants

• Products

Multiple Choice

H2 + O2 = H20

which is the product of the reaction?

• H2O

• H2

• O2

• All of the above