Chemical Reactions

conductivity is a property of metals

• true

• false

A colour change is an evidence of chemical reaction

• true

• false

stretching a rubber band is an example of

• physical

• chemical

• nuclear

• combustion

Ice melting is an example of chemical change

• yes

• no

• never

• dont know

which of the following would indicate a chemical change

• a new substance formed

• a gas given off

• the reaction mixture became hotter

• all of the above

Is sugar dissolving in water a chemical or physical change

• physical

• chemical

• nuclear

• precipitation

condensation is the change of state from

• solid to liquid

• liquid to gas

• gas to liquid

• solid to liquid

in the chemical reaction iron + sulphide ---> iron sulphide which statement is true

• Iron is the only reactant others are products

• sulphide is the only reactant others are products

• iron sulphide is the only reactant others are products

• Iron and sulphide are reactants and iron sulphide is a product

a catalyst undergoes changes in a chemical reaction

• true

• false

a catalyst speeds up a chemical reaction

• true

• false