Chemical Reactions and Conservation of Matt Common Assessmen

Iron rusting: Physical or Chemical?

• Physical

• Chemical

Water boiling: Chemical or Physical?

• Chemical

• Physical

Sugar Dissolving: Physical Chemical?

• Physical

• Chemical

Eggs Cooking: Physical or Chemical?

• Chemical

• Physical

when using a instant cold pack, water mixes with a chemical and the pack gets very cold. This is an example of

• endothermic reaction

• exothermic reaction

• combustion reaction

• physical change

How are natural material and synthetic materials different from one another?

• Natural fibers are produced from materials made by plants or animals while synthetic fibers are produced by chemical changes to raw materials.

• Natural fibers form threads that are woven to form cloth while synthetic fibers are linked together chemically to form cloth.

• Natural fibers and synthetic fibers both come from plant sources but synthetic fibers are modified chemically to become stronger.

• Natural fibers are not colored with dye but synthetic fibers are dyed many colors.

Nylon is a synthetic material. Being that it is synthetic, which is nylon most likely made from?

• hazardous chemicals that are harmful to the environment

• natural resources like coals, water and air.

• silk

• complex combinations of other synthetic materials

Which best describes an electron

• no charge and the same mass as a proton.

• has a negative charge and less mass than a proton.

• has a positive charge and more mass than a neutron.

• has a positive charge and less mass than a proton.

If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 

• 2

• 4

• 6

• You need more information to answer this question

How does the mass on the reactants side compare to the mass on the product side of an equation?

• they are the same

• They are different

• It is much bigger

• It is much smaller