1.
a.
physical
b.
chemical
c.
chemical
d.
physical
2.
a.
physical
b.
physical
c.
physical
d.
chemical
3.
a.
chemical
b.
physical
c.
chemical
d.
physical
4.
a.
chemical
b.
chemical
c.
physical
d.
physical
5. A is a
chemical change because the color of the apple that turned brown is now permanent.
B is a chemical change because they loose their charge and therefore their
thermal energy is given off. C is a physical change because the oils are
removed; yet the material remains the same. D is a physical change because the
salad dressing separates, but the material stays the same.
6.
a. To make
chocolate chip cookies you must mix milk, flour, eggs, chocolate chips and sugar together
in a bowl. Then you separate the batter into little circles and put it in the
oven to bake. Then the cookies must be taken out of the oven to cool.
b. Mixing all the ingredients
together is a physical change because although the ingredients are mixed, the
materials stay the same. Baking the cookies is a chemical change because it is
a permanent temperature change and forms a solid. Taking out the cookies to
cool is a physical change because the cookies do not change, although it
appears to have changed.
7.
a. metals
b. non-metals
c. non-metals
d. metals
8.
a. metal
b. metalloid
c. non-metal
d. metal
9. Boron (B) and silicon (Si).
10.
a. idoine is a nonmetal – it wold
shattter.
b. zirconium is a metal – it would
flatten.
c. phosphorus is a nonmetal - it
would shatter.
d. nickel is a metal - it would
flatten.
11. Nonmetals don’t conduct
electricity and are not malleable; therefore, nonmetal wiring is unable to bend
or transmit electricity.
12. Metals are suitable for use
in coins because they bend and do not break. They are also shiny and malleable.
No comments:
Post a Comment