14 Students are given a solid sample and asked to determine whether the sample is

an element, compound, or mixture. One

student observes that the sample is:

• made up of particles of different

colors, sizes, and shapes

• some particles are softer than

others

• some shine while others appear dull

What can the students conclude about

their sample?

F It is an element.

G It is a compound.

H It is a homogeneous mixture.

J It is a heterogeneous mixture.

Which statement can best be concluded from the ideal gas law?

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.