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.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

he would use the colour black

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72