Question

I just need someone to check my work to make sure it's correct.

Answer 1

A scientist adds heat to each of the following substances. Which will probably absorb the most heat before its temperature changes significantly?

50 g of solid copper

50 g of solid iron

50 g of liquid water ►

50 g of sand

Answer 2

A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lose a lot of energy, the hydrogen bonds hold them relatively far apart. Based on this information, what can the scientist infer about the substance?

It expands when it freezes.╖

It is highly colored.

It exists only as a gas.

It does not dissolve ionic compounds.

Answer 3

Which of these best explains why a paper clip can float on water?

Water has a very high specific heat.

Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid. ☻

The metal in the paper clip has a lower mass than the water.

Water molecules near the surface produce more buoyant force than water molecules within the liquid.

Answer 4

Which of these best explains why the hydrogen atoms in a water molecule are attracted to Cl− ions in sodium chloride (NaCl)?

The hydrogen atoms have +1 charges.

The hydrogen atoms share electrons equally with the oxygen atom.

The hydrogen atoms have partial positive charges.☻

The hydrogen atoms form covalent bonds with the chloride ions.

Answer 5

☻ yeah you got it

Answer 6

can i have a medal?

Answer 7

Sure.

Answer 8

do you have e-mail?

Answer 9

xD

Answer 10

I just took the test and found #1 is right #2 I don't know #3 is right and #4 I am not sure either