I need some help with this?

Question

1: Which element is the most abundant on earth?
Water, (H2O)

Hydrogen, (H2)

Oxygen, (O2)

None of the above


2: Oxygen is a diatomic element which means that 2 atoms of oxygen combine to form an oxygen molecule, (O2). The number 2 in (O2) means that this oxygen molecule has _______________.
two atoms of oxygen

two atoms of water

two atoms of hydrogen

none of the above


3: Water, (H2O), contains Oxygen and Hydrogen. The oxygen in water, (H2O) does not have a subscript, which means 1 is understood and there is only 1 oxygen atom in a molecule of water (H2O). Please answer the following: How many Hydrogen atoms are there in a molecule of water, (H2O)?
1

2

3

4


4: Since we are talking about (H2O), it will be important for you to know that hydrogen (H2), like Oxygen (O2), is also diatomic. Which of the following molecules are diatomic?
Fluoride, (F2)

Chlorine, (Cl2)

Nitrogen, (N2)

all of the above


5: A molecule of water, (H2O), is the smallest amount of water that can exist and still retain all the properties of water. H2O represents 1 molecule of water because a number 1 is assumed to be in front of the H. Which of the following represents 1 molecule?
Nitrogen, N2

Chlorine, 2Cl2

Fluoride, 3F2

none of the above


6: 3F2 consists of 3 molecules of F2 (Fluoride) because there is a 3 in front of the F2. Given: S2, how many molecules of Sulfur are there?
1

2

3

4


7: Given: KI, potassium iodide. How many molecules of potassium iodide are there?
1

2

3

4


8: In the preceding problem you were given the chemical formula for potassium iodide, KI. Please notice that in the compound KI, there is no space typed between the K and the I. Based on your understanding of this new language you are learning, please choose the compound from those listed below that represents 2 molecules of sodium chloride, which is table salt, symbolized as NaCl:
NaCl

2NaCl

3NaCl

none of the above


9: How many molecules are there in 3NaBr?
1

2

3

none of the above


10: The chemical formula for Ozone is O3. Please determine the number of molecules in the following amount of ozone, 5O3.
1

2

4

5


11: Matter can exist in three states: Solid, Liquid or a Gas. Is the oxygen, O2 that we come into contact every day, a solid, liquid or a gas?
O2 is a solid

O2 is a liquid

O2 is a gas

none of the above


12: Water, H2O, commonly exists as a solid, a liquid, or a gas. The air we breathe contains N2, O2, water vapor and a few trace elements. When there is a lot of water vapor in the air, we say that the weather is humid. How many water molecules are in 10 H2O?
5

10

15

20

Answer 1

This looks a lot like a homework assignment.
1) Oxygen is the most abundant but perhaps not as H2O or O2.
2) two atoms of oxygen
3) 2
4) all of the above
5) Nitrogen, N2
6) 1
7) 1
8) 2NaCl
9) 3
10) 5
11) O2 is a gas
12) 10

Did you even try any of these?

Answer 2

1: oxygen, in all states. But water is not an element.
2: two atoms of oxygen. Again, water is not an atom.
3: two
4: all of the above. And also Br2, I2, for example.
5: nitrogen, N2
This is your homework I'm doing, right? ;)
6: Only one molecule which consists of two atoms of sulphur
7: One, but potassium iodide is not a molecule, but ionic crystal. And this is only a unit which represents the ratio between potassium and iodine.
8: 2NaCl, if you insist. But NaCl is also ionic compound
9: Three. And believe it or not, this is also ionic:)
10: The number of molecules is 5. But you get the number of atoms if you multiply 5 by 3. So 15 atoms of oxygen in five molecules.
11: What do you think? We breathe it. So it's in gasseus state. Hope I spelled it correctly
12: There are 10 molecules; the number that stands before the formula.
I guess I answered them all. Don't know why, but I guess I was in this kind of mood. Hope I've been of some help, anyway...

Answer 3

That is by far the most blatant use of this site to answer school tests and do homework. You didn't even think about doing it question by question? Or at least making it *look* like you were making an enquiry because you were interested in the area??

Some of those answers would be dang obvious if you'd paid attention in class, or opened and read the first chapter of any basic chemistry text.

You don't need "some help with this", you need a patsy.

Answer 4

a million) contemporary a while ---------------------------------- JAMIE = 5 YEARS ELLIOT = X YEARS JOHN = X +13 YEARS a million 12 months in the past ----------------------- JAMIE = 4 YEARS ELLIOT = X - a million YEARS JOHN = X+ 12 YEARS X+12 = 2 ( 4 + X-a million) = 6 + 2X X = 6 answer ELLIOT = 6 JOHN = 19 YEARS 2) A = a hundred and twenty/4 = each and every 30 SECONDS B = 60/3 = each and every 20 SECONDS LCM = 60 answer each and every 60 SECONDS 3) TAYLOR HAS X STAMPS GAVE X/2 TO JESSIE JESSIE GAVE X/4 TO KATE KATE GAVE X/ sixteen TO TIFFANY SO KATE HAS X/ 4 - X/sixteen = 3X/sixteen = 12 3X = sixteen*12 X = sixteen*4 = sixty 4 answer TAYLOR = sixty 4 STAMPS

Answer 5

i understand you need help, but tring to get someone to do your homework for you is another, sorry can't help you. well, i'll just help you with one ? #3 is 2 hydrogen atoms.

Answer 6

11
21
32
44
51
61
71
82
93
104(option 4th value 5)
113
122 (10 molecules)

Corresponding to questions qww have the option number & not the values.... please choose the mentioned option number...

Answer 7

Hey this is your Homework. Do it yourself