Please answer these questions

2 answers:

7 0

I found number one
Atoms are not drawn to scale. Molecules of compounds have atoms of two or more different elements. For example, water (H2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom. Methane (CH4), a common greenhouse gas, has five atoms, one of carbon (C) and four of hydrogen (H, see Fig.

VMariaS [17]3 years ago

3 0

Explanation:

1) Is imposible to determine an element from a simple drawing, more information is need or a higher level of details. Also, a "red blob of atoms" sounds like the description of a molecule (a union of two or more atoms) that may or may not be formed by only one element.

2) There are 92 natural elements, the other ones are synthetic and/or radioactive. You can identify them in the periodic table because their molecular weights are between ( ).

3) False, a molecule is a particular arrangement of atoms that can be from one or more elements. An element is a particular arrangement of atomic particles (neutrons, protons and electrons.)

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What is the percent mass oxygen in calcium carbonate (CaCo3)?

Gnoma [55]

<span>Step 1 is to determine the mass of each part
Mass of Ca is 40.08 g
Mass of C is 12.01 g
Mass of O is 16.00 x 3 = 48.00 g
Step 2 is to determine the total mass of the compound
Total mass of CaCO3 is 40.08 + 12.01 + 48.00 = 100.09 g

Step 3 is to determine the % of each part using the following formula:
Mass of part / total mass x 100 =

40.08 / 100.09 x 100 = 40.04 % Ca

12.01 / 100.09 x 100 = 12.00 % C

48.00 / 100.09 x 100 = 47.96 % O

Step 4 is to double check by adding all percentages. If they equal 100, then I probably did it right. :)
40.04
+12.00
+47.96
=100.00</span><span>
</span>

4 0

3 years ago

Read 2 more answers

How many neutrons and protons does a neutral atom of sodium with an atomic mass number of 23 have? A. 22 neutrons; 11 protons B.

atroni [7]

In order to find out how many protons a sodium atom has, you have to look at the periodic table. Sodium is Na on the periodic table and you look for the number on the top of the symbol and you can see that it has 11 protons. To find out how many neutrons, you have to subtract 11 from the mass number, which is 23. 23-11 = 12.

12 neutrons; 11 protons

3 0

4 years ago

What is the name of the event ,which created the universe ?

DanielleElmas [232]

The event that is known to have 'created' the universe was the Big Bang THEORY (because it can't be proven and most people just don't want to admit that there is a God)

5 0

4 years ago

Which of the following molecules has correctly labeled bond dipoles?

olga_2 [115]

Answer: The molecule identified with the letter C. HFO.

Explanation:

1) In covalent bonds, the dipoles are identified with an arrow pointing from the least electronegative element toward the most electronegative element.

2) The molecule HFO is formed by one covalent bond between H and O, and other covalent bond between F and O.

3) O is more electronegative than H, so in the H-O bond the dipole is identified with the arrow from the H atom toward the O atom. That is correctly indicated in the drawing C, in this way:

-|----→

H - O

4) F is more electronegative than O, so in the O-F bond the dipole is identified with an arrow from the O atom toward the F atom. That is correctly indicated in this way:

-|---→

O - F.

4 0

3 years ago

Two sets that contain the same number of elements are called _______.

8090 [49]

They are called equivalent sets

4 0

3 years ago