Answer: argon (Ar)
Ar, Z=18 => 1s2 2s2 2p6 3s2 3p6
The 3 level shell has 8 electrons. The element with one more electron, need to start a new shell to arrange for the last electron.
Argon is a noble gas. Its group in the periodic table is 18. All the noble gases have the last shell full, which conferes them a high stability and low reactivity.
The answer is D. Milk turning sour
<span>A. breaking glass
B. chopping wood
C. crushing a can
D. milk turning sour
</span>
Have a nice day! :)
Answer:
165 g of NaCl are formed in the reaction
Explanation:
2Na + Cl₂ → NaCl
In order to determine the limiting reactant, we convert the mass of each reactant to moles
35 g / 23g/mol = 1.52 moles Na
100 g / 70.9 g/mol = 1.41 moles Cl₂
1 mol of chlorine reacts with 2 moles of Na, so If I have an x value of moles of Cl₂ I would need the double to react.
For 1.41 moles of Cl₂, I need 2.82 moles of Na; therefore my limiting reagent is the Na. Ratio is 2:2. So if I have 2.82 moles of Na I will produce 2.82 moles of NaCl
We convert the moles to mass: 2.82 mol . 58.45 g/1 mol =164.8 g
Answer:
Explanation:
In the figure attached, I have numbered the carbon atoms to permit to count them easily.
<u>1. Carbon atoms</u>
Each vertex without a letter represents a carbon atom:
- Count them: 17 (they are numbered on the figure attached)
<u>2. Hydrogen atoms</u>
For each carbon subract 1 for each bond and subtract 1 for each group attached to it:
- Carbon 1: 4 - 2 = 2
- Carbon 2: 4 - 2 = 2
- Carbon 3: 4 - 2 = 2
- Carbon 4: 4 - 2 = 2
- Carbon 5: 4 - 4 = 0
- Carbon 6: 4 - 4 = 0
- Carbon 7: 4 - 3 = 1
- Carbon 8: 4 - 4 = 0
- Carbon 9: 4 - 4 = 0
- Carbon 10: 4 - 3 = 1
- Carbon 11: 4 - 4 = 0
- Carbon 12: 4 - 4 = 0
- Carbon 13: 4 - 3 = 1
- Carbon 14: 4 - 3 = 1
- Carbon 15: 4 - 2 = 2
- Carbon 16: 4 - 2 = 2
- Carbon 17: 4 - 4 = 0
Total H atoms attached to C atoms:
- 2 + 2 + 2 + 2 + 1 + 1 + 1 + 1 + 2 + 2 = 16
Total H atoms in all: 16 + 2 = 18
<u>3. Fluorine atoms</u>
Count them:
<u>4. Nitrogen atoms</u>
Count them:
<u />
<u>5. Oxygen atoms</u>
Count them:
<u>6. </u><em><u>Molecular formula</u></em>
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Summary:
<em>Molecular formula:</em>
<h3>What is the oxidation number of oxygen in H2O?</h3>
Oxygen almost always has an oxidation number of -2, except in peroxides (H 2 O 2) where it is -1 and in compounds with fluorine (OF 2) where it is +2. Hydrogen has an oxidation number of +1 when combined with non-metals, but it has an oxidation number of -1 when combined with metals.
<h3><em>Sure hoep this helps you :)</em></h3>