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Bogdan [553]
3 years ago
10

??? I know it's hard to make out but please help xx15 points

Chemistry
1 answer:
baherus [9]3 years ago
7 0
Answer is C. 2, 3 and 5 shows how as the number of carbon increase,  butane, pentane and hexane (4,5 and 6 carbons) the octane number does decrease
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What happens to the surface of the moon during a total lunar eclipse, when all of Earth's sunrises and sunsets are projected ont
scoundrel [369]

Answer:

It's like the projection of sunrises and sunsets onto the lunar surface

Explanation:

6 0
3 years ago
How many moles of aluminum metal are needed to produce 3.33 moles of aluminum chloride?
Ugo [173]

There are 2 moles of aluminum metal that is needed to produce 3.33 moles of aluminum chloride

4 0
3 years ago
Why did it require two sodium atoms to complete the Na2O formula unit? Na has +2 charge and O has -1 charge. Na has +1 charge an
Artyom0805 [142]
Na₂O is an ionic compound. Na is in group 1 which means it has one electron in the outer shell. O is in group 6 so it has 6 electrons in the outer shell.
To become stable atoms need to either lose the electrons in the outer shell or gain electrons to gain a complete outer shell configuration. 
To become stable Na loses its outer electron and becomes positively charged. It only loses one electron, so net charge is +1. O to become stable gains 2 electrons to complete its outer shell and becomes negatively charged. since it gains 2 electrons, the net charge is -2. 
cation - Na⁺
anion - O²⁻
O gains 2 electrons but Na can give only one electron, therefore 2 Na⁺ ions are required. 
the compound can be written by exchanging the charges
  ions         Na⁺       O²⁻
charge       +1       -2
exchange   Na₂O
Correct answer is <span>Na has +1 charge and O has -2 charge</span>
5 0
3 years ago
Read 2 more answers
Common uses for halogen compounds
olga2289 [7]
Fluorine is used to strengthen the enamel of your teeth, it can be used in acid form to etch glass, and chlorine is used in our drinking water and swimming pools. They're all part of the halogen family
4 0
2 years ago
Highlight the basic points in Lewis and Langmuir theory of electrovalency
ankoles [38]
The correct answer for the question that is being presented above is this one: "Electrovalency is characterized with the transferring of one or more electrons from one atom to another together with the formation of ions and as well as the number of positive and negative charges. 

The Lewis and Langmuir theory of electrovalency (and as well as Kossel's) is dealing with Ionic bonds. 

Lewis: electron-pair sharing, octet rule, Lewis Symbols or StructureLangmuir: introduced term "covalent" bond, and popularized Lewis's ideas

<span>The Lewis-Langmuir electron-pair or covalent bond is referred as the homopolar bond, where the complete transfer of electrons give rise to ionic, or electrovalent bond (1) through attraction of opposite charges.</span>
8 0
3 years ago
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