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saveliy_v [14]
3 years ago
5

Frayer model for matter

Chemistry
1 answer:
givi [52]3 years ago
6 0
A model showing that gases are made from the matter of particles that are too small to see and are moving freely around in space can explain many observations.
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1) What is the electron configuration of the element with 27 protons?
Romashka [77]
1) cobalt u can tell bc on a periodic table there is a small number that on cobalt is 27.

2) think that would be 11 bc in the 4th shell there can  be up to 18 electrons
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3 years ago
N__________ is the study of atoms.
AlekseyPX
I think the answer might be nuclear physics
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lana [24]
I'm guessing D or C, remember that the noble gases cannot combine
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3 years ago
Calculate the molarity of a solution of Nach if it contains 7.2.g Nach in 100.0 mL of solution. andver: m Nach . .
Norma-Jean [14]

Answer:

1.23 M

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity  

V = volume of solution in liter ,

n = moles of solute ,

Moles is denoted by given mass divided by the molecular mass ,  

Hence ,  

n = w / m

n = moles ,  

w = given mass ,  

m = molecular mass .

From the question ,

w = given mass of NaCl = 7.2 g

As we know , the molecular mass of NaCl = 58.5 g/mol

Moles is calculated as -

n = w / m  =  7.2 g / 58.5 g/mol = 0.123 mol

Molarity is calculated as -

V = 100ml = 0.1 L            (since , 1 ml = 1/1000L )

M = n / V  =  0.123 mol / 0.1 L = 1.23 M

5 0
3 years ago
How do I study Chemistry efficiently?
TEA [102]
Review and Study Material Before Going to
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Seek Understanding.

Take Good Notes.

Practice Daily.

Take Advantage of Lab Time.

Use Flashcards.

Use Study Groups.

Break Large Tasks Into Smaller Ones.
5 0
3 years ago
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