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olga2289 [7]
3 years ago
9

This electron cloud model of aluminum has _______ energy levels with _______ electrons on its outer energy level. A) 1, 2 B) 2,

3 C) 3, 3 D) 4, 8

Chemistry
1 answer:
Talja [164]3 years ago
7 0

Answer:

C

Explanation:

Have anice day

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C. Graphite is used as lubricant.​
Vedmedyk [2.9K]

Answer:

is this the question?please

7 0
3 years ago
Which of these best describe a flight that is approaching the speed of sound
frozen [14]

Answer:

more drag is created because the air molecules are not moving out of the way of the airplane      

Explanation:

7 0
2 years ago
Thomas had a volume of 8.5 g of sodium chloride. What is the molar mass.?
alina1380 [7]

Answer:

58.44 g/mol

Explanation:

In this problem, make sure to remember that volume is measured in mL, L or any other units of volume. Remember that g represents grams, and grams is a measure of mass.

However, independent of what mass or what volume we take, molar mass is known to be an intensive property. That is, molar mass doesn't depend on any external conditions or any measurements.

Molar mass solely depends on the chemical structure of a compound and is a constant number at any given conditions.

In this problem, we are given sodium chloride, NaCl. In order to find its molar mass, we need to refer to the periodic table, find the atomic masses of Na and Cl and then add them up to have the molar mass of NaCl:

M_{NaCl} = M_{Na} + M_{Cl} = 22.99 g/mol + 35.453 g/mol = 58.44 g/mol

5 0
3 years ago
Calculate the ΔHrxn for the following
Vesnalui [34]

Answer:

2 NO (g) → N2 (g) + O2 (g)

2 NOCl (g) → 2 NO (g) + Cl2 (g)

____________________________

2NOCl (g) ⟶ N2 (g) + O2 (g) + Cl2 (g)

ΔH = [90.3 kJ x 2 x -1] +  [-38.6 kJ x -1 x 2] = -103.4 kJ

The ΔH for the reaction is -103.4 kJ

6 0
3 years ago
if an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 mm in front of the len
Natasha2012 [34]
I think the answer is 7mm but I'm not sure.

Have a great day!
5 0
3 years ago
Read 2 more answers
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