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nikitadnepr [17]
3 years ago
7

I really need help. Could you pls give me the answers to the questions.

Chemistry
1 answer:
marissa [1.9K]3 years ago
3 0

Answer:

4.Electronic configuration

Explanation:

The number of digits in the electronic configuration tells you how many shells are in an atom.

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What would the concentration be of a solution made
Anastasy [175]

Answer:

3 M

Explanation:

Given data

  • Moles of sodium hydroxide (solute): 5 moles
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We can calculate the molar concentration, or molarity (M), of the solution using the following expression.

M = moles of solute / volume of solution (in liters)

M = 5 moles / 2 L

M = 2.5 M ≈ 3 M (if we round off to 1 significant figure)

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Do all metal produce electromagnetic radiation when they are heated in a flame
Ilia_Sergeevich [38]

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Yes , all metals when placed in the heat produces EM radiations

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3 years ago
How many ethyne molecules are contained in 84.3 grams of ethyne (C2H2)?
ololo11 [35]
(~26grams/mole) and Avogadros # (6.022x10^23) 84.3grams x 1mole/26grams x 6.022x10^23 molecules/mole = 1.95x10^24 molecules of C2H2
6 0
3 years ago
Read 2 more answers
Why aren't alkali metals found in pure form?
Llana [10]
It mostly because they're so reactive and if they were in their pure form and touched water they would have a very violent reaction. They also want to be more stable so they look for more electrons and quickly bond.
6 0
3 years ago
How many moles of pbr3 contain 3.68 × 1025 bromine atoms?
Tcecarenko [31]
The number  of Pbr3  that   contain   3.68  x10^ 25  bromine  atoms is  60.631  moles


      calculation

by  use of Avogadro  law constant 
that is,   1  moles =  6.02  x10^23   atoms

what   about  3.65  x10^25  atoms

by   cross  multiplication

= (1 mole  x 3.65 x  10 ^25  atoms)  /  ( 6.02  x10^23  atoms)  = 60.631  moles
atoms and  atoms  cancel  out  each  other
6 0
3 years ago
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