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jeyben [28]
3 years ago
7

The element that has a valence configuration of 5s25p6 is ________.

Chemistry
1 answer:
Ivanshal [37]3 years ago
3 0
Its period 5 from 5s25p6, with Xenon(54) as the noble gas.  2+6 = 8 electrons

54+8 = 62, or Sm.
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Question 15 need this answered asap (chemistry)
Tcecarenko [31]

Answer:

80.7 L

Explanation:

PV = nRT

P = 1520 mmHg = 2 atm

n = 5 mol

R = 0.08206 (L * atm)/(mol * K)

T = 393.15 K

2 (V) = 5 (0.08206) (393.15)

V ≈ 80.7 L

8 0
3 years ago
Using the fact that at 0.10 M, the absorbance was 0.357; and at 0.20 M, the absorbance was 0.714, the absorptivity (slope) is
olga_2 [115]

Answer:

The answer is "3.57 and 0.07".

Explanation:

Using the slop formula:

=\frac{n_2-n_1}{n_2-n_1}\\\\ =\frac{0.714-0.357}{0.20-0.10} \\\\ = ABSORPTIVITY, \ \ a=3.57 \\\\A= a\times b \times c

Given:

A=0.250

length path b=1  

from calibration it is found that

a=3.57\\\\consentation \ c=\frac{A}{a\times b} \\\\C=\frac{0.250}{3.57\times 1}

   =0.07 \ M

3 0
3 years ago
A dehydration reaction (or condensation reaction) is the process in which _____.
Alja [10]
A. The bonds between the individual monomers of a polymer are broken by the addition of water molecules.
6 0
3 years ago
Explain why the place of aluminum in the reactivity wagon seems to be unsuitable.
Step2247 [10]

Answer:

Acids react with most metals.

When an acid reacts with a metal, the products are a salt and hydrogen.

This is the general word equation for the reaction: metal + acid → salt + hydrogen

Explanation:

5 0
2 years ago
Student perfotms a Benedict's test on an unknown substance. He adds reagent(the chemical required to make a color change), and n
elixir [45]

Answer:

Reducing sugars are absent

Explanation:

Benedict's solution is an substance used in testing sugars. It is mixture of sodium carbonate, sodium citrate and copper(II) sulfate pentahydrate. It can be used instead of Fehling's solution in testing for the presence of reducing sugars.

Reducing sugars contain the -CHO group. If there is no colour change after the addition of Benedict's solution, then we can conclude that reducing sugars are absent.

7 0
3 years ago
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