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valkas [14]
2 years ago
6

Chemistry practice ​

Chemistry
1 answer:
LekaFEV [45]2 years ago
8 0
C2P4 (2 carbons and 4 phosphorus)
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Has colored salts that will produce colored aqueous solutions
Katarina [22]
The answer is (b.) Li.

4 0
3 years ago
what is the oxidation number for chromium in each of these compounds. show your work. A. K2CrO4 B.Cr2O3
Dmitry [639]

Answer:

A. + 6.

B. + 3.

Explanation:

<em>A. K₂CrO₄:</em>

  • To calculate the oxidation no. of an element in a compound:

<em>We have that the sum of the oxidation no. of different elements in the compound multiplied by its no. is equal to the overall charge of the compound.</em>

∵ 2(oxidation no. of K) + (oxidation no. of Cr) + 4(oxidation no. of O) = 0.

oxidation no. of K = + 1, oxidation no. of O = - 2.

∴ 2(+ 1) + (oxidation no. of Cr) +4(- 2) = 0.

∴ 2 + (oxidation no. of Cr) - 8 = 0.

∴ (oxidation no. of Cr) - 6 = 0.

<em>∴ oxidation no. of Cr = + 6.</em>

<em></em>

<em>B. Cr₂O₃:</em>

∵ 2(oxidation no. of Cr) + 3(oxidation no. of O) = 0.

oxidation no. of O = - 2.

∴ 2(oxidation no. of Cr) + 3(- 2) = 0.

∴ 2(oxidation no. of Cr) - 6 = 0.

∴ 2(oxidation no. of Cr) = + 6.

<em>∴ (oxidation no. of Cr) = + 6/2 = + 3.</em>

7 0
3 years ago
Please help me is my final 2. Which of the following is a fission reaction?
Shtirlitz [24]

Answer:

Uranium-235 absorbing a neutron and breaking into Barium-141,  Krypton-92 and three neutrons

Explanation:

A fission reaction is said to have occurred when an unstable nucleus is bombarded with a neutron such that it disintegrates into daughter nuclei and produces more neutrons in the process. Hence, Uranium-235 absorbing a neutron and breaking into Barium-141,  Krypton-92 and three neutrons is a fission reaction.

This fission reaction is often a self sustaining reaction. The neutrons produced in the reaction bombards more of the parent nucleus and the process continues indefinitely(chain reaction).

Control rods and moderators are used to keep the chain reaction in check.

5 0
2 years ago
A prokaryotic cell does not have
krok68 [10]

Answer:

D

Explanation:

3 0
3 years ago
In a college of exactly 2940 students, exactly 60 % are male. What is the number of female students?
Norma-Jean [14]

Answer:1176

Explanation:

Number of male students: 2940*(60/100)=1764

So the number of female students would be:

2940-1764=1176

5 0
3 years ago
Read 2 more answers
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