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VMariaS [17]
3 years ago
15

Tell me answer........... fast ​

Chemistry
2 answers:
blondinia [14]3 years ago
7 0
The answer will be 34
Hope you get it

Mashutka [201]3 years ago
5 0

Answer:

45

Explanation:

1+4x1=5

2+5x2=12

3+6x3=21

5+8x5=45

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How does the study of cosmology relate to astronomy
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(a) The rate of the reaction in terms of the "disappearance of reactant" includes the change in the concentration of the
Vaselesa [24]

Answer:

The average rate of the reaction in terms of disappearance of A is 0.0004 M/s.

Explanation:

Average rate of the reaction is defined as ratio of change in concentration of reactant with respect to given interval of time.

R_{avg}=-\frac{[A]_2-[A]_1}{t_2-t_1}

Where :

A_1 = initial concentration of reactant at t_1.

A_2 = Final concentration of reactant at t_2.

2A+3B → 3C+2D

R_{avg}=-\frac{1}{2}\frac{[A]_2-[A]_1}{t_2-t_1}

The concentration of A at (t_1=0 seconds ) = A_1=0.0400 M

The concentration of A at (t_2=20 seconds ) = A_2=0.0240 M

The average rate of reaction in terms of the disappearance of reactant A in an interval of 0 seconds to 20 seconds is :

R_{avg}=-\frac{1}{2}\times \frac{0.0240 M-0.0400 M}{20-0}=0.0004 M/s

The average rate of the reaction in terms of disappearance of A is 0.0004 M/s.

6 0
3 years ago
Which is the correct Lewis dot structure of NH2-?
3241004551 [841]
D. The total number of valence electrons is 8 and D represents that. D also correctly uses the octet rule for N and duet rule for H.
6 0
3 years ago
Read 2 more answers
Atoms of Ca and S would be expected to react in a ratio of<br> A) 1:1<br> B) 1:2<br> C)2:1<br> D)3:1
VMariaS [17]

Answer:

Option A = 1:1

Explanation:

The atoms of calcium and sulphur when react their ration is 1:1. The charge on calcium is +2 and on sulphur is -2.

Ca⁺²S⁻²

The +2 and -2 charges are cancel out and overall charge will be zero.

CaS

so their atomic ratio will be 1:1

7 0
3 years ago
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