<span>We know that protons gives positive charge, neutrons no charge and electrons negative, then +14 - 12 = +2 So the charge of the atom is sign positive and magnitude 2</span>

7 0

3 years ago

In water, hydrochloric acid forms positive ______ ions and negative _______ ions

kondaur [170]

Answers:

1st: H30+

2nd: CI-

3 0

3 years ago

Can someone tell me if I did right?? Or if you have any ideas on what I should put it would be helpful

Lapatulllka [165]

Answer:

it looks good to me just pay attention to the subscriped, i always have trouble with that.

Explanation:

8 0

2 years ago

The dilution factor D for an unseeded mixture of wastewater is 0.05. The DO of the mixture is initially 8.0 mg/L, and after 5 da

enyata [817]

Answer:

(i) 5-day BOD of the waste is 120 mg/l.

(ii) The ultimate carbonaceous BOD (Lo) is 20 mg/l.

Explanation:

The dilution factor D is 0.05.

The initial DO is 8.0 mg/L and the DO after 5 days is 2.0 mg/L.

The BOD of the waste for an unseeded mixture is

$BOD_5=(DO_5-DO_0)/D=(8-2)/0.05=6/0.05=120mg/l$

The ultimate carbonaceous BOD (Lo) can be calculated as

$L = L_o*10 ^{- k_1t} \\L_o=L/10^{- k_1t}=2/10^{- 0.2*5}=2/10^{- 1}=2*10=20mg/l$

6 0

3 years ago