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AfilCa [17]
4 years ago
10

When ammonium chloride dissolves in water, the solution becomes colder. (a) is the solution process exothermic or endothermic? (

b) why does the solution form?
Chemistry
1 answer:
LuckyWell [14K]4 years ago
6 0
The  solution  process  is  exothermic  because  when solution  become  colder  heat  energy  is  released which  make  the process  exothermic.  The  exothermic  process  is  the  process  in  which  heat  is  released.The  solution  forms  inorder  to  separate  NH4+  ions  and  Cl-  ions
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Which is a characteristic of mixtures ?
sattari [20]

The characteristics of mixtures are:

a) they are made up of two of more substances

b) the two substances can be separated by physical means

c) there are two kinds of mixtures : homogenous and heterogenous

d) homogenous mixtures do not have any physicaly distinguished boundary  

6 0
4 years ago
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Which of the following operations usually makes a substance dissolve faster in a solvent?
vovangra [49]

Answer:

B and C

Explanation:

powder dissolve faster than particles

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6 0
3 years ago
How does the uneven hearing of earth cause convection currents to form?<br> PLEASE ANSWER:)
igor_vitrenko [27]

Answer:

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3 0
3 years ago
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Draw the best lewis structure for h 2 ​ co 3 ​ and calculate the formal charge on carbon.
schepotkina [342]
The Lewis structure of Carbonic Acid (H₂CO₃) is given below. In structure it is shown that carbon has a double bond with one oxygen atom and two single bonds with hydroxyl groups.

Formal Charge;
                        Formal charge is caculated as,

Formal charge  =  # of valence e⁻ - [# of lone pair of e⁻ + 1/2 # of bonded e⁻]

Formal charge on Carbon;

Formal charge  =  4 - [ 0 + 8/2]

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7 0
3 years ago
How many mL of a stock 50% (w/v) KNO3 solution are needed to prepare 250 mL of a 20% (w/v) KNO3 solution?
Andre45 [30]

Answer:

100ml of a stock 50% KNO3 solutions are needed to prepare 250ml of a 20% KNO3 solution.

Explanation:

In the given question it is mentioned that

     S1=50%

      V2=250ml

      S2= 20%

We all know that

                     V1S1=V2S2

                     ∴V1=  V2×S2÷S1

                     ∴V1=  V2S2×1/S1

                      ∴V1= 250×20÷50

                       ∴V1= 100ml

 

6 0
4 years ago
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