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Gala2k [10]
3 years ago
8

Why is cold air cold?

Chemistry
1 answer:
Sholpan [36]3 years ago
4 0

Explanation:

Energy makes molecules in the air move faster and expand, decreasing density. The opposite is true for cold air. Molecules are closer together, and absorb less energy.

You might be interested in
__________ bonds form between the oxygen and hydrogen within water molecules, whereas __________ bonds form between different wa
Gemiola [76]

Answer:

A. Covalent bond

B. Hydrogen bond

Explanation:

4 0
3 years ago
Write three complete and balanced pairs of below mention electrochemical half reactions. For each pair of reactions, identify wh
kirza4 [7]

Answer: a) Cu\rightarrow Cu^{2+}+2e^-  : anode

b. 2H^++2e^-\rightarrow H_2 : cathode

c. O^{2-}\rightarrow \frac{1}{2}O_2+2e^-:  anode

Explanation:

Electrochemical cell is a device which converts chemical energy into electrical energy. It consist of two electrodes, anode and cathode.

Oxidation i.e. loss of electrons , which results in an increase in oxidation number occurs over anode.

Reduction i.e. gain of electrons, which results in decrease in oxidation number occurs over cathode.

a. Cu\rightarrow Cu^{2+}+2e^-  : oxidation :  anode

b. 2H^++2e^-\rightarrow H_2 : reduction : cathode

c. O^{2-}\rightarrow \frac{1}{2}O_2+2e^-: oxidation : anode

6 0
3 years ago
What is the molarity of a solution in which 25.3 grams of potassium bromide is dissolved in 150. mL of solution?
irga5000 [103]

Answer:

~1.417M

Explanation:

Molarity=(number of moles of solute)/(litres of solution)

In this case, we need to find moles of potassium bromide.

Mass=25.3g

Molar mass= 119g/mol

moles=(mass/molar mass)

        =(25.3)/(119)

        =0.2126moles of potassium bromide

Molarity=(0.2126)/(150/1000)

       ~1.417M

Hope this helps:)

6 0
3 years ago
Read 2 more answers
As4S6+O2->As4O6+SO2 blanced equation
goldfiish [28.3K]
You can use the app chemical balanced it will save your life
5 0
3 years ago
Below are 5 sets of potential solutes for you to compare. Both members of each pair are very soluble in water. If you had equal
Gelneren [198K]

Answer:

Option D. AlCl₃, MgC₂

Explanation:

We need to dissociate all the salts, to determine the i. (Van't Hoff factor).

The salt who has the highest value, will be the better conductor of electricity

CsCl  → Cs⁺  +  Cl⁻   i = 2

CaCl → Ca²⁺ +  Cl⁻   i = 2

CaS → Ca²⁺ +  S⁻²    i = 2

Li₂S → 2Li⁺  +  S⁻²    i = 3

KBr →  K⁺  +  Br⁻       i = 2

AlCl₃ →  Al³⁺ + 3Cl⁻   i = 4

MgC₂  →  Mg²⁺  +  2C⁻   i = 3

KI  →  K⁺  +  I⁻     i = 2

K₂S  →  2K⁺  + S⁻²   i = 3

The biggest i, is in pair D.

6 0
3 years ago
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