CHEMISTRY HIGH SCHOOL

The solubility of Silver Bromide is 13.5x10-5 g/L. What is the Ksp?

Answers

Answer 1
Answer: first converts g/L in M :

Molar mass Silver Bromide ( AgBr) = 187.77 g/mol

M = C / molar mass

M = 13.5 x 10⁻⁵ / 187.77

= 7.189 x 10⁻⁷ M

AgBr ----- > Ag⁺    + Br ⁻

Ksp = [ Ag⁺] [ Br ⁻] = x₂

x =  7.189 x 10⁻⁷ * 7.189 x 10⁻⁷

Ksp = 5.16 x 10⁻¹³ M

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Chemical reactions can be detected by changes in

Answers

Chemical reactions can be detected by some of these changes:
1. change of color
2. formation of a solid
3. formation of gas
4. exchange of heat with surroundings 

A reaction that releases energy is called endothermic .


True or False

Answers

Answer: False

Explanation: Endothermic means it absorbs heat energy.

A mixture of uneven distribution and easy separation is called. homogeneous a solution heterogeneous a standard

Answers

The solutes dissolves in solvent results in the formation of a solution.

Those mixtures in which the components of mixture are uniformly distributed throughout the mixture are said to be homogeneous.  

Those mixtures in which the components of mixture are not uniformly distributed throughout the mixture are said to be heterogeneous.  

Those solutions whose concentrations are accurately known are known as standard.

Hence, a mixture of uneven distribution and easy separation is heterogeneous.

Answer:

A heterogenous separation!

Explanation:

If a sample of gas in a rigid container has a temperature of 28.1°C at pressure of 121.2kPa.What will the pressure increase to if heated to a temperature of 89.3°C?

Answers

Answer:

3,495.02‬

Explanation: TRY THAT FOR AN ANSWER

K20Molar Mass (g/mole)
2(39.10) + 16.00 = 94.20 g/mole
Moles
5.85 moles
Mass (grams)
Particles

Answers

Answer:

yes

Explanation:

that is the answer

Calculate the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck’s constant is 6.626 x 10-34 joule seconds, the speed of light is 2.998 x 108 m/s)

Answers

Answer:

The atom's energy will decrease by 8.99 x 10⁻²⁶ J.

Explanation:

The atom's energy will go down by an amount equal to the energy of the photon that it emits.

The energy E of a photon is inversely proportional to its wavelength according to the following equation, where h is Planck's constant and c is the speed of light:

E = (hc)/λ

We substitute the values into the equation to solve for the energy:

E = (hc)/λ = (6.626 x 10⁻³⁴ J·s)(2.998 x 10⁸ m·s⁻¹) / 2.21 m

E = 8.99 x 10 ⁻²⁶ J

Thus, the atom's energy will decrease by 8.99 x 10⁻²⁶ J.
  Energy of photon = h x f 
f = v/wavelength 
f = 3x10^8 / 2.21 = 1.357x10^8 
E = 8.99x10^-26 joules i hope i helped u
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