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IRISSAK [1]
4 years ago
13

Question 12 (1 point)

Chemistry
2 answers:
Vinvika [58]4 years ago
8 0

Answer:

Option c. Neutral

Explanation:

Only neutral solution gives a green colouration to a pH paper

marishachu [46]4 years ago
5 0
Neutral
There was no change on the red or blue litmus and the ph paper turned green because it had a pH of 7
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If our eyes could see a slightly wider region of the electromagnetic spectrum, we would see a fifth line in the Balmer series em
erica [24]

Answer: Wavelength  associated with the fifth line is 397 nm

Explanation:

E=\frac{hc}{\lambda}

\lambda = Wavelength of radiation

E= energy

For fifth line in the H atom spectrum in the balmer series will be from n= 2 to n=7.

Using Rydberg's Equation:

\frac{1}{\lambda}=R_H\left(\frac{1}{n_i^2}-\frac{1}{n_f^2} \right )\times Z^2

Where,

\lambda = Wavelength of radiation

R_H = Rydberg's Constant =10973731.6m^{-1}

n_f = Higher energy level = 7

n_i= Lower energy level = 2 (Balmer series)

Putting the values, in above equation, we get

\frac{1}{\lambda}=10973731.6\times \left(\frac{1}{2^2}-\frac{1}{7^2} \right )\times 1^2

\frac{1}{\lambda}=2.52\times 10^{6}m

\lambda}=3.97\times 10^{-7}m=397 nm      1nm=10^{-9}m

Thus wavelength λ associated with the fifth line is 397 nm

7 0
4 years ago
Escribe aquí algo que consideres que requiere un balance para que se lleve a cabo correctamente​
Solnce55 [7]

Answer:

Algo importante sobre el balance de una reacción química es la ley de la conservación de la masa que establece que la masa no se crea ni se destruye sólo se transforma de modo que en una reacción química la suma de la masa de los reactivos debe ser igual a la suma de la masa de los productos.

Por ejemplo: La fermentación de la glucosa es una reacción química balanceada que da como resultado etanol y dióxido de carbono.

C₆H₁₂O₆ → 2C₂H₆O +2CO₂

Calculando la masa de los reactivos y productos, se debe cumplir la ley de la conservación de la masa:

C₆H₁₂O₆= 6*12+12*1+6*16=180 g/mol

C₂H₆O= 2*12+6*1+16=46 g/mol

CO₂=12+2*16=44 g/mol

C₆H₁₂O₆ → 2C₂H₆O + 2CO₂

180 g/mol = 2*46 g/mol + 2*44 g/mol

180 g/mol = 92 g/mol + 88 g/mol

180 g/mol = 180 g/mol

8 0
3 years ago
A: -3.45<br> B: 17.45 <br> C: 10.55<br> D: 3.55
Minchanka [31]

Answer:

i think its b

Explanation:

6 0
4 years ago
What are the cations and anions whose compounds are usually soluble?
HACTEHA [7]

Answer: -

Solubility of a substance depend on the balance of intermolecular forces between the solvent and solute, and the entropy change that accompanies this process.

Temperature and pressure also plays a role in solubility.

A solution having Group 1 cations like lithium, sodium, potassium etc are always soluble.

A solution having NH₄⁺ is soluble.

All salts with anion as nitrates, acetates, chlorates, and perchlorates are soluble in water.

8 0
3 years ago
An adiabatic throttling valve expands an ideal gas. The internal energy of the ideal gas?
just olya [345]

The internal energy of the ideal gas is zero

The change in internal energy  for an isothermal process is zero.

An ideal gas has no interactions between particles, therefore no intermolecular forces.

pressure change at constant temperature does not change the internal energy.

Adiabatic throttling expansion has less work done and lower heat flow.

That lower the internal energy.

The temperature decreases during the adiabatic expansion

Hence the internal energy of the ideal gas is zero

Learn more about the ideal gas on

brainly.com/question/17136449

#SPJ4

3 0
2 years ago
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