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3 years ago

What evidence do we have that energy levels in an atom are quantized? State and explain the evidence.

Chemistry

1 answer:

liberstina [14]3 years ago

8 0

Answer:

The first evidence of quantization in atoms was the observation of spectral lines in light from the sun in the early 1800s by Joseph von Fraunhofer and William Hyde Wollaston.

Explanation:

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What is the atomic number (Z) of an atom containing 30 neutrons and having A= 70?

Romashka-Z-Leto [24]

A= mass number = number of protons and neutrons in the nucleus

Z= number of electrons = number of protons
Given, number of neutrons= 30

Z = A - 30 = 70 - 30 = 40

Z = 40

I hope I was helpful

7 0

3 years ago

Read 2 more answers

NaOH+HCl->............

Oxana [17]

Answer:

NaCl+H20

Explanation:

It is a neutralisation reaction in which NaOH is a base and HCl is an acid. On reaction it forms salt and water.

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3 0

3 years ago

Read 2 more answers

Match the prefix used in naming binary molecule compounds with its corresponding number

VARVARA [1.3K]

Nona= 9, hepta= 7, hexa= 6, tetra= 4

8 0

3 years ago

O The Arrhenius Model of acids and bases applies toward substances that are nonaqueous.O The Arrhenius Model of acids and bases

Alex

ANSWER

Option A

EXPLANATION

Arrhenius defines an acid as a substance that will produce hydrogen ions as the only positive ion when dissolved in water.

He also defines a base as a substance that contains a hydroxide ion (OH^-).

Hence, the Arrhenius Model of acids and bases applies that is applied to the aqueous solution.

The correct answer is option A

4 0

1 year ago

A thermometer with a percent error of 6.5% reads the room temperature as 68°F. what is the actual temperature in the room ?

Lynna [10]

Answer:

Actual temperature for the given temperature with thermometer with error of 6.5% is 63.8 degrees.

Explanation:

The percentage error in thermometer is 6.5% this means that if the temperature is 100 degrees the thermometer shell show 106.5 degrees. now calculating the actual temperature of the thermometer when the given temperature is 68°

Applying unitary method for solution 106.5

Then 100 will be $\frac {68}{106.5} \times 100$

= $0.6384 \times 100$

= 63.8 Degrees

On solving the value of this equation will give the actual temperature as 63.8 Degrees .

5 0

3 years ago