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alexandr402 [8]
3 years ago
13

Select the correct answer.

Chemistry
2 answers:
sergejj [24]3 years ago
4 0
D.) black text on a yellow background. There is much more contrast in the colors black and yellow than the other choices.
Igoryamba3 years ago
4 0
D black text on yellow background
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A rectangular corral of widths Lx = L and Ly = 2L contains seven electrons. What is the energy of (a) the first excited state, (
DiKsa [7]

Answer:

See explaination

Explanation:

The invariant mass of an electron is approximately9. 109×10−31 kilograms, or5. 489×10−4 atomic mass units. On the basis of Einstein's principle of mass–energy equivalence, this mass corresponds to a rest energy of 0.511 MeV.

Check attachment for further solution to the exercise.

3 0
3 years ago
Give the nuclear symbol for the isotope of gallium, ga, that contains 40 neutrons per atom. Replace the question marks with the
Cerrena [4.2K]

The nuclear symbol of an element have three parts namely:  

  1. the symbol of an element
  2. mass number of the element
  3. atomic number of the element

The general representation is as:

_{Z}^{A}X

where X is the chemical symbol of the element, A is mass number of the element that is total number of neutrons and protons in the nucleus of an atom, and Z is atomic number of the element that is number of protons in the atom.

Element = Gallium, Ga    (given)

Number of neutrons = 40 (given)

Let the nuclear symbol be _{?}^{?}Ga. So, we need to determine the values of "?" in the symbol.

Atomic number of Gallium, Ga = 31

Since, atomic number = Number of protons.

So, number of protons of Gallium, Ga = 31

Mass number = number of protons + number of neutrons

Substituting the values:

Mass number = 31+40 = 71

So, the nuclear symbol is _{31}^{71}Ga.

7 0
3 years ago
PLS HELP! If I have 17 moles of gas at a temperature of 67°C, and a pressure of 5.34 atmospheres, what is the volume of the gas?
sveta [45]

Answer: If I have 17 moles of gas at a temperature of 67°C, and a pressure of 5.34 atmospheres, what is the volume of the gas? write down all the givens of the problem

8 0
3 years ago
Read 2 more answers
How to do electronic configuration
In-s [12.5K]
A Bohr diagram of lithium. In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s 2 2s 2 2p 6
5 0
3 years ago
Some gas was collected when the pressure was 760mmHg. It occupied 500mL when the pressure was increased to 800mmHg. What was the
Ivan

Answer:

<h3>The answer is 526.32 mL</h3>

Explanation:

To find the original volume we use the formula for Boyle's law which is

P_1V_1 = P_2V_2

Since we are finding the original volume

V_1 =  \frac{P_2V_2}{P_1}  \\

From the question we have

V_1 =  \frac{500 \times 800}{760}  =  \frac{400000}{760}  =  \frac{40000}{76}  \\  = 526.315789...

We have the final answer as

<h3>526.32 mL</h3>

Hope this helps you

6 0
3 years ago
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