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Nata [24]
3 years ago
10

Which class of elements include all of the elements that are gases at room temperature

Chemistry
1 answer:
Verizon [17]3 years ago
6 0

The nonmetals are divided into two categories: reactive nonmetals and noble gases. Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). hope this helps

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The gradient of a stream depends on its
solong [7]
The gradient of a stream ( or commonly knwon as path of the stream) depend on its :
- Slope of the land,
- Geologic Structures , as in  its fractures and faults
- rock hardess
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4 0
3 years ago
a bright violet line occurs at 435.8 nm in the emission spectrum of mercury vapor. What amount of energy, in joules, must be rel
Readme [11.4K]
<h3>Answer:</h3>

4.56 × 10^-19 Joules

<h3>Explanation:</h3>

We are given;

  • Wavelength of the wave as 435.8 nm

We are required to calculate the amount of energy released by an electron.

  • We know that the speed of the wave, c is 2.998 × 10^8 m/s
  • But, c = f × λ , where f is the frequency and λ is the wavelength
  • Energy of a wave is given by the formula;

E = hf , where h is the plank's constant, 6.626 × 10^-34 J-s

But, f = c/λ

Therefore;

f = (2.998 × 10^8 m/s) ÷ (4.358 × 10^-7 m)

  = 6.879 × 10^14 Hz

Thus;

Energy = 6.626 × 10^-34 J-s ×6.879 × 10^14 Hz

            = 4.558 × 10^-19 Joules

            =  4.56 × 10^-19 Joules

Therefore, the energy that must be released by the electron is 4.56 × 10^-19 Joules

7 0
3 years ago
Unit 1- Unit Assessment (Matter &amp; Density)
konstantin123 [22]

Answer:

<h3>The answer is 11 g/mL</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question

mass = 3025 g

volume = 275 mL

We have

density =  \frac{3025}{275}  \\

We have the final answer as

<h3>11 g/mL</h3>

Hope this helps you

7 0
3 years ago
The average rate of a reaction is a good approximation of an instantaneous rate when?
Lunna [17]

The average rate of a reaction is a good approximation of an instantaneous rate when the concentration is measured during relatively brief time intervals.

At any point during such a little period, the average rate will be extremely near to the instantaneous rate. The average rate will differ from the instantaneous rates inside the period more when time intervals are longer.

The concentration change during a chosen time period is the average rate. When you take the measurements makes a difference.

The rate at a specific moment is known as the instantaneous rate. Finding the slope of the tangent to the concentration vs. time curve at that point yields the answer.

Learn more about comparison between average and instantaneous rate here brainly.com/question/17960561

#SPJ4

4 0
2 years ago
For which type of titration will the ph be basic at the equivalence point?
jeka94

A. Strong Acid vs. Strong Base

8 0
3 years ago
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