2 years ago

Which of the following points is/are true for plasma?

Chemistry

2 answers:

Irina-Kira [14]2 years ago

6 0

The answer is 4. This is the answer because the first 3 are all correct

Likurg_2 [28]2 years ago

5 0

Answer:

4 all of the choices. the rest of the answers are correct so it's all of the choices

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Colors are in what part of the electromagnetic spectrum?

Drupady [299]

"As we move through the visible spectrum of violet, blue, green, yellow, orange and red, the wavelengths become longer. The range of wavelengths (400 - 700 nm) of visible light is centrally located in the electromagnetic spectrum (Fig. 1)."

-https://www.asu.edu/courses/phs208/patternsbb/PiN/rdg/color/color.shtml

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3 years ago

A certain radioactive atom has 90 protons and 142 neutrons. If this atom undergoes alpha decay, what is the mass number of the d

Anastaziya [24]

Answer:

228

Explanation:

alpha decay is removing alpha particle $_2^{4}He$

2 number of protons, 4 mass number = 2 protons + 2 neutrons

We have

90 protons and 142 neutrons

<u> - 2 protons - 2 neutrons</u>

88 protons 140 neutrons

Mass number of new (daughter) atom = 88 +140 = 228

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3 years ago

Hydrogen gas and nitrogen gas can react to form ammonia according to the following equation N2 (g) + 3H2 (g) 2NH3(g)

nataly862011 [7]

Answer:

67.2 L

Explanation:

2 mol NH3 x $\frac{3 mol H2}{2 mol NH3}$ = 3 mol H2

3 mol H2 x $\frac{22.4 L}{1 mol H2}$ = 67.2 L

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3 years ago

Which of the following decomposition reactions is/are correct?

qwelly [4]

<span>A) 2NaOH -> 2Na + O2 + H2
is not correct since Na is unstable

B) 2NaOH -> 2Na + H2O + 1/2O2
is not correct since Na is unstable

C) 2NaOH -> Na2O + H2O
is correct since N2O is stable

D) 2NaOH -> 2Na + H2O2
is not correct since Na is unstable</span>

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3 years ago

Read 2 more answers

What is one thing that all measurements have?

lbvjy [14]

A number and a unit?

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3 years ago