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jok3333 [9.3K]
3 years ago
8

What is required before using a respirator? A.nothing B.proper training C.survey of the work area D.users guide

Chemistry
2 answers:
OLga [1]3 years ago
8 0
I would say B but it might be D
andreyandreev [35.5K]3 years ago
8 0
B because you need to know how to actually be able to use the device
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How to change τhe color of silver mercury to red???
elena-14-01-66 [18.8K]

Answer: This is the hue of mercury if you're looking for it. Mercury reacts with sulphur to generate a crimson hue. In the past, they always used a thermometer.

Explanation:  However, due of its toxicity, individuals have switched to using alcohol in glass thermometers, which work similarly to mercury thermometers.

hope this helped best of luck mate! :) if this helped make sure to mark me Brainliest!

8 0
3 years ago
Which of the following is true about subatomic particles?
Ganezh [65]

Answer:

I think the answer is C. protons are positively charged are one of the heaviest subatomic particles.

Explanation:

Electrons are negatively charged which is the basic unit of an electric charge

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8 0
3 years ago
Read 2 more answers
Calculate the atomic mass of silicon. The three silicon isotopes have atomic mass and relative abundances of 27.9769 amu (92.229
eduard
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8 0
3 years ago
When fluorine gas combines with water vapor, the following reactions occurs.
jonny [76]
Hello!

The Chemical reaction is the following:

2F₂(g) + 2 H₂O(g) → O₂(g) + 4HF(g)

If we assume that all the gases are ideal gases, we can describe the coefficients of this reaction as Volume rather than moles, so we can apply the following equations:

2 L F_2* \frac{2 L H_2O}{2 L F_2}=2 L H_2O \\ \\ 2 L F_2* \frac{1 mol O_2}{2 L F_2}=1 mol O_2 \\ \\ 2 L F_2* \frac{4 mol HF}{2 mol F_2}= 4 mol HF

So, 2 L of Water Vapor reacts with the fluorine; and 1 L of Oxygen and 4 L of Hydrogen Fluoride are produced.

Have a nice day!

6 0
3 years ago
2. Arrange the following in order of increasing first ionization energy:<br> I, Rb, Na
NemiM [27]

Rb > I > Na

Rubidium have lowest ionisation energy due to larger size and less electronegativity!

8 0
3 years ago
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