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JulsSmile [24]
3 years ago
14

Write down five laboratory safety rules.

Chemistry
1 answer:
OLEGan [10]3 years ago
5 0

Answer:

Five Laboratory Safety Rules:

1). Do not eat in the laboratory.

2). Do not touch any chemical or reagent unless you are told to do so.

3). Neither play in lab, nor sit on the table.

4). Don't remove labels on any reagent.

5). Don't taste anything in the laboratory, no matter how familiar it appears.

Hope it helps.

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Answer:

Explanation:

NaCl does not contain molecules

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A rock weighing 32.0 g is placed in in a graduated cylinder displacing the volume from 22.3 mL to 27.6 mL. What is the density o
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27.6 - 22.3 = 5.3; you simply subtract the old density from the new density.
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Quis critérios foram usadps por dobereiner em sua tentava de organiza os elementos químicos?
anyanavicka [17]

Döbereiner grouped the known elements into <em>triads</em> (sets of three) so that

• The <em>atomic mass of the middle element</em> was approximately the average    of the other two

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• The <em>physical properties of the middle element</em> were between those of the other two

One example of a triad is Li – Na – K.

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(b) Li reacts slowly with water. Na reacts rapidly. Potassium reacts violently.

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8 0
3 years ago
A balloon occupies 1.50 L with 0.205 mol of carbon dioxide. How many moles would be required to increase the size of the balloon
Gekata [30.6K]

Answer:

0.683 moles of the gas are required

Explanation:

Avogadro's law relates the moles of a gas with its volume. The volume of a gas is directely proportional to its moles when temperature and pressure of the gas remains constant. The law is:

V₁n₂ = V₂n₁

<em>Where V is volume and n are moles of 1, initial state and 2, final state of the gas.</em>

<em />

Computing the values of the problem:

1.50Ln₂ = 5L*0.205mol

n₂ = 0.683 moles of the gas are required

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How many pi bonds are present in a molecule of HCP?
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2

Explanation:

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