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Rainbow [258]
3 years ago
11

20 points! So I got this lab report to do and I need some more info it's about lab safety got any info I can use! :) If so, Than

k you!
Chemistry
1 answer:
FromTheMoon [43]3 years ago
8 0
Don’t eat or drink in labs

Dress for the lab; don’t wear open toed shoes

Dispose of lab waste properly

No horse play

Don’t taste or sniff things in the lab

Tire your hair back
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What is the correct formula for Heptarsenic Tetrabromide
harina [27]
Hepta is seven and tetra is four, so option c is your answer
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4 years ago
Determination of Vitamin C Concentration by Redox Titration Pre-laboratory Questions 1. A solution is prepared by dissolving 2.0
Ierofanga [76]

Answer:

M = 0.011

Half reactions for reduction and oxidation:

oxidation:

HC12H6Cl2O2N + NH+ +2e- = HC12H8Cl2O2N

reduction:

C6H8O6 = C6H6O6 + 2H+ + 2e-

Explanation:

Molarity of the ascorbic acid solution:

Ascorbic acid molar mass = 173.12 g/mol

Then you have to find the mols:

mol = 2g/176,12 =0.011 mol Ascorbic acid.

Use the molarity equation:

Molarity (M) = 0.011 mol / 1 L = 0.011 M

Reactions for the reduction of DCPIP by ascorbic acid:

These reactions have to be balanced by the oxide reduction method.

Because it involves the transfer of electrons from ascorbic acid to the DCPIP.

Remember: when is happens a reduction, also happens oxidation.

To see the reactions watch the images attached.

The first one has the calculus for the molarity of the ascorbic acid solution.

The second one has the reactions for the reduction and oxidation of the compounds.

3 0
4 years ago
Why doesnt the number of neutrons identify an element
Goryan [66]

You look at the atomic mass.. The number of neutrons is different for different individual atoms of the same element, each atom is also known an isotope. Looking at a periodic table, the atomic mass listed is the average atomic mass for all isotopes of that element found in nature.

8 0
4 years ago
About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes,
Stolb23 [73]

Answer:

Two-third of the toxic metal, mercury comes from gold mining.

Explanation:

During gold mining small pieces of gold which are within  the soil are separated with the help of mercury. Both gold and mercury are mixed and they forms amalgam. Further gold can be extracted by vaporizing the mercury, thus releasing it into air and contributing to two-third of the air pollution by human activities.

Therefore (d) gold mining is the correct answer.

7 0
3 years ago
22 g de um gás estão contidos em um recipiente de volume igual a 17,5 L, a uma temperatura de 77ºC e
Aleksandr-060686 [28]

Answer:

Option D.

Explanation:

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P . V = n . R . T

First of all we convert the temperature value from °C to K

77°C + 273 = 350K

and the pressure from mmHg to atm

623 mmHg .  1 atm/760 mmHg = 0.82 atm

We replace data: 0.82 atm . 17.5L = n . 0.082 L.atm/mol.K . 350K

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These are the moles that corresponds to 22 g of the gas, so the molar mass will be → 22g / 0.50 mol =  44 g/mol

That molar mass corresponds to CO₂  →  12 g (C) + 16 g (O) . 2 = 44 g/mol

4 0
3 years ago
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