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Sphinxa [80]
2 years ago
8

Difference between isopropyl alcohol and ethyl alcohol

Chemistry
1 answer:
Tanzania [10]2 years ago
3 0

Answer:

Both alcohols are flammable, and both are used as disinfectants. There are varying grades of both in terms of purity, ethanol is more widely used in wet laboratories whereas isopropyl alcohol is preferentially used to disinfect electronic devices.

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Who was the first to state the concept of an atom?
AysviL [449]
<span>Democritus was the first</span>
4 0
3 years ago
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Describe an experiment to show that water contains hydrogen and oxygen only​
kondaur [170]

Answer:

Electrolysis

Explanation:

The electrolysis of water is one such experiment that shows that water is made up of hydrogen and oxygen atoms only in the ratio of 2 to 1.

In the electrolysis of water, electricity is passed through acidified water to cause it to decompose.

The electrolysis of water is also known as the electrolysis of dilute tetraoxosulphate  (VI) acid.

At the cathode, H⁺ ions are discharged and hydrogen gas is liberated:

               2H⁺       +     2e⁻     →        H₂

At the anode, both the sulfate ion and hydroxyl ions migrate to this electrode. Only the OH⁻ is selected for preferential discharge due to its lower position in that activity series.

         4OH⁻  →   2H₂O    +    O₂     +     4e⁻

Oxygen gas is produced at the anode.

This electrolysis demonstrates the volumetric composition of water that is, 2 volumes of hydrogen at the cathode and 1 volume of oxygen at the anode.

5 0
3 years ago
Write a letter to your friend describing your feelings after you left the school
fredd [130]
Dear friend,
How are you doing? I finally switched to my new school and it's been so hard adjusting. But I know I have a new chance at making new friends and memories. Also, I can learn new things, like interacting with new people and how to keep my anxiety low. I really miss us hanging out and how much we'd laugh and get in trouble at class. But i really hope to see you soon & that it hasn't gone terribly wrong for you since i left.
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8 0
3 years ago
If there are 0.064g of theobromine in a 43g chocolate bar, how many moles of theobromine are there?
Sever21 [200]

Answer: 3.5\times 10^{-4}

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

Given mass of theobromine (C_7H_8N_4O_2) = 0.064 g

Molar mass of theobromine (C_7H_8N_4O_2)=12\times 7+1\times 8+14\times 4+16\times 2=180 g

\text{Number of moles}=\frac{0.064g}{180g/mol}=3.5\times 10^{-4}moles

5 0
3 years ago
Read 2 more answers
How many atoms are there in 10.0 g of sodium?
Alex73 [517]
Use the grams to moles first. The molar mass of sodium is 22.99g, so 10/22.99 ≈ 0.43 moles. The use moles to atoms conversions. 0.43 x (6.022 x 10^23), which would be about 2.62 x 10^23 atoms in 10g of sodium.
8 0
4 years ago
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