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IgorLugansk [536]
3 years ago
14

How did Dmitri Mendeleev arrange the periodic law?

Chemistry
1 answer:
Alecsey [184]3 years ago
7 0

Answer:

a. Each set of elements was arranged in special coloumns based on their mass.

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What is the pH of the solution at the endpoint of a titration
Arada [10]

Answer:

The pH at the equivalence point is 7.0.

Explanation:

This is because the solution only contains water and a salt that is neutral.

Since neither H+ or OH-, molecules remain in the solution.

We can conclude that the equivalence point is 7.0.

5 0
3 years ago
A scientist has two samples of gas: The first sample contains one mole of argon atoms and has a mass of 39.948 g; the second sam
V125BC [204]

There are 6.022 × 10²³ atoms in 39.948 g of argon and 4.0026 g of helium.

Explanation:

39.945 g/mole is the molar mass of argon so 39.948 g of argon are equal to 1 mole of argon.

4.0026 g/mole is the molar mass of helium so 4.0026 g of helium are equal to 1 mole of helium.

We know that Avogadro's number tell us the number of particles in 1 mole of substance which is 6.022 × 10²³.

So in 39.948 g of argon and 4.0026 g of helium contains the same number of atoms, 6.022 × 10²³.

Learn more about:

Avogadro's number

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#learnwithBrainly

4 0
4 years ago
A sample that contains aluminum is reacted with sulfuric acid according to the equation given below. When the aluminum dissolves
GrogVix [38]

Answer:

m_{H_2}=0.0574gH_2

Explanation:

Hello,

In this case, the information about the pressure, volume and temperature are enough to compute the mass of hydrogen assuming its ideal behavior:

n_{H_2}=\frac{PV}{RT}=\frac{739mmHg*\frac{1atm}{760mmHg}*0.722 L}{0.082 \frac{atm*L}{mol*K}*298.15K} =0.0287molH_2

The mass is:

m_{H_2}=0.0287molH_2*\frac{2gH_2}{1molH_2} \\m_{H_2}=0.0574gH_2

Best regards.

5 0
3 years ago
Before the work of Albert Einstein and other prominent scientists of the early 1900's, the predominant view among
Ivanshal [37]
A wave.

Scientists now recognize that light can behave as both a particle and a wave.
3 0
3 years ago
Help out please I really don’t understand these
gavmur [86]
In English

7. Name the elements found in nature in diatomatic form.

8. What is the difference between double and triple single link?
4 0
3 years ago
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