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NARA [144]
4 years ago
12

If anyone could explain which block in the periodic table has metals with changing oxidation numbers and why, it would be greatl

y appreciated

Chemistry
1 answer:
liberstina [14]4 years ago
5 0

Answer:

D-block

Explanation:

Transition metals are metals of the d-block elements located between group 2 and 3 in the periodic table. They are called d-block element because the filling of electrons in their electronic configuration ends in the d-orbital.

Now, they have variable oxidation state because of their partially filled 3d orbital i.e the 3d orbital is not completely filled.

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A hot-air balloon is filled with air to a volume of 3000 m3 at 750 torr and 21°C. The air in the balloon is then heated to 60.°C
valina [46]

Answer: 1.47

Explanation:

The combined gas equation when pressure is constant:

\frac{V_1}{n_1T_1}=\frac{V_2}{n_2T_2}

where,

n_1 =original number of moles of air in the balloon = ?

n_2 =  number of moles of air in the heated balloon = ?

V_1 = initial volume of gas = 3000m^3

V_2 = final volume of gas = 5000m^3

T_1 = initial temperature of gas = 21^oC=273+21=294K

T_2 = final temperature of gas = 60^oC=273+60=333K

Now put all the given values in the above equation, we get the final pressure of gas.

\frac{3000}{n_1\times 294K}=\frac{5000}{n_2\times 333K}

\frac{n_2}{n_1}=1.47

Therefore, the  ratio of the number of moles of air in the heated balloon to the original number of moles of air in the balloon is 1.47

5 0
3 years ago
Write a paragraph (5-7 sentences) describing pH and conductivity.
PilotLPTM [1.2K]

Answer:

pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14. Aqueous solutions at 25°C with a pH less than 7 are acidic, while those with a pH greater than 7 are basic or alkaline. A pH level of 7.0 at 25°C is defined as "neutral" because the concentration of H3O+ equals the concentration of OH− in pure water. On the other hand, electrical conductivity is a non-specific measurement of the concentration of both positively and negatively charged ions within a sample. So the short answer to the question is as follows, the presence of any hydrogen ions present in a substance will impact the pH level and most probably influence conductivity levels. However, hydrogen ions make up only a small part of the ion concentration measured by a conductivity meter.

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Velocity/time= acceleration
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3 years ago
How many SO2 molecules are in 1.76 mol of SO2? How many sulfur atoms and oxygen atoms are there?
Ugo [173]

Answer:

1.76 * 6.02*10^23 = 1.05952*10^24

1.05952*2 = 2.11904 *10^24 oxygen and 1.05952*10^24 sulfur atoms

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2 years ago
What are digital and analog signals in real life? 20 PTS!
rusak2 [61]

Answer:

Analog signal is a continuous signal which represents physical measurements. Digital signals are discrete time signals generated by digital modulation. Human voice in air, analog electronic devices. Computers, CDs, DVDs, and other digital electronic devices.

Explanation:

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3 years ago
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