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olasank [31]
3 years ago
11

Which of the following elements listed is the least metallic

Chemistry
1 answer:
Dominik [7]3 years ago
5 0
Where's the list? It depends on which one it is. It could be Chlorine, silicon, or anything on the non metals side of the periodic table if you don't list it. 
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in acetic acid ,there are 4 hydrogen atoms

Explanation:

C H 3 C O O H

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Jonah and Rachel volunteer at the recycling center sorting and organizing recyclable objects. Jonah is sorting aluminum cans and
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A change in form or appearance of matter

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2 years ago
With the exception of our sun, most stars are huge, bright balls of gas located trillions of miles away from earth true or false
Ivenika [448]

Answer:

True

Explanation:

Stars are bright and enormous astronomical bodies that are located at a large distance from the earth. They are made up of the lightest gaseous elements namely hydrogen and helium. These hydrogen atoms undergo the reaction of nuclear fusion, which fuels the energy of the star and allows the star to shine, releasing a large amount of energy. They are located about trillions of miles away from the location of the earth, due to which they appear smaller in size.

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3 0
2 years ago
Read 2 more answers
Sodium metal reacts with water to produce hydrogen gas and sodium hydroxide according to the chemical equation shown below.
UNO [17]

<u>Answer:</u> The enthalpy change of the reaction is -361.6 kJ

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

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

Moles of sodium = 0.025 moles

Molar mass of sodium = 23 g/mol

Putting values in above equation, we get:

0.025mol=\frac{\text{Mass of sodium}}{23g/mol}\\\\\text{Mass of sodium}=(0.025mol\times 23g/mol)=0.575g

We are given:

Mass of water = 100.00 g

Mass of sodium = 0.575 g

Mass of solution = 100.00 + 0.575 = 100.575 g

To calculate the amount of heat absorbed, we use the equation:

q=m\times C\times \Delta T

where,

q = amount of heat absorbed = ?

m = mass of solution = 100.575 g

C = specific heat capacity of solution = 4.18 J/g°C

\Delta T = change in temperature = (T_2-T_1)=(35.75-25.00)=10.75^oC

Putting all the values in above equation, we get:

q=100.575g\times 4.18J/g^oC\times 10.75^oC=4519.34J=4.52kJ

When heat is absorbed by the solution, this means that heat is getting released by the reaction.

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

For the given chemical reaction:

2Na(s)+2H_2O(l)\rightarrow NaOH(aq.)+H_2(g)

When 0.025 moles of sodium is reacted, the heat released by the reaction is 4.52 kJ

So, when 2 moles of sodium will react, the heat released by the reaction will be = \frac{4.52}{0.025}\times 2=361.6kJ

Hence, the enthalpy change of the reaction is -361.6 kJ

6 0
3 years ago
What process in the carbon cycle takes carbon out of air?
Veronika [31]
It is photosynthesis 
<span>
photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct, hope it helps</span>

7 0
2 years ago
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