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Semmy [17]
3 years ago
10

Can someone help me plz. You get 10 points

Chemistry
1 answer:
RSB [31]3 years ago
8 0

Answer:

because you've been told, that the Earth revolves around the Sun. You also probably know that planets other than our own have moons, and the way to test to see whether or not something is true is by experimenting. Thousands of years ago, these things were not widely known. The heavens above were anyone's guess, and the way things were was just the way the gods had made them. It was felt there was no need to truly understand them or put them in any kind of order.

The Greek scholars changed much of that. They were famous for their schools of higher knowledge, which were rather different than ours. Students would gather around a teacher, perhaps in a beautiful grove, and ask questions and discuss among themselves what might be the answers and the best ways to figure out those answers. Many of today's colleges still aspire to this way of learning.

Explanation:

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A 5.024 mg sample of an unknown organic molecule containing carbon, hydrogen, and nitrogen only was burned and yielded 13.90 mg
Dafna1 [17]

Answer:

C8H17N

Explanation:

Mass of the unknown compound = 5.024 mg

Mass of CO2 = 13.90 mg

Mass of H2O = 6.048 mg

Next, we shall determine the mass of carbon, hydrogen and nitrogen present in the compound. This is illustrated below:

For carbon, C:

Molar mass of CO2 = 12 + (2x16) = 44g/mol

Mass of C = 12/44 x 13.90 = 3.791 mg

For hydrogen, H:

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H = 2/18 x 6.048 = 0.672 mg

For nitrogen, N:

Mass N = mass of unknown – (mass of C + mass of H)

Mass of N = 5.024 – (3.791 + 0.672)

Mass of N = 0.561 mg

Now, we can obtain the empirical formula for the compound as follow:

C = 3.791 mg

H = 0.672 mg

N = 0.561 mg

Divide each by their molar mass

C = 3.791 / 12 = 0.316

H = 0.672 / 1 = 0.672

N = 0.561 / 14 = 0.040

Divide by the smallest

C = 0.316 / 0.04 = 8

H = 0.672 / 0.04 = 17

N = 0.040 / 0.04 = 1

Therefore, the empirical formula for the compound is C8H17N

8 0
3 years ago
Which statement is true about oxidation and reduction in an electrochemical cell?
Mila [183]

Answer : The correct option is, (3) Oxidation occurs at the anode and reduction occurs at the cathode.

Explanation :

Electrochemical cell : It is a type of device which is used to convert the chemical energy into electrical energy during the redox reaction.

In the electrochemical cell, there are two electrodes. The electrode on which the oxidation takes place is called the anode (or negative pole) and the electrode on which the reduction takes place is called the cathode (or positive pole). This cell is connected by the salt bridge.

In the external circuit, the electrons flow from the anode (negative pole) to cathode (positive pole) through the voltmeter.

In the inner circuit, the ions flow through the salt bridge.

Hence, the correct option is, (3) Oxidation occurs at the anode and reduction occurs at the cathode.

7 0
4 years ago
Read 2 more answers
Which element is placed in the same period as ruthenium but has a higher atomic number than it
Blababa [14]
Since it is in period five, any element that has a higher atomic number than it could be an answer, therefore, silver, bismuth, and osmium are possibilities.
8 0
4 years ago
Read 2 more answers
Which class of organic compound is most likely to be used in anesthetics?
3241004551 [841]
Ether is the answer :)
6 0
3 years ago
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Describe what the Sim evidence shows you about attraction. Remember to use the words attraction, freedom of movement, kinetic en
Nataly_w [17]

During change of phase, the molecules of a substance acquire enough kinetic energy to overcome the forces of attraction between its molecules.

<h3>What is change of phase?</h3>

Change of phase occurs when a substance acquires enough energy to overcome the forces of attraction between its molecules to transition from one state of matter to another.

During a change of phase, kinetic energy of the molecules of the substance increases due to the application of heat, and the freedom of movement of the molecules increases.

Change of phase can occur as follows;

  • from solid to liquid and vice versa
  • from solid to gas and vice versa
  • from liquid to gas and vice versa

Therefore, during change of phase, the molecules of a substance acquires enough kinetic energy to overcome the forces of attraction between its molecules leading to increased freedom of movement of the molecules.

Learn more about change of phase at: brainly.com/question/502002

3 0
2 years ago
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