CHEMISTRY COLLEGE

The amount of order in an isolated system cannot increase; it may only stay the same or decrease. This expresses which of the following?Conservation of mass
The First Law of Thermodynamics
The second Law of Thermodynamics
Kinetic Theory
The definition of work
the definition of heat

Answers

Answer 1
Answer:

Answer:

Second law of thermodynamics.

Explanation:

Second law of thermodynamics states the entropy or order in an isolated system always increases. The isolated system evolve spontaneously toward thermal thermal equilibrium.

For example if a room is untidy and dirty,it will become messy over time and disorder. So when the room is cleaned, there won't be disorderliness and entropy will decrease.

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Which notations represent atoms that have the same number of protons but a different number of neutrons?

Answers

The atoms having the same number of protons but a different number of neutrons have been termed isotopes.

The neutrons and protons are the constituents of the nucleus. The number of protons and electrons is equal in the atom. When two different atoms have the same number of protons the species have been termed isotopes. The atomic number of the species differ that resulting in the different positions in the periodic table.

For more information about the atoms, refer to the link:

brainly.com/question/657632
Atoms of the same element, containing the same number of protons, but different numbers of neutrons, are known as isotopes. Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2).

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is ________.

Answers

Answer:

7

Explanation:

This question is a neutralization reaction.

50 ml of 0.125 M of KOH = (50 x 0.125) = 6.25 ml

In this same way, 50 ml of 0.125M of HCl = 50x0.125

= 6.25 ml

Then KOH is going to neutralise the HCl fully suvh that the pH of the medium is going to be 7

(H+) + (OH-) = H2O

Then Kw = [H=][OH-]

= [H+]² = 10^-14

Such that [H+] = 10^-7

The pH would be = -log [H+]

= -log[10^-7]

When inputted on a calculator this gives us 7

= 7

This is our answer

What is the speed of a basketball that is thrown 18meters in 4 seconds?

Answers

Answer:

4.5m/s

Explanation:

speed = distance/time

speed = 18/4

speed = 4.5m/s

Testbank, Question 098 In the reaction between an alkyne and Na metal in liquid ammonia, the role of Na is as a(n) ___________.a. catalyst
b. electrophile
c. Brønsted base
d. reducing agent
e. Bronsted acid

Answers

Answer:

d. reducing agent

Explanation:

Na acts as a  reducing agent. A reducing agent is a substance whose function is to reduce or donate electrons to another, and by doing so it becomes oxidized.  We can see the mechanism of the reaction in the image attached below.

Final answer:

In the chemical reaction between an alkyne and Na in liquid ammonia, Na acts as a reducing agent, donating electrons and facilitating the reduction of the alkyne to a trans-alkene.

Explanation:

In the reaction between an alkyne and Na metal in liquid ammonia, the role of Na is as a reducing agent. A reducing agent is a substance that donates electrons in a chemical reaction, facilitating the process of reduction. In this specific reaction, Na donates its outer shell electron to the alkyne, facilitating its reduction to a trans-alkene. Therefore, answer d. reducing agent is the correct choice among the given options.

Learn more about Reducing Agent here:

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1. Based on the appearance of your reaction in the beaker, which reagent do you think was consumed and which reagent had some left over? The aluminum was consumed, and copper was left over as seen by the reddish particles. 2. If 5.0 g of iron metal is reacted with 15.0 g of Cl2 gas, how many grams of ferric chloride will form? About 14.52 grams will form. 3. For the reaction above the amount of ferric chloride obtained in the lab was 9.15 grams. Calculate the percent yield. The percent yield would be around 63.02%. 4. What are some reasons for obtaining a percent yield of less than 100 percent? Factors such as the reactants not reacting completely, human error in the experiment, the reactants might have too large of a surface area for reaction, multiple reactions occurring within an experiment, temperature, etc.

Answers

Answer:

1. Al is consumed first and CuSO₄ remains left.

2. The grams of ferric chloride that forms is 14.5 g.

3. The percent yield is 63.1%

4. Trace of impurities present in the reagents, bad manipulations when preparing solutions, etc.

Explanation:

1. The reaction is:

2Al + 3CuSO₄ = Al₂(SO₄)₃ + 3Cu

The number of moles of Al is less than the number of moles of CuSO₄. Therefore, Al is the limiting reagent and CuSO₄ is the excess reagent. This means that Al is consumed first and CuSO₄ remains left.

2. The reaction is:

2Fe + 3Cl₂ = 2FeCl₃

The number of moles of Fe is:

n_(Fe) =(m_(Fe) )/(MW_(Fe) ) =(5)/(55.85) =0.0895moles

The number of moles of Cl₂ is:

n_(Cl2) =(15)/(70.9) =0.211moles

We know that 2 moles of Fe react with 3 moles of Cl₂, thus:

2 moles Fe---------------3 moles Cl₂

0.0895 moles Fe-------X moles Cl₂

Clearing X:

Xmoles_(Cl2) =(3*0.0895)/(2) =0.134moles

It needs 0.134 moles of Cl₂ but it only has 0.211 moles, thus, Cl₂ is the excess reagent. Fe is the limiting reagent.

2 moles Fe-----------2 moles FeCl₃

0.0895 moles Fe------X moles FeCl₃

Clearing X:

Xmoles_(FeCl3) =(2*0.0895)/(2) =0.0895moles

m_(FeCl3) =0.0895molesFeCl3*(162.2gFeCl3)/(1molFeCl3) =14.5g

3. The actual yield of FeCl₃ is 9.15 g, the theoritical yield is 14.5 g, thus, ther percent yield is:

Percent-yield=(Actual-yield)/(Theoritical-yield) *100=(9.15)/(14.5) *100=63.1%

4. Trace of impurities present in the reagents, bad manipulations when preparing solutions, etc.

Ri1. Among these which is the example of compound?
a) sulphur
b) iron
c) ammonia
der​

Answers

Answer:

Ammonia is a compound.

Explanation:

A compound is composed of two or more separate elements. Ammonia is NH3, which happens to be two different elements.
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