CHEMISTRY HIGH SCHOOL

Given the balanced equation:2C + 3H2==> C2H6
What is the total number of moles of C that must completely react to produce 2.0 moles of C2H6?
(1) 1.0 mol (3) 3.0 mol
(2) 2.0 mol (4) 4.0 mol

Answers

Answer 1
Answer:

Answer: The correct answer is option 4.

Explanation:

2C+3H_2\rightarrow C_2H_6

According to the reaction, 1 mol of C_2H_6 is obtained from 2 moles of C gives

Then, 2 moles of C_2H_6 will be obtained from:

(2)/(1)* 2 moles of C =4 moles

Hence, the correct answer is option 4.
Answer 2
Answer: The answer is (4) 4.0 mol. This is a stoichiometry problem. You start with 2.0 mol of C2H6 and obtain the moles of C by multiplying 2.0 by the mole ratio, in this case 2. 2.0*2=4.0mol.

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Which substance increases in solubility as the temperature decreases? 1) KClO3 2) NH3 3) KNO3 4) NaCl

Dr. Bunsen has a problem—he stored a rack of six bottles filled with clear colorless liquids too close to a heat vent and the labels fell off of each of the bottles. He needs your help in order to correctly identify each of the solutions. Below is a list of the solutions:  Pure DI water  0.10 M AgNO3  0.20 M HCl  0.20 M HNO3  0.20 M KOH  0.50 M NaHCO3 we are provided with ph paper and phenolphthalein

Answers

What!  Your teacher is crazy - half of those things will catch on fire if they are mixed!  You should double check to make sure you have them written down right or you could really get hurt!

If you mix HNO3 and HCl you will get a brown gas (don't light it or smell it!).  The one that is heavier is the HNO3, because it has more atoms in it.  Then, mix the silver one (AgNO3) with KOH - it will give a silver coating to the plastic (search for Tollins Test to see what it looks like).  DI water will absorb CO2 from the air and make carbonic acid, so the one that is acidic will be the water.

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The standard on which the atomic mass unit is based is the mass of a (1 point)proton. neutron. chlorine-35 atom. carbon-12 atom.

Answers

D. carbon-12 atom I hope this helps :)

Carbon-12 Atom is correct :)

Argon-39 has a half-life of 269 years. How long will it take for 52.5 g of a 60.0 g sample to decay to its daughter isotope?

Answers

The years that will take or 52.5 g of a 60.0 g sample to decay to its daughter isotope is 807 years.

What is half-life?

Half-life is the time required to decay or undergo half the process of any element.

Given the sample is 60.0 g in which 52.5 g sample has to be decay

so, 60 - 52.5 = 7.5 g

It can be seen that it goes three half life

60 >30 >15 >7.5

Now, the half life is 269

269 × 3 = 807 years.

Thus, the years taken are 807 years.

Learn more about isotopes

brainly.com/question/11680817

#SPJ2
For 60.0 g sample, if it remains 60-52.5=7.5 g, it will go through 60->30->15->7.5, 3 half-life. So the time being taken is 269*3=807 years.

Which one is stronger acid with ph=5 or ph=2

Answers

pH=2. The lower the pH level, the higher the acidity is. Meanwhile, the higher the pH, the more basic the substance is
Each change in pH is a change in Hydrogen Ion concentration by a factor of 10. So a pH 2 acid is 1000 times stronger than a pH 5 acid.

If 2.0 moles of a substance are dissolved in 2.0 liters of solution, then the molarity of this solution is:0.5 M

1.0 M

1.5 M

2.0 M

Answers

There are a number of ways to express concentration of a solution. This includes molarity. Molarity is expressed as the number of moles of solute per volume of the solution. The concentration of the solution is calculated as follows: 

Molarity = 2.0 moles / 2.0 L

Molarity = 1.0 M

Answer:

1.0 M

Explanation:

Hello,

Molarity is a unit of concentration accounting for the amount of the moles of a solute per liter of solution as shown below:

M=(n_(solute))/(V_(solution))

In such a way, given the information on the statement, the resulting molarity turns out into:

M=(2.0 mol)/(2.0 L)=1.0(mol)/(L)=1.0M

Do not forget that mol per liters means molar units (M) as well.

Best regards.

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Answers

Answer:

If you change the number of protons an atom has, it becomes a different element. If you change the number of nutrons it has, it becomes a different isotope.

Explanation:
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