CHEMISTRY COLLEGE

What is the poH of a 3.67 x 10-5 M OH solution and is it acidic, basic, or neutral?

Answers

Answer 1
Answer:

Answer:

The pOH is  4, 44 and the solution is basic.

Explanation:

The pOH is a measure of the concentration of OH (hydroxyl) ions in the solution.

The pOH is calculated as :

pOH = -log (OH-)= -log (3.67 x 10-5 )= 4, 44. In this case, the solution is basic.

The p0H scale ranges from values of 0 to 14 (less than 7.0 is basic and greater than 7.0 is acidic, a pH = 7.0 is neutral)

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Which is the most stable? Carbon (C) Sodium (Na) Helium (He)

Answers

the answer is helium because

Calculate the mass percent of oxygen in KMnO4.

Answers

Answer: 40.496%

Hope this helps! (:

Express the equilibrium constant for the combustion of propane in the balanced chemical equation c3h8(g)+5o2(g)???3co2(g)+4h2o(g)

Answers

according to the balanced equation:
C3H8(g) + 5O2(g) ↔ 3CO2(g) + 4 H2O (g)
      aA    + bB        ↔  cC          +    dD

according to K formula when:
K = concentration of the products / concentration of the reactants

   K = [C]^c[D]^d / [A]^a[B]^b
when [A],[B],[C]and[D] is the concentrations 
and a,b,c and d is the no of moles
∴ K = [CO2]^3[H2O]^4 / [C3H8] [ O2]^5

Answer:

combustion reaction

Explanation:

there is oxides in the equation c3h8(g)+5o2(g)3co2(g)+4h2o(g)

Which of the following observations would be the expected indication that a reaction has taken place when a solution of cesium sulfate is mixed with strontium perchlorate.Bubbling
Formation of percipitate
Formation of soluble salts
Formation of a gas

Answers

Answer:

Formation of precipitate

Formation of soluble salts

Explanation:

Let's consider the molecular equation that takes place when an aqueous solution of cesium sulfate is mixed with an aqueous solution strontium perchlorate.

Cs₂SO₄(aq) + Sr(ClO₄)₂(aq) ⇒ 2 CsClO₄(aq) + SrSO₄(s)

According to the solubility rules:

  • CsClO₄ is a soluble salt.
  • SrSO₄ is an insoluble salt that precipitates as a solid.

For a double displacement reaction to occur, at least one of the products must be insoluble or volatile.

Answer:

It's b) Formation of a precipitate

Explanation:

I took the quiz and got it right.

Four different methods are described for validating the results of a particular analysis. Indicate for each whether the method primarily checks the accuracy of the analysis or the precision of the analysis.a. Five aliquots of the same sample are injected for gas chromatographic analysis by one person on the same day.
i. Accuracy
ii. Precision
b. A known amount of analyte is added to an aliquot of the sample and analyzed with sample.
i. Accuracy
ii. Precision
c. Aliquots from a blood sample are sent to three separate laboratories for analysis using the same method.
i. Accuracy
ii. Precision
d. Identical standard are analyzed by two different methods.
i. Accuracy
ii. Precision

Answers

Answer:

a) Precision

b) Accuracy

c) Accuracy and precision

d) Accuracy

Explanation:

When an experiment is done more than once to determine if the results are statistically ok, two forms of the validations are possible the accuracy and precision. When the values of the various experiments are close to the known value, then they are accurate. When the values are close to each other they are precise. So, sometimes the results are precise but are not accurate, and vice-versa.

a) Here, the person wants to find if the 5 aliquots will have close results, so, he or she is looking for precision.

b) Here the amount of analyte is already known, and the person wants to identify if the value will be the same when analyzed together with another sample, thus he or she is looking for accuracy.

c) Here the three results will be compared with each other (precision) and with the standard value of the method (accuracy).

d) The methods will be tested, and the values will be compared with the standard known value, so the person is looking for accuracy.

Balance the equation: KL+Pb(NO3)2→PbL2+KNO3

Answers

is that Lr? I'm not sure what the L one stand for?
2:1:1:2
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