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katen-ka-za [31]
3 years ago
8

Drug testing of athletes and other individuals is big business.

Chemistry
1 answer:
ziro4ka [17]3 years ago
7 0

Answer:

bioanalytical chemistry

Explanation:

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Find the ph of of 100 ml of an aqueous 0.43m baoh2 solution
denpristay [2]
Answer is: pH of barium hydroxide is 13.935.
Chemical dissociation of barium hydroxide in water:
Ba(OH)₂(aq) → Ba²⁺(aq) + 2OH⁻(aq).
c(Ba(OH)₂) = 0.43 M.
V(Ba(OH)₂) = 100 mL ÷ 1000 mL/L = 0.1 L.
n(Ba(OH)₂) = 0.43 mol/L · 0.1 L.
n(Ba(OH)₂) = 0.043 mol.
From chemical reaction: n(Ba(OH)₂) : n(OH⁻) = 1 : 2.
n(OH⁻) = 0.086 mol.
c(OH⁻) = 0.86 mol/L.
pOH = -logc(OH⁻).
pOH = 0.065.
pH = 14 - 0.065 = 13.935.
4 0
2 years ago
4 Weathering Assessment
alexira [117]

Answer:

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6 0
2 years ago
___au2s3 ___h2 → ___au ___h2s
liberstina [14]
The best way to balance an equation is to balance one atom at a time.
You start with two Au atoms on the left, so you know the coefficient of Au on the right has to be 2. So at first we get,
Au2S3 + H2 --> 2Au + H2S
Then, notice you have 3 sulfur atoms on the left, so you need three on the right.
Our equation becomes
Au2S3 + H2 --> 2Au + 3H2S
Lastly, we now have six hydrogen atoms on the right, and only two on the left, so we assign a three to the H2 on the left
Au2S3 + 3H2 --> 2Au + 3H2S Is the balanced final equation.

7 0
2 years ago
What is the relationship between specific heat and the rate of heating?
s344n2d4d5 [400]

Answer:

the rate of heat transfer is directly proportional to the mass flow rate.

Explanation:

There is an elementary equation from basic thermodynamics that states that the rate of heat transfer (Q) equals the mass flow rate (M) times a Constant (the specific heat of water) times the Delta T (fluid temp out minus fluid temp in): Q = M x C x Delta T In other words, the rate of heat transfer is directly proportional to the mass flow rate.

4 0
2 years ago
If 45.0 mL of a 4.00 M sodium sulfate (Na2SO4) solution is used for the reaction shown above, how many moles of sodium ions were
Scrat [10]

Answer:0.360

Explanation:

I had this on ck12 yesterday

6 0
2 years ago
Read 2 more answers
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