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sergey [27]
3 years ago
12

You make dilutions of curcumin stock solution and measure the absorbance of each dilution to obtain the following data: Conc. (M

) Abs. 1.60E-05 1.93 1.21E-05 1.62 8.09E-06 1.08 4.04E-06 0.44 2.02E-06 0.13 Which data points should you keep when making your calibration curve? Choose all that apply. (Hint: Plot the data.)

Chemistry
1 answer:
algol133 years ago
8 0

Answer:

The following data point should be kept when making your calibration.

1.21E-05 M

1.60E-05 M

8.09E-06 M

4.04 E-06 M

Explanation:

From the graph it is obvious that the reading for the concentration 2.02E-06 M does not fall on the straight line. So this point should not be taken to construct the calibration plot.

Find attached of the graph.    

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If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?
loris [4]

Answer:

Yellow

Explanation:

Thymol blue has a brownish-green or reddish-brown color and is a good pH indicator. It changes from red to yellow at a pH 1.2–2.8 ( acidic) and then from yellow to blue at a pH of 8.0–9.6( alkaline).

Nitric acid is a strong acid which means the pH indicator will change to yellow.

3 0
3 years ago
How much heat in joules is gained when a 34.5 g bar of gold is heated from 26.4°C to 75.3°C ?specific heat of gold on 0.129 J/gr
Sati [7]

Answer:

Q = 217.63J

Explanation:

Data;

Mass = 34.5g

T1 = 26.4°C

T2 = 75.3°C

c = 0.129J/g°C

Energy (Q) = mc(T2 - T1)

Q = 34.5 * 0.129 *(75.3 - 26.4)

Q = 4.4505 * 48.9

Q = 217.629J

Q = 217.63J

The heat gained was 217.63J

7 0
3 years ago
What happened to particles in matter when it is heated up
vichka [17]

Answer: When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.

Explanation: Hope this helps!

4 0
3 years ago
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Here is the chemical reaction that represents solid lead chloride dissolving in water:
zubka84 [21]

Answer:

B. Add more chloride ions

Explanation:

Because we know based on lechatlier that any disturbance to equilibrium will make the shift act accordingly. If something is removed it wants to shift to side where it is removed to compensate for the change, if something is added it wants to move away from it to minimize the change.

Therefore, if you add chloride ions, the equilibrium shifts to left to make more solid lead chloride.

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What volume of hydrogen gas is produced at STP as sulfuric acid reacts with 120 g of solid metallic calcium in a single replacem
strojnjashka [21]

Answer: 67.2 liters

Explanation: lucky guess and I got it right on a test.

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