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3 years ago

In a chromatography experiment, chlorophyll pigments are separated using paper. What is the stationary phase in this experiment?

2 answers:

3 0

The method of separation used was paper chromatography and the pigments were separated based on rates moved by each pigment. The extract was also separated based on the solubility of the various components and was found to contain green chlorophyll and yellow carotenoids.

All types of chromatography employ two different immiscible phases in contact with each other namely the mobile phase and the stationary phase.

nordsb [41]3 years ago

3 0

The stationary phase is the substance fixed in place for the chromatography experiment to begin, in this case paper.

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Does data from mass spectrometry indicate that modern scientists have made modifications to Dalton's model?

Viktor [21]

$http://apchemresources2014.weebly.com/uploads/9/7/6/4/9764824/mass_spectrometry.pdf$

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3 years ago

The water bottle contains 575 grams of water at 80°C. The water eventually cools to

Jet001 [13]

Answer:

–23000 Calories.

NOTE : The negative sign indicates that heat has been loss to the student back.

Explanation:

The following data were obtained from the question:

Mass (M) of water = 575 g

Initial temperature (T1) = 80 °C

Final temperature (T2) = 40 °C

Heat (Q) transferred =.?

Next, we shall determine the change in temperature (ΔT).

This is illustrated below:

Initial temperature (T1) = 80 °C

Final temperature (T2) = 40 °C

Change in temperature (ΔT) =?

Change in temperature (ΔT) = T2 – T1

Change in temperature (ΔT) = 40 – 80

Change in temperature (ΔT) = –40°C

Finally, we shall determine the heat transferred. This can be obtained as follow:

Mass (M) of water = 575 g

Change in temperature (ΔT) = –40°C

Specific heat capacity (C) of water = 1 Cal/g°C

Heat (Q) transferred =.?

Q = MCΔT

Q = 575 × 1 × –40

Q = –23000 Calories

NOTE : The negative sign indicates that heat has been loss to the student back.

8 0

3 years ago

Which half-reaction correctly represents reduction?

Neko [114]

Answer: B. Ca2+ + 2e- ---------> Ca

Explanation:

Reduction involves the gaining of electrons as well as a decrease in the oxidation state of the atom or ion.

In this case; Ca2+ gains two electrons and the oxidation state is reduced from +2 to 0.

Ca2+ + 2e- ---------> Ca

5 0

3 years ago

The following reaction was carried out in a 3.00 L reaction vessel at 1100 K:

Nady [450]

Answer:

$Q=0.840$

Explanation:

Hello,

In this case, since the given undergoing chemical reaction is correctly balanced, the reaction quotient is computed as well as the equilibrium constant but in terms of the given concentrations that are:

$C_{C}=\frac{5.25mol}{3.00L} =1.75M\\C_{H_2O}=\frac{12.2mol}{3.00L} =4.07M\\C_{CO}=\frac{3.90mol}{3.00L}=1.30M\\C_{H_2}=\frac{7.90mol}{3.00L} =2.63M$

In such a way, the reaction quotient turns out:

$Q=\frac{C_{CO}C_{H_2}}{C_{H_2O}}=\frac{1.30M*2.63M}{4.07M}\\ Q=0.840$

Taking into account that carbon is not included since it is solid.

Best regards.

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2 years ago

The pressure of a gas is 750 torr when its volume is 400. ml. Calculate the

ololo11 [35]

Answer:

a. 0.66 atm

Explanation:

Pi = 750 torr = 0.99 atm. Pf = ?

Vi = 400 ml Vf = 600ml

Using PiVi = PfVf

Then 400ml × 0.99atm = Pfatm × 600ml

Solving for Pf, we have,

Pf = (400ml × 0.99atm)/600ml

Pf = 0.66atm

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2 years ago