PHYSICS HIGH SCHOOL

Short answerYou are provided a 20-mL solution of methanol and water.
a. Name the technique that you would use to separate and identify the components of the solution.
b. Provide specific details of the method used.
c. State the advantage of the method you choose.

Answers

Answer 1
Answer: a. you can separate the components through chromatographic techniques (GC or HPLC). The advatage of using a high-tech chromatography equipment is the simultaneous separation - contents analysis. 

b. chromatography is an affinity based separation which means using specific adsorbents, it can separate the component with a higher affinity to the adsorbents.

c. the advantage of which is the precision as well as the simultaneous separation and contents analysis.

Related Questions

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Which best explains why the shapes of a liquid can change
Of the waves listed, the one with the longest wavelength is a(n)a. X ray. b. radio wave. c. microwave. d. visible light wave.
A basketball player is 5.22 m from the goal when she shoots the ball at 10.0 m/s at a 65.0 degree angle. How much time does it take the hall to reach the horizontal position of the goal?
An article in a magazine denies that Earth is warming and climate change is occurring. The writer reports that this season was the snowiest winter on record for the Northeast, with lower than average temperatures for the region. Because of the low temperatures, the writer concludes that climate change cannot possibly be occurring. What question should you ask the writer to clarify whether his stance on climate change is scientifically sound?(A) Did the snowstorms cause extensive damage?(B) Was this the coldest month on record for this region?(C) Were the snowfall totals of each storm larger or smaller than last year?(D) Were long-term temperature changes investigated in addition to short-term change?

There is little sunlight at high latitudes during the winter, so few crops can grow even if temperatures are regulated. To address this problem, special lamps can be used in greenhouses.These lamps allow plants to grow during the winter months. Scientific knowledge of which topic was necessary to solve this problem?

Answers

Answer;

the colors of light that plants require for photosynthesis

Explanation;

The color of light used for photosynthesis depends on the pigment in the plant. For example, green plants with chlorophylls and carotenoids have a maximum activity with violet-blue and red light.

White light contains various colors, including red, orange, yellow, green, blue, indigo and violet. When plants harvest light for photosynthesis, they only absorb a few colors and reflect the rest. Plants appear green because chlorophyll absorbs other colors and reflects green.

Answer:

the colors of the light that plants require for photosynthesis

Explanation:

pretty sure im right

A block weighing 35 N is resting on a steel table (us = 0.40).The minimum force to start this block moving is ___ N.

Answers

The static friction force is a force that prevents motion of an object kept on a surface, due to the interaction of the surface of the object and the surface on which it is kept

  • The minimum force required to start the block moving is 14 N

Reason:

The known parameter are;

The weight of the block, W = 35 N

The static friction of the surface of the table surface, \mu_s = 0.40

Required:

To find the minimum force to start the block moving

Solution:

The force required to start the block moving is given by the frictional force that needs to be surpassed

Force required, F = Force of friction

Force of friction = Normal reaction × Coefficient of static friction

On a flat surface, the normal reaction = The weight of the object

∴ Force of friction, F_f = Weight of the object × Coefficient of static friction

Which gives;

F_f = W * \mu_s

F_f = 35 \, N * 0.40 = 14 \, N

Force required, F = Force of friction, F_f = 14 N

The minimum force required to start the block moving, F = 14 N

Learn more about the static friction force here:

brainly.com/question/13877320

Answer: 14

Explanation:

Force(normal)*coefficient

Electronic signals that are smoothly varying signals produced by continuously changing the voltage or current in a circuit area. digital signals.
b. cathode rays.
c. diode signals.
d. analog signals.

Answers

Answer: The correct answer is "analog signals".

Explanation:

Digital signal: This signal varies as 0 or 1. It is discrete signal.

Cathode rays: They are the streams of the negatively charged particles.

Diode signals: Diode is a semiconductor device. It changes the alternating signal to the direct signal.

Analog signals: In this signal, the signal is varying by continuously changing the direction voltage or current with time. It is a continuously varying signal.

In the given problem, electronic signals that are varying signals produced by continuously changing the voltage or current in a circuit are analog signals.

Therefore, the correct option is (d).
The right answer for the question that is being asked and shown above is that: "c. diode signals." Electronic signals that are smoothly varying signals produced by continuously changing the voltage or current in a circuit are diode signals.

What is the pitch of a sound wave?

Answers

That's the impression you get from the sound, that you call 'high' or 'low', determined by the FREQUENCY of the wave.

A 30 N rock falls from a 40 m cliff. At what point during its fall are itspotential and kinetic energies equal?

Answers

Answer:

Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.

Explanation:

Potential and Kinetic Energy

The gravitational potential energy is the energy an object has due to its height above the ground. The formula is

U=mgh

Where:

m = mass of the object

g = acceleration of gravity (9.8~m/s^2)

h = height

Note we can also use the object's weight W=mg into the formula:

U=Wh

The kinetic energy is the energy an object has due to its speed:

\displaystyle K=(1)/(2)mv^2

Where v is the object's speed.

Initially, the object has no kinetic energy because it's assumed at rest.

The W=30 N rock falls from a height of h=40 m, thus:

U=30*40=1,200 J

Since the sum of the kinetic and potential energies is constant:

U' + K' = 1,200 J

Here, U' and K' are the energies at any point of the motion. Since both must be the same:

U' = K' = 600 J

U'=Wh'=600

Solving for h':

\displaystyle h'=(600)/(W)=(600)/(30)=20~m

Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.

Two dogs pull on a toy. One pulls with a force of 10N, the other with a force of 15N. In what relative directions can the dogs act to give the toy the smallest acceleration?

Answers

They must act one opposite of the other, so the resultant hits the minimum of 5 N. When they go in the same direction you get the maximum of 15 N.
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