Heather is doing an acid-base reaction. She has 25.00 mL of hydrochloric acid of unknown concentration in a flask. She wants to add a basic solution to the acid drop by drop, until all the acid has reacted. Which tool would be best for adding the basic solution dropwise and for most precisely measuring the volume of solution added?

a graduated cylinder
an eye dropper
a beaker
a buret

Answers

Answer 1

Answer:

Answer: a buret

A graduated cylinder and a beaker cannot be used. This is because the basic solution needs to be added drop by drop. This is not possible using a graduated cylinder or a beaker because it is difficult to pour drop by drop from these. An eye dropper cannot be used because it does not measure the volume being added.

A buret would be the best choice because it precisely measures the amount being added and we can add the basic solution to the acid drop by drop.

Answer 2

Answer: A burette would be the best tool for the required use.
The process described is called a 'titration'

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Electrons in excited hydrogen atoms are in then = 3 energy level. How many different photon
frequencies could be emitted as the atoms return
to the ground state?
(1) 1 (3) 3
(2) 2 (4) 4

Answers

I can see three different transitions here:

3 --> 1

3 --> 2
followed by
2 --> 1 .

So we should expect to see three different 'colors'
being emitted from this excited mob.

which of the following is the true statement ? a. the magnetic force is perpendicular to the magnetic field direction. b. the magnetic force is parallel to the magnetic field direction. c. the magnetic force is antiparallel to the magnetic field direction. d. none of these

Answers

Answer:

A, magnetic force is always perpendicular to the magnetic field. The direction of the magnetic force is perpendicular to both the direction of the velocity and the direction of the magnetic field.

Final answer:

The magnetic force is always perpendicular to the direction of the magnetic field, according to the Right-Hand Rule in Physics. Neither parallel nor antiparallel statements are correct.

Explanation:

The correct answer to your question, in regard to the relationship between magnetic force and magnetic field direction, is option A. According to the Right-Hand Rule in Physics, the magnetic force exerted on a moving charged particle is always perpendicular to the direction of the magnetic field. This means the force and field are not parallel or antiparallel to each other, but rather, they meet at a 90-degree angle.

Learn more about Magnetic Field here:

brainly.com/question/31599818

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An electron in a mercury atom changes from energy level b to a higher energy level when theatom absorbs a single photon with an energy of 3.06 electronvolts.

Determine the letter that identifies the energy level to which the electron jumped when the mercury
atom absorbed the photon.

Answers

The letter that identifies the energy level to which the electron jumped when the mercury atom absorbed the photon could be L or M.

What is energy level?

Energy levels or electron shells are fixed distances from the nucleus of an atom where electrons may be found.

Letter that identifies the energy level of an atom

A single capital letter K is for the lowest energy level, and capital letters like L and M are used for energy levels further from the nucleus.

Thus, the letter that identifies the energy level to which the electron jumped when the mercury atom absorbed the photon could be L or M.

atom absorbed the photon.

Learn more about energy level here: brainly.com/question/14287666

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The energy is 3.06 electron volts, E = 3.06eV

1eV = 1.6 * 10^-19 J

3.06 eV = 3.06* 1.6 * 10^-19 J = 4.896 * 10^-19 J

A 0.5 kg ball is dropped from rest at a point 1.2m above the floor. The ball rebounds straight upward to a height of 0.7m. What are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor.

Answers

Answer:

4.281 kgm/s upward

Explanation:

Impulse:This can be defined product of force and time. The S.I unit of impulse is Ns.

From Newton's second law of motion,

Impulse = Change in momentum.

I = mΔv....................... Equation 1.

Where m = mass of the ball, Δv = change in velocity of the ball

and Δv = v -u

Where u = velocity of the ball before it hit the floor, v = velocity of the ball after if hit the floor

I = m(v-u) -------------- Equation 2

But

the initial kinetic energy of the ball = potential energy at the initial height (1.2 m above)

1/2mu² = mgh₁

Where h₁ = initial height. or height of the ball before collision

making u the subject of the equation,

u = √(2gh₁)........................ Equation 3

Where h₁ = 1.2 m g = 9.81 m/s²

Substitute into equation 3

u = √(2×1.2×9.81)

u =√(23.544)

u = -4.852 m/s.

Note: u is negative because the ball was moving downward at the first instance.

Similarly,

v = √(2gh₂)............................. Equation 3

h₂ = height of the ball after collision

Given: h₂ = 0.7 m, g = 9.81 m/s²

Substitute into equation

v = √(2×9.81×0.7)

v = √13.734

v = 3.71 m/s.

Also given: m = 0.5 kg,

Substituting into equation 2

I = 0.5(3.71-(4.852)

I = 0.5(8.562)

I = 4.281 kgm/s. Upward.

Thus the impulse = 4.281 kgm/s upward

What is the definition for distance?

Answers

distance is an amount of space between two things or people

Why is it necessary that the solar concentrators used by solar power plants be able to move throughout the day?

Answers

to track the sun as it moves through out the day

To track the sun as it's moving across the sky. Hope this helps!

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