classify the following substances as acidic, basic, or neutral: a. a soapy solution, pH = 9 b. a sour liquid, pH = 5 c. a solution with four times as many hydronium ions as hydroxide ions

Answers

Answer 1
Answer: A. Soapy solution (pH of 9) = basic
B. Sour liquid (pH of 5) = acidic
C. Solution with four times as many hydronium (H+) ions as hydroxide ions (OH-) = acidic

Soapy solution with a pH of 9 is basic because it has a pH greater than 7. The same goes for the sour liquid with a pH of 5, which has a pH lower than 7, making it acidic. The word sour also hints at it being acidic because of the definition of Bronsted acids. Finally, higher H+ ion concentrations make a solution more acidic.

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Predict Two objects have unlike charges. Howwould the electric force between the two objects
#pany. Image Credits: () OHM; (b) Rob Matheson
change as they are moved apart?
9 Ev
ne
T
b

Answers

Answer:b

Explanation:

The combined gas law relates which of the following? a. pressure and volume only
b temperature and pressure only
c. volume and temperature only
d. temperature, pressure, and volume

Answers

Reffering to its definition, the combined gas law relates d. temperature, pressure, and volume

Final answer:

The combined gas law relates temperature, pressure, and volume and can be represented by the equation P1V1 / T1 = P2V2 / T2.

Explanation:

The combined gas law relates temperature, pressure, and volume. It states that the product of the initial pressure, volume, and temperature of a gas is equal to the product of the final pressure, volume, and temperature. This law can be represented by the equation:

P1V1 / T1 = P2V2 / T2

where P1 and P2 are the initial and final pressures, V1 and V2 are the initial and final volumes, and T1 and T2 are the initial and final temperatures.

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According to Newton's Third Law of Motion, what happens when two objects of unequal masses collide? A.
The object with the larger mass will have greater damage.

B.
The object with the smaller mass will continue forward due to inertia.

C.
They will push away from each other in proportion to their masses.

D.
They will both make a sudden stop.

Answers

Newton's third law is that for every action, there is an equal and opposite reaction.
Damage is not a part of physics, at least I don't think it is. 
Is just downright wrong. If anything, the smaller mass will be pushed forward with the heavier mass. 
C Sounds correct
D It'
s wrong, because the masses are not equal, or else they would stop.

a 0.40kg soccer ball approaches a player horizontally with a velocity of 18m/s north. the player strikes the ball and causes it to move in the opposite direction with a velocity of 22m/s. what impulse was delivered to the ball by the player?

Answers

Impulse = Ft = (m)(delta v)
delta v = change in velocity = velocity final - velocity initial.
= -22m/s - +18m/s = -40m/s.
mdeltav = (0.40kg)(-40m/s) = -16kgm/s or -16Ns.

Final answer:

Impulse corresponds to the change in momentum. Given a soccer ball weighing 0.40kg moving first at 18m/s north and then hit in the opposite direction at 22m/s, the impulse delivered to the ball by the player is approximately 16 kg.m/s in the opposite direction of the initial movement.

Explanation:

In the field of physics, impulse is defined as the change in momentum of an object upon interaction with an external force and is calculated by multiplying the force applied to the object by the time interval (duration) the force was acting. When a soccer player strikes the ball, he or she applies a force that changes the soccer ball's momentum.

Considering your question about the soccer ball, the initial momentum of the ball can be calculated by multiplying its mass (0.40 kg) by its velocity (18 m/s), giving 7.2 kg.m/s north. When the player hits the ball, it moves in the opposite direction (south) with a velocity of 22 m/s. Thus, the final momentum of the ball is 0.40 kg x -22 m/s = -8.8 kg.m/s.

Impulse is the change in momentum, so it's the final momentum minus the initial momentum, which equates to -8.8 kg.m/s - 7.2 kg.m/s= -16 kg.m/s south or +16 kg.m/s north, depending on the coordinate system you choose (north could be either positive or negative). Since the direction reversed, this is why we have a negative sign.

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A stuntman jumps from the roof of a building to the safety net below. How far has the stuntman fallen after 1.6 seconds?

Answers

how tall is the building?
u need to divide the height by 1.6 to get your answer

Answer:

Explanation:

12.5m

Computers have become a familiar ___ of communication, connecting people around the world.a. mediation
b. proponent
c. medium
d. exposition

Answers

they're a medium (c) of communication

A. mediation is what you so when you want to bring the sides of conflict together

b. is a person who is advocating something

d. is a presentation of some opinion or facts.