74. Which two temperatures are identical for the same substance?(A) melting point, freezing point
B) melting point, boiling point
C) freezing point, boiling point
D) freezing point, condensation point

Answers

Answer 1

Answer:

Answer:

(A) melting point, freezing point.

Explanation:

For the same substance: when matter is transitioning from solid to liquid (melting) or liquid to solid(freezing), its temperature is fixed at the melting/freezing point, which is the same temperature.

Answer 2

Answer:

Answer:melting,freezing

Explanation:

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What results from gas particles not having a strong attraction to one another?

Answers

variable volume and variable shape:)

An atom of potassium has 19 protons and 19 electrons. If the atom loses 1 electron, what willbe the charge on the ion that forms?

Answers

When a potassium atom loses an electron, it obtains a positive charge and becomes a potassium ion (K +). It goes as follows: K → K + + e - . Therefore, carries a positive charge.

What is potassium ?

The chemical element with the atomic number 19 and the letter K is potassium. Potassium is a silvery-white metal that may be easily and gently sliced with a knife. Within seconds of exposure, potassium metal quickly combines with air oxygen to produce flaky, white potassium peroxide.

Many significant chemicals are formed by potassium. The most prevalent potassium compound is potassium chloride (KCl). It is used to make other compounds, a salt alternative, and fertilizers.

Vegetables, fruit, potatoes, meat, bread, milk, and nuts all contain potassium. It aids neuronal activities and plays a significant part in the human body's fluid system. 95% of the potassium in the body is found inside cells, where it congregates as the ion K+.

Thus, When a potassium atom loses an electron, it obtains a positive charge and becomes a potassium ion (K +).

To learn more about potassium, follow the link;

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If it loses 1 electron, it will now have 1 more proton than electrons.

Thus, the charge would be 1+

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A rock at the top of a 30 meter cliff has a mass of 25 kg. Calculate the rock’s gravitational potential energy when dropped off the cliff. Assuming that energy is conserved and there is no air friction and gravity is 9.8 m/sec., at the bottom of the cliff the rock’s potential energy is completely converted to kinetic energy. Use the formula for kinetic energy to calculate the rock’s speed at the bottom of the cliff. Show all calculations.

Answers

Lets see:-

We have our formula for potential energy, which we are trying to solve for,

PE = mgh or potential energy = mass * gravity * height

So we know that PE all depends on these.

Height : 30 meters
Mass : 25 kg
Gravity (which is always constant) : 9.8 m/s/s

Now add into formula.

PE = 25*30*9.8
PE = 7350 Joules

Answer: PE = 7350 Joules

Now calculate speed:-

7,350 joules/12.5 kg = speed-squared
588 m²/s² = speed-squared
about 24.248 m/s

What is a harmful effect of electrical resistance?

Answers

While voltage does pose a threat, it's mostly the current that causes damage. There must be voltage available to motivate electrons to flow through a victim. Resistance to current causes (in the case of the victim being human or having flesh) burnt tissues, muscles freezes, and fibrillates hearts.

Answer:

Resistance resist the flow of current. This means that if 5V go through a resistance, it'll be reduce down to something below or equal to 5V.

If it gets reduce below 5V, lets say it goes down to 3V, the extra 2V must go somewhere. That 2V energy is converted to heat and dissipated through the resistor.

If there's a big current then the energy dissipated will be huge. And more negery = more heat which can cause fire and burn you.

if you were going to try to get the noble gas argon to combine with another element, would fluorine be a good choice?

Answers

I guess I should say yes.
Due to its high activity, people use it to produce compounds of noble gas. Such as Xe, but for Argon and Fluorine, it requires very special conditions, super low temperature, and other conditions.

Whitch of the following are physical changes ? Rusting
Souring
Melting
Boiling
Freezing