At what phase or phases could water exist at 4.579mm pressure and 0.0098°C?A) solid phase
B) liquid phase
C) solid, liquid and gas phases
D) no phases are present at this point

Answers

Answer 1
Answer: The correct answer is A. The water at this conditions is in the solid phase. This can be verified by using a phase diagram. A phase diagram is a figure which shows the phases of a certain substance at a specific temperature and pressure.
Answer 2
Answer:

Answer:

The answer is C) solid, liquid and gas phases

Explanation:

This point is called the triple point bc solid, liquid, and gas phases can exist together.

hope this helps :)


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During which period did the first large herbivores and carnivores appear?

Answers

The first large herbivores and carnivores appeared during the Mesozoic Era, which is divided into three periods-- Triassic, Jurassic and Cretaceous. The herbivores and and carnivores increased in size during the Jurassic Period. And some of the largest dinosaurs emerged during this period as well.

When two point charges are a distance d apart, the magnitude of the electrostatic force between them is F. If the distance between the point charges is increased to 3d, the magnitude of the electrostatic force between the two charges will be

Answers

Answer:

The magnitude of the electrostatic force decreases by a factor 9

Explanation:

The electrostatic force between two charges is given by:

F=k(q_1 q_2)/(d^2)

where

k is the Coulomb's constant

q1 and q2 are the two charges

d is the distance between the two charges

We see that the magnitude of the force is inversely proportional to the square of the distance. If the distance is increased to 3d: d' = 3d, the new electrostatic force would be:

F'=k(q_1 q_2)/((d')^2)=k(q_1 q_2)/((3d)^2)=(1)/(9) k(q_1 q_2)/(d^2)=(F)/(9)

So, the electrostatic force decreases by a factor 9.

Decreased by a factor of 9

A common source of 'potential difference' or 'voltage' is a cell or battery. Explain

Answers

A battery is actually a association of several cells. So both can be called a source of potential difference.

Which of these components is not necessary for current to flow in a series or parallel circuit?A. wire
B. switch
C. resistor
D. All of these are needed.

Answers

Current requires only an EMF source ... like a battery, or a current already flowing ... and a conducting path ... like wire, ionized air, or something dissolved in water. A switch isn't needed unless you want a quick, easy way to STOP the current. A resistor isn't needed unless you want to be able to dissipate some energy from the current, or limit its magnitude.

A 5c charge experiences a force of 40n when put at a certain location in space. What is the electric field at that location?

Answers

The 'strength' of the electric field is the force on 1C of charge at that point.

At this 'certain location', the field is 40/5 = 8 newtons per coulomb = 8 volts

Which of the following is not a property of water? A) Low density B) Low specific heat C) Low heat of vaporisation D) All of the above

Answers

Answer:

the correct answer is (b) low specific heat