If a liquid spontaneously turns into a gas below the critical temperature, it has evaporated.TRUE

FALSE

Answers

Answer 1

Answer:

Answer:

FALSE

Explanation:

Critical temperature can be defined as the temperature at which a substance can exist as a liquid. Below the critical temperature, the substance will freeze and above the critical temperature, the substance will evaporate.

Note: Liquid cannot evaporate below it's critical temperature

Answer 2

Answer: False because if the water goes below critical temp it would be frozen

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At STP 10 grams of CO can be dissolved in 3 L of water. Calculate the solubility of carbon monoxide at 200kPa.

Which statement correctly describes a sample of gas confined in a sealed container? (1) It always has a definite volume, and it takes the shape of the container. (2) It takes the shape and the volume of any container in which it is confined. (3) It has a crystalline structure. (4) It consists of particles arranged in a regular geometric pattern.

Answers

A gas does not have a specific shape or volume (so we reject option A), instead it adjusts itself to the container (which is further influenced by other forces such as gravity and temperature) and it with time, willl fill the whole container evenly, so the correct answer is:
(2) It takes the shape and the volume of any container in which it is confined

Which of the following is TRUE about a physical change in matter?O A physical change changes the identity of the substance
O A physical change does not change the chemical formula of the substance
O A physical change has similar characteristics as a chemical change.
A physical change is a change in how the substances react with other substances.

Answers

The correct answer is physical change does not change the chemical formula of the substance.

What is a physical change?

A physical change is one in which only the physical state of matter is altered.
Its chemical characteristics have not changed.
A physical change is usually brought about by increasing the temperature or exerting pressure, or both.
The original state of matter is restored by reversing the condition, that is, lowering the temperature, lowering the pressure, or both.
Physical changes, in other words, are reversible.

Learn more about Physical change here:

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Answer:

B. a physical change does not change the chemical formula of the substance

Explanation:

Physical change does not change the substance or identity of an object

Find the mass of 3.00 mol of acetic acid, C2H4O2.

Answers

Molar mass

C₂H₄O₂ = 60.0 g/mol

n = mass / molar mass

3.00 = mass / 60.0

m = 3.00 * 60.0

m = 180 g of C₂H₄O₂

hope this helps!

Under which conditions of temperature and pressure would a 1-liter sample of a real gas behave most like an ideal gas?(1) 100 K and 0.1 atm
(2) 100 K and 10 atm
(3) 500 K and 0.1 atm
(4) 500 K and 10 atm

Answers

Answer : The correct option is (3) 500 K and 0.1 atm.

Explanation :

A real gas behaves ideally at high temperature and low pressure.

The ideal gas equation is,

$PV=nRT$

where,

P = pressure of gas

V = Volume of gas

R = Gas constant

T = temperature of gas

n = number of moles of gas

The ideal gas works properly when the inter-molecular interactions between the gas molecules and volume of gas molecule will be negligible. This is possible when pressure is low and temperature is high.

Therefore, the correct option is (3) 500 K and 0.1 atm.

Answer:

The correct answer is (3).

Explanation:

A real gas can behave ideally at high temperatures and low pressures. The ideal gas is correctly characterized when the intermolecular interactions between the gas molecules and the volume of the gas molecule are negligible. This is only possible when system conditions are at low pressures and high temperatures.

Have a nice day!

25 Which of the following is a correct statement describing photosynthesis?

Plants make glucose and oxygen by taking in carbon dioxide and water.
Plants take in oxygen and carbon dioxide to make glucose and water.
Plants take in oxygen and water to make carbon dioxide and glucose.
Plants take in glucose and carbon dioxide to make water and oxygen.

26

Under what condition will a marshmallow and a rock fall at the same speed?

In the water
The marshmallow must be thrown down with greater force
This can never happen, because of the different masses
In a vacuum

27

Which of the following would exert about 1000 Newtons of force?

A baby
A large man
A safety pin
A dump truck

Answers

25: A) Plants make glucose and oxygen by taking in carbon dioxide and water.
26: D) In a vacuum
27: B) A large man (1000 newtons is approximately 224 lbs of force)

Is the following chemical equation balanced?

2Na + 2H2O 2NaOH + H2

Answers

Answer: YES

Explanation: The given chemical equation can be balanced by balancing the stiochiometric number of each and every element.

This rule is in accordance with the Law of Conservation of Masses which states that the masses of the elements in any chemical equation are constant at any instant of time.

Thus the given equation can be written as

$2Na + 2H2O \rightleftharpoons 2NaOH + H2$