CHEMISTRY HIGH SCHOOL

The reduced vapor pressure at high altitudes causes a liquid to boil at a temperature.A. Lower
B. Higher

Answers

Answer 1
Answer:

Answer:

            Lower Temperature

Explanation:

                        The boiling point is defined as the temperature at which the vapor pressure of a given liquid becomes equal to the external pressure or atmospheric pressure. Boiling point is mainly effected by following factors:

1) Inter-Molecular Interactions:

                                                     Greater the intermolecular interactions greater will be the boiling point because more energy is required to overcome these intermolecular interactions.

Example:

                                          Water  =  100 °C

                              Diethyl ether  =  34.5 °C

Water requires more energy because it contains hydrogen bond interactions which are considered the strongest intermolecular interactions. While, Diethyl ether lacks Hydrogen bondings.

2) External Pressure:

                                    The boiling point also varies with changing the external pressure for the same solvent. Greater the external pressure greater will be the boiling points and vice versa.

Example:

Water:

                    External Pressure                       Boiling Point

                                1 atm                                         100 °C

                             0.921 atm                                     98 °C

                             0.425 atm                                     72 °C
Answer 2
Answer: At higher altitudes (and thus lower atmospheric pressures), water boils at a lower temperature. This is because the lack of vapor pressure at that altitude doesn't constrain the speed of the molecules with barometric pressure. Therefore, the water begins boiling at a lower temperature. This is often a disadvantage because even if the water is boiling, it won't be hot enough for meals (which is why heat and temperature are distinct). That's why we have pressure cookers, which manage to keep a stable boiling point.
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What is the mass in grams of 2.0 moles of NO2

Answers

Answer:

The mass of 2 moles of NO₂ is 92 grams.

Explanation:

Given that,

Number of moles, n = 2 moles

We need to find the mass of 2 moles of NO₂. We know that the number of moles is given by the formula as :

n=(m)/(M)

m is the given mass

M is the molar mass of NO₂, M=14+16* 2=46\ g

m=n* M\n\nm=2* 46\n\nm=92\ g

So, the mass of 2 moles of NO₂ is 92 grams. Hence, this is the required solution.
Molar mass NO₂ = 46.0 g/mol

1 mole -------- 46.0 g
2.0 moles ----- ?

Mass (NO₂) = 2.0 x 46.0 / 1

=> 92.0 g

hope this helps!

A liquid is placed in an evacuated, sealed flask. When will this closed system reach dynamic equilibrium?

Answers

The liquid that is placed in an evacuated sealed flask will reach in dynamic equilibrium if the amount of liquid inside the flask will stop converting into vapor. This process is to balanced the amount of substance of both phases inside the flask. 

Given the reaction below, which is the reduced substance?Mg + Cl2 mc006-1.jpg Mg2+ + 2Clmc006-2.jpg

Answers

In the reaction:
Mg + Cl2 --> Mg2+ + 2Cl-

The reduced substance is the substance that the gained electron/s.
Looking at the substances:
Mg has a neutral charge, after the reaction, it gained a charge of 2+. This means, it lost 2 electrons.
Cl2 has a neutral charge, after the reaction, it gained a charge of -1. This means it gained 2 electrons.

Therefore, the reduced substance is Cl2.

the reduced substance is Cl2.

Are the following Mineral or Ore?

Answers

Answer:

1.Mineral

2.Ore

Explanation:

Which product forms from a reaction between beryllium (Be) and arsenic (As)?A. BeAs2
B. BeAs
C. Be3As2
D. Be2As3

Answers

Answer:

Be3As2

Explanation:

Answer:

C) Be3As2

Explanation:

A.P.E.X

Which is true about the dissolving process in water? Nonpolar solutes dissolve easily in water. Solute molecules surround water molecules. Molecules or ions of a solute spread throughout the water molecules. Water molecules are repelled by solute ions at the surface of the solute.

Answers

The simple principle for solute dissolution in a particular solvent is "like dissolves like". In the case of water, a solute will dissolve if it is polar. This is because water is a polar solvent. A polar substance is one which has particles that have a net charge on them. This net charge produces forces of attraction. When a polar solute is added to water, the water molecules are attracted to the solute particles and they attach to them. After attaching to the water molecules, the solute particles are dispersed throughout the water. Therefore, the answer is molecules or ions of a solute spread throughout the water molecules.

Answer:

C. Molecules or ions of a solute spread throughout the water molecules.

Explanation:

C. Molecules or ions of a solute spread throughout the water molecules.
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