CHEMISTRY HIGH SCHOOL

Zero on a pH scale is very _____, and 14 on a pH scale is very _____. A. acidic; basicB. basic; acidic

Answers

Answer 1
Answer: Zero on a pH scale is very A. acidic, and 14 on a pH scale is very basic. 
The lower the number on the scale, the more acidic it is. 
Answer 2
Answer:

Zero on a pH scale is very

A. acidic, and 14 on a pH scale is very basic.

The lower the number on the scale, the more acidic it is.

Explanation:

Acidic and basic are two limits that describe a chemical property chemical. Mixing acids and bases can cancel out or compensate for their greatest effects. A substance that is not acidic nor basic is neutral. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. Explications with a pH smaller than 7 are acidic and solutions with a pH higher than 7 are basic.

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How many liters of oxygen at stp are needed to react with 5.2 * 10 to the 22nd power molecules of hydrogen sulfide?

Answers

For the reaction H2S + 2 O2 -> H2SO4

starting with 5.2 x 10^22 molecules of H2S we can calculate the number of moles H2S by dividing by 6.02 x 10^23

We have 0.086 moles H2S

1 mole of H2S reacts with 2 moles of O2 so we need 0.17 moles of O2

1 mole of all gases at stp occupy 22.4 liters of space

.17 x 22.4 = 3.08 liters of O2 needed to react with 5.2 x 10^22 molecules of H2S

Helppp please help.

Answers

the answer is B
im pretty sure measure wherever the bottom of the curved line is :)

How many milliters of a 0.171 solution contains 1.00 g of NaCl

Answers

:  Molar mass of NaCl: 35.4+22.9 = 58.3 g/mol

X milliliters (=X/1000 liters) of a 0.171M solution contain 0.171*X/1000 moles of NaCl.
0.171*X/1000 moles of NaCl = 58.3*0.171*X/1000 g = 1 g (as given)
58.3*0.171*X/1000 = 1
X = 100.3

Which characteristic is a property of molecular substances?(1) good heat conductivity(2) good electrical conductivity(3) low melting point(4) high melting point

Answers

Answer: Option (3) is the correct answer.

Explanation:

Molecular substances are the substances which have two or more different atoms attached together.

Molecular substances have weak intermolecular forces of attraction thus, they have low melting and boiling point.

They have poor electrical conductivity as the bond formation in molecular compounds is covalent. Therefore, they also have poor heat conductivity.

Hence, out of the given options low melting point is the characteristic property of molecular substances.

Answer is: 3) low melting point.

Molecular substances are usually gases and liquids with low melting point.

The melting point depends on the strength of the intermolecular forces.

Intermolecular forces are the forces between molecules.

Molecular substances have bad heat conductivity and electrical conductivity.

Molecular substances are bonded with covalent bonds.

The atomic mass of an element is calculated using the(1) atomic number and the ratios of its naturally occurring isotopes(2) atomic number and the half-lives of each of its isotopes(3) masses and the ratios of its naturally occurring isotopes(4) masses and the half-lives of each of its isotopes

Answers

The atomic mass of an element is calculated using its masses and the ratios of its naturally occurring isotopes. The answer is number 3.  The rest of the choices do not answer the question above.

Answer:

#3

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

Answers

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
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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