All categories

3 years ago

PLZ HELP I NEED THIS NOW I WILL GIVE BRAINLIEST PLZ HELPPPPIn your own words, describe the process of a physical change.

Chemistry

1 answer:

ryzh [129]3 years ago

3 0

Answer:

Explanation:

Physical changes changes when objects or substances undergo a change that does not change their chemical composition.

You might be interested in

Procaine hydrochloride (MW = 273) is a 2-ion electrolyte, dissociating 80%. Calculate its dissociation factor. Round to tenths p

Inga [223]

Answer:

Dissociation factor = 1.8

Explanation:

Data provided in the question:

Molecular weight of the Procaine hydrochloride = 273

Number of ions contained, n = 2

Fraction Dissociating, α = 80% = 0.8

Now,

the dissociation factor 'i' is given as:

i = 1 + α × ( n - 1 )

on substituting the respective values, we get

i = 1 + 0.8 × ( 2 - 1 )

i = 1 + ( 0.8 × 1 )

i = 1.8

4 0

4 years ago

Breathing air that contains 4.0% by volume CO2 over time causes rapid breathing, throbbing headache, and nausea, among other sym

7nadin3 [17]

Answer:

1 mole of any ideal gas occupies the same volume as one mole of any other ideal gas under the same conditions of temperature and pressure.So 1 L CO2 has same number of moles as 1 L O2 and 1 L N2 etc.This means that, assuming all the gases in air are ideal gases, if CO2 is 4.0 % by volume then it is also 4.0 % by moles, because a volume of each gas has the same number of moles.

Explanation:

3 0

3 years ago

Dissolving a solute such as koh in a solvent such as water results in

andreev551 [17]

Answer;
A decrease in the vapor pressure of the liquid.

Dissolving a solute such as potassium hydroxide in a solvent such as water results in a decrease in the vapor pressure of the liquid.

Explanation;
The vapor pressure of a liquid is the equilibrium of a vapor above its liquid.
In other words it is the pressure of the vapor resulting from the evaporation of a liquid above a given sample of the liquid in a closed container.
The vapor pressure of a liquid in a closed container depends on the temperature.

4 0

3 years ago

Read 2 more answers

~Hey guys, can somebody answer this for me, thanks :) ~

NISA [10]

I think it's 11.56 minutes

3 0

3 years ago

A certain solution of methylamine has a pOH of 6.8, while a solution of pyridine has a pOH of 6.0. Which solution has a greater

Liono4ka [1.6K]

Answer:

Pyridine solution has a greater concentration of hydroxide ions.

Explanation:

The pOH of the solution is defined as negative logarithm of hydroxide ion concentration in a solution.

$pOH=-\log [OH^-]$

Higher the value of pOH lessor will be the hydroxide ion concentration and higher the concentration of hydrogen ions in the solution .
Lower the value of pOH higher will be the hydroxide ion concentration and lower the concentration of hydrogen ions in the solution.

1) The pOH of the methylamine = 6.8

$6.8=-\log[OH^-]$

$[OH^-]=1.5848\times 10^{-7} M$

2) The pOH of the pyridine = 6.0

$6.0=-\log[OH^-]$

$[OH^-]=0.000001 M=1.0\times 10^{-6} M$

Pyridine solution has a greater concentration of hydroxide ions than the solution of methylamine.

8 0

4 years ago