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Liula [17]
3 years ago
7

Explain how the chromatography shows that all three samples have at least one substance common✨ ​

Chemistry
1 answer:
Alinara [238K]3 years ago
3 0
Monkey is good and that is all their it to it
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What is the symbol for the isotope of 58co that possesses 33 neutrons?
Cerrena [4.2K]

Cobalt because it has an atomic mass of 58 and 33 neutrons.

3 0
3 years ago
A gas cylinder contains 2.0 mol of gas X and 6.0 mol of gas Y at a total pressure of 2.1 atm. What is the partial pressure of ga
liubo4ka [24]
1) mol fraction of gas X= 2/(6+2)=2/8=1/4
2) mol fraction of gas Y= 6/(6+2)=6/8=3/4
3) Partial pressure of X = 1/4*2.1 atm=0.53 atm
4) Partial pressure of Y = 3/4*2.1=1.6 atm
6 0
3 years ago
Read 2 more answers
In acid rain, nitrogen oxides and sulfur oxides from emissions cause a change in the normal pH level. Which of the following is
kow [346]

The pH levels of acid rain are very acidic; in the range of 2.0-3.0, is not true for acid rain.

Answer: D

Explanation

Acid rain is termed for the rain which contains acidic precipitations.

The precipitations of acids are generally made up of sulfuring and nitric acid.

The sulfuric and nitric acids were formed by the chemical reaction occurring between the water, oxygen and other chemicals present in the atmosphere with the sulfur-di-oxide and nitrous oxide emitted in the atmosphere due to burning of natural resources, fossil fuels, etc.

The chemical reaction of these oxides with water, oxygen and other chemicals leads to formation of acids.

Some of the oxides are emitted from burning of natural resources while the major emissions occur from burning of fossil fuels.

Also the oxides react in atmosphere to form acids.

So the options (A),(B) and (C) are true for acid rain.

But the option (D) is not true as the acid rain is not much acidic in nature, as it is getting dissolved in water so the range of acidity is 4.2-4.4 and not 2.0-3.0.

7 0
3 years ago
Nearly every compound of silicon has the element in the ⁺4 oxidation state. In contrast, most compounds of lead have the element
baherus [9]

Boron shows analogous behaviour with silicon. Every compound of Boron have +3 oxidation state, while as we go down the the oxidation state become +1 and +3. For example, gallium, indium, etc.

Similarly, every compound of silicon has the element in the ⁺4 oxidation state. In contrast, most compounds of lead have the element in the ⁺2 state because of inert pair effect.

<h3>What is Inert pair effect? </h3>

The inert-pair effect is defined as the tendency of two electrons in the outermost atomic s-orbital almost remain unshared in the compounds of the post-transition metals.

<h3>How we calculate Oxidation state? </h3>
  • Each atom in an element either be in its uncombined or free state has oxidation number of zero. Such as each atom in H₂, Cl₂ , P4, ,O₂ , Na, Al, O3, S8, and Mg, all have an oxidation number zero.
  • The oxidation state of ions that comprise of only one atom is the actual charge on the ion.
  • The oxidation state of hydrogen is +1, excluding when it is bonded to metals having two elements. For example, CaH2, its oxidation state is –1.
  • Fluorine and other halogens have an oxidation state equal to –1 when they appear as a form of halide ions in their compounds.

Since the inert pair effect increases as we go down the group and become more predominant, therefore, the stability of +2 oxidation state goes on increasing down the group. Therefore, gallium, indium are mostly found in +1 oxidation state.

Thus, we concluded that Boron shows analogous behaviour with silicon. Every compound of Boron have +3 oxidation state, while as we go down the the oxidation state become +1 and +3. For example, gallium, indium, etc.

learn more about oxidation state:

brainly.com/question/25551544

#SPJ4

4 0
2 years ago
The heat capacity of water is 1cal degree'g1 (1 calorie per degree centigrade, per gram). You are given 1 gallon of water at 25
sdas [7]

Answer:

The heat needed to boil 1 gallon of water is 81,490.62 Joules.

Explanation:

Q=mc\Delta T

Where:

Q = heat absorbed or heat lost

c = specific heat of substance

m = Mass of the substance  

ΔT = change in temperature of the substance

We have :

Volume of water = V = 1 gal = 4546.09 mL

Density of water , d= 1 g/mL

mass of water = m = d × V = 1g/mL × 4546.09 mL =  4546.09 g

Specific heat of water = c = 1 Cal/g°C

ΔT = 100°C - 25°C = 75 °C

9 (boiling pint of water is 100°C)

Heat absorbed by the water to make it boil:

Q= 4546.09 g\times 1 Cal/g^oC\times 75^oC=340,956.75 Cal

1 calorie = 4.184 J

Q=\frac{340,956.75}{4.184} J = 81,490.62 J

The heat needed to boil 1 gallon of water is 81,490.62 Joules.

5 0
3 years ago
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