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babunello [35]
3 years ago
9

Name two useful materials obtained from fractional distillation of petroleum

Chemistry
1 answer:
d1i1m1o1n [39]3 years ago
7 0

Answer: Petroleum or Natural gas and Kerosine

Explanation:

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Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells?
Sophie [7]

Answer:

Gamma rays

Since they have high penetrating power.

8 0
2 years ago
Increasing the temperature increases the vaporization rate of a liquid because the excess energy is used to break covalent bonds
igor_vitrenko [27]

Answer:

False

Explanation:

False.  The molecules of liquid are hold in the liquid state due to intermolecular forces or Van de Waals forces , without affecting the molecule itself and its atomic bonds (covalent bonds).  When the temperature increases the kinetic energy of the molecules is higher , therefore they have more possibilities to escape from the attractive intermolecular forces and go to the gas state.

Note however that this is caused because the intermolecular forces are really weak compared to covalent bonds, therefore is easier to break the first one first and go to the gas state before any covalent bond breaks ( if it happens).

A temperature increase can increase vaporisation rate if any reaction is triggered that decomposes the liquid into more volatile compounds , but nevertheless, this effect is generally insignificant compared with the effect that temperature has in vaporisation due to Van der Waals forces.

4 0
3 years ago
What is the molecular formula of first 20 elements​
attashe74 [19]

Answer:

H

He

Li

Be

B

C

N

O

F

Ne

Na

Mg

Al

Si

P

S

Cl

Ar

K

Ca

3 0
3 years ago
The phase change in which a substance changes from a liquid to a solid is A. freezing. B. melting. C. sublimation. D. condensati
vovangra [49]

freezing. Think of what happens when you put water in the freezer

4 0
3 years ago
What evidence supports a conservation law?
True [87]

Answer:

The answer is B.

Explanation:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.

According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.

3 0
3 years ago
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