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stealth61 [152]
2 years ago
9

What is a scanning tunneling microscope?

Chemistry
1 answer:
Crank2 years ago
7 0
A. Used for imaging surfaces at atomic level
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A reaction has activation energy of 85kjper mol. What is the effect on the rate of raising the temperature from 20degree to 30 d
DENIUS [597]

Answer: The rate increases 3 times on raising the temperature from 20degree to 30 degree​

Explanation:

According to Arrhenius equation with change in temperature, the formula is as follows.

ln \frac{k_{2}}{k_{1}} = \frac{-E_{a}}{R}[\frac{1}{T_{2}} - \frac{1}{T_{1}}]

where k_2 = rate constant at temp T_2

k_1 = rate constant at temp T_1

E_a= activation energy

R= gas constant

T_1= temperature = 20^0C=(20+273)K=293K

T_2= temperature = 30^0C=(30+273)K=303K

ln \frac{k_{2}}{k_{1}} = \frac{-85\times 1000J/mol}{8.314J/Kmol}[\frac{1}{303} - \frac{1}{293}]

ln \frac{k_{2}}{k_{1}}=1.15

\frac{k_{2}}{k_{1}}=3

Thus rate increases 3 times on raising the temperature from 20degree to 30 degree​

3 0
3 years ago
If you push on a wall with 200n with what forth with the wall push back
sweet-ann [11.9K]
According to newtons law every action has a equal reaction therefore it will push back 200n aswell
4 0
3 years ago
An alpha particle is equivalent to a _____ nucleus.
Allushta [10]
An alp-ha particle is equivalent to the nucleus of a helium atom. Helium Atom = Answer.
8 0
3 years ago
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What are glaze defects or flaws​
Gnesinka [82]
Glaze defects are any flaws in the surface quality of a ceramic glaze,it’s physical structure or its interaction with the body.
3 0
3 years ago
Is copper II chloride mixed with water an element, compound, or mixture? If it's a mixture is it homogeneous or heterogeneous?
Fittoniya [83]

Answer:

1. mixture

2. Homogenous

Explanation:

Copper II chloride is a compound because it consists of elements that are chemically combined together. When a solute in this case, copper II chloride is mixed with water- a solvent, the result is a homogenous mixture.

Homogenous substances are formed when a solute and a solvent combine, resulting in a mixture with uniform properties. Mixtures can be separated using relevant separation techniques.

7 0
3 years ago
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