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geniusboy [140]
3 years ago
8

Give an example of a purely physical change and an example of a chemical change

Chemistry
1 answer:
vampirchik [111]3 years ago
4 0
Physical change- crunching up paper
Chemical change- burning paper
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How many atoms are in 8 gram of helium
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Name the phase change in each of these events: (a) A diamond film forms on a surface from gaseous carbon atoms in a vacuum.
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The phase shift in the events is called deposition.

In a vacuum, carbon atoms in gas form a diamond coating on a surface. The conversion of gas phase to solid phase is a part of the described process. As a result, this procedure is known as deposition.

A deposition is a process by which a solid substance is formed from a gaseous one. Bypassing the transitional liquid state, a gaseous substance is deposited in its place (often as crystals). Deposition happens, for instance, when airborne water vapor quickly freezes into ice, as when frost develops.

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Whether the eroding agent is gravity, ice, water, waves, or wind, deposition happens when it runs out of energy and can no longer support the burden of the degraded material. Gravity or, in the case of wind, the Sun, provides the energy that the erosion agents can use.

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4 0
1 year ago
Colors of light with shorter wavelengths - A: have less energy than colors with longer wavelengths Strike Reset B: have more ene
dezoksy [38]

Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

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3 years ago
When 100ml of M HCl is mixed with 100ml of N NaOH, the pH of the resulting solution is
RoseWind [281]

Answer:

Option d. 7

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A mixture of a strong base and a strong acid produce a neutral salt and water.

This is the reaction of neutralization:

HCl + NaOH → NaCl + H₂O

NaCl →  Na⁺  +  Cl⁻

Sodium chloride is neutral salt which does not give H⁻ neither OH⁻ to medium, that's why pH is neutral.

Both ions are derivated from a strong acid and base so they do not make hydrolisis. They are a conjugate pair of a weak acid and base. The reactions can not occur:

Cl⁻  +  H₂O ← OH⁻  +  HCl

Na⁺  +  H₃O⁺ ← NaOH  + H₂O

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3 years ago
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