Which substance was developed by chemists

2 answers:

4 0

Silk is made by moth larvae, asprin is derived from tree bark, nylon was made initially in a labratory, but asprin and even synthetic silk can be produced by chemist.

GalinKa [24]3 years ago

4 0

Silk is made by moth larvae, aspirin is derived from tree bark, nylon was made initially in a laboratory, but aspirin and even synthetic silk can be produced by chemists. Of the three, only nylon has no naturally occur source.

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149.3 g of H2O at 95 ◦C is poured over 412 g Fe at 5 ◦C in an insulated vessel. What is the final temperature? The specific heat

abruzzese [7]

You are correct, but you needn't worry about the signs so much. Just remember that the negative sign is used to denote a loss of energy; since the water is hotter, it will be losing energy (-Q) and the iron will gain energy (Q). Now, we substitute the values:
-149.3 * 4.184 * (T - 95) = 412 * 0.44 * (T - 5)
Solving this equation for T,
T = 74.8 °C

6 0

3 years ago

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kupik [55]

Answer:

1.55

Explanation:

-log(M)=pH

- Hope that helps! Please let me know if you need further explanation.

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MrRa [10]

Answer:

Explanation:

Rivers may be contaminated by sewage.

I do hope I helped you! :)

6 0

3 years ago

Which list contains all pure substance

Viktor [21]

The periodic table contains the pure substances

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3 years ago

What is the frequency of radiation which has a wavelength of 7.00 x 10⁻⁵cm? In what region of the electromagnetic spectrum is th

Novosadov [1.4K]

Answer:Frequency (hz) is some sort of vibration occurs during a particular period of time as either in a sound waves or in an electromagnetic field. Given below an online frequency of light with wavelength calculator to convert from wavelength to hz. Wavelength (λ) is the distance between two waves of energy traveling from one point to another point.

Explanation:

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3 years ago