3 years ago

Is Chromium (Cr) a synthetic or natural element?

Chemistry

1 answer:

algol [13]3 years ago

4 0

It's a natural element because it appears on earth

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protect it by covering it by lyophilic sol.

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2 years ago

When 2 crystalline solid barium hydroxide octahydrate and crystalline solid ammonium nitrate are mixed in a beaker at room tempe

podryga [215]

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3 years ago

Consider the nuclear equation below.

Dovator [93]

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A sample of octane burns releasing 2290 J of heat to the surroundings, and the gases produced expands against a piston to do 560

dexar [7]

Answer: The internal energy change for the reaction is -2850 J

Explanation:

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

Sign convention of work:

Work done for expansion process is taken as negative and work done for compression is taken as positive.

According to the First law of thermodynamics,

$\Delta U=q+w$

where,

$\Delta U$ = internal energy

q = heat absorbed or released = -2290 J

w = work done = -560 J

Putting values in above equation, we get:

$\Delta U=(-2290)+(-560)\\\\\Delta U=-2850J$

Hence, the internal energy change for the reaction is -2850 J

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3 years ago

What are the colors of metal

madreJ [45]

Answer:

brown and silver

Explanation:

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3 years ago