2 years ago

Escribe 4 unidades de temperatura

Chemistry

1 answer:

olchik [2.2K]2 years ago

3 0

Answer:

esta nublado

Explanation:

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Atoms of different elements have a different mass and volume. Why is the statement true?

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Answer:different elements have different number of electrons and shells/orbits thatswhy it have different atomic mass and size.

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3 years ago

A large pot (10 kg) of beef stew is left out on the kitchen counter to cool. The rate of cooling, in kJ/min, equals 1.955 (T-25)

olga_2 [115]

Answer:

16 minutes

Explanation:

First, we need to calculate the amount of heat needed to cool the beef stew:

Q = mcΔT

Where m is the mass, c is the heat capacity and ΔT is the variation of the temperature.

Q = 10x4x(40 - 90)

Q = -2000 kJ

So, the beef stew needs to lost 2000 kJ to cool.

With the initial temperature at 90ºC, the rate of cooling(r) will be:

r = 1.955x(90 - 25)

r = 127.075 kJ/min

So, to lose 2000 kJ, will be necessary:

t = Q/r

t = 2000/127.075

t = 16 minutes

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3 years ago

If I have 20g of Sodium, how many moles of Sodium Oxide (Na2O) can be made?

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Mass:20g

Mole=20/[2(23)+16]
=0.32 mil

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3 years ago

Which method is the typical first step when scientists communicate their scientific results?

hodyreva [135]

Purpose
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calculation
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3 years ago

Read 2 more answers

Scintillatium has a halflife of 16 minutes. if a sample has 800 grams, find a formula for its mass after t minutes.

hichkok12 [17]

Halflife is the time needed for a radioactive molecule to decay half of its current mass. If t is the time elapsed, the formula for the halflife would be:
final mass= original mass * $\frac{1}{2} ^{\frac{t}{halflife}$

If you put the information of the problem into the formula, the equation will be:
final mass= original mass * $\frac{1}{2} ^{\frac{t}{halflife}$
final mass= 800g * $\frac{1}{2} ^{\frac{t}{16 min}$

8 0

3 years ago