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how many joules are needed to heat 20g of Cu from 10 to 50 degrees C?

q=309.6 J

Explanation:

Here we'll be using the formula of specific heat capacity: Q=mcΔT

Q= heat (joules)

m=mass (g)

c=specific heat capacity

ΔT= change in temperature > Final temp. - initial temp.

Let's plug in what we know and solve for q=heat.

q=(20)(0.387)(50-10)

q=(20)(0.387)(40)

q=309.6 joules

Depending on your teacher and the problem, they might want you to keep the temperature in C. Mine wanted them all in Kelvin, so if we were to convert it to Kelvin it would be:

273 + 40= 313 K

q=(20)(0.387)(313)

q=2422.6 J

1 a

2 d

3 a

4 c

explanation:

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: