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pychu [463]
3 years ago
10

- How much power does it take to lift a 1,000 N load 10 m in 20 s?

Chemistry
1 answer:
Mariana [72]3 years ago
5 0

Answer:

"500 Joule/sec" is the right answer.

Explanation:

The given values are:

Force,

F = 1000 N

Velocity,

s = 10 m

Time,

t = 20 s

Now,

The power will be:

=  \frac{Force\times Velocity}{Time}

On putting the values, we get

=  \frac{1000\times 10}{20}

=  \frac{10000}{20}

=  500 \ Joule/sec

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How many joules of heat is lost when a 64 g piece of copper cools from 375 oC to 26 oC? The specific heat of copper is 0.38 J/go
Svetlanka [38]

Answer: 8500 J lost or -8500 J

Explanation:

q=cmt

t=375-26

t=349

q=0.38(64)(349)

q=8487.68 J

Answer must have 2 sig figs, which means it rounds to 8500 J.

7 0
3 years ago
Elemental iodine (I 2) is a solid at room temperature. What is the major attractive force that exists among different I 2 molecu
Ulleksa [173]

Explanation:

As I_{2} is a covalent compound because it is made up by the combination of two non-metal atoms. Atomic number of an iodine atom is 53 and it contains 7 valence electrons as it belongs to group 17 of the periodic table.

Therefore, sharing of electrons will take place when two iodine atoms chemically combine with each other leading to the formation of a covalent bonding.

Hence, weak forces like london dispersion forces will be present between a molecule of I_{2}.

The weak intermolecular forces which can arise either between nucleus and electrons or between electron-electron are known as dispersion forces. These forces are also known as London dispersion forces and these are temporary in nature.

thus, we can conclude that london dispersion force is the major attractive force that exists among different I_{2} molecules in the solid.

7 0
3 years ago
What are in the energy levels that surround the nucleus of an atom?
sasho [114]
Electrons are the thing in the outer energy levels
4 0
3 years ago
If an element has 9 electrons, how many of them will be in the 2nd energy level?
faust18 [17]
Your answer would come out to 18 electrons 
5 0
3 years ago
How many molecules are there in 6.73 moles of phosphorus trichloride? (write your answer in scientific notation).
anyanavicka [17]

Answer: There are 4.05\times 10^{24}  molecules in 6.73 moles of phosphorus trichloride

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

1 mole of PCl_3 contains = 6.023\times 10^{23}  molecules

Thus 6.73 moles of PCl_3 contains = \frac{6.023\times 10^{23}}{1}\times 6.73=4.05\times 10^{24}  molecules

Thus there are 4.05\times 10^{24}  molecules in 6.73 moles of phosphorus trichloride

3 0
3 years ago
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