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Novay_Z [31]
3 years ago
13

An electron is in a region outside the nucleus

Chemistry
1 answer:
harkovskaia [24]3 years ago
3 0
Is that a question? Doesnt seem like it
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Plz help, have a quiz on this plz PLZ
katovenus [111]

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20.82

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Easy questions ha chemistry
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B

A

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How would the kinetic energy of the rider change if his mass were doubled?
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n unknown metal is either aluminum, iron or lead. If 150. g of this metal at 150.0 °C was placed in a calorimeter that contains
Nitella [24]

Answer : The metal used was iron (the specific heat capacity is 0.449J/g^oC).

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

q_1=-q_2

m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)

where,

c_1 = specific heat of unknown metal = ?

c_2 = specific heat of water = 4.184J/g^oC

m_1 = mass of unknown metal = 150 g

m_2 = mass of water = 200 g

T_f = final temperature of water = 34.3^oC

T_1 = initial temperature of unknown metal = 150.0^oC

T_2 = initial temperature of water = 25.0^oC

Now put all the given values in the above formula, we get

150g\times c_1\times (34.3-150.0)^oC=-200g\times 4.184J/g^oC\times (34.3-25.0)^oC

c_1=0.449J/g^oC

Form the value of specific heat of unknown metal, we conclude that the metal used in this was iron (Fe).

Therefore, the metal used was iron (the specific heat capacity is 0.449J/g^oC).

6 0
3 years ago
You observe an unknown substance under a microscope. You notice that the molecules are tightly packed together and not moving. B
enot [183]

Answer:

The answer would be A because they are tightly packed.

8 0
2 years ago
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