CHEMISTRY HIGH SCHOOL

During the operation of a voltaic cell, the cell produces1) electrical energy spontaneously
2) chemical energy spontaneously
3) electrical energy nonspontaneously
4) chemical energy nonspontaneously

I need some help with this one ?

Answers

Answer 1
Answer: The answer is 1) electrical energy spontaneously

A voltaic cell is an electrochemical cell driven by a spontaneous chemical reaction and produces an electrical energy. The general form of reaction is
                     reagents → products + electrical energy.
This reaction is spontaneous.

However, the reverse reaction is nonspontaneous and it requires electrical energy.

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Answers

Answer:

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A 10.35g piece of copper metal was heated to 85.5 degrees C and then placed into 23.6g of water. the initial temperate of the water was 18.3 degrees C. what was the final temperature?

Answers

Answer:

T_F=20.91^(\circ)C

Explanation:

For this problem we have to start with the heat equation:

Q=mCpΔT

In which the delta symbol is:

ΔT=T_f_i_n_a_l-T_i_n_i_t_i_a_l

All the heat from copper would be transfer into the water, so:

Q_m_e_t_a_l=-~Q_w_a_t_e_r

Now, we can identify the variables:

m~_C_u=10.35~g

m~_H_2_O=23.6~g

T_i~_C_u=85.5^(\circ)C

T_i~H_2O=18.3^(\circ)C

Cp~_C_u~=0.385(J)/(g^(\circ)C)

Cp~_H_2_O~=4.184(J)/(g^(\circ)C)

When we put all together in the equation we will have:

(10.35~g)*(0.385(J)/(g^(\circ)C))*(T_F-85.5^(\circ)C)=-(23.6~g)*(4.184(J)/(g^(\circ)C))*(T_F-18.3^(\circ)C)

3.99~T_F-~340=-98.74~T_F+1806.99

3.99~T_F+~98.74~T_F=340+1806.99

102.72~T_F=2147.68

T_F=20.91^(\circ)C
We know that the heat that escapes the copper metal is equal to the heat that is added to the water bath.

Thus we can use the MC∆T formula to solve for the final temperature
We need to set up the formula for both the change in temperature of the copper as well as the water
thus
Mass(Cu) * Specific Heat capacity(Cu) * (Final temp - initial temp)(Cu) = 
Mass(H2O) * Specific Heat of Water(H2O) * (Final - initial temp)(H2O)

Now we can substitute the given info. 
specific heat of copper = 0.386 and water is 4.184
10.35g * 0.386 * (x - 85.5) = 23.6g * 4.184 * (x - 18.3)
Now You just need to solve for X. Also remember to take the absolute value of the left side as it will become negative but really the change in heat or ∆H is equal

A material is ductile, conducts electricity, and is magnetic. The material is a _____. metal nonmetal metalloid impossible to tell

Answers

The answer is metal. Metals are substances generally considered to be good conductors of electricity. They are also considered to be ductile and malleable which means they can be bent or stretched into think wires without breaking. Lastly, some metals like iron, cobalt, and nickel are strongly magnetic. 

the answer your looking for is metal
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