Answer: fluorine is a molecular element
Explanation:Molecular element is a molecular substance consisting of a single element
Answer:
from
H=mc∆T
where by;
H is amount of heat.
m is mass of water.
c is specific heat of water.
∆T is change in temperature.
m=density ×volume
m=1.00g/ml×45.7ml
m=45.7g
∆T=Tt-T°
∆T=41.3°C-23.6°C
∆T=17.7°C
H=45.7g×4.184j(g•°C)×17.7°C
H=3,384.396J
H=3,384.396÷1000
H=3.384kJ
Explanation:
H=mc∆T
where by;
H is amount of heat.
m is mass of water.
c is specific heat of water.
∆T is change in temperature
Answer:
Melting is an example of physical change.
Explanation:
Answer:
A voltaic cell
Explanation:
A voltaic cell is a device which converts chemical energy to electrical energy. The chemical reactions that take place inside the cell causes electrons to flow from anode to cathode hence, electricity is produced. A simple voltaic cell is made by placing two different metals in contact with an electrolyte separated by a salt bridge. The cathode is the negative electrode while the anode is the positive electrode. It is also called a galvanic cell.
In a voltaic cell having a copper/copper solution half cell, reduction occurs at the cathode. Hence, at the cathode copper II ions accept two electrons and become reduced to ordinary metallic copper. This causes the blue colour of the solution to become discharged (fade) as the cell continues to function.