Fuel cells have been developed that can generate a large amount of energy. for example, a hydrogen fuel cell works by combining hydrogen and oxygen gas to produce water and electrical energy. if a fuel cell can generate 10.0 kilowatts of power and the current is 15.8 amps, what is the voltage of the electricity?
a.0.63 volts
b.158volts
c.633 volts
d.158,000 volts
e.5.8 volts

633 V

Explanation:

According to the Watt´s law, the power generated by an electronic, is directly proportional to the voltage and the current applied. So we can expressed this relation as:

P=V*I

Where P is power in (W), V is the voltage in (V) and I is the current in (A)

Solving the equation for Voltage

V=P/I

V=(10000 W)/15.8 A

V= 633 V

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

increased stability in the completion of fluorine's outer shell.