Answer:
gains two electron!
Explanation:
When a barium atom forms its most common ion, it gains two electron!
Answer:
B is False
Explanation:
In physical chemistry we always look from system's perspective, so if we heat something ΔH is positive and if the system gives heat out then ΔH is negative.
A. We have to give energy to benzene to evaporate it. Statement true.
B. If heat is absorbed then the enthalpy must be positive.
C. The heat is absorbed then ΔH is positive.
D. Usually for burning heat is exposed from system. So enthalpy is negative.
E. Obvious
Delivering electricity to homes through high voltage lines, reduces the power loss that is caused by Joule's heating.
We know that:
P=VI
Where, P is power, V is the voltage and I is the current.
So if we keep P constant and make then voltage up, I must goes down.
According to Joule's first law : Power of heating generated by a conductor is directly proportional to the product of its resistance and the square of the current.
Now using the equation:
Q=I²Rt
Where Q is the heat generated, I is the current , R is the resistance and t is the time.
So by reduced I, heat loss will be reduced.
ANSWER : G. Herbivores and carnivore
EXPLANATION : Because they feed off plants crops and small animals
