Mass =70 ( Mass of protons=1 ,Mass of neutrons =1, Mass of electron =0.0005(can be ignored))
Therefore, 40 +30=70
Charge= -2 ( it is taking in/attracting electrons to its shell) base on the proton number you are able to identify if it is attracting or releasing an electron, if the electron number is more than proton number then it is attracting therefore resulting in a negative charge vice versa for releasing an electron.
Answer:
-100 kJ
Explanation:
We can solve this problem by applying the first law of thermodynamics, which states that:
where:
is the change in internal energy of a system
Q is the heat absorbed/released by the system (it is positive if absorbed by the system, negative if released by the system)
W is the work done by the system (it is positive if done by the system, negative if done on the system)
For the system in this problem we have:
W = +147 kJ is the work done by the system
Q = +47 kJ is the heat absorbed by the system
So , its change in internal energy is:
Chemical reactions. The number of electrons in an atom's outermost valence shell governs its bonding behavior. Therefore, elements whose atoms can have the same number of valance electrons are grouped together in the periodic table of the elements.
Answer:
D) Heat flows from the copper cube to the iron cube.
Step-by-step explanation:
The reason comes from the second law of thermodynamics:
Heat energy will flow spontaneously from an area of high temperature to one of low temperature.
When you bring two objects of different temperature into contact, heat energy always moves from the hotter to the cooler object.
The copper cube is hotter than the iron, so heat flows from the copper cube to the iron cube.
here hope this helps
