C.) [Ar] 4s23d104p2
i just took the quiz and this was the correct answer :-)
Answer: A Bronsted-Lowry acid is defined as a substance that acts as a proton donor.
Explanation:
A substance that is able to donate a proton or hydrogen ion to another substance is a Bronsted-Lowry acid.
For example, HCl is a Bronsted-Lowry acid as it dissociates to give a hydrogen ion.

Thus, we can conclude that a Bronsted-Lowry acid is defined as a substance that acts as a proton donor.
Mass/volume
In order to find density, you need to divide mass/volume
Answer : The mathematical equation used when solving calorimetry problems is:

Explanation :
Calorimetry : It is determining the changes in the energy of a system by measuring the heat transferred with surroundings.
Formula used :

where,
c = specific heat capacity of calorimeter
m = mass of a substance
q = heat required
= change in temperature of substance
Corroding iron. The reason why iron corrodes is that it reacts with the oxygen in the air to create iron oxide which is what we call rust. when iron turns to rust, the chemical identity of the iron changes.
when you break ice, the ice is still ice. that water did not change into something else. when you run a current through copper, the electrons in the copper move due to the voltage but the copper is not changing. After the circuit stops, the copper wires are still made out of copper (the copper did not undergo a chemical change). When you melt gold, the gold is only going from solid form to liquid form. The gold has not changed chemically, it just underwent a phase change.
I hope this helps. Let me know if anything is unclear.