<u>The correct answers are </u>
- An atom of oxygen and the ion of oxygen both have 8 protons.
- As you add or remove neutrons from the nucleus, isotopes are formed.
Answer: Options A and D
<u>Explanation:</u>
An isotope of an element is formed by varying their number of neutrons and not on changing the number of electrons or protons. Similarly, an atom can be converted into an ion by adding or removing one or more electrons.
So the number of protons will not be changed for becoming an ion. Thus, the correct answers are that an atom of oxygen and ion of oxygen will be having 8 protons. Similarly, an isotope formation is possible on addition or removal of neutrons from the nucleus. All other options are not true as there will be no change in the number of electrons for isotope formation.
Answer:The process is known as sublimation
Explanation:
Sublimation is a process wherby solid substances are changed into gaseous state
The particles can move around each other because they do not have as strong bonds as solids do.
<span>This question relates to a common concept in Chemistry called "pressure volume work" which measures work done by gases when they compress or expand due to pressure. In equation form work = pressure x change in volume. In this situation work is expressed in L x ATM (atmosphere).
First we calculate the change in volume by subtracting final volume by initial volume. In this case the volume doubled so it is 2v-v which equals v (or 240l).
Next we convert bar to ATM. 1 bar is 100 kilopascale and 101.325 kilo pascals is 1 atmosphere, so in general 1 bar is usually considered to be 1 ATM. If we want to be very precise we would divide 100kilopasczle by 101kilopascalw per bar to get .987 ATM.
In this example we will use 1
So work = 1 ATM x 240l = 240 ATM x l</span>