Answer:
atomic mass; mass number
1) NO ; YES
2) YES ; YES
3) YES ; YES
4) YES ; NO
5) NO; YES
Explanation:
An atomic mass is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons.
And also 1 atomic mass unit is defined as 
of the mass of a single carbon-12 atom.
Now, mass number of an element is the sum of protons and neutrons present in a single atom of that element.
Mass of the electrons is 9.10938356 × 10⁻³¹ kilograms
which is negligible.
And mass of proton and neutron is nearly but not exactly 1 u.
so, mass number is nearly but not exactly equal to atomic mass ,most of the times.
so,
1) only mass number can be used to calculate number neutrons present by simple subtracting atomic number(proton number) in mass number
2) both of these are found in periodic table
3) both can be found for individual atoms
4) mass number are different for isotopes but the atomic mass is calculated considering the isotopes(depends on availability of isotopes)
5)only mass number is given in isotopic symbol.
Answer: increasing the number of collisions between reactants
Explanation:
A reaction is possible due to collisions between the reactants to create products. If we increase the concentration of reactants then that means that we are increasing the molecules of the reactants which would give them more chances to collide and make products.
For instance, using a non-chemistry example, if there are few cars in a large city, the accidents there will be less because the cars will have such space that they wouldn't collide with each other. If the number of cars in the city is increased however, there is now less space and more chances for cars to collide.
Answer: 8.7 grams
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 
of particles.
To calculate the moles, we use the equation:
As oxygen is in excess, Aluminium is the limiting reagent and limits the formation of products.
According to stoichiometry:
4 moles of aluminium give = 2 moles of 
Thus 0.17 moles of aluminium give=
Mass of 
Thus the mass of is 8.7 grams
The hydrocarbon name that adheres
correctly to the IUPAC naming system is 3-ethyl-2,4-dimethylhexane.
To add, <span>in chemical </span>nomenclature, the IUPAC nomenclatureof organic chemistry is a systematic method ofnaming<span> organic chemical compounds as recommended by the
International Union of Pure and Applied Chemistry (</span>IUPAC).
Answer:
A is the only neutral atom there.
Explanation:
It consists of 6 atoms 6 neutrons and 6 electrons which means it is neutral. I am currently in chemistry.
