Answer:
For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit. By adding together the number of protons and neutrons and multiplying by 1, you can calculate the mass of the atom.
Answer:
Chemical W is a pure substance
Explanation:
We can conclude that the substance W is a pure substance. Matter on a broad basis can be classified as either pure or distinct substance and impure substances (mixtures).
- Pure substances are elements and compounds.
- All the parts are homogenous.
- They have a definite composition.
- They cannot be split by physical means.
So, since we can only split the substance into elements X, Y and Z with no simpler units, W is a compound and a pure substance.
Answer:
particles bigger
Explanation:
Even when compared with animal cells, microorganisms become smaller. They are about 1/10 the size of a typical human cell. Therefore, compared with human-sized animal cells, the size of bacteria (such as bacterial cells) will be the size of a cat or puppy. The size of the virus is about 1/10 of that of other microorganisms such as bacteria.
Hope it helps. If not, I'm so sorry.
Answer: formula units
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:
1 mole of contains of formula units
Thus 0.203 mole of contains = of formula units