Answer:
All samples of a given chemical compound will be composed of the same elements in the same proportion.
Explanation:
The law of constant composition or definite proportions states that "all pure samples of the same chemical compound contain the same proportions of the elements by mass". For example, every time water H₂O forms, it would always have the same proportion of hydrogen and oxygen.
“A” white blood cells. They are the first line of defense against pathogens. They help protect your body and help the pathogens to not spread.
I hope this helps!
~kaikers
Answer:
8.9x10¹⁷ atoms of Al are present
Explanation:
To find the number of atoms from the mass of an atom we must convert, as first, the mass to moles using the molar mass of the atom (26.98g/mol For Aluminium).
Then, we must convert the moles to atoms knowing that 1mol = 6.022x10²³ atoms.
<em>Moles Aluminium:</em>
4.0x10⁻⁵g * (1mol / 26.98g) = 1.483x10⁻⁶ moles Al
<em>atoms:</em>
1.483x10⁻⁶ moles Al * (6.022x10²³ atoms / mol) =
<h3>8.9x10¹⁷ atoms of Al are present</h3>
Question 12 is Noble gas and question 13 is actinide-series element.
Answer:
nuetrons
Explanation:
some helium atoms just a little thick and packing extra neutrons