Atoms, Molecules And Ions Flashcards
What is a molecule?
Atoms bonded together
What is the formula for hydrochloric acid?
HCl
What is the formula for sulphuric acid?
H2SO4
What is the formula for nitric acid?
HNO3
Where are protons found in an atom?
In the nucleus
Where are neutrons found in an atom?
In the nucleus
Where are electrons found in an atom?
In energy levels
What is the relative mass of a proton?
1
What is the relative mass of a neutron?
1
What is the relative mass of an electron?
1/2000
What is the relative charge of a proton?
+1
What is the relative charge of a neutron?
0
What is the relative charge of an electron?
-1
What is relative atomic mass?
How do you calculate the relative atomic mass?
The relative atomic mass is the weighted average mass of all the isotopes of an element
Relative mass = (Isotope mass x isotope abundance)/100
Copper consists of 69% copper-63 and 31% copper-65. What is the relative atomic mass of copper?
Relative atomic mass = (69 x 63) + (31 x 65) divided by 100 = 63.62
If you knew the atomic number of an unknown atom how would you find the symbol?
Count up to the atomic number on the periodic table
The electronic structure of silver is 2, 8, 9. What is the charge on a silver ion?
No. of protons: 19
No. of electrons: 18
(because the nearest noble gas structure is 2. 8. 8. Which is -1 from the electronic structure of a silver atom. 19 - 1 = 18)
No. of protons - no. of electrons = charge on ion
19 - 18 = 1
S(+1)
What is the charge on ions in group number 7?
-1
What I the charge on ions in group 2?
2+
Oxygen is in group 6 of the periodic table. There are 6 electrons in the outer shell of oxygen. What is the charge on oxygen?
2-
What are the 6 diatomic molecules?
Hydrogen H2 Oxygen O2 Clorine Cl2 Bromine Br2 Iodine I2 Nitrogen N2
What is the formula for ethanoic acid?
CH(3)CO(2)H
Symbol for oxygen atom?
Symbol for oxygen molecule?
Symbol for oxygen ion?
Atom: O
Molecule: O2
Ion: O(2+)
