AQA A-level Chemistry Topic 1
- Exam QUESTIONS AND
VERIFIED CORRECT
ANSWERS GRADED A+
LATEST 100% GUARANTEED
PASS
Calculate the relative atomic mass...
Explain why the value you have calculated is slightly different from the relative atomic mass
given in the periodic table. - CORRECT ANSWER-The Ar in the periodic table takes into account
the other isotopes.
State why isotopes of an element have the same chemical properties - CORRECT ANSWER-same
number of electrons in the outer shell
State one reason why particles with the same mass and velocity can be deflected by different
amounts in the same magnetic field. - CORRECT ANSWER-different charges
Explain how the detector in a mass spectrometer enables the abundance of an isotope to be
measured. - CORRECT ANSWER-- ions hit the detector and cause a current to flow
- bigger current = higher abundance
, State and explain the trend in atomic radius of the period 3 elements from sodium to chlorine. -
CORRECT ANSWER-- atomic radius decreases
- Increasing nuclear charge
- same shielding
Explain why sodium has a lower melting point than magnesium. - CORRECT ANSWER-- sodium
has fewer protons
- smaller attraction between nucleus and delocalised electrons
Explain why the second ionisation energy of magnesium is greater than the first ionisation
energy of magnesium. - CORRECT ANSWER-- an electron is being removed from a positive ion
State one change in the operation of the mass spectrometer that will change the path of an ion.
- CORRECT ANSWER-Electromagnet
How does atomic radius change from top to bottom in a group in the periodic table? - CORRECT
ANSWER-Atomic radius increases going down a group.
How does atomic radius change from left to right across a period in the periodic table? -
CORRECT ANSWER-Atomic radius decreases across a period as there are more protons.
Why is sulfur placed in the p block in the periodic table?
(electron conf. = 1s2 2s2 2p6 3s2 3p4) - CORRECT ANSWER-outer electron is in the 3p orbital
State in terms of fundamental particles why isotopes have similar chemical reactions. -
CORRECT ANSWER-same number of electrons in the outer shell
State and explain the general trend in the first ionisation energies of the Period 3 elements
sodium to chlorine. - CORRECT ANSWER-- first I.Es increase
- Exam QUESTIONS AND
VERIFIED CORRECT
ANSWERS GRADED A+
LATEST 100% GUARANTEED
PASS
Calculate the relative atomic mass...
Explain why the value you have calculated is slightly different from the relative atomic mass
given in the periodic table. - CORRECT ANSWER-The Ar in the periodic table takes into account
the other isotopes.
State why isotopes of an element have the same chemical properties - CORRECT ANSWER-same
number of electrons in the outer shell
State one reason why particles with the same mass and velocity can be deflected by different
amounts in the same magnetic field. - CORRECT ANSWER-different charges
Explain how the detector in a mass spectrometer enables the abundance of an isotope to be
measured. - CORRECT ANSWER-- ions hit the detector and cause a current to flow
- bigger current = higher abundance
, State and explain the trend in atomic radius of the period 3 elements from sodium to chlorine. -
CORRECT ANSWER-- atomic radius decreases
- Increasing nuclear charge
- same shielding
Explain why sodium has a lower melting point than magnesium. - CORRECT ANSWER-- sodium
has fewer protons
- smaller attraction between nucleus and delocalised electrons
Explain why the second ionisation energy of magnesium is greater than the first ionisation
energy of magnesium. - CORRECT ANSWER-- an electron is being removed from a positive ion
State one change in the operation of the mass spectrometer that will change the path of an ion.
- CORRECT ANSWER-Electromagnet
How does atomic radius change from top to bottom in a group in the periodic table? - CORRECT
ANSWER-Atomic radius increases going down a group.
How does atomic radius change from left to right across a period in the periodic table? -
CORRECT ANSWER-Atomic radius decreases across a period as there are more protons.
Why is sulfur placed in the p block in the periodic table?
(electron conf. = 1s2 2s2 2p6 3s2 3p4) - CORRECT ANSWER-outer electron is in the 3p orbital
State in terms of fundamental particles why isotopes have similar chemical reactions. -
CORRECT ANSWER-same number of electrons in the outer shell
State and explain the general trend in the first ionisation energies of the Period 3 elements
sodium to chlorine. - CORRECT ANSWER-- first I.Es increase
