Chemistry Concepts Flashcards

Front

Why do isotopes of the same element have identical chemical properties?

Back

Same number of electrons

Front

Why is graphite a good conductor but diamond is not?

Back

Graphite has delocalised electrons

Front

Why does reactivity increase down Group I?

Back

Outer electron is lost more easily due to shielding

Front

Why does reactivity decrease down Group VII?

Back

Outer shell further away, harder to gain electrons

Front

Why does ionic bonding result in high melting points?

Back

Strong electrostatic forces hold ions together

Front

Why does sodium float on water but calcium sinks?

Back

Sodium is less dense than water

Front

Why does aluminium resist corrosion?

Back

Forms protective oxide layer

Front

Why are noble gases unreactive?

Back

Full outer shells make them stable

Front

Why is electrolysis of molten ionic compounds possible but not of solids?

Back

Ions are free to move in molten state

Front

Why does increasing temperature increase reaction rate?

Back

More particles collide with energy above activation energy