group 2 and group 7 so far

group 1 & 2 trends and reactions

Multiple Select

what is the correct explanation for the trend going down group 2 first ionisation energy? Pick all correct answers

• atomic radius increases so outer electrons are further from the nucleus

• nuclear charge decreases and shielding increases

• atomic radius decreases so electrons are gained more easily

• nuclear charge increases but so does shielding

Multiple Choice

which of the following correctly describes trends down group 2 compounds?

• hydroxide solubility increases and sulphate solubility decreases

• hydroxide solubility decreases and sulphate solubility increases

• hydroxide solubility decreases and sulphate solubility decreases

• hydroxide solubility increases and sulphate solubility increases

Multiple Choice

Which of the following substances are produced when lithium nitrate is heated?

• lithium nitrite, nitrogen dioxide & oxygen

• lithium nitrite & oxygen

• lithium oxide, nitrogen dioxide & oxygen

• lithium oxide & oxygen

Multiple Choice

Which of the following substances are produced when potassium nitrate is heated?

• potassium oxide & nitrogen dioxide

• potassium oxide & nitrogen dioxide & oxygen

• potassium nitrite & oxygen

Multiple Choice

What does thermal stability of group 1 & 2 carbonate and nitrates depend on?

• polarising power of the anion

• polarising power of the cation

Multiple Choice

what determines the polarising power of the cation?

• number of electrons

• charge of cation

• charge density

Multiple Choice

which group 2 nitrate would need the lowest temperature to decompose

• barium nitrate

• magnesium nitrate

• beryllium nitrate

• calcium nitrate

Multiple Choice

potassium carbonate & magnesium carbonate are both white solids. What happens when they are heated strongly?

• potassium carbonate decomposes but magnesium carbonate does not

• magnesium carbonate decomposes but potassium carbonate does not

• neither carbonate decomposes

• both carbonate decompose

Multiple Choice

Which substance, CaCo_3 or SrCo₃ needs a higher temperature to decompose?

• CaCo_3

• SrCo₃

Multiple Choice

Flame tests: which is the following flame colour for a barium compound?

• blue-green

• blue

• pale green

• white

Multiple Choice

Flame tests: which is the following flame colour for a lithium compound?

• crimson

• red

• yellow-red

• brick-red

Multiple Choice

group 1 chloride produce coloured flames when:

• the atoms lose outer electrons

• electrons are excited to higher energy levels

• electrons move from the chloride ions to metals ions

• excited electrons move from a higher to a lower energy level

Multiple Choice

Calcium reacts vigorously with water, producing effervescence and:

• a red flame

• a colourless solution

• a cloudy white precipitate

• a pale green flame