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Chemistry
A Level

Why do the atomic radii of the elements decrease across a period?

Moving across a period the number of protons and neutrons that make up the nucleus of the element increases. The increase in the number of positively charged protons results in an increased nuclear charge...

Answered by Harry K. Chemistry tutor
1518 Views

How can pressure affect the equilibrium shift of a reversible gaseous reaction?

Le Chatelier's Principle states the if a change is applied to a system in equilibrium, then the position of equilibrium will move to counteract that change. So, if the pressure was increased for a reactio...

Answered by Tejal W. Chemistry tutor
1807 Views

What does the strength of lattice enthalpy of formation depend on?

So, lattice enthalpy of formation is defined as the 'standard enthalpy change when one mole of an ionic crystal lattice is formed from its constituent ions in gase...

Answered by Zaynab A. Chemistry tutor
2054 Views

Explain why the reactivity of Group 2 elements increases down the group.

Moving down Group 2, the atomic radius increases as there are more electron shells. This also means that the outermost electrons are more shielded from the positive charge of the nucleus. This decreases t...

Answered by Joe C. Chemistry tutor
5238 Views

Describe a simple way to distinguish between aqueous solutions of potassium nitrate (KNO3) and potassium sulfate (K2SO4) using one test tube reaction

Add one of the following: barium chloride, barium hydroxide, barium nitrateObservation with potassium nitrate: colourless solution/ or no visible change or reaction) Observation with potassium sulfate: wh...

Answered by Rebecca S. Chemistry tutor
7840 Views

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