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Chemistry
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Why do first ionisation energies decrease down a group?

This is an example of remembering the basic trends of ionisation energies of different elements across the periodic table and applying this knowledge in detailWe take the Bohr model of the atom where the ...

Answered by Bence D. Chemistry tutor
1577 Views

What is the difference between and exothermic and endothermic reaction and how can you tell the difference?

An exothermic reaction is a reaction which transfers enerygy to its surroudings.And endothermic reaction is one that absorbs energy from its surroundings.An exothermic reaction will make its environment w...

Answered by Kawthar H. Chemistry tutor
1969 Views

Explain what is meant by dynamic equilibrium. (2)

The forward reaction and the backward reaction occur at the same time (1) and at the same rate (1).

Answered by Nancy M. Chemistry tutor
1824 Views

Draw a dot and cross diagram of a Chlorine molecule showing the outer electrons only.

Chlorine has seven outer electrons. Electrons like to be in pairs. In one Chlorine atom, there are three pairs and one lonely electron which doesn't have a pair. (draw). So two Chlorine atoms form a Chlor...

Answered by Lisa M. Chemistry tutor
13372 Views

Write a word equation for the reaction between marble chips and hydrochloric acid. (1) How could the rate of reaction be increased and why? (7)

i) Marble chips are made from calcium carbonate.Hydrochloric acid + calcium carbonate -> Calcium chloride + water + carbon dioxideii) The rate of reaction can be increased by increasing the concentrati...

Answered by Michelle K. Chemistry tutor
27388 Views

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