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Chemistry
GCSE

Explain, in terms of particles, why the rate decreases during the reaction between magnesium and hydrochloric acid.

There are 2 ideas that need to be included here :The concentration of acid decreases over time So collisions are less frequentAs the reaction proceeds more and more molecules would have collided successfu...

Answered by Stefan-Andrei M. Chemistry tutor
7978 Views

Explain why pure metals can be bent and shaped, whereas alloys cannot?

In pure metals the atoms are all the same size , hence the layers of atoms can slider over each other. However, in an alloy the different size atoms distory the layers in the structure hence it is difficu...

Answered by Ekaahh S. Chemistry tutor
10020 Views

The composition by mass of a compound is: C=36.4%, H=6% and F=57.6%. Calculate the empirical formula. If the RFM is 66, what is the molecular formula?

Calculate the moles of each of the 3 elements (to get C=3.03, H=6, F=3.03). Divide these by the smallest mol calculated to get the ratio of the elements. This will get C:H:F as 1:1.978:1 = 1:2:1 and so th...

Answered by Sara T. Chemistry tutor
4827 Views

Why do melting points decrease down group I?

As we go down group I, the ions have larger shells and the distance between the bonding electrons and positive nucleus decreases. This decreases the overall attraction forces between the two in metal latt...

Answered by Chloe W. Chemistry tutor
2709 Views

What elements make up the halides?

Flourine, chlorine, bromine, iodine, astatine

Answered by Will C. Chemistry tutor
1690 Views

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