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What is the difference between the perfect and the imperfect tense and when is it appropriate to use them?

In French, there are two primary tenses which are used to express something that happened in the past. These are the perfect and imperfect tense, referred to in French as le passé composé...

EM
Answered by Elliott M. French tutor
2101 Views

Why does the structure of lithium oxide allow it to conduct electricity under certain conditions?

Lithium oxide has the formula Li2O. It has an ionic structure as it is formed from a metal and a non-metal. It has lithium ions with a +1 charge, as lithium is found in Group 1 of the periodic ...

AI
Answered by Amy I. Chemistry tutor
11432 Views

Simplify fully (3x^2-8x-3)/(2x^2-6x)

First I would look for common factors in either the numerator or the denominator. The denominator has the common factor of (2x) so i would factorise it by 2x in order to give (3x2-8x-3)/(2x)(x-...

JA
Answered by James A. Maths tutor
3241 Views

An industry is producing copper sulphate (CuSO4) from copper carbonate (CuCO3) and sulphuric acid (H2SO4). The company calculated that from 800 g of CuCO3 they will produce 1kg of CuSO4. However they only produced 900g. What is the percentage yield ?

The percentage yield is calculated in the following way: (Actual yield/Theoretical yield)*100 Here, the actual yield is 900g and the theoretical yield that the company calculated is 1kg. ...

DL
Answered by Dora L. Chemistry tutor
2552 Views

pressure = 2.3 × 10^5 Pa temperature= 200K. At a constant volume, when the temperature increases to 300K what is the pressure in Pa?

Divide pressure by temperature to get the constant = 1150. Making sure all values are in the correct units.Then multiply by 300K to get the increased pressure. 3.45 x 10^5 Pa

RP
Answered by Rebecca P. Physics tutor
1902 Views

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