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Why does magnesium oxide have such a high melting point?

Metal and non metal so ionic bondingStrong electrostatic forces of attraction between the positive and negative ionsWhich require lots of energy to break
LH
Answered by Lia H. • Chemistry tutor
5720 Views

What are the differences between the use of the preterite and imperfect tenses in Spanish?

The preterite and imperfect are both past tenses in Spanish. In general, the preterite tense is used to describe actions that took place in the past and are completed , while the imperfect is used for action...
MA
Answered by May A. • Spanish tutor
2306 Views

Can you please explain how to expand two brackets, eg. (3x-7)(5x+6)

When I am expanding brackets I use the acronym FOIL and simplify. You begin by multiply the first term (F) in each bracket, followed by multiplying the outside terms (O), then the inside terms (I) and finall...
Answered by • Maths tutor
5275 Views

Explore Hardy's presentation of Alec's desire in Tess of the D'Urbervilles

ardy broadly presents desire as a negative, disruptive force within the novel. This disruption emerges firstly from Alec's desire for Tess, which leads to her being raped in the section Maiden no More, as he...
KC
10285 Views

Given that cos(x) = 1/4, what is cos(2x)?

cos(2x) = 2cos 2 (x) - 1 This is the identity. Therefore we can substitute in 2[cos 2 (x)] to be 2 multiplied by (1/4) 2 .Therefore cos(2x) = 2(1/4)(1/4) - 1 = 2/16 - 1 = 2/16 - 16/16 =1/8 - 8/8 = -(7/8).Ans...
BK
Answered by Bhumi K. • Maths tutor
9848 Views