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What is the difference between exothermic and endothermic?

Exothermic and Endothermic are opposite reactions. All reactions need energy to be put in to start them off, this is called the activation energy , but the overall energy gain can be either positive or negat...
Answered by • Chemistry tutor
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Why does the structure of lithium oxide allow it to conduct electricity under certain conditions?

Lithium oxide has the formula Li 2 O. 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 table, and o...
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Answered by Amy I. • Chemistry tutor
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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 (3x 2 -8x-3)/(2x)(x-3)Then I wou...
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Answered by James A. • Maths tutor
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Evaluate the Strange Situation as a method for investigating types of attachment.

Ainsworth devised an observation called the strange situation to measure types of attachment. The Strange Situation involves placing a child in a controlled environment, whereby they would be observed under ...
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Answered by Maryan H. • Psychology tutor
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There are 12 beads in a bag, all identical in shape but different in colour (4 are yellow, 3 are red, and 5 are blue). What is the likelihood of me picking out a blue and a yellow bead (in any order, and without replacement)

((4/12) (5/11)) + ((5/12) (4/11)) =((1/3) (5/11)) + ((5/12) (4/11)) =((1/3) (5/11)) + ((5/3) (1/11)) =5/33 + 5/33 =10/33
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