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What is the difference between an endothermic and exothermic reaction? How would you determine if a reaction was endothermic or exothermic using simple lab equipment?

An exothermic reaction is one in which heat is released from the reaction system to its surroundings, causing an increase in temperature. 'Exo' means to give off, heat is expelled in this reaction. An endoth...
AC
Answered by Annu C. • Chemistry tutor
7620 Views

Explain how a population of antibiotic-resistant bacteria might develop from non-resistant bacteria.

There is genetic variation within the population of bacteria The variation has occurred due to random genetic mutations This variation means that a bacterium may have a mutation that gives it resistance to a...
MP
Answered by Maia P. • Biology tutor
10761 Views

What are all the different cases in Russian used for? How do you use them ?

There are 6 different cases in Russian, lets go through the first one: 1) nominative (именительный падеж)- this is when the noun of a sentence is the subject of the sentence. So it answers the questions 'wha...
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Answered by Sofia R. • Russian tutor
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Assess the extent to which a depreciation of the Pound will positively effect economic performance within the Uk.

Intro: define depreciation and economic performance Analysis: depreciation leads to increase in exports (less expensive in comparison to foreign goods), and decrease in imports (more expensive in comparison ...
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Answered by Oscar B. • Economics tutor
2682 Views

When should I choose to use the tenses of the "imparfait" or the "passé simple"?

These two tenses both express actions and states in the past. However, the imparfait should be used in cases of repetitive situations, a description or an action without a limited time frame. For instance, &...
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Answered by Eliot F. • French tutor
2478 Views