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When do you use the imperfect tense in Spanish?

One of the main purposes of the imperfect tense is to show that an action has been repeated over a course of time in the past. It can be used, for example, when you want to express hobbies or habits in the p...
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Answered by Nayaab B. • Spanish tutor
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How is unemployment related to causes of inflation?

Inflation is a sustained rise in general price levels. There are several causes for prices to rise. When production costs, such as wages and raw material prices increase- cost-push inflation occurs. Inflatio...
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Answered by Mark B. • Economics tutor
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1 a) What is a pathogen? 1 b) How do white blood cells help to defend the body against pathogens?

1 a) a microorganism that causes infectious disease 1 b) White blood cells: - Ingest pathogens - produce antibodies which destroy particular bacteria or viruses - produce antitoxins which counteract the toxi...
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Answered by Lauraa B. • Biology tutor
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When do I use the subjunctive in Spanish?

There are 2 moods in Spanish: the indicative, and the subjunctive. The indicative is used for anything that is concrete/ factual. For example: "Max habla español" (Max speaks Spanish). This is a fa...
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25cm3 of NaOH (2M) were titrated with 1.25M H2SO4. Write down the balanced reaction equation. Calculate the number of moles of NaOH used in the titration and hence deduce the volume of sulfuric acid used in the titration. Give your answer in dm3.

2NaOH + H2SO4 -> 2H2O + Na2SO4. moles = concentration x volume. #moles NaOH = 2M x (25/1000)dm3 = 0.05 mol. The reaction equations shows the ratio of alkali to acid is 2:1. The number of moles of H2SO4 re...
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Answered by Tiffany W. • Chemistry tutor
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