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Calculate the enthalpy of formation of water.Is the reaction an exothermic or endothermic reaction?

The reaction is as follows: 2H 2 + O 2 -> 2H 2 O This means that for every 2 molecules of Hydrogen gas, one molecule of Oxygen is needed to make 2 molecules of water To calculate the enthalpy of this reac...
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Answered by Sarah L. • Chemistry tutor
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2476 adults watch a cricket match. The ratio men : women is 3 : 1 How many more men than women watch the match?

The ratio of 3:1 involves 4 units. 3 men +1 woman. Find how many people each unit represents: 4units 2476 people Therefore each unit represents 2476/4 = 619 people per unit Now, take the ratio, and multiply ...
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Answered by Nathaniel S. • Maths tutor
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Explain what is meant my validity and reliability

Broadly speaking, validity refers to accuracy whereas reliability refers to consistency . There are many types of reliability and validity, I few of which I have explained here: - Internal validity is the ex...
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Answered by Louise W. • Psychology tutor
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What is the difference between meiosis and mitosis?

There are a few fundamental differences between these processes. Mitosis is required for cell growth and repair and asexual reproduction. Meiosis is used in the production of gametes for sexual reproduction....
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Answered by Alexis B. • Biology tutor
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What is an integral?

An integral is the area that lies below a graphed line and the x-axis, an indefinite integral is when an interval is not used, and so is often infinite, as it covers the entire area under a graph, and not ju...
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Answered by James B. • Maths tutor
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