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What is the standard enthalpy change of formation and how does it differ from the standard enthalpy change of reaction?

The enthalpy change of formation is the enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states. Meanwhile the enthalpy change of reaction is the enthalp...

AJ
Answered by Abigail J. Chemistry tutor
2720 Views

What is the use of membranes within the cell?

Membranes within the cell are used in compartmentalisation for numerous reasons- one being to allow processes to occur separately in different organelles without interacting and affecting other processes,...

AJ
Answered by Abigail J. Biology tutor
2377 Views

What is a standard electrode potential?

The EMF voltage produced when a half cell is connected to a standard hydrogen half cell under standard conditions. Standard conditions are 298 Kelvin, 100 kPa, and all solutions must be in 1 moldm-3 ...

AJ
Answered by Abigail J. Chemistry tutor
1947 Views

How do you make a buffer?

A buffer is a mix of an excess of weak acid and its salt. Buffers can be made in two ways- by mixing the weak acid with its salt or by partially neutralising the weak acid with base. 1- Making buffers by ...

AJ
Answered by Abigail J. Chemistry tutor
2279 Views

Fahima buys 2 packets of bread rolls costing £1.50 for each packet 1 bottle of ketchup costing £1.60 3 packets of sausages Fahima pays with a £10 note. She gets 30p change. Fahima works out that one packet of sausages costs £2.30 Is Fahima right?

Let's denote the price of sausages as S as it's the only unknown.Let's use simple algebra to solve this.To find the total price of all of the items she purchased ( i.e. the value), we multiply price by th...

MC
Answered by Maria C. Maths tutor
11494 Views

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