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What is a formula of Potassium Sulfate?

First, look at the Periodic Table. Potassium is in group 1 so has a +1 charge, Li + Sulphates always have a -2 charge, SO4 2- Now combine two ions together so we can get a neutral compound. We have +1 charge...
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Answered by Laura B. • Chemistry tutor
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What is a rate of reaction? How can we calculate the rate of reaction?

Rate of reaction is a change in concentration of a reactant or product, per unit time, measured in dm 3 s-1. You can calculate the rate of reaction from the graph- plot the graph of concantration of reactant...
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Answered by Laura B. • Chemistry tutor
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What is the equation of the curve that has gradient dy/dx=(4x-5) and passes through the point (3,7)?

To answer this question, we must use our knowledge of integration and differentiation. First, we look at the information given to us. We have been told that the gradient of the curve is given by dy/dx=(4x-5)...
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Answered by Samradnyee K. • Maths tutor
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Define the terms atomic number and mass number

The atomic number, Z, is the number of protons in the nucleus. The mass number ,A, is the total number of protons and neutrons in the atom.
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Answered by Laura B. • Chemistry tutor
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Solve the following simultaneous equations to find the values of x and y: 3y - 7x = 15 & 2y = 4x + 12

Equation one: 3y - 7x = 15 - Double it and re arrange 3y - 7x = 15 goes to 3y = 7x + 15 goes to 6y = 14x + 30 we name this equation 3 Equation two: 2y = 4x +12 - Triple it. so..6y = 12x + 36 we name this equ...
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Answered by Imogen P. • Maths tutor
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