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What is an isotope?

Isotopes of an element exist when the atoms of an element have different numbers of neutrons, or in other words the same atomic number but a different mass number.
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Answered by Matthew T. • Physics tutor
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What is the difference between speed and velocity?

Speed is how fast an object is moving, whereas velocity is an objects speed in a given direction.
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Answered by Matthew T. • Physics tutor
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Solve the equation ((2x+3)/(x-4))-((2x-8)/(2x+1))=1

Step 1: Multiply everything by x-4 to give (2x+3) - ((2x-8)(x-4)/2x+1)=(x-4) Step2: Multiply everything by 2x+1 to give (2x+3)(2x+1)-(2x-8)(x-4)=(x-4)(2x+1) Step 3: Multiply out the brackets to give (4x 2 +8...
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Answered by Matthew T. • Maths tutor
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Why doesn't the concentration of products or reactants change when a reaction is at dynamic equilibrium?

At dynamic equilibrium in a closed system (for example, in the Haber process to make ammonia), both the forward and backward reactions continue to occur. However, both reactions happen at the same rate. Ther...
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Answered by Rose A. • Chemistry tutor
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How do you factorise a quadratic equation?

A quadratic expression is of the form ax ​2 +bx+c. It is often useful to know what values of x will make the expression equal to 0; these are known as the roots of the equation. An easy way of seeing what th...
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Answered by Tim W. • Maths tutor
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