Chemistry GCSE (exo and endothermic reactions)

What is the initial rise in energy in a reaction?

Activation energy

Define activation energy in terms of reactants

The minimum amount of energy the reactants need to collide with each other and react

Give the independent variable in an energy transfer practical about acid concentration

The concentration of the acid used in the reaction

Give the dependent variable in an energy transfer variable about acid concentration

The temperature change of the reactants

How would you reduce energy losses through evaporation in an energy transfer practical

By using a lid

Explain a reaction profile

A diagram that shows the relative energies of the reactants and products in a reaction, and how the energy changes over the course of the reaction

If the products are at a higher energy than the reactants is the reaction endothermic or exothermic

Endothermic

Fill in the blank: Energy must always be _______ to break bonds

Supplied

If bonds are broken then this is therefore an ___________ reaction

Endothermic

In exothermic reactions, the energy ________ by forming bonds is _______ than the energy used to break them.

Released, greater

In endothermic reactions, the energy ____ to break bonds is _______ than the energy released by forming them.

Used, greater

Bond ________ is an endothermic process

Breaking

Bond _______ is an exothermic process

Forming

Name the equation for bond energy calculations

The sum of the energy required to break bonds in the reactants minus the energy released when new bonds are formed in the products

Now go practice some

Ok