How does the chemical energy of the reactants compare to the chemical energy of the products?
In an endothermic reaction, the products have more stored chemical energy than the reactants. In an exothermic reaction, the opposite is true. The products have less stored chemical energy than the reactants. The excess energy in the reactants is released to the surroundings when the reaction occurs.
What can be absorbed or released as the result of chemical reaction?
Energy and Chemical Reactions These reactions, called exothermic reactions, release energy. In other chemical reactions, it takes more energy to break bonds in reactants than is released when bonds form in products. These reactions, called endothermic reactions, absorb energy.
Which type of reaction releases the most energy?
Is Heat always released in a chemical reaction?
No, heat is not always released during a chemical reaction.
How do we calculate the overall energy change of a reaction?
To calculate an energy change for a reaction:
- add together the bond energies for all the bonds in the reactants – this is the ‘energy in’
- add together the bond energies for all the bonds in the products – this is the ‘energy out’
- energy change = energy in – energy out.
Which substance is completely consumed in a chemical reaction?
What is the maximum possible amount of product obtained in a chemical reaction?
Chemistry Chapter 9 Matching
|excess reactant||The substance that is not used up completely in a reaction.|
|Theoretical yield||Maximum amount of product that could be obtained under ideal conditions from a given amount of reactants.|
|Actual yield||The measured amount of a product obtained from a reaction.|
What does a chemical change always result in?
The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction.
Is frying an egg a chemical or physical reaction?
When chemical bonds are broken or formed, new particles are created. Therefore, frying an egg is a chemical change because it results in the formation of new particles.
Why is baking a cake a chemical reaction?
Baking a cake is a chemical change because the baking powder or baking soda will undergo a chemical reaction. The heat helps baking powder or soda produce tiny bubbles of gas which makes the cake light and fluffy. That’s why chemical reactions are involved in baking a cake.