Reactants, Products, and Bond Energy
What is the relation between reactants and products?
Reactants, which are raw materials or substances, undergo through chemical changes which transform these into products.
What do the arrows in the equation show?
The arrows in the equation show that the reaction goes in both directions.
______________ is the amount of energy that needs to be absorbed for a chemical reaction to start.
Activation energy
The prefix that means “out” is...
Exo-
_________________ change substances into different substances by breaking and forming chemical bonds.
Chemical reactions
What happens to bonds when reactants transform into products?
When reactants transform into products, bonds between atoms are broken and later new ones are formed.
___________ is reached when both the reactants and products are made at the same rate.
Equilibrium
When new bonds are formed in the products, ______ is released.
The prefix that means “in” is...
____________ are the substances changed during a chemical reaction.
Reactants
In what format are chemical reactions represented?
Chemical reactions are represented by chemical equations, which are formatted in the way that reactants are on the left side of the equation and products are on the right side.
True or False. Chemical equilibrium is reached when both the reactants and products are made at the same rate.
True
Whether a reaction releases or absorbs energy depends on __________.
a) Bond Energy
b) Energy
c) Activation Energy
Bond Energy
Is melting ice endothermic or exothermic?
Endothermic
___________ are the substances made by a chemical reactions.
Products
How is bond energy and the transformation of reactants into products related?
Since the transformation of reactants into products requires bonds to be broken, a specific amount of energy is necessary to break these bonds. This energy needed is called bond energy.
True or False. Chemical equilibrium occurs when chemical reactions in living organisms are reversible, meaning they can move in different directions.
False. Chemical equilibrium occurs when chemical reactions in living organisms are reversible, meaning they can move in BOTH directions.
A girl is pushing her sled up a mountain. Once she reaches the top of the mountain, she pushes the slide a little hard and it slides down the mountain without her. Can this be an example of activation energy? If so, in what part of the text is activation energy represented?
Yes, in the part that mentions she is pushing her sled up the mountain.
When you burn wood, is it an exothermic change?
Yes, it is an exothermic reaction.
___________ is the amount of energy that will break a bond between two atoms.
Bond energy
How can the energy required to break bonds be compared to the energy released after the formation of new bonds?
The same amount of energy required to break apart bonds is the same that is released after the formation of new bonds.
What does it mean for a reaction to be reversible in living organisms?
They can move in both directions, from reactants to products and vice versa.
The two types of chemical reactions are...
Endothermic and Exothermic
What kind of change happens when we cook food, endothermic or exothermic?
Endothermic
An ____________________________ releases more energy than it absorbs.
Exothermic chemical reaction