Biology Lesson 2: Chemical Reactions

Explain the meaning of the symbols as they are used in this expression. A+B yields C+D C and D are: -elements only -molecules only -elements or molecules -reactants -products

-Elements or Molecules -Reactants -Products

Explain the meaning of the symbols as they are used in this expression. A+B yields C+D A and B are: -elements only -molecules only -elements or molecules -reactants -products

-Elements or molecules -Reactants -Products

Match the chemical reactions: 1. molecules rearrange and form new molecules 2. simultaneous decomposition and synthesis 3. bonds broken and elements released 4. molecules formed from components

1. Exchange 2. Reversible 3. Decomposition 4. Synthesis

Explain the meaning of the symbols as they are used in this expression. A+B yields C+D + means that the substances _____________ (are, are not) chemically combined.

Are not

What occurs during a decomposition reaction? A) the components of several molecules recombine to form new molecules B) a compound partitions into its components C) new compounds are formed by chemical bonding

B) A compound partitions into its components

The reaction B + K yields L + H will quicken from right to left if: A) B is added and K is removed B) B is removed and H is added C) B is added and L is removed D) B is removed and K is added

B) B is removed and H is added

What is required for reactants to form bonds? A) energy output B) energy input C) equilibrium D) exchange reaction

B) Energy Input

In the chemical reaction that takes place in the lighting of a match, activation energy is supplied by _____. A) chemicals in the match B) friction

B) Friction

The products and reactants of a(n) _____ reaction will form at the same rate when equilibrium is attained. A) decomposition B) exchange C) reversible D) synthesis

C) Reversible

Which type of reaction is dependent on the concentration of the products and reactants? A) decomposition B) exchange C) reversible D) synthesis

C) Reversible

The arrows in the image define the equation as _____. A+B (yields) C+D A) decomposition B) exchange C) reversible D) synthesis

C) reversible

The rate and direction of reactions are greatly influenced by the: A) Law of Mass action only B) molecular concentration only C) neither D) Law of Mass action or molecular concentration because they relate to the same principle

D) Law of Mass action or molecular concentration because they relate to the same principle

In the reaction B + K yields L + H, if an additional B is added, the result will be: A) more K will be produced B) more L will be required C) the reaction will slow down D) more L and H will be produced

D) More L and H will be produced

Chemical equilibrium results if: A) all reactants are used up B) some products are removed C) more reactants are added D) forward reaction rate equals reverse reaction rate

D) forward reaction rate equals reverse reaction rate

A(n) ________________ reaction occurs when ionic or covalent bonds are broken and elements, ions, or simpler molecules are formed.

Decomposition

A(n) _____________ reaction occurs when the bonds of the reacting compounds are broken and new combinations are formed.

Exchange

Which processes are involved in metabolism? A) synthesis, growth, repair B) decomposition, energy release C) reversible reactions, equilibrium D) synthesis and decomposition E) exchange reactions, control of pH F) all of the above

F) All of the above

A plant must supply energy through photosynthesis in order for its complex starch molecules to breakdown to a simple sugar. -True -False

False

Chemical reactions will occur independently of the reactant's temperature. -True -False

False

Match the following. 1. The reactants used to form the products can also be synthesized from those products 2. That which is produced as a result of a chemical reaction 3. The energy required to start a chemical reaction 4. A chemical reaction where the substrates trade constituent parts 5. The concentration of reactant product influences the rate and net direction of a reversible reaction 6. The compound is broken into its constituent parts

1. Reversible Reaction 2. Product 3. Activation Energy 4. Exchange Reaction 5. Law of Mass Action 6. Decomposition

Match the following. 1. Two or more units are added together to form a new compound 2. Accelerates a chemical reaction without being used up in the reaction 3. When a reversible reaction is occurring in both directions at the same rate 4. All of the chemical reactions in the organism for maintenance of the processes of life 5. A substance which will resist changes in pH within reasonable limits 6. A protein molecule which speeds up a specific chemical reaction in biological systems

1. Synthesis Reaction 2. Catalyst 3. Chemical Equilibrium 4. Metabolism 5. Buffer 6. Enzyme

The process by which organisms decompose food and synthesize energy and tissue is __________________ .

Metabolism

A substance which results from a one-way chemical reaction is called a _________________

Product

A(n) ______________ reaction occurs when the reactants are reproduced by reaction of the products.

Reversible

A(n) ____________ reaction occurs when a molecule is formed from the bonding of atoms, ions or simpler molecules.

Synthesis

When fats decompose in an organism, energy is released. -True -False

True

A substance which enters into a chemical reaction is called a ___________________.

reactant