Ch 2 Bio
Card Set Information
Ch 2 Bio
What are the 3 particles that make up an atom?
PROTONS, NEUTRONS, ELECTRONS
Which particles move in the space around the nucleus?
What is atomic number?
What is mass number?
Mass number = proton number + neutron number
What is the definition of isotope?
ISOTOPES HAVE THE SAME NUMBER OF PROTONS AND ARE THE SAME ELEMENT BUT HAVE A DIFFERENT NUMBER OF NEUTRONS IN THE NUCLEUS
What is a compound?
A SUBSTANCE FORMED BY THE CHEMICAL JOINING OF TWO OR MORE ELEMENTS IN DEFINITE
How is a positive ion formed?
AN ATOM LOSES ONE OR MORE ELECTRONS
How is a negative ion formed?
AN ATOM GAINS ONE OR MORE ELECTRONS
What creates a covalent bond?
SHARING OF ELECTRONS between atoms
What happens during a chemical reaction?
Given a generic reaction A + B -> C + D what chemicals are the reactants?
What is the definition of a chemical reaction?
The process that changes one set of chemicals into another set of chemicals.
For the reaction profile graphs, how can you identify a reaction that absorbs energy?
THE CURVE RAMPS UPWARDS/THE PRODUCTS HAVE A HIGHER ENERGY THAN REACTANTS (see p. 51)
What is the atomic composition of water?
2 HYDROGEN ATOMS linked to 1 OXYGEN ATOM
n the reaction below (the synthesis of water), what is water?
2 H2 + O2 2 H2O
Describe the polarity of the water molecule.
THE OXYGEN HEMISPHERE IS SLIGHTLY NEGATIVE AND THE HYDROGEN HEMISPHERE IS SLIGHTLY
In sugar water, what is the sugar?
How would you classify a mixture made by adding salt to boiling water?
When any cells are mixed in water what forms?
What are the acidic phs?
What are the basic pHs?
Which pH is neutral?
How are acids described?
Have more H+ than OH- in solution.
How are bases described?
Have more OH- than H+.
How are neutral solutions described?
Have equal concentrations of H+ and OH-
What makes Carbon special?
Carbon has a valence of 4 and can bond to one another and form a lot of different structures.
How many bonds can Carbon form?
Which are the predominant atoms in biomolecules?
C = carbon/H = hydrogen/O = oxygen/P = phosphorus/N = nitrogen
Amino acids link to form a protein. What is formed when simple sugars link?
What are 3 key functions of proteins?
-They help fight disease (ex. Anitbodies are proteins.)
-They control the rate of reactions (ex. Enzymes are proteins.)
-They move substances into or out of cells. (ex. Membrane proteins can act as pumps.)
What are 3 falsehoods/un-truths about catalysts?
-Catalysts slow down the rate of reaction.
-All catalysts are enzymes
-Catalysts are consumed or used up during a chemical reaction.
What are basic accurate facts about enzymes?
-Enzymes work best at a specified pH.
-Enzymes are proteins.
-The shape of the enzyme allows it to do its job.