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Bio ch. 2
Terms in this set (25)
Ice floats on water because
water expands when it freezes
n atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number would be
Water molecules are polar, with the
oxygen side being slightly negative and the hydrogen side being slightly positive
If an atom contains 11 protons and 12 neutrons, its atomic number is
When salt is dissolved in water, water is the
If the pH of stomach acid and of oven cleaner were measured,
the pH of stomach acid would be below 7, but the pH of oven cleaner would be above 7
Chemical reactions that release energy
often occur spontaneously
Which of the following in NOT a monomer?
Which term does NOT apply to sodium chloride?
Which of the following statements is true about catalysts?
Catalysts lower the activation energy of a chemical reaction
Which of the following is NOT true about chlorine?
It is not reactive
What type of ion forms when an atom loses electrons?
A solution is an
evenly distributed mixture of two or more substances
Democritus believed that atoms
could not be divided
Which of the following is a use of radioactive isotopes?
All of the above ("tracers", treat cancer, kill bacteria, determine age of rocks and fossils)
Which statement is true?
RNA molecules are made of nucleotides
Identify the reactants in this chemical reaction, CO2 + H2O----> H2CO3
CO2 AND H2O
Which of the following statements about enzymes is NOT true?
All enzymes have the same shape as their substance
Which of the following statements about a compound is true?
The physical and chemical properties of a compound are usually very different form those of the elements from which it is formed
In chemical reactions, atoms are
Solutions that contain concentrations of H+ ions lower than pure water
Enzymes affect the reactions in living cells by changing the
speed of the reaction
Which of the following is NOT a function of proteins?
Store and transmit genetic information
Amino Acid is to protein as
simple starch is to sugar
What is the term used to describe the energy needed to get a reaction started?
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