Biology Chapter 2
Which property of water causes sugar to dissolve in coffee?
Water is a good solvent.
A water molecule, as shown here, is polar because of
unequal sharing of electrons.
An ionic bond forms when
a negatively charged ion is attracted to one with a positive charge.
A covalent bond occurs when
electrons are shared between two atoms to complete their octets.
Which of the following is a molecule?
O- 2
Which one of the following is the smallest unit of matter that has all the properties of an element?
atom
The figure below is depicting the interaction of water molecules with one another. The weak attractions between water molecules are known as
hydrogen bonds.
Which of the following would be considered a trace element in living things?
zinc
The number of neutrons present in the nucleus of an average atom of any given element is best estimated by
subtracting the number of protons from the mass number.
Which of the following is a property of water?
All of the above are properties of water.
When a sodium atom transfers an electron to a chlorine atom
All of the above statements are correct.
Which of the following statements about basic solutions is true?
Basic solutions release OH-.
A(n) ________ can be defined as a substance that keeps pH within established limits by taking up excess H+ or OH- in a solution.
buffer
Isotopes of an element differ in their
neutron number
The subatomic particles that are found in the nucleus of an atom are the
neutrons and protons.
In the reaction 6CO2 + 6H2O → C6H12O6 + 6O2 carbon dioxide is one of the
reactants.
An atom that has an electrical charge is called a(n)
ion
Which of the following statements about atoms is correct?
The number and arrangement of electrons in an atom governs its chemical activity.
In what ways are radioactive isotopes potentially harmful?
Unmonitored release into the environment can make changes in a cell's DNA.
The type of bond that would form from the transfer of an electron from one atom to another is a(n) ________ bond.
ionic
