Biology Chapter 2 | Tougaloo
Sucrose, C12H22O11, is best described as a(n)
compound.
The pH scale is a mathematical indicator of the
concentration of H+ present in a solution.
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.
The pH of pure water is ______ because ________.
7.0; water contains an equal number of H+ ions and OH- ions.
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are
76 protons and 76 electrons.
Given the chemical equation: C6H12O6 + 6 O2 → 6 CO2 + 6 H2O, identify which of the following statements are correct.
- H2O is a product. - O2 is a reactant.
Which of the following properties of water involve hydrogen bonds?
- cohesion - high heat capacity - surface tension
Which of the following statements about basic solutions is true?
Basic solutions more OH- than H+.
Which of the following is an example of the heat capacity of water?
Living organisms are able to maintain their internal body temperatures because the water in their cells resists changes in temperature.
Which of the following can be described as a molecule but not a compound?
O-
Which of the following statements about atoms is correct?
The number and arrangement of electrons in an atom governs its chemical activity.
What do lemons, tomatoes, and coffee all have in common chemically?
They all release H+ ions in solution, making them acids.
Which of the following property of water explains why a wet glass slide sticks to laboratory counter?
Water is adhesive.
An ionic bond forms when
a positively charged ion is attracted to a negatively charged ion.
Which one of the following is the smallest unit of matter that has all the properties of an element?
atom.
All atoms of the same element have the same
atomic number.
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.
An atom's valence electron shell
determines its chemical reactivity.
A covalent bond occurs when
electrons are shared between two atoms to complete their valence shells.
Some insects can walk on the surface of water because water
has surface tension.
When water changes from a liquid to a gas
hydrogen bonds are broken between neighboring water molecules.
The figure below is depicting the interaction of water molecules with one another. The weak attractions between water molecules are known as
hydrogen bonds.
An atom that has an electrical charge is called a(n)
ion.
The type of bond that would form from the transfer of an electron from one atom to another is a(n) ________ bond.
ionic.
Elements that differ in their ________ are known as isotopes.
neutron number.
The subatomic particles that are found within the nucleus of an atom are the
neutrons and protons.
A water molecule, as shown here, is polar because
oxygen has a stronger electronegativity than hydrogen.
The atomic structure of water satisfies the octet rule by having
oxygen share electrons with two hydrogen atoms.
In the reaction C6H12O6 + 6O2 → 6CO2 + 6H2O carbon dioxide is one of the
products.
Chemical bonds involve
the giving, taking, or sharing of electrons.
Isotopes of an atom differ in
their atomic mass.
Sugar dissolves in coffee because
water is a good solvent.
Of the following examples, which best demonstrates cohesiveness of water?
water moving up a 100-foot pine tree, from the roots to the leaves
