Chemical Basis of Life I: Atoms, Molecules and Water
Isotopes are different forms of the same element that
differ in their number of neutrons.
Which of the following is NOT a molecule?
Table salt forms from sodium and chloride via hydrogen bonding.
The molarity of a solution is
scientific term for determining the solubility of a substance in water.
this is formed when one atom loses an electron to another atom.
cations and anions that can form ionic bonds
The presence of salt helps prevent oceans from freezing.
Which of the following represents an ion?
For water to vaporize
energy must be released.
Nitrogen has 7 electrons and can form a maximum of ____________bonds with other elements
On gram of hydrogen, which has an atomic mass of 1, would have fewer atoms than 1 gram of carbon that has an atomic mass of 12.
In water, MgCl2 dissociates into Mg2+ and Cl. Based on this information what type of bond in involed in the formation of MgCl2?
If orange juice has pH of 4 then
it is an acidic solution
When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is formed via a(n)
double covalent bond.
The atomic number of an atom is
the number of protons in the atom.
Which is true about a pH buffer?
It reduces the amount of OH- in an acidic solution.
Molecules are generally rigid structures and rarely change shape.
Considering solutions with the following pH, which is alkaline?
Isotopes are different forms of the same element.
The nucleus of an atom is composed of
protons and neutrons.
Sulfur 35 (35S) is an isotope of 32S. These elements differ in their number of neutrons.
Which of the following represents an abundant element found in living organisms?
limit major shifts in the amount of H+ and OH- in solution.
The first, liner-most energy shell of an atom
can have a maximum of electrons.
A dehydration reaction that builds larger molecules from smaller units requires the addition of a water molecule.
Which of the following is a feature of carbon that makes the formation of complex molecules possible?
Carbon can form a maximum of 4 covalent bonds.