BSC2010 Ch.2
There are how many naturally-occurring isotopes of oxygen?-------
3
If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?
58
If there are 8 protons in the nucleus of an atom how many electrons are there?
8
Four elements make up what percent of the human body
96%
What kind of element would you find on the far left-hand side of the periodic table?
A metal
What is the chemical symbol for magnesium?
Mg
What are the four elements that make up so much of our body
Nitrogen, Carbon, Oxygen and Hydrogen
Select the bond that is most polar
O-H
The 3d subshell can hold a maximum of how many electrons?
10
An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain?
16
Which of the following is a noble gas configuration?
1s2 2s2 2p6
Calcium has an atomic number of 20. What is its electronic configuration?
1s2 2s2 2p6 3s2 3p6 4s2
A non-bonding orbital can contain a maximum of how many electrons?
2
Which of the following is a noble gas configuration?
2
One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
250 g
Shell three contains how many sub-shells?
3
Which of the following is not produced if you mix vinegar (an acid) and sodium bicarbonate (an alkali, or base) together
Air
An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?
An atom of sodium has 11 protons, 11 electrons, and 12 neutrons
The symbol Sb stands for stibnum or stibnite. What is the modern name of this element?
Antimony
Which of the following is a noble gas?
Argon
Which is a subatomic particle?
Both B and D (electron, proton)
Which of the following is a non-polar bond?
C-C
What is the correct molecular formula for a compound containing nine hydrogen atoms, three carbon atoms, one oxygen atom, and one nitrogen atom?
C3H9NO
Which of the following bonds is most strongly polarized?
C= O
Which of the following has the highest pH value?
Caustic soda
Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
Chlorine
Which of the following puts the elements in the right order in terms of their valency, starting with the element of lowest valency?
H, O, N, C
This compound has little or no carbon to carbon bonds
Inorganic compound
What are the most common elements in the human body?
Oxygen, carbon, and hydrogen
The symbol Ag stands for which element?
Silver
Which of the following is not a functional group that can bond with carbon?
Sodium
Which of these elements is a nonmetal?
Sulfur
A landscaper wants to plant shrubs that require a soil pH of 7.0 near some evergreen trees, and the soil in this location is a pH of 6.0. Which course of action should he pursue?
The soil has ten times the H+ concentration he desires so he should add an alkaline material to the soil.
Which of the following best explains the natural formation of ions?
an unfilled outer electron shell and electron transfer
Which of the following is the fundamental unit of matter?
atom
Which of the sequences below is correctly ordered from smallest to largest classification level of life?
atom
The mass of a single atom of a particular isotope is called which of the following?
atomic mass
A molecule that binds up excess hydrogen ions in a solution is called a(n)
base
Which of the following molecules are often made of oxygen, hydrogen, and carbon only?
carbohydrates
What type of chemical bond links carbon atoms together in the "backbone" of macromolecules?
covalent
When acids are added to a solution, the pH should
decrease
Each carbon molecule can bond with as many as --------------other atoms or molecules
four
The simplest organic molecules, consisting of hydrogen and oxygen, are known as
hydrocarbons
Which type of bond represents a weak chemical bond?
hydrogen bond
An atom that gains or loses an electron or pair of electrons is called a(n)
ion
Atoms that vary in number of neutrons found in their nuclei are called
isotopes
Which of the following molecules may contain atoms other than hydrogen, oxygen, or carbon?
organic molecules
Which of the following places the atomic subshells in the correct order of relative energy, starting with the subshell of lowest energy?
s,p,d
Potassium has an atomic number of 19. What is its electron configuration?
shells 1, 2 and 3 are full and shell 4 has one electron
How would you show that sodium and chloride ions present in a solution of water can bond together to make table salt?
show that table salt results when all the water evaporates
Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?
slightly acidic
The identity of a chemical element is determined by which of the following?
the number of protons it posesses
What is the most common isotope of hydrogen?
Protium
