chemistry mid term
What is the formula for aluminum hydroxide?
Al(OH)3
What is the formula for aluminum nitride?
AlN
Which of these ions is likely to form?
F -
What ion has the same number of electrons as argon, Ar?
P3-
Which of the following will have a pyramidal shape?
PH3
Which is an example of matter?
Rain
What element has this electron configuration: 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p1?
Thallium, TI
What is different about the three different isotopes shown below? Carbon-12 Carbon-13 Carbon-14
The number of neutrons
Isotopes of an element differ only in the number of what subatomic particles?
neutrons
What is the name of this compound: KNO3?
potassium nitrate
What is the density of a liquid if the volume is 25 mL and the mass is 20 g?
0.8g/mL
How many valence electrons does potassium have?
1
The atomic number of nitrogen is 7. How many lone pairs are there in a Lewis dot diagram of NH3?
1
What is the maximum number of electrons that can occupy a D-subshell
10
What is the maximum number of electrons that can occupy an s-subshell?
10
In the formula for hydrogen peroxide, H2O2, what is the ratio of hydrogen, H, to oxygen, O?
1:1
What is the electron configuration for phosphorus, P
1s2 2s2 2p6 3s2 3p3
What element has this electron configuration: [Rn]7s2?
Radium, Ra
What element has this electron configuration: 1s22s22p63s23p64s23d104p6?
Krypton, Kr
What type of molecular representation is shown below?
Lewis dot diagram
What is the formula for lithium oxide
Li2O
The element calcium, Mg, reacts with oxygen, O, to form magnesium oxide, MgO. What compound do you predict for the reaction of Mg with sulfur, S?
MgS
What is the formula for ammonium bromide
NH4Br
Which of the following correctly lists the five atoms in order of increasing size (smallest to largest)?
Ne < O < S < Si < Ge
What is the formula for ammonium sulfate?
(NH4)2SO4
In the formula for sodium sulfide, Na2S what is the ratio of sodium, Na, to sulfur, S?
2:1
How many valence electrons are in an element with an electron configuration of 1s22s22p1?
3
How many covalent bonds does this molecule have
4
What is 6.22 mL of water in cubic centimeters?
6.22 cm3
How many electrons are in a neutral atom of gold?
79
What ion has the same number of electrons as helium, He?
Be2+
Which of these elements has three valence electrons?
Boron
The chemical formula for lithium chloride is LiCl. What formula do you predict for calcium chloride?
CaCl2
What is the formula for calcium chloride
CaCl2
Which of the following molecules is polar?
HNHH
The effective nuclear charge of an atom is primarily affected by_____.
Inner electrons
Which is not part of the definition of matter?
It can be seen
An atom of which element has 19 electrons when neutral?
K
Cu is an example of_________.
an element
Which of these elements has two valence electrons?
beryllium
Which of the following elements has the largest atomic number?
iodine, I
Which two things should you do in the case of a chemical spill on your skin or clothing?
rinse with plenty of water, tell the teacher.
What is the shape of a molecule of carbon tetrachloride, CCl4?
tetrahedral
Chemists have developed a noble gas shorthand for writing the electron configuration of elements. This shorthand works because _______________.
the electron configuration of a noble gas includes all of the filled subshells of the elements that come before the noble gas.
