Chem Exam STUDY
How many deciliters are in 12 liters?
120 deciliters
Given the equation: 2C4H10+13O2=8CO2+10H2O; what is the molar ratio between oxygen and water?
13 : 10
How many L of hydrogen react with 2.00 mol of Nitrogen at STP in the following reaction N2 + 3H2 -> NH3
134.4*
How many mL are in 14.5 Liters?
14500
What is the atomic mass of the element: 15 over 7 in front of N
15
What is the electron configuration of Oxygen?
1s2 2s2 2p4
How many atoms are in 4.4 moles of calcium?
2.65E24
A students measurement of the density of an object is 1.24 g/mL. The known density of the object is 1.55 g/mL. Calculate the students percent error.
20%
What is the molar mass of Al(NO3)3?
212.9
The volume of 1.2 mol of Ar at STP is
26.9
In order to balance the following equation, what are the correct coefficients? NaBr+Ca(OH)2= CaBr2+NaOH
2NaBr + Ca(OH)2 = CaBr2+2NaOH
A student takes a series of measurements on a balance. The measurements are 9.00 g, 10.0 g, and 10.11 g. The average grams reported to the correct significant figures is:
3 SD
trigonal pyramidal
3 bonds, 1 lone pair
how many protons, neutrons, and electrons are in a neutral atoms of oxygen
8 - protons - 8 - neutrons 8 - electrons
The % of composition of ammonia (NH3) is
82.4%(N) 17.6%(H)
isotopes
Atoms with the same number of protons but different numbers of neutrons
Tetrahedral
CH4
Which is the correct formula for Iron(III)chloride?
FeCl3
describe the three main states of matter in terms of their organization of their molecules, their physical aspects of their form, and the average kinetic energy.
GAS - moves fast and freely, spread out molecules and no physical shape. LIQUID - moves and hits one another, closer together but still able to move freely, definite volume SOLID - moves fast against one another, tightly compacted, cannot move freely, has physical shape.
EXPLAIN how to move from grams to molecules
Heart diagram grams, moles, periodic table, atomic number, molecules, atoms
Noble gases have.?
Highest ionization energy (energy required to lose an electron)
What is the relationship between pressure and volume?
Inversley proportional + ?
Which scientist probably did the most to make TV possible by discovering electrons?
J.J. Thomson
The correct name for MgO is?
Magnesium Oxide
A compound has a empirical formula of NO2 and a molecular mass of 92 grams/mole. What is the molecular formula?
N2O4
list the 5/6 poly-atomic ions
Nitrate, Sulfate, Phosphate, Hydroxide, Carbonate, Ammonium.
What element on the periodic table would have the outermost configuration of 3P3?
Nitrogen
With n representing the outermost energy level, the electron configuration for elements in group 15 is-
P
A substance that is made up of molecules that have a partially positive and a partially negative end is ?
Polar*
How many protons, neutrons, and electrons are in a neutral atom of Si?
Protons: 14 Neutrons: 14 Electrons: 14
How many protons, neutrons, and electrons are in a neutral atom of oxygen?
Protons: 8 Neutrons: 8 Electrons: 8
Which one of Daltons ideas did not hold up?
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions.
What is the correct molecular shape of NH3?
Trigonal Pyramidal
Trigonal Planar
Usually with Boron, on a flat plane (BF3)
extra points: name the other two states of matter
bose-einstein and plasmas
Bonding between two elements of equal electronegativity would be:
diatomic
Bonding between two elements of equal electronegativity would be a
diatomic element
Whats the name of N2O4
dinitrogen tetraoxide
What is the most electronegative element on the periodic table?
fluorine
In chemical compounds, covalent bonds form when two what get together?
metal and a nonmetal*
ionic
metal and nonmetal
covalent
nonmetal and nonmetal
As atomic number increases:
number of electrons increases*
Isotopes of an element have different...
number of neutrons
Atomic #
number of protons
Atoms of the same element must have the same number of?
protons
CF4 is an example of what type of molecule?
tetrahedral
atomic mass
the weighted average of the masses of the isotopes of an element
NH3 is an example of what type of molecule?
triangular pyramidal
