Chapter 1
Is dissolving table salt in water a physical or a chemical change?
Physical
What is avogadros number used to find?
The number of atoms from a given mass
Which quantum number determines the shape of an orbital?
a. n
b. l
c. ml
d. ms
e. atomic number
a. n
What is the Capital of California?
Which sample is best classified as a homogeneous mixture?
a. Granite
b. Muddy river water
c. A solution of ethanol and water
d. Oil floating on water
e. Ice cubes in liquid water
c. A solution of ethanol and water.
Which species contains 18 electrons?
a. K
b. Ca+
c. Cl
d. S2-
e. Ar+
d. S2-
Which set of quantum numbers is allowed?
a. n = 3, l = 3, ml = 0, ms = +1/2
b. n = 5, l = 2, ml = -2, ms = -1/2
c. n = 2, l = 1, ml = +2, ms = +1/2
d. n = 4, l = -1, ml = 0, ms = -1/2
e. n = 1, l = 1, ml = 0, ms = +1/2
b. n=5, l=2, ml=-2,l ms=-1/2
Name any one of the five most streamed songs on Spotify
Blinding Lights by The Weeknd/Shape of You by Ed Sheeran/Sweater Weather by The Neighbourhood/Starboy by The Weeknd/As it Was by Harry Styles
Which process is a chemical change?
a. Melting solid iodine
b. Crushing a crystal of sodium chloride
c. Boiling liquid ethanol
d. Tarnishing a piece of silver
e. Dissolving table sugar in water
d. Tarnishing a piece of silver
How many atoms are in 25 grams of pure Titanium (Ti)
3.15*1023 atoms
An electron moves from n = 2 to n = 5. What occurs?
a. The electron loses energy and a photon is emitted.
b. The electron gains energy and a photon is absorbed.
c. The electron loses energy and a photon is absorbed.
d. The electron gains energy and a photon is emitted.
e. No energy change occurs
b. The electron gains energy and a photon is absorbed.
Which organelle is responsible for cleaning up waste inside a cell?
Lysosome
Explain the sig fig rules for multiplication/division AND addition/subtraction
M/D: Round your final answer to have the same number of significant figures as the measurement with the fewest significant figures.
A/S: Round your final answer to the same number of decimal places as the measurement with the fewest decimal places.
Which comparison is consistent with general periodic trends?
a. Na has a smaller atomic radius than Cl.
b. Mg has a lower first ionization energy than Na.
c. F has a larger atomic radius than O.
d. K has a larger atomic radius than Na.
e. A cation is always larger than its neutral atom
What is the electron configuration of Iodine using noble gas notation?
[Kr]5s24d105p5
What is the largest urban area in the world by population
Tokyo
A student measures the mass of a tungsten block with a volume of 5cm^3. They obtain measurements of 21.3 g, 90.5g, and 177g. Are these results accurate, precise, both, or neither? (The density of pure tungsten is 19.25 g/cm^3)
Accurate, not precise
We have a 30 gram sample of a certain element. If there are 8.95*1023 atoms in this sample, which element are we dealing with?
Neon
According to the Pauli Exclusion Principle, which statement is correct?
a. Electrons fill degenerate orbitals singly before pairing.
b. No two electrons in one atom can have the same four quantum numbers.
c. Electrons in higher shells always have lower energy.
d. Each p subshell contains five orbitals.
e. All paired electrons must have the same spin.
b. No two electrons in one tom can have the same four quantum numbers.
What is the derivative of sin(3x)
3cos(3x)