1EXAM- HChem Flashcards
What is the N, A, and S number of H2O2?
20, 14, 6
What is the N, A, and S number of SO3?
32, 24, 8
What is the N, A, and S number of BCl3?
30, 34, 6
Name this compound: HCl
Hydrochloric Acid
Name this compound: CuCl2
Copper (II) Chloride
Name this compound: CO
Carbon Monoxide
Name this compound: HClO4(aq)
Perchloric Acid
Name this compound: SiBr4
Silicon Tetrabromide
Write the formula for this compound: Tin (II) fluoride
SnF2
Write the formula for this compound: Hydroiodic Acid
HI(aq)
Write the formula for this compound: diphosphorus pentoxide
P2O5
How many atoms are in 4.0 x 10^-5 g of aluminum?
8.9 x 10^17
What is the molar mass of (NH4)3PO4?
149.0 g/mol
How many hydrogen atoms are in one molecule of (NH4)2PO4?
8
What is the percent composition of hydrogen in water?
11%
What is the percent nitrogen (by mass) in (NH4)2CO3?
29.2%
What is the molar mass of CO2?
44.0 amu
What is the molar mass of NaOCl?
74.5 amu
What is the molar mass of Ca(OH)2?
74.1 amu
Find the percent composition of each element in he compound: H2SO4
H = 2.0%, S = 32.7%, O = 65.2%
Find the percent composition of each element in he compound: CO2
C = 27.3%, O = 72.7%
Find the percent composition of each element in he compound: Al2S3
Al = 35.9%, S = 64.1%
Copper has two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu. What is the weighted average mass of the two isotopes?
63.55 amu
The identity of an atom is determined by the number of
Protons
The number of protons and neutrons combined is the
Atomic mass
Isotopes have the same number of _____, but a different number of ______
Protons, neutrons
The number of protons is called the
Atomic number
Janet, how do you spell the element F?
Fluorine
What’s the symbol for tin
Sn
What’s the symbol for silver
Ag
What’s the symbol for strontium
Sr
What’s the symbol for iron
Fe
What element is Cd
Cadmium
What element is V
Vanadium
What element is Y?
Yttrium
What do all nickel atoms have in common?
The same atomic number
How is the charge of an ion determined?
If the number of electrons is greater or lesser than the protons?
In a nuclide symbol, of he mass number and atomic number, which is on top and which is on the bottom?
The mass number is on the top and the atomic number is on the bottom
Is length an intensive or extensive property?
Extensive
Is hardness an intensive or extensive property?
Intensive
Give some examples of intensive properties, and then extensive
I - density, malleable, boing point
E - length, volume, mass
Give some examples of physical properties
Ductile, conductive, malleable
Is age extensive or intensive? Gender.
Extensive, intensive
Chemical or physical change? Lighting a match
C
Chemical or physical change? Making paper from wood
C
Chemical or physical change? Frying an egg
C
Chemical or physical change? Boiling water to make Mac n Cheese
P
Chemical or physical change? Making chex mix
P
Pure substance or mixture? Purified air
M
Pure substance or mixture? Element or compound?Sucrose
PS, compound
Homogenous or Heterogenous? Wood
Heterogenous
Homogenous or Heterogenous? Milk
Homogenous
Homogenous or Heterogenous? Dirt
Heterogenous
Homogenous or Heterogenous? Black coffee
Homogenous
How many significant figures? 0.000983
3
How many significant figures? 6.023 x 10^23
4
How many significant figures? 2.0 x 10^-3
2
How many significant figures? 3.456110
7
How many significant figures? 12700.00
7
How many significant figures? 12,700
3
What wavelength corresponds to a frequency of 6.25 x 10^9 Hz?
.0480 m
What is the correct electron configuration for nitrogen?
1s2, 2s2, 2p3
Write the long form electron configuration for potassium
1s2, 2s2, 2p6, 3s2, 3p6, 4s1
What is the frequency for a wavelength of 440 nm?
6.8 x 10^14 Hz
What is empirical form
The simplest reduced form
What is molecular form
The actual number of atoms in a compound
What type of acid do you write “hydro” at the beginning of the name?
Binary acids
What type of compound name do you use prefixes in?
Covalent
How do you identify an oxyacid?
They will be made of three elements: H, O, and a third element
What must an element be to be a binary or oxyacid?
(aq)
In oxyacids, what means 1 extra O? 1 less? 2 less?
per + stem + ic, stem + ous, hypo + stem + ous
What are the type 2?
“d-block”, tin, lead
What must any acid begin with?
H
Prefix for 7?
Hepta
Prefix for 4?
Tetra
How many dots can be on a side in an electron dot diagram?
2
What is the bond hybridization of a water molecule?
sp3
What word describes how electrons are involved in ionic bonding?
Transferred
Draw some lewis structures, determine if they are polar, classify them, tell the bond hybridization
Can’t really put that in notecards
What are the three types of bonding between molecules?
Hydrogen bonding, dipole-dipole, vanderwaals
What type of bonding do all molecules have?
Vanderwaals
How do you determine a polar molecule?
One or more line pairs on the central atom, different atoms connected to the central atom
Study periodic table trends
They are probably way better to study visually anyway
Classify the bond: Na — Cl
Ionic
Classify the bond: Cu — O
Polar covalent
Classify the bond: Cs — F
Ionic
Classify the bond: Cl — Cl
Pure covalent
C = ?
2.998 x 10^8 m/s
H = ?
6.626 x 10^-34 J • s
Atoms release energy when they jump to higher energy levels, true or false?
True
Electrons give off energy in finite amounts called
Quantums
Sublevels are divided into
Orbitals
Each orbital can hold up to ____ electrons
2
Electrons give off energy in the form of a _____ when returning to the ground state
Photon
What scientist proposed the idea that electrons travel in fixed paths?
Bohr
When an electron moves to the ground state, energy is ______
Absorbed
No two electrons can have the same four quantum numbers. True or false?
True
What does the primary quantum number tell you?
What energy level the electron is in
Why do electrons move?
To achieve stability
Half filled orbitals are more stable than partially filled, T or F?
True
Know crest, trough, wavelength, and amplitude
🍕
Amplitude establishes ________
Wavelength establishes __________
Intensity of shade, color
Light travels on ______ waves
Transverse
OIL RIG means what
Oxidation Is Loss, Reduction Is Gain
If an element has three letters it is
Man made
