Chemistry Test 1
How to name of ionic compound?
cation named first, anion named second
What is mass #?
# of protons and # of neutrons
What charge is Aluminum always?
+3
What charge do halogens have mostly?
-1
What charge do period 6A mostly have?
-2
What number of moles is equivalent to 7.03 ✕ 1021 atoms of Hg?
.0117 mol Hg
The density of chromium at 25°C is approximately 7.15 g/cm3. Express this value in lb/in3. (Note that 1 lb = 453.59237 g exactly, and 1 in = 2.54 cm exactly.)
.258 lb/in^3
The diameter of a biscuit is approximately 51 millimeters (mm). An atom of bismuth (Bi) is approximately 320. picometers (pm) in diameter. Calculate the number of bismuth atoms needed to span the diameter of a biscuit in a line. Express your answer in scientific notation, showing the correct number of significant figures. #23
1.6e+08 Bi atoms
What is the mass, in grams, of 5.64 moles of oxygen gas (O2)?
180 g
Calculate the formula mass of bromoform, CHBr3.
252.7 amu
How many moles of CO2 contain 3.01 ✕ 1024 molecules?
5.00 mol CO,2
What is the mass of 1.21 mol calcium oxide (CaO)?
67.9 g
How many molecules of fructose (C6H12O6) are present in 27.7 g of the substance?
9.26e+22 molecules
A compound has an empirical formula of CH2O and a molar mass of 150. g/mol. What is the molecular formula?
C,5H,10O,5
Oxalic acid, which is present in rhubarb, was found to consist of 26.68% C, 2.24% H, and 71.08% O by mass. Find the empirical formula for oxalic acid.
CHO,2
Ethylene dichloride, which is present in paint removers, was found to consist of 24.27% C, 4.07% H, and 71.65% Cl by mass. Find the empirical formula of ethylene dichloride.
CH_2Cl
What is a molecular compound?
a compound that begins with a nonmetal
CH,3COOH
acetic acid
Group 1A is known as ?
alkali metlas
Group 2A is known as?
alkaline earth metals
What is an element that can exist in several different and distinct forms each having its own?
allotropes, Carbon is an ex
What is the only polyatomic ion with a +1 charge?
ammonium
What is unit of formula mass?
amu
What is the compound w/o water?
anhydrous
C,6H,6
benzene
C,4H,10
butane
What is an ionic compound?
compound that beings with a metal
C,2H,6
ethane
CH,3CH,2OH
ethanol
What is the unit of mass?
grams
Group 7A is known as ?
halogens
What is substance composed of an inorganic salt and physiclally bound water?
hydrate
Which elements exist as diatomic/triatomic?
hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
What type of compounds consist of ions, atoms, or groups of atoms?
ionic compound
CH,4
methane
CH,3OH
methanol
What type of compounds consist of discrete molecules at the particulate level?
molecular compounds
How do you name negative ions?
monatomic anion: add -ide ending to stem name ex. Fluoride
How do you name positive ions?
name of metal plus word ion
Group 8A is known as ?
noble gases
What is the prefix for 9?
nona
What is atomic mass?
number on periodic table for mass
C,5H,12
pentane
What are the two polyatomic ions with a -3 charge?
phosphate, phosphite
C,3H,8
propane
What are monatomic ions?
single atoms that lost or gained electrons
What is the empirical formula?
smallest whole # ration of atoms present
What are the eight polyatomic ions with -2 charge?
sulfite, sulfate, carbonate, hydrogen phosphate, chromate, oxalate, silicate, dichromate
What is the prefix for 4?
tetra
What is the molecular formula?
the actual numbers of atoms present in a molecule
What does diatomic mean?
two atoms
Normal blood glucose concentrations range between 75 and 125 mg/dL. Blood glucose concentrations that drop below 40 mg/dL are considered life threatening. If a person's blood is tested and found to contain 2743 µg/mL glucose, should that person receive immediate medical attention? (1 L = 1 × 101 dL) #20
yes, it's way above normal range