Chem 104
Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced? 4Fe+3O2 --> 2Fe2O3
2 moles of Fe2O3/ 3 moles of O2
What are the coefficients that are required to balance the following equation Al(s)+H2SO4(aq) --> Al2(SO4)3(aq)+H2(g)
2,3,1,3
What is the molarity of a solution that contains 17g of NH3 in 0.50 L of solution
2.0 M
How many moles of H2O are found in 40.0g of H2O
2.22 moles of H2O you use the atomic mass number H2: 1.008x2=2.016 O: 16.00 add together=18.016..... you then take the 40.0 and divide by 18.016 this equals 2.22 moles of H2O
0.400 mole of sucrose, C12H22O11, contains ________ C atoms.
2.89 x 10^24
What is the concentration, in mass percent (m/m), of a solution prepared from 50.0g NaCl and 150.0g of water
25.0%
Which of the following gives the balanced equation for this reaction: K3PO4+Ca(NO3)2 --> Ca3(PO4)2+KNO3
2K3PO4+3Ca(NO3)2 --> Ca2(PO4)2+6KNO3
For the following reaction, what is the correct coefficient for H2 when the equation is balanced Fe+HCl --> FeCl3+H2
3
How many moles of water H2O, are present in 75.0 g H2O
4.17
At STP, what is the volume of 2.00 mole of carbon dioxide
44.8 L
A gas sample in a closed, expandable container of initial volume 5.00 L was allowed to warm from 25 C to 35 C. What is its new volume
5.17 L
How do you write the number .000571 in scientific notation?
5.71×10^-4
In the reaction of nitrogen gas, N2 with hydrogen gas H2 to form ammonia gas NH3 . How many moles of hydrogen are needed to react with 2 moles of nitrogen: N2+3H2 --> 2NH3
6 moles
One mole of particles of any substance contains how many particles?
6.02 x 10^23
What mass of KCl is in 350 mL of 0.24 M KCl?
6.3 g
A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 °C. What is the volume of the bubble when it reaches the surface where the pressure is 1.0 atm and the temperature is 27 °C?
630 mL
Find the mass of AlCl3 that is produced when 25.0 g of Al2O3 reacts with HCl according to the following equation: Al2O3+6HCl --> 2AlCl3+3H2O
65.4 g
How many protons and electrons does the O^2- ion have
8 protons and 10 electrons
what is the correct full atomic symbol for an atom that has 35 protons and 46 neutrons?
81/35 Br
In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100g of silver nitrate when it is mixed with an excess of sodium chloride? AgNO3+NaCl --> AgCl+NaNO3
84.4 g
The correct formula for a compound formed from the elements Al and O is
Al2O3
What is the correct formula for the ionic compound formed between the following ions Al^3+ and S^2-
Al2S3
place the following elements in order of decreasing atomic radius
P, Cl, N
which is the correct formula for the phosphite ion
PO3^3-
Arrange the following atoms in order of increasing electronegativity
S Cl F
Which of the following are correct formulas of the ion of each element listed
Flourine=F^1- Sodium=Na^1+
What is the formula for the nitride ion
N^3-
Water is a polar solvent and hexane is a nonpolar solvent. Which of the following correctly describes the solubility of the solute in the given solvent
NaHCO3, soluble in water
Oxidation-Reduction mnemonic
OIL RIG Oxidation is Loss Reduction is Gain
What is the correct formula for the oxide ion
O^2-
Which of the following identifies the correct number of significant figures?
0.00103 m has 3 significant figures
What is the answer to the following problem with the correct number of sig figs? 2.5x0.621/8.42×20.0
0.0092
A 10.0 mL of 0.121 M H2SO4 is neutralized by 17.1 mL of KOH solution. The molarity of the KOH solution is
0.142 M
What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200 M solution to a final volume of 100 mL
0.150 M
How many grams of hydrogen are needed to produce 1.80 g of water according to this equation: 2H2+O2 --> 2H2O
0.202g
Complete the following equality: 1s=___ ¿s
1,000,000 ¿s
How many CO2 molecules are in 0.0180 moles of CO2
1.08x10^22 molecules of CO2
How many moles of C atoms are found in 0.185 moles of C6H14O
1.11 moles of carbon you take the 6 C and multiply by 0.185
What is the pH of a solution with [OH-]=1×10^-4 M
10.0
A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 mmHg and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in torr?
1100 torr
A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mmHg?
1140 mm Hg
At 570. mm Hg and 25°C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at a volume of 1250 mL and a temperature of 175°C?
1560 mm Hg
How do you round the number 1570 to 2 sig figs?
1600
What is the molar mass of sodium phosphate
164.0 g/mol
The [H3O+] of a solution with pH=2.0 is. ________
1x10^-2 M
What is the [OH-] in a solution that has a [H3O+]=1×10^-6 M
1x10^-8 M
The daily dose of ampicillin for the treatment of an ear infection is 140mg/kg of body weight. What is the daily dose for a 47.5 lb child? give answer with correct sig figs.
2
What is the molar mass of Fe(ClO4)3
354.2 g/mol
The molar mass of potassium is _________
39.1 g/mol
A temperature of 125 C is the same as ______?
398 K you take the C temp and add 273 to get Kelvin
The name of the Cu+ ion is ________
Copper(I)
list the elements in order of increasing ionization energy
Cs, K, Na
what is the correct formula for the ionic compound for copper(I) oxide
Cu2O
Which of the following molecules can undergo hydrogen bonding force between 2 molecules
H2O
The correct formula for sulfuric acid is _____
H2SO4
The conjugate acid of H2O is ______
H3O+
Which of the following compounds contains a polar covalent bond
HCl
What is the symbol for the ion with 19 protons and 18 electrons?
K+
Which of the following elements has 2 valence electrons
Magnesium
The compound MgCl2 is named ________
Magnesium Chloride
In this reaction, what is the substance oxidized? Zn+2HCl --> ZnCl2+H2
Zinc
What are combustion reactions?
a carbon containing compound, usually a fuel, burns in oxygen from the air to produce carbon dioxide (CO2), water (H2O), and energy in the form of heat or a flame
The carbon tetrachloride molecule, CCl4, is _______
a nonpolar molecule with polar bonds.
The solubility of Kl is 50g in 100g of H2O at 20 C. If 110g of Kl are added to 200g of H2O ________
a saturated solution will form
Electrons can move to a higher energy level when they ______ light
absorb
which of the following elements are metals
aluminum and zinc
According to the Arrhenius concept, if HNO3 were dissolved in water, it would act as ________
an acid
In a neutralization reaction ________
an acid and a base react to form salt and water
Which of the following atoms has the largest atomic radius
calcium
In a solution, the solvent _______
can be a solid, liquid, or gas
The correct name for the compound N2O3 is ________
dinitrogen trioxide
which of the following statements are true
electrons repel each other, a proton and an electron have opposite charges, the nucleus contains most of the mass of an atom
What are replacement reactions
elements in a compound are replaced by other elements
What is the base unit for the measurement of mass in the metric system?
gram
An ionic compound
has a net charge of zero
The name given to an aqueous solution of HCl is _______
hydrochloric acid
The main type of interaction between molecules of ammonia (NH3) are _____
hydrogen bonds
Fe2(SO4)3 is called
iron (III) sulfate
Which of the following elemental symbol pairs is wrong
iron, Ir
How many electrons will aluminium gain or lose when it forms an ion
lose 3
In ionic compounds, _________ lose their valence electrons to form positively charged _______________
metals cations
The force of gas particles against the walls of a container is called
pressure
Which one of the following is a characteristic of an acid
produces H3O+ in water
In an oxidation-reduction reaction, the substance reduced always ______
shows a gain of electrons
What is the classification for this unbalanced reaction? Fe+HCl --> FeCl3+H2
single replacement
In replacement reactions: single replacement vs double replacement
single: one element replaces another element. double: 2 elements replace each other
A mixture is prepared by dissolving 2 g of KCl in 100 g of H2O. In this mixture, H2O is the ________.
solvent
what is the correct name of the following covalent compound: P4S3
tetraphosphorus trisulfide
which of the following names and formula pairs are correct
tin oxide, magnesium chloride, lithium nitride, strontium bromide
The molecular shape of the ammonia molecule NH3 is __________
trigonal pyramidal
Using VSEPR, what is the molecular shape of nitrogen trichloride
trigonal pyramidal
What is a combination reaction
when 2 or more elements or compounds bond to form one product
What is a decomposition reaction?
when a reactant is splits into 2 or more simpler products