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1  +3 2014 sep 03convert grams to molesChemTeam: Grams to MolesIn chemistry, the mole is the standard measurement of amount. However ... There are three steps to converting grams of a substance to moles . Determine how ... ‎The Mole & Molar Mass - ‎Answers - ‎Molecular Weight - ‎Moles to Grams
1  +3 2014 aug 15grams to molesIn chemistry, the mole is the standard measurement of amount. However, balances DO NOT give readings in moles . Balances give readings in grams . So the ... ‎The Mole & Molar Mass - ‎Answers - ‎Molecular Weight - ‎Moles to Grams
1  +6 2014 aug 07g not converting toChemTeam: Moles to GramsBalances DO NOT give readings in moles. So the problem is that, when we compare amounts of one substance to another using moles, we must convert from ...
1  +9 2014 aug 06known given solutionCalculate the pH of a Saturated Solution When Given the KspPlease be aware that this problem does not require a concentration to be given in the problem. We know the Ksp and we know the solution is saturated.
1  +28 2014 jul 23g bond calculatorChemTeam: Hess' Law - using bond enthalpiesCalculate (in kJ) the standard enthalpy change ΔH for the hydrogenation of ethyne (acetylene) to ethane: H−C≡C−H( g ) + 2H2( g ) ---> H3C−CH3( g ). Bond  ...
2  +1 2014 sep 24nh3 h2oA review of Bronsted-Lowry Acid Base concepts - Chemteam.infoNH3 + H2O <===> NH4+ + OH¯. However, it is important to also consider the reverse equation, since this is an equilibrium. In this case, note that HB+ is the acid ...
2  +1 2014 sep 13molalityChemTeam: MolalityAs is clear from its name, molality involves moles. Boy, does it! The molality of a solution is calculated by taking the moles of solute and dividing by the kilograms  ...
2  ~ 2014 sep 13molar volumeChemTeam: Molar VolumeIt is actually known to several more decimal places but the number above should prove sufficient.This value has been known for about 200 years and it is not a ...
2  +6 2014 sep 01avogadro lawChemTeam: Gas Law - Avogadro's LawAvogadro's Law . Return to KMT & Gas Laws Menu. Discovered by Amedo Avogadro, of Avogadro's Hypothesis fame. The ChemTeam is not sure when, but  ...
2  +1 2014 jul 26mmhg to atmConverting between Units of Pressure: atm , mmHg and kPaOne atm . equals 760.0 mm Hg , so there will be a multiplication or division based on the direction of the change. Example #1: Convert 0.875 atm to mmHg .
2  +10 2014 jul 26properties of acidsThe Observable Properties of Acids and Bases - Chemteam.infoAcid Property #1: The word acid comes from the Latin word acere, which means " sour." All acids taste sour. Well known from ancient times were vinegar, sour ...
3  ~ 2014 sep 24assuming life of 　ChemTeam: Kinetics: first-order chemical reactionsProblem #1: Calculate half- life for first-order reaction if 68% of a substance is ... Assuming 0.0100 M, calculate the time in seconds required for the reaction to ...
3  +10 2014 aug 26std enthalpy of formationChemTeam: Hess' Law - using standard enthalpies of formationThe key to solving this problem is to have a table of standard enthalpies of formation handy. In case you missed it, look at the equation up near the top and see ...
3  +5 2014 aug 23henderson it solutionChemTeam: Henderson -Hasselbalch ProblemsReturn to a listing of many types of acid base problems and their solutions ... Solution : 1) Substitute into the Henderson -Hasselbalch Equation and solve:.
3  +10 2014 aug 15enthalpy of formation
4  -2 2014 sep 27heat of formation of s8 lStandard Enthalpy of Formation - ChemTeamThe standard enthalpy of formation for an element in its standard state is zero. ... This is the physical state (solid, liquid , or gas ) that a substance would be in ...
4  ~ 2014 sep 24boyle's law formulaChemTeam: Gas Law - Boyle's LawOn the continent of Europe, this law is attributed to Edme Mariotte, therefore those ... This equation of P1V1 = P2V2 will be very helpful in solving Boyle's Law  ...
4  +1 2014 sep 23r　ｍｍｈｇChemTeam: Gas Law - Ideal Gas LawLet the cube root of k1k2k3k4k5 / k6 be called R . ... R is called the gas constant. ... 2.1025 grams is found to occupy 2.850 L at 22.0°C and 740.0 mmHg .
4  +4 2014 sep 231 molChemTeam: The Mole & Molar MassAvogadro's Number has a unit associated with it. It is mol ¯ 1 , as in 6.022 x 1023 mol ¯ 1 . The superscripted minus one means the unit mol is in the denominator.
4  +94 2014 sep 10molecular weightChemTeam: Molecular WeightThe molecular weight of a substance is the weight in atomic mass units of all the atoms in a given formula. An atomic mass unit is defined as 1/12 the weight of ...
4  +26 2014 aug 22to add chemical productsChemTeam: Hess' Law - using two equations and their enthalpiesThe enthalpy of a given chemical reaction is constant, regardless of the reaction ... This will put the C (s, diamond) on the product side, where we need it. Also ...
4  ~ 2014 aug 12metric number lineMetric Prefixes - ChemTeamIn order to properly convert from one metric unit to another, you must have the prefixes ... Here is a number line with the two prefixes in problem sixteen marked: .
4  +9 2014 jul 28pressure units conversionConverting between Units of Pressure : atm, mmHg and kPaConverting between Units of Pressure : atm., mmHg and kPa. Return to KMT & Gas ... There are three different units of pressure used in chemistry. This is an ...
4  +2 2014 jul 26kpa to mmhgConverting between Units of Pressure: atm, mmHg and kPaHere they are: atmospheres (symbol = atm); millimeters of mercury (symbol = mm Hg ); Pascals (symbol = Pa) or, more commonly, kiloPascals (symbol = kPa ) ...
5  +4 2014 oct 01specific heat of waterChemTeam: Specific HeatThe specific heat is an important part of energy calculations since it tells you how much energy is needed to move ... Here are the specific heat values for water : ...
5  -2 2014 sep 29kj j hvTwo Light Equations: Part Two - E = hν - ChemTeamProblem #2: How many Joules of energy are contained in a photon with λ = 550 nm? How many kJ /mol of energy is this? Solution: I will first do the problem step ...
5  -1 2014 sep 21stock systemeChemTeam: Nomenclature-Binary Compounds: StockBinary Compounds of Cations with Variable Charges. Given Formula, Write the Name. The Stock System . Return to Nomenclature menu ...
5  +25 2014 aug 28grams to mlChemTeam: Calculating the Ksp from gram per 100 mL solubilitySometimes, the solubility is given in grams per 100 mL , rather than molar solubility. The Ksp can still be calculated from these data, but indirectly. First, we have ...
5  +4 2014 aug 27specific heat formulaChemTeam: How to Determine Specific HeatWe are going to determine the specific heat of copper metal. Now this has already been done many times, so the value is available in reference books. We will ...
5  +8 2014 aug 25balancing half reactionsChemTeam: Balancing half-reactions in basic solutionReminder: a half - reaction MUST be balanced both for atoms and charge in order to be correct. It is VERY easy to balance for atoms only, forgetting to check the ...
5  +17 2014 jul 24sodium phosphate formulaGiven Name, Write the Formula - ChemTeamThat means, if you see a formula like BaSO4, the name is not barium monosulfur tetraoxide. Another ... Example #4 - write the formula for sodium phosphate .
6  +1 2014 sep 16specific heat
6  +3 2014 sep 12calculate enthalpy changeChemTeam: Hess' Law - using three equations and their enthalpiesCalculate the standard enthalpy of formation of gaseous diborane (B2H6) using the following .... Calculate the enthalpy change for the reaction below: ...
6  +6 2014 sep 10nomenclature practiceChemTeam: Chemical NomenclatureTutorials and Problem Sets. Tutorials. Binary Compound (Metal/Nonmetal) with Fixed Charge Cation. Given Formula, Write the Name · Given Name, Write the ...
6  +11 2014 sep 05degrees celsius figureChemTeam: Converting between Celsius and KelvinIf you have a Celsius temperature in the problem, you MUST change it to Kelvin, in order to use it in ... very often in gas law problems it looks like significant figure rules are being violated. ... Last point: never, ever, use a degree sign on Kelvins.
6  +4 2014 sep 03c to kConverting between Celsius and Kelvin . Return to KMT & Gas Laws Menu. There are not any high school level gas law problems that the ChemTeam is aware ...
6  +19 2014 aug 26pure substances and mixturesChemTeam: Mixtures and Pure SubstancesA mixture is one in which two or more pure substances retain their chemical identity. For example, if you dissolve some sugar into water, the sugar molecules  ...
6  +6 2014 aug 24heat fusion waterChemTeam: Molar Heat of FusionSometimes the unit J/g is used. The first unit is technically the more correct unit to use. The molar heat of fusion for water is 6.02 kJ/mol. Remember the value!
6  +5 2014 aug 05wavelength to frequencyCalculate the frequency when given the wavelength - Chemteam.infoProblem #1a: Calculate the frequency of radiation with a wavelength of 442 nm. Example #1b: The wavelength of an argon laser's output is 488.0 nm. Calculate ...
6  +6 2014 jul 26heat of vaporizationChemTeam: Molar Heat of VaporizationKeep in mind the fact that this is a very specific value. It is only for one mole of substance boiling. The molar heat of vaporization is an important part of energy ...
6  +15 2014 jul 21calculate the solubilityChemTeam: Calculating gram per 100 mL solubility , given the KspBasically, this type of problem will (1) calculate the molar solubility from the Ksp. Then, in an additional step, (2) calculate grams per liter from moles per liter.
7  -6 2014 sep 22you remain half hourChemTeam: Half -Life Problems: Part One(1/2)number of half -lives is the decimal fraction which remains (1.000 is the original starting amount, 0.500 at the end of ... 3) Os-182 has a half -life of 21.5 hours .
7  -1 2014 sep 14density of gasChemTeam: Gas DensityDiscussing gas density is slightly more complex than discussing solid/liquid density . Since gas volume is VERY responsive to temperature and pressure, these ...
7  ~ 2014 sep 12step by step enthanply changeGo to Hess' Law - using standard enthalpies of formation
7  +62 2014 sep 09redoxRedox menu - Chemteam.infoTutorials and Problem Sets. Tutorials & Problem Sets. The Meaning of Redox · The Rules Governing Oxidation Numbers · What is a Half-Reaction? Balancing ...
7  +29 2014 sep 05ion equitaionChemTeam: Equations : Complete Molecular, Complete Ionic and To transform a complete molecular equation to a complete ionic equation , you need to know the difference between an ionic compound and a molecular ...
7  +27 2014 sep 03density gas
7  +10 2014 aug 28charge of electronDetermination of the Charge on an Electron - Chemteam.infoI. Pre-History. The charge on electron was first measured by J.J. Thomson and two co-workers (J.S.E. Townsend and H.A. Wilson), starting in 1897. Each used a  ...
7  +20 2014 aug 26kelvin to celsius
7  +31 2014 aug 10elements forming negative ionsChemTeam: Which Elements form Ionic Bonds?The positive/ negative charge attraction would hold the two ions together. ... The other elements in this column exhibit such complex patterns of behavior that they  ...
8  +4 2014 sep 27freezing xChemTeam: Freezing Point Depression ProblemsExample #1: Calculate the freezing point of a solution of 5.00 g of diphenyl ... x is the molecular weight of Vitamin K, 0.500 and 4.43 are from the problem and ...
8  +1 2014 sep 24physical changeChemTeam: Physical and Chemical ChangesI. Physical Changes . A physical change is any change NOT involving a change in the substance's chemical identity. Here are some examples: (1) any phase ...
8  -4 2014 sep 24ca oh 2ChemTeam: Calculate Ksp when Given Titration DataProblem #1: A solid sample of Ca ( OH ) 2 is shaken with 0.0100 M CaCl2. Once equilibrated, some solid Ca ( OH ) 2 remains undissolved. The solution is filtered ...
8  ~ 2014 sep 14bond energy and estemationHydrogen and chlorine have different influences on the electron density in the carbon-carbon bond and that has an influence on how much energy it takes to ...
8  +14 2014 aug 25how to balance equationsChemTeam: Balancing Chemical EquationsBalancing Chemical Equations . Return to Equations Menu. Chemical equations do not come already balanced . This must be done before the equation can be ...
8  +3 2014 aug 24ionization of waterChemTeam: Kw: The water ionization constantKw: The water ionization constant. Return to the Acid Base menu. Important note: all constants refered to: Kc, Kw, Ka, and Kb are temperature-dependent.
8  +93 2014 aug 24net ionic equation solverEquations : Complete Molecular, Complete Ionic and Net IonicIons (never words) will be used for the complete ionic equation and the net ionic equation , which will follow just below. You can use words for an ionic equation ...
8  +15 2014 aug 21molar mass of copperChemTeam: Calculate empirical formula when given mass dataProblem #1: A sample of copper metal weighing 2.50 g is heated to form an ... Problem #2: On analysis, a compound with molar mass 60 g/mol was found to ...
8  +1 2014 aug 17convert to ppmChemTeam: Converting between " ppm " and molarityThis last one works because the solution concentration is so low that we can assume the solution density to be 1.00 g/mL. Also, it's this last modification of ppm  ...
8  ~ 2014 jul 27how to balanceChemical equations do not come already balanced . This must be done before the equation can be used in a chemically meaningful way. All chemical ...
9  -2 2014 oct 03effect of temperatureThe Effect of Temperature on the Position of the Equilibrium and the The Effect of Temperature on the Position of the Equilibrium and the Keq. Go back to Equilibrium menu. Example #1: H2(g) + Cl2(g) <==> 2HCl(g) + heat.
9  -1 2014 sep 28strong acid against strong baseChemTeam: Strong acid and strong base titrationsReturn to a listing of many types of acid base problems and their solutions · Return to the ... Ba(OH)2 is a strong base , so it dissociates 100%. Remember also ...
9  -3 2014 sep 23nh4 oh nh3NH3 + H2O <===> NH4+ + OH ¯. However, it is important to also consider the reverse equation, since this is an equilibrium. In this case, note that HB+ is the acid ...
9  +7 2014 sep 16products of combustionChemTeam: CombustionDO NOT just copy the subscripts from the reactants over into the products . Combustion , at its most general, can mean the reaction of oxygen gas (O2) with ...
9  +5 2014 jul 30atm to pascal conversionHere they are: atmospheres (symbol = atm ); millimeters of mercury (symbol = mm Hg); Pascals (symbol = Pa ) or, more commonly, kiloPascals (symbol = kPa) ...
9  +56 2014 jul 24calorimetr constant lab calculationsHow to Calculate a Calorimeter Constant - ChemTeamHere is an answer on Yahoo Answers - Chemistry about how one goes about determining a calorimeter constant . Here are two videos which each discuss the  ...
9  +4 2014 jul 18gas density calculatorDiscussing gas density is slightly more complex than discussing solid/liquid density . Since gas volume ... You can calculate the standard gas density fairly easily.
10  -3 2014 oct 05high school chemistryChemTeam: Main MenuWelcome to the ChemTeam. A Tutorial for High School Chemistry . The ChemTeam provides study resources in all standard topics for students in high school ...
10  -5 2014 oct 02mmhg a paHere they are: atmospheres (symbol = atm); millimeters of mercury (symbol = mm Hg ); Pascals (symbol = Pa ) or, more commonly, kiloPascals (symbol = kPa) ...
10  +2 2014 sep 27enthalpy change formulaI'll explain the above equation using an example problem. .... Problem #7: The standard enthalpy change , ΔH°, for the thermal decomposition of silver nitrate ...
10  +24 2014 sep 20heating curveChemTeam: Time-Temperature GraphWe are going to heat a container that has 72.0 grams of ice (no liquid water yet!) in it. To make the illustration simple, please consider that 100% of the heat  ...
10  +1 2014 sep 16pv nrtPV = nRT : The Ideal Gas Law. Problem Set #1 ... For a static sample of gas, we can write each of the six gas laws as follows: PV = k1. V / T = k2. P / T = k3
10  +3 2014 sep 11solubility rules chartSolubility Table - ChemTeamThese rules are general and qualitative in nature. Each rule has exceptions and the important ones are noted. The most common definition for solubility is this:.
10  +9 2014 aug 26metric system challenge worksheetChemTeam: Metric SystemMetric Unit to Another (10 probs) · Converting two metric units (numerator and denominator) at a time (10 probs) · Converting Metric Square ...
10  +11 2014 aug 20elements and compoundsChemTeam: Elements and CompoundsI would like to lead into discussing elements and compounds by first considering a general classification scheme for all matter. The word "matter" describes ...
10  +7 2014 aug 15john dalton atomic theoryChemTeam: Atomic Structure - DaltonJohn Dalton (1766-1844): The Father of the Chemical Atomic Theory . Return to Atomic ... The path that Dalton took to the chemical atomic theory is complex.
10  +15 2014 aug 13ml in gChemTeam Video: Convert g / mL to g /m^3, then to kg/m^3ChemTeam Video: Convert g / mL to g /m3, then to kg/m3.
10  +9 2014 jul 22phone number name formulaChemTeam: Nomenclature-PolyatomicGiven Formula , Write the Name ... That means, if you see a formula like BaSO4, the name is not barium monosulfur ... How do you know your phone number ?
11  +1 2014 sep 29how many gramsGo to Answers - ChemTeamHow many grams of KCl is produced from 2.50 g of K and excess Cl2. From 1.00 g of Cl2 and excess K? 4. Given the following equation: Na2O + H2O ---> 2 ...
11  +1 2014 sep 28solubility rulesChemTeam: Solubility RulesGeneral Rules of Solubility . Return to Solutions Menu. The dividing line between soluble and insoluble is 0.1-molar at 25 °C. Any substance that can form 0.1 M ...
11  -5 2014 sep 26html scientific notationChemTeam: Scientific NotationThe trade-off, of course, is that you have to be able to read scientific notation as well as convert between scientific notation and standard notation (also called ...
11  +74 2014 sep 09hydrolysisChemTeam: Introduction to hydrolysis calculationsThe other two (salt of strong acid and salt of strong base) are ignored or lightly treated. Hydrolysis calculations are best understood in terms of acid base ...
11  +20 2014 sep 07signifigant figures additionChemTeam: Math With Significant FiguresMath With Significant Figures Addition and Subtraction. Return to Significant Figures Menu. In mathematical operations involving significant figures , the answer ...
11  +29 2014 aug 27how to find radiationProblem #1a: Calculate the frequency of radiation with a wavelength of 442 nm. Example #1b: The ... 2) Use λν = c to determine the frequency: (67.5 x 10-6 m) ...
11  +24 2014 aug 15balance chemical equationsChemical equations do not come already balanced . This must be done before the equation can be used in a chemically meaningful way. All chemical  ...
11  +65 2014 aug 15specific heat capacityWe are going to determine the specific heat of copper metal. ... mL of water at 25.0 °C. The calorimeter heat capacity is 1.23 J/K. Given that the final temperature ...
11  +44 2014 aug 14temperature of iceChemTeam: Time- Temperature GraphThe Time- Temperature Graph. Return to Thermochemistry Menu. We are going to heat a container that has 72.0 grams of ice (no liquid water yet!) in it. To make ...
11  +22 2014 aug 14g in mlChemTeam Video: Convert g / mL to g/m^3, then to kg/m^3ChemTeam Video: Convert g / mL to g/m3, then to kg/m3.
11  +4 2014 jul 29density of silverGo to Answers for Density Problems #1-10 - Chemteam.infoGo to Density Problems #11-20 ... From this information, calculate the density of mercury. d = 306.0 g / 22.5 mL ... The density of silver is 10.5 g/cm3. d = g / cm3.
12  -4 2014 oct 01kelvin in celsius
12  ~ 2014 sep 30ideal gas lawThe Ideal Gas Law was first written in 1834 by Emil Clapeyron. This is just one way to "derive" the Ideal Gas Law : For a static sample of gas, we can write each of ...
12  +3 2014 sep 22gas density formula
12  +1 2014 sep 21oxidation number rulesRules for assigning oxidation numbers - Chemteam.infoWith only a very few exceptions, oxidation states can be assigned to all atoms in a formula. There are more extensive sets of rules and, for the most part, they ...
12  ~ 2014 sep 21molecular weight calculatorThe molecular weight of a substance is the weight in atomic mass units of all the ... of each element are in a substance in order to calculate its molecular weight .
12  -1 2014 sep 17chemical change
12  -1 2014 sep 10nonpolar covalent bondElectronegativity and Bond Type - ChemTeamI. Nonpolar Covalent : This type of bond occurs when there is equal sharing ( between the two atoms) of the electrons in the bond . Molecules such as Cl2, H2 and ...
12  +20 2014 sep 01another 3 kilosMetric Prefixes - Chemteam.infoIn order to properly convert from one metric unit to another , you must have the ... do the distance between kilo and centi by comparing the exponents of positive 3  ...
12  +20 2014 aug 22heat of formation tableStandard Enthalpy of Formation - Chemteam.infoThe standard enthalpy of formation for an element in its standard state is zero. ... One hint: there will be a table of standard enthalpies of formation somewhere in ...
12  +23 2014 aug 21molar mass airfairly easily. Just take the mass of one mole of the gas and divide by the molar volume. ... Comment: For both solutions, we need the " molecular weight" of air :.
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