Why can t you dissolve a solid solute in the full volume of desired solvent when making a solution?
For example, say I want to make 300ml of a 2M solution. Why do I have to dissolve the solute in 250ml first and then add the remaining 50ml after?...View details
I need some help answer this questions.Its my study gudie.i have a test tmrw.?View details
Dimethylnitrosamine (CH3)2 N2 O is a carcinogenic substance that may be formed in foods, beverages or gastric juices from the reaction?
what is the molar mass of dimethylnitrosamine? what is the mass of 0.050 mole of dimethylnitrosamine ? how many atoms of hydrogen are 1.0 mole of dimethylnitrosamine?...View details
Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic calculate the molar mass of chloral hydrate?
what amount (moles) of C2H3Cl3O2 molecules are in 500.0 g chloral hydrate? what is the mass in gram of 2.0 *10^-2 mole of chloral hydrate?...View details
What is P5F9's chemical name?View details
Why does successful collision of some particles doesn't require proper orientation like in combination of two H atoms?View details
Arrange from strongest to weakest attraction: a) polar and polar b) nonpolar and nonpolar c) polar molecule and ion d) ion and ion?View details
The Society of Automotive Engineers has established an accepted numerical scale to measure the viscosity of motor oil.?
For example, SAE 40 motor oil has a higher viscosity than an SAE 10 oil. Rank the following hydrocarbons by their expected viscosity.Rank from most to least viscous. CH3CH2CH2CH2C...View details
What is the molarity of p-nitroaniline in a solution if the absorbance is 0.59 assuming a path length of 1.00 cm? Include units in answer?View details
Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g), a)The reaction is started with 40.0 g of Fe2O3 and 60.0 g of CO. Indicate the limiting reagent.?
4. Iron ore containing Fe2O3 is converted into iron according to the following reaction: Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g) a) The reaction is started with 40.0 g of Fe2O3 and...View details
What mass of NaOH is needed to precipitate the Cd2+ ions from 36.0 mL of 0.450 M Cd(NO3)2 solution?...View details
Three 1.0-L flasks, maintained at 308 K, are connected to each other with stopcocks. Initially the stopcocks are closed. One of the flasks contains 1.5 atm of N2, the second 5.0 g ...View details
If 22.5 g of lithium and 33.0 g of bromine are present at the beginning of the reaction find the excess reactant and the mass in excess?
Balanced Formula 2 Li + Br2 → 2 LiBr Also the mass of lithium bromide produced...View details
How long would it take for 1.50 mol of water at 100.0 ∘C to be converted completely into steam?
if heat were added at a constant rate of 20.0 J/s ?...View details
Suppose that 1.02 g of rubbing alcohol (C3H8O) evaporates from a 72.0 g aluminum block.?
If the aluminum block is initially at 25 ∘C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization o...View details
How much heat is evolved in converting 1.00 mol of steam at 160.0 ∘C to ice at -50.0 ∘C?
The heat capacity of steam is 2.01 J/(g⋅∘C) and of ice is 2.09 J/(g⋅∘C)....View details
A mixture containing 21.3 g of ice (at exactly 0.00 ∘C) and 70.2 g of water (at 52.4 ∘C) is placed in an insulated container.?
Assuming no loss of heat to the surroundings, what is the final temperature of the mixture...View details
How is the average kinetic energy of water molecules affected when you pour hot water into cups at lower temperature as the water?View details
Oxides of virtually every element are known. Bromine, for example, forms several oxides when treated with ozone.?
Oxides of virtually every element are known. Bromine, for example, forms several oxides when treated with ozone. Suppose you allow 1.550 g of bromine, Br2, to react with ozone and...View details
How many moles of carbon dioxide (CO2) will occupy 5.5 L at 5.0°C and 0.74 atm?View details
How does an atom borrow an electron when it doesn't have 8 valence electrons? Please show example?View details
What is the total mass of mercury in the tank?
A water holding tank measures 105 m long, 50 m wide, and 8 m deep. Traces of mercury have been found in the tank, with a concen- tration of 60 mg/L. What is the total mass of mercu...View details
A 152 g metal bar requires 2.50 kJ to change its temperature from 30.5 oC to 100.0 oC. What is the specific heat of the metal?View details
Please help with this following question: Which of the following factors can result in an increase in the entropy of a system? 1. An increase in temperature 2. A decrease in temp...View details
Introduction To Chemistry Pre Lab Questions , Please Help Me , Its my first time doing it?View details
Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g) given the following reactions and enthalpies of formation:?View details
All the following compounds are members of the same class of compounds. What is the general name of that class?View details
Which of the following is a secondary amine?View details
How to graphically determine freezing point?
I have data from a lab for the cooling curve of a substance. The problem is, the "flat" portion of the graph (the freezing) is not completely flat and still decreases in temperatur...View details
Where did the 760 mm Hg come from?
The question asks to find the pressure of mercury gas in mm. It has 0.697 mol of neon gas at a temperature of 21.0 degrees celcius and t occupies 20.6 liters. I understand how th...View details
Perovskite is a compound with a cubic unit cell and has a strontium atom at the center of the cell, titanium atoms at the corners of the unit cell, and oxygen atoms at the centers ...View details
What is the chemical formula for Strontium Tungstate Dihydrate?View details
Can someone one help with a chemistry problem considering the following reaction: 3Fe + 4H2O → Fe3O4 + 4H2?View details
How can i synthesize 4,4'-Methylenedianiline?View details
If 2.72 mol of ethane (C2H6) undergo combus- tion according to the unbalanced equation C2H6+O2→CO2+H2O, how many moles of H2O is required?View details
If you started with 0.234 grams of Na2S2O3 how many grams of sulphur was produced? Can u please show steps too?View details
How do you determine molality of a substance, when given density, molarity, and molar mass?
I understand how to solve the problem if I am given a volume for the substance, but I dont understand how to calculate it with the given information. Density= 1.17g/ml M=0.464 Mo...View details
Please help with chemistry?
Rutherford created a planetary model for atoms after his experiments. Imagine if Rutherford's idea that electrons radiate energy while orbiting around a nucleus was true. Which oth...View details
Plzz help with this chem problem?
a sample of carbon dioxide that initially at 77.0 c was heated to 154 c if the volume of the carbon monoxide sample at 154 c is 766.9 ml what was its volume at 77.0 c...View details
Using suitable equation show solubility of PbI2 will change in acidic solution?View details
What is the most accurate piece of glassware for transferring 10ml: The pipet, the graduated cylinder, or the beaker?Explain why? And is there one choose you would never chooses an...View details
Why is standard enthalpy change 0 at 298 and 1 atm pressure?.?View details
I'm confused between these two terms.Help?
What is the difference between Enthalpy 'H' and quantity of heat 'q'?. Help...View details
1. What are the products in the fission if uranium-235 that make possible a nuclear chain reaction? 2. What is the purpose of placing control rods among uranium samples in a nucl...View details
Complete each of the following nuclear equations: a. ? + 5927Co→5625Mn + 42He b. ?→147N + 0-1e c. 0-1e + 7636Kr→? d. 42He + 24195Am→? + 210n...View details
Bauxite, the principle ore used in the production of aluminum cans, has a molecular formula of Al2O3•2H2O.?
a. what is the molar mass of bauxine b. what is the mass of aluminum in 0.58 moles of bauxite c.how many atoms of aluminum are in 0.58 mole of bauxite d.what is the mass of 2.1 ...View details
What amount moles is represented by each of these samples? a.150.0 g Fe2 o3 b.10.0 mg NO2 C 1.5 *10 ^16 molecules of BF3?View details
I need help with some chemistry problems?
1.Calculate the standard deviation of the empty flask masses from part 1. The answer needs to be in the form of average standard deviation. 2.What does standard deviation tell yo...View details