A chemist isolates 17.43 g of product from a reaction that has a calculated theoretical yield of 21.34 g. What is the percentage yield?
What volume of 0.125 M KOH is required to prepare 750 ml of 0.06500 M KOH?
Is Rb2S, Li2Cr2O7, Cu(ClO4)2 insoluble or soluble and why?
KOH Is this soluble or insoluble in water? What rules of solubility makes this so?
What volume (L) of 0.750 M NH3 solution would you use to prepare 0.500L of 0.250M NH3 solution?
Question 1: M. tuberculosis, the organism that causes tuberculosis, can be completely destroyed by irradiation with UV light with a wavelength of 254 nm. What is the frequency? Question 2: Aradio station's signal broadcasts at a freq. 1240kHZ. What is the wavelength in meters?
A) What is an oxygenate? b) Name one octane enhancer
Give the name and chemical symbol for: a) An element with 50 electrons b) An element with 28 protons c) An element with 2 electrons in the first shell, 8 electrons in the second shell, 8 electrons in the third shell, and 2 electrons in the fourth shell d) An element with atomic number of 78
While you are working in the lab your instructor hands you a vial of red, crystalline material and asks you to tell if it has ionic or covalent bonding. Describe at least one experiment you would do to answer the instructor's question.
Tell whether the following is a property of a compound or a mixture: a) Can contain three elements in a specific ratio b) Varies in chemical composition depending on the sample size c) Can be classified as either homogeneous or heterogeneous
Tell if the mixture is homogeneous or heterogeneous and explain why you classified it as homogeneous or heterogeneous. a) Iced tea b) Salad c) Chocolate chip cookie
What is the principal environmental concerns about the continued use of plastics? Name some secondary concerns.
Suppose you were given samples of two different liquids. Describe how you would determine which one is more voliatile.
If auto gas mileage of 28.5 miles per gallon, how many kilometers can it travel on 1.0 litre of gas? What is formula to figure?
Calculate the ratio of HCL molecules in the first excited rotational state to those in the ground state @ 25 C. Assume an equilibrium bond distance of 1.275 angstroms. the angstrom part of the problem throws me off, I usually start these out by solving Change in E = ( h ) ( c )(Wo), but this is a q (rot) prob, not a q (elec).
What chemical symbol is used as the equivalent of 2superscript 1subscript H? Name and give the chemical symbols for the elements with the first 10 atomic numbers.
Name the three isotopes of the element whose atomic number is 1. (b) What collective name do we give to a mixture of these three isotopes when they are present in the same ratios as in the universe as a whole?
Which molecule does not exhibit dipole-dipole forces. SO2, ICl, H2O, CH4.
The volume of a certain bacterial cell is 1.60 µm3. (a) What is its volume in cubic millimeters (mm3)? (b) What is the volume of 105 cells in liters (L)? [show all the conversion factors that were used in calculating the answers]
A particle is constrained to lie along a one-dimensional line segment between 0 and a. The probability of finding the particle along this line segment is seen in attached file. A. Find the proportionality constant, ie., normalize the function. B. Calculate the expectation values of X and X^2 for n=1 and n=2. C. Find t
Explain. 4.4 x10 -2 ) (2.2 x 10-7) that is 10 to the minus 2 and 10 to the minus 7.
How much of a 5 M stock solution of HCl is needed to make 250 mL of a 0.1 M solution of HCl?
I need help in solving this word problem: A corrupt barman attempts to prepare 100ml of some drink by mixing 30ml of ethanol with 70 ml of water. Does he succeed? If not, what volumes should have been mixed in order to arrive at a mixture of the same strength but of the required volume?
Precipitation Calculations. Will a precipitate of calcium sulfate (Ksp = 2.4 x 10-5) form when 50.0 mL of 0.00150 M calcium chloride and 25.0 mL of 0.0100 M sodium sulfate are mixed? Why or why not?
What color has the smallest band in the spectrum of a tungsten light bulb? I have guessed yellow because the waves are shortest but don't know if I am right.
Characteristic chemical differences between metals and non-metals, corresponding phosphorus and arsenic compounds
What are the characteristic chemical differences between metals and non-metals? Explain why corresponding phosphorus and arsenic compounds resemble each other more closely than they do nitrogen compounds. Name each of the following ions or compounds. (see the attachment for the compounds)
"What would the world be like where water is as dense as a solid rather than a liquid?" Ideas occur.
A closed flask contains a .25 moles of O2 which exerts a pressure of .50 atm. If .75 moles of CO2 is added to the container what is the total pressure in the flask? Please provide step by step instructions with explanation.
Which one of the following configurations depicts an excited oxygen atom? a. 1s22s22p2 b. 1s22s22p23s2 c. 1s22s22p4 d. [He]2s22p4 e. 1s22s22p1 In a ground-state manganese atoms, the _____ subshell is partially filled. a. 4s b
Please explain steps taken to establish the center of mass with polar covalent bonds and dipole moments - why is this important?