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What is the composition of anti-dust chalk? What are differences between normal blackboard chalk and anti-dust chalk? What made anti-dust chalk anti-dust? Explain in details.
Consider two hypothetical elements, W and Z. Element W has an electron affinity of ?150 kJ/mol, and element Z has an electron affinity of ?38 kJ/mol.
You can get sunburn on a cloudy day, but you can't get sunburn even on a sunny day behind glass. Explain.
What is the heat of vaporization(kJ/mol) if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point?
A 250 gram sample of water at the boiling point had 64.0 kJ of heat added. How many grams of water were vaporized. Heat of vaporization for water is 40.6 kJ/mole
How many kJ of heat are needed to completely vaporize 1.30 moles of ? The heat of vaporization for water at the boiling point is 40.6 kJ/mole
Reductive amination can be used to form primary, secondary, and tertiary amines. Secondary amines are more basic than primary amines due to extra electron donation by the alkyl groups.
An element has three naturally occurring isotopes, calculate the percent abundance and the atomic mass
A single cell has a radius of 15 um, a volume of 14.1 picoliter, and a mass of 15.5 nanograms. what is the density of this cell in g/mL
Consider the cell reaction Sn(s) + Cu2+(aq) ? Sn2+(aq) + Cu(s). The value of Ecell is 0.447 V at 25°C. Calculate the value of ?G° and K for this cell.
An ice cube at 0 degrees C with a mass of 115 g is added to H2O in a beaker that has a temperature of 64.0 degrees C. if the final temperature of the mixture is 24.0 degrees C, what was the initial
a) water is sprayed on the ground of an orchard when temperatures are near freezing to keep the fruit from freezing. Explain b) How many kilojoules of energy are released if 5.0 kg of water at 15 de
Describe the type of compound that could have each of the following types of attractive forces: a) dipole-dipole attractions; b) Hydrogen bonding; c) dispersion forces.
Predict the shape and polarity of each of the following molecules. Assume all bonds are polar: a) a central atom with four identical bonded atoms and no lone pairs. b) a central atom with three iden
Classify each of the following molecules as polar or nonpolar: a) GeH4; b) I2; c) CF3Cl; d) PCl3; e) BCl3; f) SCl2.
Draw electron-dot formula and determine the shape for each of the following: a) NH4^+; b) O2^2-; c) COCl2 (C is the central atom); d) BCl3.
A 0.10-mole quantity of CuSO4 is added to a liter of 1.0 M NH3 solution. What is the concentration of Cu2+ at equilibrium. [The formation constant for Cu(NH3)42+ is Kf = 5.0 x 1013.]
Select the more polar bond in each of the following pairs: a) C-C or C-O; b) P-Cl or P-Br; c) Si-S or Si-Cl; d) F-Cl or F-Br; e) P-O or P-S.
Draw the electron-dot formula for each of the following: a) H3COCH3 (the atoms are in the order C O C); b) CS2 (the atoms are in the order S C S); c) CLO2^-; d) SF3^+; e) H2CCHCN (the atoms are in t
Determine the total number of valence electrons in each of the following: a) COCl2; b) N2O; c) ClO2^-; d) SeCl2; e) PBr3
Calculate the pH of the solution resulting from the addition of 20 mL of 0.10 M NaOH to 100 mL of 0.10 M HCN (Ka = 4.9x10^(-10))
If cadmium metal and the Fe(III) ion are mixed in aqueous solution, a solution containing Cd(II) and Fe(II) results. The balanced equation for this process is
Why two different proteins that are both 1500 amino acids long would travel together through the polyacrylamide gel in a single band containing both of the two different proteins.
Draw a cooling curve for a sample of steam that cools from 110 degrees C to -10 degrees C. indicate the segments of the graph that correspond to each of the following: a)solid; b) freezing; c) liqui
why does water in a wide, flat shallow dish evaporate more quickly than the same amount of water in a tall, narrow vase? c) why does a sandwich on a plate dry out faster than a sandwich in plastic w