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1. The chemical formula of methane is CH4. The Lewis Structure of methane is shown below. Explain how a chemical formula differs from a Lewis structure.
2. Draw a Lewis structure for the following molecules. Include the total number of valence electrons for each molecule. Show all your work.
a.PH3
b.CS2
0.25 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 8.0 L of solution. What is the ph of this solution?
a plot of density of ethyl alcohol as a function of temperature was found to be linear. what would you expect the value
David J hooper weighs out 13.1 grams of salicylic acid in a 250 mL flask and adds 7.5 mL of acetic anhyride (density=1.080 g/mL) Determine the max (theoretical number of grams) of acetlysalicylic acid he can prepare
How are the ingredients in the energy drink rockstar helpful to someone expending a lot of energy?
Suppose that a series of measurements have shown that the mean mass of an object 201.3g with a standard deviation 1.3g How many significant figures are justified in the mean and how would you report the most probable mass of the object. Explain
A lawn fertilizer is rated as 7.35% nitrogen, meaning 7.35 g of N in 100 g of fertilizer. The nitrogen is present in the form of urea, (NH2)2CO. How many grams of urea are present in 100 g of the fertilizer to supply the rated amount of nitrogen?
Draw out the Lewis structures for H2CO3, HCO3-, and CO32-. Then determine the maximum number of equivalent resonance structures for each species. Note that carbon is the central atom in all three cases
Imagine a single DNA strand containing a section with the following base sequence: 5'-GCATTGGC-3'. What is the base sequence of the complementary strand
If the solution contains 52.4 g silver nitrate and is mixed with 53.1 g of barium chloride. What is the mass of the excess reagent left behind?
exactly 16.9mL of EDTA are required to reach the EBT endpoint. calculate the total hardness in ppm CaCO3.
The relationship (if any) of the lattice energy of compounds such as ZnO vs. H3BO3 vs. their respective solubilities. For instance, at neutral pH and standard conditions
Provide the steps required to successfully recrystallize an impure solid and obtain a pure product.
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