I have been teaching a variety of science courses (chemistry, Earth science, physical science, environmental science, and biology) for the past 10 years. Before that I work for the West Virginia Department of Agricultural identifying invasive plants.
What is resonance?
When does a molecular compound have resonance?
Draw resonance structures for each of the following molecules or ions:a. $\mathrm{ClNO}_{2}(\mathrm{~N}$ is the central atom $)$b. $\mathrm{OCN}^{-}(\mathrm{C}$ is the central atom $)$
Using Figure $10.6$, calculate the heat change needed for each of the following at the melting/freezing point:a. joules to melt $65.0 \mathrm{~g}$ of iceb. joules to melt $17.0 \mathrm{~g}$ of benzenec. kilojoules to freeze $225 \mathrm{~g}$ of acetoned. kilojoules to freeze $0.0500 \mathrm{~kg}$ of water
Using Figure $10.6$, calculate the heat change needed for each of the following at the melting/freezing point:a. joules to freeze $35.2 \mathrm{~g}$ of acetic acidb. joules to freeze $275 \mathrm{~g}$ of waterc. kilojoules to melt $145 \mathrm{~g}$ of ammoniad. kilojoules to melt $5.00 \mathrm{~kg}$ of ice
What is the chemical composition of the two compounds that formthe green tarnish that accumulates on objects made of copper?What is the formula of the copper compound that containssulphur? What is the formula of the other copper compound?
In a cross between AA, BB, CC and aa, bb, cc (P generation), what would be the frequency of individuals displaying an ABC phenotype in the F2 (F1xF1) generation? Assume complete dominance.a) 9/16b) 9/64c) 3/16d) 1/64e) 3/64
What type of Intermolecular force causes the dissolution of KCl in water?
In your research lab, you want to know if the pigmented noses inhuskies follow Mendelian inheritance. Theallele P is dominant for pigmentation in thenose and p is recessive for no pigmentation.You conduct a series of crosses between heterozygous parents(Pp) and observe 539 puppies with pigmented noses and 161with no pigmentation.What is the chi-square value of this cross?
How many significant figures are in the number 0.00120?The answer to the following addition problem should be expressedas: 10.11111+ 1.02 + 100.00001 + 0.04000 = 111.17112a.111.17b.111.1711c.111.2d.111.17112
A metal and an acid react violently to form sodium sulfate andhydrogen gas. What are the acid and the metal?Write chemical formulas separated by a comma. Do not include thestate of matter of the species in your answers.