Ethylene, C2H4, and tetrafluoroethylene, C2F4, are used to make the polymers polyethylene and polytetrafluoroethylene (Teflon), respectively.

Draw the Lewis structures for C2H4 and C2F4, and give the ideal H-C-H and F-C-F bond anges.

Analysis of a compound indicates the percent composition 42.07% Na, 18.89% P, and 39.04% O. Determine its empirical formula.

Phosgene is a highly toxic gas that has been used as a chemical weapon at times in the past. It is now used in the manufacture of polycarbonates, which are used to make compact discs and plastic eyeglass lenses. Phosgene is produced by the reaction, $\mathrm{CO}+\mathrm{Cl}_2 \rightarrow \mathrm{COCl}_2$. Given an excess of carbon monoxide, what mass of chlorine gas must be reacted to form 4.5g of phosgene?

Phosgene (COCl2) was used as a poison gas in World War I. Predict the organic product formed when phosgene reacts with one equivalent of ethanol, followed by one equivalent of methylamine. Draw the molecule.

Part A

Write balanced complete ionic equation for $\ce{HCl( aq ) + LiOH( aq ) \rightarrow H2O( l ) + LiCl( aq )}$. Express your answer as a chemical equation. Identify all of the phases in your answer.

Part B

Write balanced net ionic equation for $\ce{ HCl( aq ) + LiOH( aq ) \rightarrow H2O( l ) + LiCl( aq )}$. Express your answer as a chemical equation. Identify all of the phases in your answer.

Part C

Write balanced complete ionic equation for $\ce{CaS( aq ) + CuCl2( aq ) \rightarrow CuS( s ) + CaCl2( aq )}$. Express your answer as a chemical equation. Identify all of the phases in your answer.

Part D

Write balanced net ionic equation for $\ce{CaS( aq )+CuCl2( aq )→CuS( s )+CaCl2( aq )}$ Express your answer as a chemical equation. Identify all of the phases in your answer.

Part E

Write balanced complete ionic equation for $\ce{NaOH( aq ) + HNO3( aq ) \rightarrow H2O( l ) + NaNO3( aq )}$. Express your answer as a chemical equation. Identify all of the phases in your answer.

Part F

Write balanced net ionic equation for $\ce{NaOH( aq ) + HNO3( aq ) \rightarrow H2O( l ) + NaNO3( aq )}$. Express your answer as a chemical equation. Identify all of the phases in your answer.

Part G

Write balanced complete ionic equation for $\ce{Na3PO4( aq ) + NiCl2( aq ) \rightarrow Ni3(PO4)2( s ) + NaCl( aq )}$. Express your answer as a chemical equation. Identify all of the phases in your answer.

Part H

Write balanced net ionic equation for $\ce{Na3PO4( aq ) + NiCl2( aq ) \rightarrow Ni3(PO4)2( s ) + NaCl( aq )}$. Express your answer as a chemical equation. Identify all of the phases in your answer.

Because both tin and carbon are members of Group 4A(14), they form structurally similar compounds. However, tin exhibits a greater variety of structures because it forms several ionic species. Predict the shapes and ideal bond angles, including any deviations, for the following:

SnF62-

How do you find the derivative of y=ln(2x)?

Which of these atoms cannot serve as a central atom in a Lewis structure: (a) O; (b) He; (c) F; (d) H; (e) P? Explain.

Give the oxidation number of manganese in the following:

MnO42-

Mn2O3

You move toward a star at a speed of $0.99 c$. At what speed does light from the star pass you? What if you are moving away from the star?

A scientist designed a medical test for a certain disease. Among 100 patients who have the disease, the test will show the presence of the disease in 97 cases out of 100, and will fail to show the presence of the disease in the remaining 3 cases out of 100. Among those who do not have the disease, the test will erroneously show the presence of the disease in 4 cases out of 100, and will show that there is no disease in the remaining 96 cases out of 100. (a) What is the probability that a patient who tested positive on this test actually has the disease, if it is estimated that 20% of the population has the disease? (b) What is the probability that a patient who tested positive on this test actually has the disease, if it is estimated that 4% of the population has the disease? (c) What is the probability that a patient who took the test twice and tested positive both times actually has the disease, if it is estimated that 4% of the population has the disease?

Ackerman and Goldsmith (2011) compared learning performance for students who studied material printed on paper versus students who studied the same material presented on a computer screen. All students were then given a test on the material and the researchers recorded the number of correct answers.

a. Identify the dependent variable for this study. b. Is the dependent variable discrete or continuous? c. What scale of measurement (nominal, ordinal, interval, or ratio) is used to measure the dependent variable?

Which electron configuration represents an atom in the excited state? (1) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$, (2) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$, (3) $1 s^{2} 2 s^{2} 2 p^{6}$, (4) $1 s^{2} 2 s^{2} 2 p^{5} 3 s^{2}$.

Solve the inequality.

$$6 x + 1 \leq 4 x - 9$$