Predict the number of valence electrons for a sulfur atom. a. 4 b. 6 c. 8 d. 16 e. 32 58. Predict the number of valence electrons for a chlorine atom.
How many half-lives have passed since the crystal formed? A) 1 B) more than 1 but less than 2 C) more than 2 but less than 3 D) more than 3 Answer: B 4) Which of the following geologic observations would NOT bear directly on working out the sequence of geologic events in an area? A) inclusions of sandstone in a granite pluton B) a well-exposed dike of basalt in sandstone C) an unconformity between a granite and sandstone D) the feldspar and quartz contents of a granite Answer: D 5) The principle of ________ is the concept that ancient life forms evolved in a definite order and therefore their fossils can help determine the geologic ages of strata. A) superposition B) cross-cutting relationships C) fossil succession D) fossil assemblage Answer: C 6) Which of the following is an essential characteristic of an index fossil? A) The organism lived in a very specific environment or two, such as tropical volcanic islands.
2 marks 4 Draw the structural formula of Compound G. 1 mark 5 Using the chemical shift correlation for 13C NMR, predict the number of peaks for Compound G and draw in the position of the peaks on the blank spectrum below, annotating each peak with its corresponding structure. (2 marks) 6 Draw the structural formula for 2-chloro but-2-ene. Below this draw a structural formula of an isomer of 2-chloro but-2-ene and name this substance.
Using Numbers: Calculate the moles of iron used in the reaction. 6. Using Numbers: Determine the whole number ratio of moles of iron to moles of copper. 7. Comparing and Contrasting: Compare the ratio of moles of iron to moles of copper from the balanced chemical equation to the mole ratio calculated using your data.
Unit 2 ( Isotopes Problem Set 2-2 1. Which of the following are isotopes of element X, with atomic number of 9: [pic],[pic],[pic], and [pic]. 2. For each of the following isotopes, write the nuclear symbols: a. Cu-63, Cu – 65 b. C-12, C-14 c. Mg-24, Mg-25, Mg-26 d. Ne-20, Ne-21, Ne-22 3. Verify that the atomic mass of magnesium is 24.31 amu, given the following information: [pic], mass = 23.985042 amu; percent abundance = 78.99% [pic], mass = 24.985837 amu; percent abundance = 10.00% [pic], mass = 25.982593 amu; percent abundance = 11.01% 4.
ANS: B PTS: 1 DIF: L2 REF: p. 276 | p. 277 | p. 278 OBJ: 9.2.2 Apply the rules for naming and writing formulas for compounds with polyatomic ions. STA: SC.912.P.8.7 | SC.912.N.1.1 | SC.912.N.1.6 BLM: application 58. ANS: C PTS: 1 DIF: L2 REF: p. 268 | p. 278 OBJ: 9.2.2 Apply the rules for naming and writing formulas for compounds with polyatomic ions. STA: SC.912.P.8.7 | SC.912.N.1.1 | SC.912.N.1.6 BLM:
One of the biggest disadvantages is not being able to make connections as easy as the copper. Fiber optic cables have a core as fine as a human hair, making it extremely difficult to splice. Copper cables are obviously not going to be around forever with the fiber optics being so futuristic, but they still have advantages over the fiber. Copper is very easy to work with. When making connections it is so much easier to splice the copper cable than it would be for the fiber.
Fiber optic cabling is immune to EMI and other noise interferences and therefore the chance of signal loss is greatly reduced. One drawback on this type of cabling is that just like its copper; fiber optic cabling is very durable and tough making it harder to work with when it comes to installing it. A technician will have to be very well trained in handling it to get the most out of it for the customer. But fiber optic cabling has a much higher bandwidth over copper so it can handle much more traffic as well as at higher speeds than copper wiring. In the real world, one might choose one cabling type over the other.
A) sulfide ion B) sulfate ion C) sulfite ion D) bisulfate ion 12. What is the correct chemical formula of tin(IV) cyanide? A) Ti(CN) 4 B) TiC 4 N 4 C) Sn(CN) 4 D) SnC 4 N 4 E) Sn(CN) 2 Page 3 13. The formula for zinc acetate is _____. A) ZnCH 3 CO 2 B) Zn(CH 3 CO 2 ) 2 C) Zn(HCO 3 ) 2 D) Zn(HCl) 8 14.
Today there are 118 elements on the periodic table; Mendeleev’s version had only 63 elements on it. The first scientific discovery of an element was phosphorous. Other Metals is a group that consists of 7 elements. Other metals are special because unlike transition metals the other metals don’t exhibit a variable oxidation state. They are also solid and have a high density, they