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10th grade chemistry test

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Question:I am starting my sophomore year and i was wondering what supplies i should get based on my classes. my classes are: Algebra 2 Spanish 3 Chemistry Hp PE2 Ap Euro English 2 Hp also how hard are these classes and how should i prepare for them? thanks. my school does not have a supply list that is why i am asking.

Answers:def get a graphing calculator for algebra and chem. id get a binder for algebra, a binder for chem, and 3 folders and 3 spiral notebooks for the other three classes mechanical pencils #2 pencils 3 blue pens 3 red pens periodic table of elements from sparknotes or something for chem AP review book for euro because euro is going to be very hard and the test is impossible to pass without a review book spanish english translator and like work out clothes for PE

Question:i had to do a whopping 150 question take home test for chemistry and these are the ones i didnt get: oh, and explinations for the answers uld be nice 2 :) 8. the strongest hydrogen bonds are formed between molecules in which hydrogen is covalently bonded to an element with a) high electronegativity and large atomic radius b) low electronegativity and large atomic radius c) high electronegativity and small atomic radius d) low electronegativity and small atomic radius 21. the greatest absorption of energy occurs as an electron moves from a) 3p to 3s b) 4d to 4s c) 4s to 3p d) 1s to 3s 22. which of the following substances is the best conductor of electricity? a) Cu(s) b) Br2(L) (2 is subscript) c) H20(L) (2 is subscript) d) NaCl(s) 27. Electron X can change to a higher energy level or a lower energy level. Which statement is true of electron X? a) X emits energy when it changes to a higher energy level b) X niether emits nor absorbs energy when it changes energy level c) X absorbs energy when it changes to a higher energy level d) X absorbs energy when it changes to a lower energy level 28. the electron dot symbol X: represents a) a transition element b) an alkali metal c) a halogen d) an alkali earth metal 34. which elements contain atoms that form colored ions an have more than one positive oxidation state a) alkali earths b) nobel gases c) transition elements d) alkali metals 53. a 2 gram sample of helium at STP will occupy a) 33.6 L b) 11.2 L c) 44.8 L d) 22.4 L 89. Which substance has chemical properties similar to those of radio active (superscript numbers) 235U? a) 233Pa b) 206Pb c) 235Pa D) 233U 91. which, when bonded with sulfur, has the greatest ionic character (most unequally shared electrons)? a) Br b) Cl c) O d) P Thanks :)

Answers:8. C 21.D 22.A 27.C 28.D 34.C 53.B 89.D 91.C

Question:I am doing a chemistry research assignment on wastewater. one of the things we have to fine out is: briefly summarise the acceptable levels of total dissolved solids (TDS) and E Coli set by the department of health for class A treated wastewater, class B treatd wastewater, and potable water. i am having plenty of trouble with this question, can some one help me find a suitable site which explains this and gives the answers. i am just having so much trouble with this question! thanks

Answers:You bet I can help! These are Excellent sites for you to use and to cite for your research assignment: The United States Environmental Protection Agency (EPA), Wastewater Management Section: http://www.epa.gov/owm/ The California State Water Resources Control Board: http://www.swrcb.ca.gov/ You'll find everything you need. Get an A!!

Question:What is the definition of: -endothermic change -exothermic change -heterogeneous mixture -homogeneous mixture

Answers:Endothermic: when the reaction takes in more heat (energy) than it lets out. Often times this reaction will feel cool to the touch. Exothermic: When the reaction lets off more heat (energy) than it takes in. Often times this reaction will feel warm to the touch. A common example is putting a few drops of sulfuric acid in a test tube of water. Heterogeneous Mixture: a mixture of different solutions (or suspensions) where you can see the difference. Examples include oil and water; or precipitates in a solution (flour in water). Homogeneous Mixture: a mixture of different solutions where you cannot see any difference. They are prefectly well-mixed. They have definite, consistent properties, where particles are uniformly spread. Hope that helps! :)

From Youtube

Chemistry demo, 10th grade - Fire :just a quick video recorded on my 4th gen itouch. what he was demonstrating.. basically he had bubbles and a lighter he then attempted (a couple times) to get the bubble off the the blower and light it on its way up created as you saw in the video a reaction. The flickering was not the ipods fault the kid was turning them on an off very annoyingly

My 10th Grade Chemistry Project :Part 1 Organic Compounds/ Hydrocarbons Part 2 Carbohydrates, Lipids, Proteins, Nucleic Acids