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Question:1. Which of the following lists ranks nuclear radiation from most massive to least massive? a. alpha, beta, and gamma b. beta, gamma, and alpha c. gamma, alpha, and beta d. gamma, beta, and alpha 2. How many half-lives are required for three-fourths of the nuclei of one isotope in a sample to decay? a. 3/4 b. 3/2 c. 3 d. 2 3. What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years? a. 1.5 years b. 2.5 years c. 3.5 years d. 4.5 years

Answers:1) If related to particle size, then a. If related to penetration energy, then d. 2) Two half-lives are needed ((1/2)^2 = 1/4 remaining), so d. 3) Particle has undergone 2 half-lives of radiation (3/4 of the material has decayed), so 3/2 = 1.5 years, so a.

Question:Addition of HCl to 3-methyl-1-pentene gives two products. One of these is 2-chloro-3-methylpentane. What is the other product? a.) 1-chloro-3-methylpentane b.) 3-chloro-3-methylpentane c.) 3chloro-2-methylpentane d.) 2-chloro-2-methylpentane Thanks for any kind of help!!

Answers:The Answer is Actually b.) 3-chloro-3-methylpentane... I'm 100% sure, because this is the mayor product according to Markovnikovs rule and the Hydride Shift that occurs.

Question:4. One of the many negative impacts of acid rain is the deterioration of marble sculptures. Write a balanced equation for the reaction of marble (calcium carbonate) with nitric acid (aqueous hydrogen nitrate) to form calcium bicarbonate and calcium nitrate (both products are soluble in water). a) CaCO3(s) + HNO3(aq) --> CaNO3(aq) + Ca(CO3)2(aq) b) 2CaCO3(s) + 2HNO3(aq) --> Ca(HCO3)2(aq) + Ca(NO3)2(aq) c) CaCO3(s) + 4HNO3(aq) --> 2Ca(HCO3)2(aq) + 4Ca(NO3)2(aq) d) 2CaCO3(s) + HNO3(aq) --> Ca(HCO3)2(aq) + Ca(NO3)2(aq) All numbers should be written as subscripts, sorry if it confusing.

Answers:B) Because it is the only one where all the elements are balanced correctly in both sides of the equation. Can't be A because it violates the law of conservation of matter, as on the left side you have hydrogen and on the right there is none (can't just disappear). And the rest they are just unbalanced

Question:1) Which of the following is the correct order of steps to establish a theory? a) conducting experimental work, collecting observations, making a hypothesis, establishing a theory. b) establishing a theory, conducting experimental work, collecting observations, making a hypothesis. c) making a hypothesis, collecting observations, establishing a theory, conducting experimental work. d) collecting observations, making a hypothesis, conducting experimental work, establishing a theory. 2) Which of the following units would best describe the distance between two asteroids hat at 8 deca hecto kilo miles apart? a) gigamile b) Teramile c) Macromile d) megamile 3) a rectangular tile, 15 by 18 inches, can be converted into square meters by which one of the following conversion setups? a) (15in x 18in)(2.54cm/1in)(1m/100cm) b) (15in x 18in)(2.54cm/1in)^2(1m/100cm) c) (15in x 18in)(2.54cm/1in)^2(1m/100cm)^2 d) (15in x 18in)(2.54cm/1in)(1m/100cm)^2 4) Calculate the density, in kg/L, of a block of wood 2.5 feet by 18 inches by 1 yard that weighs 646lbs. a) .92 kg/L b) 9.2 kg/L c) 1.1 kg/L d) 4.9 kg/L the second question should say 'that are' not hat at.

Answers:1) Which of the following is the correct order of steps to establish a theory? d) collecting observations, making a hypothesis, conducting experimental work, establishing a theory. 2) Which of the following units would best describe the distance between two asteroids hat at 8 deca hecto kilo miles apart? d) megamile 3) a rectangular tile, 15 by 18 inches, can be converted into square meters by which one of the following conversion setups? c) (15in x 18in)(2.54cm/1in)^2(1m/100cm)^2 4) Calculate the density, in kg/L, of a block of wood 2.5 feet by 18 inches by 1 yard that weighs 646lbs. b) 9.2 kg/L

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6. Alkenes - Multiple choice questions :Alkenes multiple choice questions suitable for AS or A-level chemistry. Part of a set of tutorials on alkenes, suitable for AS chemistry, International Baccalaureate or equivalent. Content includes bonding, shape, EZ isomerism, electrophilic addition and polymerisation.

Multiple choice questions :medicaleducator.co.uk contains over 1000 multiple choice questions covering all key areas you need to revise for your medical student exams