Isotopes Guides d'étude, Notes de cours & Résumés

An element has 8 protons, 9 neutrons, and 8 electrons. What are its atomic number and mass? - 8 and 17 How many and what type of bonds does sulfur usually form in biology? - 2 covalent A molecule that has all non polar covalent bonds would be________. - hydrophobic What substance makes up the interior of a potato tuber? - starch What is an example of a lipid? - triglyceride One characteristic shared by sucrose, lactose, and maltose is that __________. -they are all dissacharides The over...

What is the term used for findings that are summarized based on a pattern or trend? a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction - a. Law Which of the following is a tentative explanation for a set of observations? Select one: a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction - b. Hypothesis If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? Select one: a. Solute b. Compound c. Homogeneous mixture d. Heterog...

Which of the following is composed of a single central nucleus? - ANS - A-Correct What is the time it takes a radioactive isotope to transform 50 percent of its atoms by radioactive decay? - ANS - C-Correct Which is a form of non-nuclear radiation? - ANS - A-Incorrect What is the SI (international) unit for activity? - ANS - A-Correct RADIAC instruments that collect and measure the ion pairs created when radiation interacts with matter utilizes which operating principle? - ANS - D...

Lead-based paint (LBP) - Correct answer-Any varnish, shallac, or coating that contains either- 1.0 mg/cm2 - 0.5 % by weight - 5000 ppm - Older instruments could not read accurately at 0.7, so the lead standard was updated to 1.0 Dust sample clearance values - Correct answer-- Floors: 40 μg/ft2 > 10 μg/ft2 (10 μg/ft2 in NY) - Windows: 250 μg/ft2 > 100 μg/ft2 (50 μg/ft2 in NY) - Window wells (troughs): 400 μg/ft2 (100 μg/ft2 in NY) - Samples must be at 1 sq ft > 2 sq ft (can ...

Hypothesis correct answer: a testable educated guess Experiment correct answer: how we test hypotheses Variable correct answer: Idea to be tested (only one) Control correct answer: Something the variable is tested against Experimental protocol correct answer: How do you do the test? Results correct answer: Data generated comparing variable to controls. Includes statistics to show results are meaningful Conclusion correct answer: Interpretation of results independent v...

describe the basic functions all life forms must accomplish -response to environmental stimuli & maintain homeostasis -uptake and processing of nutrients/energy -regulation -growth and reproduction compare and contrast eukaryotic and prokaryotic cell types Prokaryotes: -circular chromosomes, no nucleus, no organelles, 3.5 bya -DNA concentrated in nucleoid Eukaryotes: -linear chromosomes, nucleus, organelles, 1.5 bya -DNA concentrated in nucleus Both: -cellular function takes p...

Section A Answer all questions in this section. Do not write outside the box Two stable isotopes of helium are 4He and 3He. 2 2 . An atom of 4He is produced in a rock that contains uranium. It is produced following 2 the radioactive decay of a 238U atom. The decay also creates an atom of 92 thorium (Th). Write an equation for the decay of 238U. 92 [2 marks] 238U → 92 . A 3He nucleus can be produced by the decay of a tritium nucleus 3H. 2 1 Stat...

CSP1501 Assignment 1 2024 (Solutions) Question 1 Not yet answered Marked out of 1.00 Flag question Question text Which one of the following options lists only inorganic compounds? a. Water, salts, gas b. Carbohydrates, protein, fats c. Salts, gas, carbohydrates d. Water, oxygen, carbon dioxide, electrolytes Clear my choice Question 2 Not yet answered Marked out of 1.00 Flag question Question text Select the correct symbol for Dubnium a. Db b. D c. Dm d. Du Questio...

CLEP Chemistry Latest Update Graded A John Dalton Proposed that matter is composed of atoms; these atoms have different identities called elements, which combine to form compounds; measured masses of reactants and products. J.J. Thompson Observed deflection of particles in a cathode ray tube; proposed that atoms are composed of positive and negative charges; developed the plum pudding model of the atom Robert Millikan Calculated the charge-to-mass ratio of electrons using oil drops falling in ...

Given the following table, which statement is true about atoms A and B? - Answer-A. A and B are isotopes of the same element How many protons and neutrons does iron-56 have? - Answer-D. 26 protons and 30 neutrons Which of the following is the correct for an isotope with 3 protons and 5 neutrons? - Answer-C. 8/3 Li Which of the following is the most stable isotope? - Answer-D. Plutonium-238 As the mass of the nucleus increases, what happens to the ratio of neutrons to protons in stable isot...