Chemistry Questions

Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell you?
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In the third period of the periodic table, sodium is followed by magnesium, aluminum, silicon, and phosphorus. Which of these elements has the smallest atomic size?
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The volume of a gas decreases from 15.7 m3 to 11.2 m3 while the pressure changes from 1.12 atm to 1.67 atm. If the initial temperature is 245 K, what is the final temperature of the gas
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The process of seeking facts that will lead to the truth is called _____.a. studyb. researchc. intuition
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How might a dependence on fossil fuels lead to international security risks?a. The greater demand for fossil fuels with decreasing supplies could lead to an increase in competitive action over limited resources. b. A dependence on fossil fuels could lead more countries to produce oil, leading to greater competition for sales. c. An increase in dependence on fossil fuels could lead to lower costs for oil, causing disputes between producer and consumer countries. d. All of the above
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Polly is pushing a box across the floor with a force of 30 N. The force of gravity is –8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box?
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As ice transforms into steam, A)new molecules are formed. B)the types of atoms are changed. C)energy is absorbed by the molecules. D)the mass of the molecules is increased.
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How many moles are represented by 250g of platinum?
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What is the maximum mass of glucose (C6H12O6) that can be burned in 10 g of oxygen?
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Based on the results of testing colorless solutions with indicators, which solution is most acidic?(1) a solution in which bromthymol blue is blue(2) a solution in which bromcresol green is blue(3) a solution in which phenolphthalein is pink(4) a solution in which methyl orange is red
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Potassium hydroxide is classified as an Arrhenius base because KOH contains(1) OH- ions (2) O2- ions (3) K+ ions (4) H+ ions
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An atom of any element must contain(1) an equal number of protons and neutrons(2) an equal number of protons and electrons(3) more electrons than neutrons(4) more electrons than protons
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Which process is exothermic?(1) boiling of water(2) melting of copper(3) condensation of ethanol vapor(4) sublimation of iodine
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6 At STP, which element is a good conductor of electricity?(1) chlorine (3) silver(2) iodine (4) sulfur
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According to one acid-base theory, water acts as an acid when an H2O molecule(1) accepts an H+ (3) accepts an H-(2) donates an H+ (4) donates an H-
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A 2.0-liter aqueous solution contains a total of 3.0 moles of dissolved NH4Cl at 25°C and standard pressure.Determine the molarity of the solution.
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An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of(I ) 4- (3) 3+(2) 3- (4) 4+
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Which element, represented by X, reacts with fluorine to produce the compound XF2?(1) aluminum (3) magnesium(2) argon (4) sodium
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