Chemistry Questions

Radioactive cobalt-60 is used in radiation therapy treatment. Cobalt-60 undergoes beta decay. This type of nuclear reaction is called(1) natural transmutation(2) artificial transmutation(3) nuclear fusion(4) nuclear fission
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explain why lighting a sparkler is considered a spontaneous reaction even though it doesn't stat start spontaneously
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A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from(1) 400. K to 200. K (3) 400.°C to 200.°C(2) 200. K to 400. K (4) 200.°C to 400.°C
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A 5.0-gram sample of zinc and a 50.-milliliter sample of hydrochloric acid are used in a chemical reaction. Which combination of these samples has the fastest reaction rate?(1) a zinc strip and 1.0 M HCl(aq)(2) a zinc strip and 3.0 M HCl(aq)(3) zinc powder and 1.0 M HCl(aq)(4) zinc powder and 3.0 M HCl(aq)
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A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in( I) boiling point (2) density at STP(3) freezing point (4) solubility in water
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43. Which temperature change would cause a sample of an ideal gas to double in volume while the pressure is held constant?(1) from 400.K to 200.K(2) from 200.K to 400.K(3) from 400.oC to 200.oC(4) from 200.oC to 400.oC
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Which liquid has the highest vapor pressure at 75°C?(1) ethanoic acid (3) propanone(2) ethanol (4) water
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A student wants to prepare a 1.0-liter solution of a specific Molarity. The student determines that the mass of the solute needs to be 30. grams. What is the proper procedure to follow?(1) Add 30. g of solute to 1.0 L of solvent.(2) Add 30. g of solute to 970. mL of solvent to make 1.0 L of solution.(3) Add 1000. g of solvent to 30. g of solute.(4) Add enough solvent to 30. g of solute to make 1.0 L of solution.
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How many total atoms are in 0.380 g of P2O5
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What does FE stand for in the Periodic Table of Elements?
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What occurs when there are OH- ions in a solution? A. A sour taste B. A reaction with Al (s) to release hydrogen gas C. a slippery feeling D. A reaction with a base
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Which statement about the self-ionization of water is correct? a. Two water molecules interact to form a water molecule and a hydroxide ion. b. Two water molecules interact to form a hydronium ion and a hydroxide ion. c. Two water molecules interact to form two hydronium ions. d. Two water molecules interact to form two hydroxide ions.
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The scientific evidence that scientists use in supporting or critiquing the conclusions of experiments usually consists of
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The pH of a solution is 2.0. Which statement is correct? A)The pOH of the solution is 12.0. B)The concentration of OH- ions is 1.0 x 10-2 M. C)The concentration of H+ ions is 100.0 M. D)The pOH of the solution is 7.
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How many grams of water will form if 10.54 g H2 react with 95.10 g O2
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What is the salt produced when calcium hydroxide, Ca(OH)2, reacts with phosphoric acid, H3PO4, in a neutralization reaction?
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How many hybrid orbitals are found in CCl4?
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Which compound contains both ionic and covalentbonds?(1) CaCO3 (3) MgF2(2) PCl3 (4) CH2O
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