Chemistry Questions

What is the total number of grams of NaI(s)needed to make 1.0 liter of a 0.010 M solution?(1) 0.015 (3) 1.5(2) 0.15 (4) 15
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if there are 14 chromosomes in pea plant cells,how many chromosomes are present in a sex cell of a pea plant?
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A 133.8-gram sample of bronze was 10.3% tin by mass. Determine the total mass of tin in the sample.
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Which statement describes an alternate theory of acids and bases?(1) Acids and bases are both H+ acceptors.(2) Acids and bases are both H+ donors.(3) Acids are H+ acceptors, and bases are H+ donors.(4) Acids are H+ donors, and bases are H+ acceptors.
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An atom of argon rarely bonds to an atom of another element because an argon atom has(1) 8 valence electrons(2) 2 electrons in the first shell(3) 3 electron shells(4) 22 neutrons
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The compound NaOH(s) dissolves in water to yield(1) hydroxide ions as the only negative ions(2) hydroxide ions as the only positive ions(3) hydronium ions as the only negative ions(4) hydronium ions as the only positive ions
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A hydrogen ion, H+, in aqueous solution may also be written as(1) H2O (3) H3O+(2) H2O2 (4) OH–
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As the temperature of a chemical reaction in the gas phase is increased, the rate of the reaction increases because(1) fewer particle collisions occur(2) more effective particle collisions occur(3) the required activation energy increases(4) the concentration of the reactants increases
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A 10.0-gram sample of which element has the smallest volume at STP?(1) aluminum (3) titanium(2) magnesium (4) zinc
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Metallic bonding occurs between atoms of(1) sulfur (3) fluorine(2) copper (4) carbon
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Solid samples of the element phosphorus can be white, black, or red in color. The variations in color are due to different(1) atomic masses(2) molecular structures(3) ionization energies(4) nuclear charges
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Which organic compound is unsaturated?(1) 2-methylbutane (3) 2-hexanol(2) 2-chloropropane (4) 2-pentene
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In which reaction are electrons transferred from one reactant to another reactant?(1) 2Ca(s) + O2(g) =>2CaO(s)(2) AgNO3(aq) + KCl(aq) =>AgCl(s) + KNO3(aq)(3) HCl(aq) + NaOH(aq) =>NaCl(aq) + H2O(l)(4) H3O+(aq) + OH-(aq) => 2H=O(l)
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When the pH of a solution changes from a pH of 5 to a pH of 3, the hydronium ion concentration isA. 0.01 of the original contentB. 0.1 of the original contentC. 10 times the original contentD. 100 times the original content
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Most tornadoes carry wind speeds that range fromA. 1 to 105 km per hour. B. 267 to 322 km per hour. C. 105 to 177 km per hour. D. 178 to 266 km per hour.
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After being thoroughly stirred at 10.°C, which mixture is heterogenous?(1) 25.0 g of KCl and 100. g of H2O(2) 25.0 g of KNO3 and 100. g of H2O(3) 25.0 g of NaCl and 100. g of H2O(4) 25.0 g of NaNO3 and 100. g of H2O
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as additional KNO3(s) is added to a saturated solution of KNO3 at constant temperature, the concentration of the solution? (I know it remains the same but why??)
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Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two metals?A) The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.B) The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.C) The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.D) The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.
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