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TRUE/FALSE. protein molecules are chains of subunits called amino acids.
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the energy levels in the hydrogen atom are negative because
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the alpha particles in rutherfords experiments were used to
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what types of properties change during a chemical reaction?
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Which type of radiation has the highest penetrating ability?A: alphaB: betaC: gammaD: nuclear
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how many protons and neutrons does an oxygen atom have
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all of the following compounds are soluble in water except CaCL2 NH4Cl FeCl3 NaCl PbCl2.
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a disadvantage of the contraceptive sponge is it _____.
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Exercise 3: Neurophysiology of Nerve Impulses: Activity 4: The Action Potential: Importance of Voltage-Gated Na+channels Lab ReportPre-lab Quiz ResultsYou scored 100% by answering 4 out of 4 questions correctly.Voltage-gated Na+ channels are membrane channels that openYou correctly answered: b. when the membrane depolarizes.When open, Na+ channels allowYou correctly answered: a. Na+ ions to diffuse into the cell.Which of the following is true of an action potential?You correctly answered: d. All of these answers are correct.Which of the following can reduce the likelihood of an action potential?You correctly answered: d. All of these can reduce the likelihood of an action potential.
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when a sample of liquid is warmed its thermal energy
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Which of the following molecules contains an ionic bond? MgCl2. Cl2 SF3 Cl2O7 none of the above.
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how many quarts of pure antifreeze must be added to
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what two substances are always produced by a neutralization reaction
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Which of the following statements about enzymes is true?A) The increase the rate of chemical reactions.B) They function as biological catalysts by lowering the activation energy.C) They regulate chemical reactions in a cell.D) They operate at an optimal pH and optimal temperature.E) All of the above.
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The atomic number of an atom is determined by the number of a. protons. b. electrons. c. neutrons. d. isotopes
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calculate the formal charge on n in the molecule nh3
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An increase in temperature will cause an equilibrium to: Select the correct answer below: O shift right O shift left O no change O depends on the equilibrium
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Photochemical smog is formed when nitrogen oxides (NOx) and volatile organic hydrocarbons react when activated by sunlight.
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Classify the following transformation as oxidation, reduction, or neither. A. Oxidation B. Reduction C. Neither
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1. Is diphenylmethane a solid or a liquid at room temperature?
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the most unique property of carbon is its ability to
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Calculate the standard free-energy change for the following reaction at 25 C. Standard reduction potentials can be found here. 2Au^3+(aq) + 3Cr(s) 2Au(s) + 3Cr^2+(aq)
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2. Which mixture could be a useful buffer in a solution?acetic acid (CH3CO2H) and hydrochloric acid (HCl)sodium hydroxide (NaOH) and elemental sodium (Na)ammonia (NH3) and ammonium chloride (NH4Cl)acetic acid (CH3CO2H) and ammonia (NH3)Pls answer quickly
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what is the ability of an atom to attract electrons
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