Chemistry

The roles of hydrochloric acid (HCl) in the digestive system?
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What is the molarity of a solution in which 0.45 grams of sodium nitrate (NaNO3) are dissolved in 265mL of the solution?A. 29.8MB. 87.2MC. 0.02MD. 0.52M
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.5.0 mg of radioactive nobelium-253 was removed from the reactor to beused in an experiment. It took 291 seconds (just under 5 minutes) toget the sample from the reactor to the laboratory. How many milligramsof nobelium-253 remained upon arrival to the laboratory? The half-lifeof nobelium-253 is 97 seconds.
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What Le Chateliers factors cause an increase in the concentration of Hb(CO)4(aq) in the Hb(CO)4(aq) + 4O2(g)Hb(O2)4(aq) + 4CO(g)
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Which energy source is a nonrenewable resource?
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3. How does heat travel by conduction?
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Identify the anode and cathode please
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Give the value of the quantum number , if one exists, for a hydrogen atom whose orbital angular momentum has a magnitude of 6(h/2).
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A gas was held at a constant temperature in a closed system. The initialpressure of the gas was 1.20 atm, while its initial volume was 2.30 L. Thefinal volume of the gas was 1.50 L. What was the final pressure of the gasto the nearest hundredth of an atmosphere?*
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How does the concentration of reactants affect the rate of a reaction?A. Increasing the concentration increases the kinetic energy of themolecules.B. Increasing the concentration increases the molecules' collisionfrequencyc. Increasing the concentration decreases the reaction's activationenergyD. Increasing the concentration increases the temperature of thesolution
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As SCUBA divers go deeper underwater, the pressure from the weight of all the water above them increases tremendouslywhich compresses the gases in their blood. What happens to the volume of gas in their blood as the diver rises quickly tothe surface?A As a diver rises, the pressure on their body increases which allows the volume of the gas to decrease.B. As a diver rises, the pressure on their body decreases which allows the volume of the gas to decrease.c. As a diver rises, the pressure on their body increases which allows the volume of the gas to increase.D. As a diver rises, the pressure on their body decreases which allows the volume of the gas to increase.
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Two objects, labeled A and B, are the same size. Object A has a density of 1.21 g/cm3. Object B has a density of 1.37 g/cm3. Both are placed in a beaker of water. Which will float higher in the water?
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Balance equation: _NO + _H2O = _NH3 + _O2
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Which is usually associated with a faster reaction rate?A.diluting a solution of the reactantsB.adding modeling clay to the reactantsC.removing heat energy from the reactantsD.using a solid with a high surface area in the reactants
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Which picture shows how the moon from earth when its in the position
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How might an antioxidant prevent another element from gaining or losing an electron?
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How are plastic containers different from paper containers? How are they the same?
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Indicate which molecules demonstrate the correct bonding for carbon atoms. Check all that apply.CH4CH3CH4CH2CH3CH2CH2CH3CH2CH2CH4The correct answer is:CH4 CH3CH2CH2CH3
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What is the purpose of the part of the male reproductive system that ishighlighted below?A. Mixes sperm and semenB. Creates the fluid in semenC. Manufactures sperm cellsD. Stores sperm cells until they matureO
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What do half-reactions show?OA. They show the oxidatign and reduction halves of a reaction.B. They show only the electrons that are transferred in a reaction.C. They show the reactant half and the product half of a reaction.D. They show the ionic equation and the spectator ions of a reaction.
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Explain why many Lewis acids and bases are not classified as Arrhenius or Brnsted-Lowry acids and bases
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Where is the blood first filtered?WXYZ
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Two atoms of the same element
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1. How much 6.0 M HNO3 is needed to neutralize 39 mL of 2.0 M KOH?2. How much 3.0 M NaOH is needed to neutralize 30. mL of 0.75 M H2SO4?3. What is the concentration of 20 mL of LiOH if it is neutralized by 60 mL of 4 M HCl?4. What is the concentration of 60 mL of H3PO4 if it is neutralized by 225 mL of 2 M Ba(OH)2?5.How much 2 M HBr is needed to neutralize 380 mL of 0.1 M NH4OH?
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