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Balance the following equation. Then determine the ratio for the products KCl and O2 generated during the decomposition of potassium chlorate. KClO3 KCl + O2

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A method that uses a mathematical equation and the half-life of decay to determine the exact date of a fossil is known as __________.

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“you have a mixture made os two substances, one with a higher density than the other. how could you separate the substances in the mixture? A) boil the mixture so that the substances with the hightest densities turn into gas B) add electric current to the mixture, the one with most mass will split first. C) Freeze the mixtures because the substance with the lower density will turn solid first D) centrifuge the mixture because the substance with the highter density will be pulled to the bottom”

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In the reaction MgCl2 + 2KOH Mg(OH)2 + 2KCl, if 3 moles MgCl2 are added to 4 moles KOH, what determines how much Mg(OH)2 is made? A. The amount of MgCl2 + KOH B. The amount of KCl C. The amount of MgCl2 D. The amount of KOH

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Which of the following statements is true regarding a covalent bond in CO? Valence electrons are transferred to the oxygen atom. The bond length is less than the sum of the two atomic radii. Bonding electrons are stationary in the CO molecule. all of the above none of the above

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When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that A) it is a reactant in one intermediate reaction and a catalyst in the other reaction. B) it is a product in one intermediate reaction and a catalyst in the other reaction. C) it is a reactant in one intermediate reaction and a product in the other reaction. D) it is a reactant in both of the intermediate reactions.

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Which of the following correctly describes the decomposition of aqueous NaNO3? Given: NaNO3(aq):ΔH= –477 kJ The molar enthalpy is –447 kJ and the reaction is exothermic. The molar enthalpy is 447 kJ and the reaction is exothermic. The molar enthalpy is –447 kJ and the reaction is endothermic. The molar enthalpy is 447 kJ and the reaction is endothermic.

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Classify the following items based on the type of polymer they are made from: raincoats and leather shoes. A. Both are made from synthetic polymers. B. Leather shoes are made from natural polymers; raincoats are made from synthetic polymers. C. Leather shoes are made from synthetic polymers; whereas raincoats are made from natural polymers.

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Calculate ΔSrxn∘ for the reaction 2NO(g)+O2(g)→2NO2(g) SubstanceS∘ (J/mol⋅K) NO2240.0 O2205.2 NO210.8

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For questions #8 – 9 use the following pictures: A. B. C. 8. Which picture(s) would best represent atoms in the gas of a neon sign? Explain why. 9. Which picture(s) would best represent a rock? Explain why.

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The compound Aluminum Chloride has 3 chloride atoms. This compound can be represented by the chemical formula A) Al3Cl B) Al3Cl3 C) AlCl D) AlCl3

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How many total atoms are in H2O 12 4 10 3

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How many atoms are in a molecule of iron oxide (Fe2O3)? A. 3 B. 2 C. 1 D. 5

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Identify what type of reaction is below. Also determine what coefficients that would balance the chemical equation. ___ Fe(OH)2 → ___ FeO + ___H2O A) Single Replacement; 3, 1, 2 B) Decomposition; 1, 1, 1 C) Synthesis; 1, 1, 1 D) Combustion; 1, 1, 1

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For most substances,the distance between particles is furthest when the substance is?

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Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(l) Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide molecules to produce calcium carbonate faster? Lower the temperature. Use larger pieces of calcium hydroxide. Lower the pressure. Reduce the volume of the container.

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The molar mass of magnesium (Mg) is 24.30 g/mol. There are 6.02 mc022-1.jpg 1023 atoms in 1 mol. How many atoms are present in 48.60 g of Mg

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Which of the following is the electron configuration for an electrically neutral atom of oxygen? Use the periodic table if you wish. 1s22s22p6 1s22s22p44d2 1s22s2 1s22s22p4 Please help

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Match the following type of reactions to the correct equation. Pb(NO3)2 + 2HCl –> PbCl2 + 2HNO3 2C2H6 + 7O2 –> 4CO2 + 6H2O Ca + 2HCl –> CaCl2 + H2 H2O + CO2 –> H2CO3 CaCO3 –> CaO + CO2 ——————————- These are the choices for each they can be used once Decompitiontion Single Replacement Synthesis Combustion Double Replacement ——————————–

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!HELP! PLEASE HELP!!!!Compare what happens when NaCl and HCl are added to water. (Hint: They will both dissolve but they will do so differently. Pay close attention to the type of compounds they are.)

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3. List the three main parts of an atom and their electrical charges.

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The hydroxide ion concentration in pure water at 25ºC is NOT equal to A.the hydronium ion concentration. B.1 X 10^-7 M. C.the hydroxide concentration in a solution with a pH of 7. D.1 X 10^7 M.

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Acetic acid ionizes only partially in solution. What type of acid is acetic acid?

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The last element in any period always has: A.two electrons in the outermost energy level B.its outer energy level completed C.the properties of an inert gas D.the lowest atomic weight because it is a gas

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Substance tha have excess hydroxide ions (OH-) are

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Periodicity is best defined as: A. the fact that elements increase in atomic mass in a regular way B.the repeating nature of physical and chemical properties with atomic number C.the regular growth of atomic size with atomic mass D.the consistent decrease of nuclear charge with atomic mass E.the repeating nature of atomic nuclear structure

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Which type of biochemical is shown in the diagram? polysaccharide nucleic acid lipid dipeptide

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Can you please answer questions regarding valence electrons? How many valence electrons are in an atom of phosphorus? How valence electrons affect the properties of an atom? What are valence electrons and where are they located? What do valence electrons determine about an element? Are valence electrons involved in chemical bonding?

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What determines the metallic character of an element?

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What type of substances make better conductors? A. Substances with greater density. B. Substances with more surface area. C. Substances with less density. D. Substances with less surface area.

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