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Chemical reactions will occur if the products are less stable than the reactants. true or false

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Saturated hydrocarbons with what length of carbon chain are the best lubricants? A.1–2 B.5–8 C.17–35 D.more than 35

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A benefit of using nuclear energy could be the abundance of uranium in nature. Which human risk about mining is the most important to consider? the use of a nonrenewable resource the location of storage of the radioactive waste the cost of setting up a uranium mine operation the health hazards that are associated with uranium mining

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What must occur for a change to be a chemical reaction? a. There must be a change in chemical properties. b. There must be a change in physical properties. c. The change must involve a change in mass. d. The change must involve a change in volume.

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Propane burns in air to produce carbon dioxide and water. What is this type of chemical reaction called?

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How many electrons are shared in the Lewis structure of CH2Cl2?

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The change of energy from one form to another results in _____. a chemical reaction the spreading out of energy due to heat flow the recapture of some spread out energy a combustion reaction

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Write the complete balanced equation for the reaction between aluminum metal (Al) and oxygen gas (O2). You do not need to make the subscripts smaller; just write them out as regular numbers. For example: O2.

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Calculate the standard emf for the following reaction: 2ClO3- (aq)+10Br-(aq)+12H+(aq) –> Cl2(g)+5Br2(l)+6H2O(l)

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Identify the elements that undergo changes in oxidation number in the reactions: •NaI(aq)+3HOCl(aq)→NaIO3(aq)+3HCl(aq) ___________ 3SO2(g)+2HNO3(aq)+2H2O(l)→3H2SO4(aq)+ 2NO(g) ________ •2H2SO4(aq)+2NaBr(s)→Br2(l)+SO2(g)+ Na2SO4(aq)+2H2O(l)

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Which of the following decomposition reactions is/are correct? A) 2NaOH 2Na + O2 + H2 B) 2NaOH 2Na + H2O + 1/2O2 C) 2NaOH Na2O + H2O D) 2NaOH 2Na + H2O2 Both reactions A & B are correct. Only reaction A is correct. Only reaction D is correct. Only reaction C is correct.

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An ionic compound formed by a neutralization reaction a. acid c. solvent b. base d. salt

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Which term refers to the formation of ions as a result of a chemical reaction? dissociation electrolyte hydration ionization

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The substances in a chemical reaction that are combined or separated to form new substances are the _______. reactants chemical equations coefficients products

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Calculate the delta S rxn at 25 degrees celsius for the reaction 2NH3(g)->>N2H4(g) + H2(g). Do you know where I can find these values of the S for these compounds?

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Based on reactivity, which of the following elements can replace iron (Fe) in a compound during a single replacement reaction? Al Cu F Co

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To create hydrogen and oxygen from water, you would need to perform which type of reaction? A. Synthesis B. Decomposition C. Single replacement D. Double replacement

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PLEASE HELP ! Which of the following is a sign of poor quality water? Zero turbidity A pH of 7.0 High phosphate content High dissolved oxygen

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Calorimetric studies show that the reaction is exothermic. 2NO2(g) N2O4(g) + 14.1 kcal. Based on this information, which one–if any–of the following additional changes would increase the molar concentration at equilibrium of N2O4(g)? decrease the pressure increase the temperature decrease the concentration of NO2(g) stir the reaction mixture none of the above

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Which statement is true when a crystal is formed from many metal atoms? A. There are no bands being formed. B.There are many molecular orbitals. C. There are only unshared atomic orbitals. D.There are many electrons lost to other atoms.

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During a chemical reaction, what remains constant? Composition Temperature Energy Bonds

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For which of the following reactions are both reactants and products likely to be found when the reaction appears to be complete? How can you tell? – Mg + O2 –> 2MgO – HF + H2O H3O(+) + F(-)

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8Fe + S8 –> 8FeS What type of chemical reaction is happening here? A) synthesis B) decomposition C) single replacement D) double replacement

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Which of the following is the best definition of Hess’ Law? A. Heat evolved in a given process can be expressed as the sum of the heats of several processes that, when added, yield the process of interest. B. The enthalpy of a process is the difference between the enthalpy of the products and the enthalpy of the reactants. C. Since enthalpy is a state function, it will be different if a reaction takes place in one step or a series of steps. D. At constant pressure the enthalpy change of a reaction is equal to the heat change of a reaction. E. Heat is always released by the decomposition of 1 mole of a compound into its constitute elements.

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Write out the balanced equation for the reaction that occurs when Ca(OH)2 and H3PO4 react together. You do not need to make your subscripts smaller; just write them out at regular numbers. For example: Ca(OH)2.

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Calculate the standard emf for each of the following reactions. H2(g)+F2(g)→2H+(aq)+2F−(aq). Cu2+(aq)+Ca(s)→Cu(s)+Ca2+(aq).

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How much heat (in kilojoules) is evolved or absorbed in the reaction of 1.90g of Na with H2O ? 2Na(s) + 2H₂O(l) -> H2(g) deltH = -368.4KJ.

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Describe what happens when two substances at different temperatures come into contact. Describe how the law of conservation of energy applies to this system.

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List a possible set of four quantum numbers (n,l,ml,ms) in order, for the highest energy electron in gallium?

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Materials that have high resistance to electric current are called ____________. electrical conductors voltage sources electrical insulators electrical anodes

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