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Which of these equations is balanced? a. H2SO4 + 2Al → Al2(SO4)3 + H2 b. 2KCl + Pb(NO3)2 → 2KNO3 + PbCl2

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What were the first 10 elements of the periodic table?

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An aqueous solution of potassium sulfate (K2SO4) has a freezing point of –2.24 oC. What is its molality? (Kf = 1.86 oC•m–1)

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You have lost nearly 6 inches of top soil on your 200 acre field in the last 10 years. The problem seems to be getting even worse as drought has taken hold of your area. What are some possible solutions that you would consider to reduce your soil erosion problem?

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Why are metals good conductors of heat and electricity? A.) anions rotate around the stationary electrons B.) cations rotate around the stationary electrons C.) free moving atoms in metals carry both heat and electric current D.) free moving electrons in metals carry both heat and electric current free moving protons in metals carry both heat and electric current

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List the 4 main components of air in their molecular form.

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What element behaves MOST like magnesium between Si, S, Sr, Sn

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Calcium and bromine have formed a bond. Leading up to this, calcium gave up electrons. It was a(n) ____. negative ion shared ion positive ion neutral atom

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Which statement best explains why a carbon atom can bond easily with other atoms? It is an ion. It is an organic element. It has four valence electrons. It forms hydrogen bonds.

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In the following reaction, how many grams of oxygen will react with 10.47 grams of benzene (C6H6)? 2C6H6 + 15O2 12CO2 + 6H2O The molar mass of benzene is 78.1074 grams and that of O2 is 32 grams.

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Which of the following statements is true about catalysts? and Why? a. Catalysts slow down the rate of chemical reactions b. All catalysts are enzymes c. Catalysts are used up during a chemical reaction d. Catalysts lower the activation energy of a chemical reaction

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You carefully weigh out 14.00 g of CaCO3 powder and add it to 56.70 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 64.96 g . The relevant equation is CaCO3(s)+2HCl(aq)→H2O(l)+CO2(g)+CaCl2(aq) Assuming no other reactions take place, what mass of CO2 was produced in this reaction?

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A compound contains 69.94 percent iron and 30.06 percent oxygen. What is its molecular formula if the molar mass of the compound is 199.55 grams per mole?

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Which of the following are most likely to form a metallic bond? several gold atoms copper and chlorine magnesium and chlorine several chlorine atoms

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The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2. How many moles of CO2 are produced when 35.0 mol C2H2 react completely? How do you get 35.0 mol out of C2H2?

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Which shows the correct relationship? A.) Eo cell > 0 = nonspontaneous reaction B.) Eo cell > 0 = spontaneous reaction C.) Eo cell = 0 = nonspontaneous reaction D.) Eo cell

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Monel metal is a corrosion-resistant copper-nickel alloy used in the electronics industry. A particular alloy with a density of 8.80 g/cm3 and containing 0.073% Si by mass is used to make a rectangular plate that is 15.0 cm long, 12.5 cm wide, and 2.50mm thick and has a 2.50-cm-diameter hole drilled through its center such that the height of the hole is 2.50mm . The silicon in the plate is a mixture of naturally occurring isotopes. One of the those isotopes is silicon-30, which has an atomic mass of 29.97376 amu and a percent natural abundance of 3.10% How many silicon-30 atoms are found in this plate? Express your answer numerically using two significant figures.

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Which of the following statements about ionization energy is true? A. In a period, elements farther to the right generally have lower ionization energies than elements on the left. B. Elements toward the bottom of a group periodic table generally have higher ionization energies than elements at the top of the group. C. Ionization energy is the amount of energy used to add an electron to an atom. D. Potassium has a lower ionization energy than sodium.

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Draw a complete Lewis structure for the conjugate acid of nitromethane that shows all bonds, unshared electron pairs, and minimized formal charges, where appropriate.

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An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 2.50g of this compound produced 3.67g of carbon dioxide and 1.50g of water. How many moles of carbon, C, were in the original sample?

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A teacher makes the following statement. “Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.” What topic is the teacher most likely talking about? a. distillation of a mixture b. filtration of a pure substance c.evaporation of a mixture d. sorting of a pure substance

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Which of the following ions would represent the ion of an element from Group 2A? A. X2- B. Y3+ C. Z+ D. A2+

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Which of the following statements about the use of nuclear energy is true? a. Nuclear energy cannot be used safely. b. Nuclear fusion has no known useful applications. c. Nuclear fission is currently more useful for producing energy than nuclear fusion. d. Nuclear fusion has fewer safety risks than nuclear fission.

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Which statement best characterizes chemical reactions? They always occur very quickly. Their rates vary significantly. Their rates are always slow. They rarely occur in the natural environment.

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Identify the group of elements that corresponds to the following generalized electron configuration: [noble gas]ns 2 (n−1)d 2

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Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds? It can be shaped into wires. It has a low melting point. It conducts electricity when in solid form. It conducts electricity when it is dissolved in water.

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What does newtons third law say about why momentum is conserved in collisions?

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What are elements are common to most matter

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Which scientist arranged the elements in order of increasing atomic number, rather than increasing atomic mass

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Which statement best relates the strength and concentration of a base? At high enough concentrations, a weak base becomes strong. Even at low concentrations, a strong base is strong. A weak base always has a low concentration. The stronger the base, the higher its concentration.

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