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Write the reaction responsible for the formation of bubbles. alka-seltzer, a drugstore antacid, contains a mixture of nahco3, aspirin, and citric acid, c6h5o7h3.
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If the vapor pressure of ethylene glycol is 7.23 mm hg at 95.1°c and 755 mm hg at 197.1°c, what is the heat of vaporization of ethylene glycol?
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How many grams of helium must be released to reduce the pressure to 73 atm assuming ideal gas behavior?
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Calculate the amount of heat needed to melt 104.g of ice ( h2o ) and bring it to a temperature of 12.2°c . be sure your answer has a unit symbol and the correct number of significant digits.
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Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4nh3 + 5o2 ï® 4no + 6h2o what is the theoretical yield of water, in moles, when 40.0 g nh3 and 50.0 g o2 are mixed and allow
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In a double-displacement reaction, sodium sulfide, Na2S, reacts with silver nitrate, AgNO3, to form sodium nitrate, NaNO3, and silver sulfide, Ag2S. Balance this equation.
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Which is the best term to use when describing the energy of position? chemical kinetic potential electromagnetic
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Which statement correctly describes the actual yield and the theoretical yield of a reaction? The actual yield is calculated from the reactant amounts, but the theoretical yield must be measured for e
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The mass of the sun is 1.989 x 10^30 kg, and the mass of the earth is 5.974 x 10^24 kg. How many Earths would be needed to equal the mass of the sun?
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The Dalton model of the atom predicted which of the following? A. Electrons are embedded in a sphere. B. Atoms can be broken down into smaller components. C. Atoms have a nucleus. D. All matter is
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When are elements most likely to become unreactive? when they share all of their valence electrons when their valence shell is completely full when they have lost all of their valence electrons wh
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Describe the composition of the nucleus of an atom. A) It is composed of protons. B) It is composed of protons and neutrons. C) It is composed of protons and electrons. D) It is composed of protons, n
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Match the term with its description. Match Term Definition Colloid A) A mixture in which two or more liquids are mixed that normally are not mixable Emulsion B) Mixture that has its different componen
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Which statement best describes the types and locations of particles that make up the atom? A. The neutral-charged neutrons and positive-charged protons are found within the nucleus, and the negative-c
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If δh = -60.0 kj and δs = -0.400 kj/k , the reaction is spontaneous below a certain temperature. calculate that temperature.
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A standard solution is prepared by dissolving 10.6192 g of (nh4)2ce(no3)6 (548.23 g•mol-1, 98.75% purity) in dilute sulfuric acid. the resulting solution is quantitatively transferred to a 500.0-ml
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Based on ionic charge and ionic radaii given in table 12.3, the predicted coordination number for calcium atoms in cao would be:
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When an electron jumps from a high energy state to a lower state, what form does the emitted energy take? A) an emitted proton B) an emitted ion C) an emitted photon D) an emitted neutron
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Sort each of the molecular representations again, but this time identify which molecules will hydrogen-bond (hb) with water molecules and which will not.
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Compare and contrast active transport and passive transport. Include at least one similarity and one difference between the two processes.
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Krypton gas in an 18.5-L cylinder exerts a pressure of 11.2 atm at 28.2 0C. How many grams of krypton are present? The answer is supposed to be 702g but I get 8.24 g and I can't tell what I'm getting
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Which of the followimg is an example of a physical change but not a chemical change?A. A log gives off heat and light as it burns.B. A tree stores energy from the Sun in its fruit.C. A penny lost in t
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What term describes the state of matter in which the attractive forces between particles are the greatest?
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Iron combines with oxygen to form rust. Given the chemical reaction, how many grams of 4Fe + 3O2 would produce 10 kg of rust?
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Latanya Brown is a nine-year old African American who is hospitalized with acute sickle cell crisis. The pharmacist is preparing intravenous fluids for this patient. She adds 2 grams of potassium chlo
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When a 2.00-g sample of kbr is dissolved in water in a calorimeter that has a total heat capacity of 0.7271 kj·k–1, the temperature decreases by 0.460 k. calculate the molar heat of solution of kbr
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The chlorofluorocarbon ccl2f2 was once used as a refrigerant. what mass of this substance must evaporate to freeze 2 mol water initially at 20°c? (δhvap for ccl2f2 is 289 j/g; δhfus for solid ice i
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How many electrons could be held in the second shell of an atom if the spin quantum number ms could have three values instead of just two? (hint: consider the pauli exclusion principle.)?
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Cd(s) | cd2+(1.0 × 10-5 m) || cd2+(0.100 m) | cd(s) given that e°red = -0.40 v for cd2+/cd at 25°c, find e° and e for the concentration cell expressed using shorthand notation below. cd(s) | cd2+(
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A 55.0-g aluminum block initially at 27.5 ∘c absorbs 725 j of heat. what is the final temperature of the aluminum? express your answer in degrees celsius to one decimal place.
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Which of the following pairs of elements could possibly be found in the same group on the periodic table? A forms a 2+ ion; B is an alkaline earth metal. A is a noble gas; B forms a 1- ion. A has 3 va
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Which of the following pairs of elements could possibly be found in the same group on the periodic table? A forms a 2+ ion; B is an alkaline earth metal. A is a noble gas; B forms a 1- ion. A has 3 va
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types of reactions and predicting reactions
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Which type of mixture contains the largest particles? solution suspension colloid varies according to the composition of the mixture
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Which answer choice correctly describes why the isotope oxygen-18 (18O) is different from the isotope oxygen-16 (16O)? Its atomic number is different because it has two more neutrons. Its atomic numbe
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Which of the following environments would most likely allow the evolution of antibiotic resistant bacteria? A A home with one family and occasional use of antibiotic soaps B An airport with a very div
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An ancient copper coin was found to absorb 545.8 j of heat when the tempature increases 31.4+c. the specific heat of copper is 0.387 j/g+c. what is the mass of the copper coin?
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Why coordination compounds are called coordination compounds and why they are called complex? Why this names is given to them
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When 15.0 kJ of heat was absorbed by 1.00 kg of liquid dichlorodifluoro- methane, CCl2F2, the temperature rose from 26.1 °C to 51.0 °C a) What is the specific heat of the compound? b. What is the mo
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A magnuson act states that fisheries management officials must pay attention to protecting fish habitat. which of the following fishing techniques would be most destructive to fish habitat? A) Drift n
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Illustrate how the effect of dipole to dipole interaction between two molecules affect their boiling point
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Acetic acid is a weak acid that forms a salt with a strong base, NaOH. What kind of salt will be formed? acidic salt increasing the pH of the solution acidic salt decreasing the pH of the solution bas
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Potassium hydroxide, KOH, is considered a _____________ in an acid-base reaction because it ___________ a hydrogen ion to/from the other reactant.
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Sketch a graph of what the density of silver would look like if we had lots of samples of different masses and volumes.
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Which statement describes the acid found in vinegar (acetic acid)? It tastes bitter. It feels slippery. It changes red litmus paper to blue. It reacts with Mg to produce H2. It releases OH- in a so
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Which of the following is a reasonable ground-state electron configuration? 1s22s22p63s23p64s24d4 1s21p62s22p3 1s22s22p63s23p64s23d1 1s22s22p43s2
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What is the molar volume of a gas at standard temperature and pressure? A . 1.0 L B. 2.4 L C. 11.2 L D. 22.4 L
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If the measured voltage of the cell zn(s) | zn2 (aq) || ag (aq) | ag(s) is 1.37 v when the concentration of zn2 ion is 0.010 m, what is the ag ion concentration
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Give two real-life examples where changing the volume and/or the temperature of a gas results in a change in pressure
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Consider the reaction mg(s)+fe2+(aq)→mg2+(aq)+fe(s) at 47 ∘c , where [fe2+]= 2.80 m and [mg2+]= 0.210 m . part a what is the value for the reaction quotient, q, for the cell? express your answer n
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