Master Chemistry with Fun Quizzes & Brain Teasers!

a beaker contains an aqueous solution of sodium acetate (nac2h3o2). a few crystals of sodium acetate are added to the beaker. they sink to the bottom of the beaker and appear unchanged even after further mixing. what can you conclude about the level of saturation of the solution?
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Which scientist help developed the current model of the atom which states that electrons are located in regions known as orbitals or electron clouds?a. Neils Bohrb. Erwin Schrodingerc. Earnest Rutherfordd. Max Plancke. James Cahdwick
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0.87 grams of nitrous acid is mixed with potassium hydroxide, find the mass of each in grams. Find the pH of the acid and pOH of the base.
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Question: An atom from group 2A forms an ionic bond with an atom from another group. Which group is the second atom MOST LIKELY from?
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You measure the flame of a candle and get a reading of 1,376.06 K. This value is equal to
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ANSWER ASAP FOR 90 POINTS Question: Air pressure is... A.high and low at the bottomB. same at the top same at the bottom C.low at the top low at the bottomD.low at the top hight at the bottom
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A common liquid contains 11.19% hydrogen and 88.81% oxygen by mass. a) Calculate the number of moles of hydro- gen atoms and oxygen atoms in 100.0 g of this liquid b) Calculate the number of hydrogen and oxygen atoms in 100.0 g of this liquid.(those aren't very important I already solved them) c) Knowing that the molar mass of this liquid is 18.00 g.mol', calculate how many moles of hydrogen atoms, and how many moles of oxygen atoms are present in a mole of this substance. d) What is the number of hydrogen and oxy- gen atoms present in one molecule of this substance. Deduce the molecular mass of this liquid and write its molecular formula.
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What information about a molecule helps determine the type of intermolecular forces that will exist between molecules?A) atomic numberB) period numberC) molecular polarityD) molecular mass
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Carter pushes a bag full of basketball jerseys across the gym floor. Then he pushes with a constant force of 21 newtons. If he pushes the bag 9 meters in 3 seconds, how much power does he use? (Hint: 1 watt = 1 .) A. 3 watts B. 7 watts C. 27 watts D. 63 watts E. 189 watts
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how are components separated using distillation? the substance with the [ select ] vapor pressure is vaporized first, and then it is
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how many electrons must hte atoms of the elements below share with other atoms in covalent bonding to achieve an octet of electrons?
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true or false: the first step in the hydrogen burning process is a helium atom fusing with a hydrogen atom.
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461 j of energy is transferred to a system consisting of 2.0 moles of an ideal gas. if the volume of this gas stays at a constant 3.4 l, calculate the change in internal energy of the gas.
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lead crystallizes in a face-centered cubic structure. what is the edge length of the unit cell if the atomic radius of lead is 175
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calculate the molarity of hcl when the mass percent is 6.640 % . the density of the solution is 1.012 g/ml.
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in a closed system at 40 c a liquid has vapor pressure of 50 kpa. the liquids normal boiling point would be
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a component of smog, no2, may form in the following reaction: 2 no (g) o2 (g) --> 2 no2 (g) if 3.49 l of no are mixed with 2.00 l of o2, what is the maximum volume of no2 that will form?
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calculate the volume in liters of a zinc oxalate solution that contains of zinc oxalate . round your answer to significant digits.
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what is the solubility (in moles/liter) of pbcl2 in a solution that is 0.15 m solution in hcl? (ksp pbcl2
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Isobars are an important feature shown on weather maps. They join up points which have equal values of.
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write the electron configuration of an atom of the element highlighted in this outline of the periodic table: hint: you do not need to know the name or symbol of the highlighted element!
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a worker isolates 2.675 g of sif4 after reacting 2.339 g of sio2 with hf. what are the units on theoretical yield , actual yield and percent yield for this problem?
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a 1.50 g sample of hydrocarbon undergoes complete combustion to produce 4.40 g of co2 and 2.70 g of h2o. what is the empirical formula of this compound? in addition, its molecular weight has been determined to be about 78. what is the molecular formula?
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Based on your data and using deductive reasoning, what can you conclude about the trends in the solubilities of the compounds of the alkaline earth metals?
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