Step-by-Step Chemistry Tutorials for Easy Learning

calculate the percent composition of glucose when a 12.5 g sample of glucose was found to be composed of 6.66 g oxygen, 5.00 g carbon, and 0.84 g hydrogen
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calcium reacts with sulfur (s8) forming calcium sulfide. what is the theoretical yield (g) of cas(s) that could be prepared from 1.47 g of ca(s) and 4.56 g of sulfur(s)?
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after making your 10% solution, you will then pour 10 ml of it into an empty beaker. how much water (in ml) should you add to the beaker to create a 5% solution?
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You prepare a stock solution that has a concentration of 2. 5 m. An aliquot with a volume of 10. 0 ml is removed from the solution. What is the concentration of the aliquot?.
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What is the molarity of a solution prepared by dissolving 20.0 grams of naoh in sufficient water to make a solution with a total volume of 2.40 liters? 0.120 m naoh 0.208 m naoh 0.416 m naoh 0.833 m naoh
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What is the name of the following compound? 4-pentanamine 1-propyl-1-propanamine 3-hexanamine 1-propyl-3-ethanamine heptanal
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the standard enthalpy of fusion of 1.0 mole of a compound is 10 kj at its melting point of 200 k. what is the entropy change for the melting 2.0 mole of this compound at its melting point?
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decide whether a chemical reaction happens in either of the following situations. if a reaction does happen, write the chemical equation for it. be sure your chemical equation is balanced and has physical state symbols.situationchemical reaction?chemical equationa strip of solid copper metal is put into a beaker of 0.088m pb(no3)2 solution.yesnoa strip of solid lead metal is put into a beaker of 0.050m cu(no3)2 solution.yesno
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a 240.0 gram piece of copper is dropped into 400.0 grams of water at 24.0 c. if the final temperature of water is 42.0 c, what was the initial temperature of the copper piece? specific heat of copper
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gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated naoh(aq). calculate the amount of ga(s) that can be deposited from a ga(iii) solution using a current of 0.560 a that flows for 70.0 min. mass:
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13. write the balanced net ionic equations for the following reactions in acidic solution. a. mg(s) + vo4 3- (aq) mg2+(aq) + v2+(aq) b. i - (aq) + io3 - (aq) i3 - (aq)
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a scientist wants to make a solution of tribasic sodium phosphate, na3po4 , for a laboratory experiment. how many grams of na3po4 will be needed to produce 325 ml of a solution that has a concentration of na ions of 1.40 m ?
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what effect would poor circulation of the melting point bath on the observed melting point?
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you are given a metal cube. one of its edges measures 1.8 cm. it has a mass of 5.00 grams. imagine that the substances in the table are in a graduated cylinder and are separated into layers based on their densities. if you drop the metal cube into the graduated cylinder, what two substances is the metal cube most likely touching?
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if the mass of a calcium atom is 2.11 times the mass of a fluorine atom, then the mass of a calcium atom is...
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A 25. 0 g sample of warm water at 40. 0c was added to a 25. 0 g sample of water in a styrofoam coffee cup calorimeter initially at 20. 0c. The final temperature of the mixed water and calorimeter was 29. 5c. Calculate the heat capacity of the coffee cup calorimeter. The specific heat of water is 4. 184 j/gc.
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a. the vapor pressure of bromobenzene at 40c is 10 mm hg. determine the phase of bromobenzene at 40c, 1 atm. b. the normal boiling point of fluorobenzene is 84.7c. what is the phase of fluorobenzene at 25c, 1 atm?
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You have a beaker of water with a pH of 7. Which of the following solutions would you add to the water to change the pH to 4
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Warning signs are sometimes placed on aerosol cans to prevent people from throwing them into a fire. What is true about the gas in the aerosol can after it is placed in a fire
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the empirical formula of a group of compounds is chcl lindane a powerful insecticide is a member of this group
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current passes through a solution of sodium chloride. in 1.00 second, 2.681016na ions arrive at the negative electrode and 3.921016cl ions arrive at the positive electrode.
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a red blood cell is placed into each of the following solutions. indicate whether crenation, hemolysis, or neither will occur. solution a: 3.4 %% (m/v) naclnacl solution b: 1.77 %% (m/v) glucose solution c: distilled h2oh2o solution d: 8.34 %% (m/v) glucose solution e: 5.0%% (m/v) glucose and 0.9%% (m/v) nacl
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calculate the molarity (m) of a solution prepared by dissolving 9.8 moles of solid naoh into 3.62 l of solution.
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give an order of magnitude estimate for the ratio of the electric force between two electrons 1 m apart
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