Master Chemistry with Fun Quizzes & Brain Teasers!

1. 4 g of calcium chloride reacts with excess potassium. Determine the molar enthalpy for the reaction of calcium chloride if in the calorimeter the temperature of the 7. 5 g solution goes from 15 C to 32 C. Assume that the solution is mainly water
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100 POINTS PLEASE HELP!!! 1. Explain how you would determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) 2AX3(g) using the following information. You do not need to calculate an answer. Respond to the prompt with a minimum response length of 50 words.
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If the boiling point of ethanol went up 6. 8 degrees, how many grams of PbCl4 were added to 2700 grams of ethanol? round to nearest tenth
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An aircraft flying from a region of higher air pressure towards a region of lower air pressure will _____ altitude, and the aircrafts pressure altimeter will read an altitude _____ than the planes true elevation, unless corrections are made to the altimeter
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Illustrate that the mass of an atom of element X is equivalent to the total mass of 7 hydrogen atoms. Name the element represented by X?
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Which refers to a phenomenon that occurs as solar radiation is absorbed by Earths surface and re-radiated into the atmosphere, where it gets trapped and warms the Earth? energy budgeting greenhouse effect solar circulation incoming radiation
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2H2 + 1O2 --> 2H2OSuppose you had 20. 76 moles of H2 on hand and plenty of O2, how many moles of H2O could you make?
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At high altitudes, pressure decreases to 0. 5 atm. Non-smokers can breathe 7. 2L of air per minute. How many liters of air can they breathe at sea level? (1 atm)
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If earth had no atmosphere, its longwave radiation emission would be lost quickly to space making the planet approximately 33 K cooler. Calculate the rate of radiation emitted E and the wavelength of maximum radiation emission for earth at 255 K.
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A certain chemical reaction releases 34. 5/kJg of heat for each gram of reactant consumed. How can you calculate what mass of reactant will produce 1370. J of heat?
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If 25. 5 mL of a 0. 1 M base solution was required to titrate 60 mL of an unknown acid solution, what is the molarity of the acid solution?
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A 7. 15L balloon filled with gas is warmed from 256. 1K to 297. 1 K. What is the volume of the gas after it is heated?
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how does hydrogen peroxide contribute to photochemical smog?
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What is it called when a disease can affect plants and animals and can cause them to struggle to survive?
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researcher studying the nutritional value of a new candy places a 3.60 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. the observed temperature increase is 2.07 c. if the heat capacity of the calorimeter is 29.40 kjk1, how many nutritional calories are there per gram of the candy?
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How much heat in calories is needed to raise the temp of 125. 0g of lead (Clead=0. 130J / g Celsius) from 17. 5 Celsius to 41. Q Celsius
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Determine the number of moles of c2o4 in a sample with 0.48 moles of mno4 at endpoint
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Question 2:heat (5 points) a. Describe the following heat equations and identify the indicated variables. (3 points) I. Q= mct; identify c. (1 point) ii. Q=ml vapor; identify l vapor (1 point) iii. Q= ml fusion; identify l fusion (1 point)
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Converting mass to moles ccc scale proportion and quantity the table shows how many moles are in 6 grams of four elements the equation shows how to use carbon molar mass to find the moles of carbon
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Which term describes a pure substance that iscomposed of only one type of atom?
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Calculate the pH of 0. 10 M solution of hypochlorous acid, HOCl, Ka = 2. 9 x 10-8
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The surface of a pool table has a perimeter of 26 feet and an area of 40 square feet. What are the dimensions of the pool table?
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The gas inside of neon signs is kept at extremely low pressures (27. 0 torr). While the sign is on the 1. 075 x 10-4 moles of gas reaches a temperature of 42. 6 C. What volume of gas is in the sign?
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Biodiversity contributes to the sustainability of an ecosystem because
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