Answers edited by Jarni Renz
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Question #06d81
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An astronaut with a mass of 85 kg is floating in space. If the astronaut throws an object with a mass of 20 kg at a speed of 5/8 m/s, how much will his speed change by?
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How do you prove cosx= 1/(cosx-sinx tanx)?
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The density of platinum is 21.5 g/cm^3 at 25°C. What is the volume of 79.5 g of platinum at this temperature?
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Question #3dbe1
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How do you solve x = y + 3 and 2x + y = 9 using substitution?
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How do you solve 4y - 1/10 = 3y + 4/5?
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Question #719a9
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Question #115aa
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Question #71843
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Question #292bf
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Question #e7d7a
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In the reaction 4Fe + 3O_2 -> 2Fe_2O_3, how many grams of Fe_2O_3 are produced from 73.2g Fe?
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Question #8d154
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Question #54da7
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How do you write 0.045 in scientific notation?
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Question #41282
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Use the tabulated density of water at 17 degrees celsius to calculate the theoretical mass of water (in grams) that should be delivered by a "10.00 mL" pipet? Density of water at 17^@ "C" = "0.998778 g/mL"
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What is the volume of a solution that has a specific gravity of 1.2 and a mass of 185 g?
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In the reaction 2NaOH+H_2SO_4 -> 2H_2O+Na_2SO_4, how many grams of sodium sulfate will be formed if you start with 200.0 grams of sodium hydroxide and you have an excess of sulfuric acid?
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Question #f16a3
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How do you simplify each expression using positive exponents m^3 n^-6 p^0?
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How do we represent the "sulfate ion"?
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How do we represent the heat evolved in exothermic reactions?
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How to simplify (2times10^-4) (3times10^2) in scientific notation?
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A wood fire burns at 260 °C. What is the temperature in Fahrenheit?
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Question #425b9
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Question #89a6e
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Sharon purchased land in 1970 for $40,000. That land increased in value approximately 3% per year. In 2005 Sharon decided to sell the land. How much could she reasonably ask as a selling price?
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Question #55b04
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If 0,5kg of dextrose is dissolved in 600ml of water to produce a solution with a final volumeof 1000ml what is the percentage w/w strength of the solution?
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How do you balance NH_3(g) + O_2(g) -> N_2(g) + H_2O(g)?
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How do you solve 7x+30 =-5?
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Question #e7eb1
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1.91 g H2 is allowed to react with 9.86 g N2, producing 1.74 g NH3.
What is the theoretical yield in grams for this reaction under the given conditions?
Express your answer to three significant figures and include the appropriate units.
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Question #1bdae
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What mass of "potassium chlorate" is necessary to generate a 5.5*g mass of oxygen gas?
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The annual interest rate of Erika's savings account is 6.4%, and simple interest is calculated quarterly. What is the periodic interest rate of Erika's account?
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Question #b5376
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How do you use PEMDAS to simplify 4(9-6)^2?
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Question #c65e7
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An object with a mass of 120 g is dropped into 800 mL of water at 0^@C. If the object cools by 30 ^@C and the water warms by 5 ^@C, what is the specific heat of the material that the object is made of?
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What is the density of a piece of wood that has a mass of 25.0 g and a volume of 29.4 cm^3?
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Aluminum sulfate, Al_2(SO_4)_3, decomposes to form aluminum oxide, Al_2O_3, and sulfur trioxide, SO_3. How do you write the balanced equation for this reaction?
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Question #449b7
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Question #1aa06
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Question #d0f0e
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Question #1830f
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How to simplify 6.2 times 10^3 + 4.5 times 10^2 in scientific notation?
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Question #1cb20
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The combustion of butane, C_4H_10, produces carbon dioxide water. When one sample of butane was burned, 4.46 grams of water was formed. How many grams of oxygen gas were consumed?
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What was the heat lost from the system if "5.25 g" of water was cooled from 64.8^@ "C" to 5.5^@ "C"? C_P = "4.184 J/g"^@ "C"
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Question #a1c07
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Question #a0976
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Question #c87b5
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Question #8994e
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How many grams of CuSO_4 are present in 652 mL of .250 M CuSO_4 solution?
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Question #fb855