Answers edited by Jarni Renz

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• How do you solve #x = y + 3# and #2x + y = 9# using substitution?
  
• Question #fb855
  
• Question #719a9
  
• Question #e7eb1
  
• Question #b5376
  
• Question #a0976
  
• 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?
  
• Question #c87b5
  
• 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?
  
• How to simplify #6.2 times 10^3 + 4.5 times 10^2 # in scientific notation?
  
• Question #1aa06
  
• Question #449b7
  
• How do you use PEMDAS to simplify #4(9-6)^2#?
  
• 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?
  
• Question #06d81
  
• Question #71843
  
• Question #d0f0e
  
• How to simplify #(2times10^-4) (3times10^2)# in scientific notation?
  
• How do you simplify each expression using positive exponents #m^3 n^-6 p^0#?
  
• Question #41282
  
• Question #115aa
  
• How many grams of #CuSO_4# are present in 652 mL of .250 M #CuSO_4# solution?
  
• What is the volume of a solution that has a specific gravity of 1.2 and a mass of 185 g?
  
• How do you prove #cosx= 1/(cosx-sinx tanx)#?
  
• 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?
  
• 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#?
  
• How do you balance #NH_3(g) + O_2(g) -> N_2(g) + H_2O(g)#?
  
• Question #55b04
  
• In the reaction #4Fe + 3O_2 -> 2Fe_2O_3#, how many grams of #Fe_2O_3# are produced from #73.2g# #Fe#?
  
• Question #e7d7a
  
• Question #c65e7
  
• How do you solve #7x+30 =-5#?
  
• Question #425b9
  
• Question #54da7
  
• Question #a1c07
  
• Question #292bf
  
• 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"#
  
• Question #89a6e
  
• Question #1bdae
  
• Question #1cb20
  
• Question #8d154
  
• How do you solve #4y - 1/10 = 3y + 4/5#?
  
• 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?
  
• Question #1830f
  
• How do we represent the #"sulfate ion"#?
  
• How do you write #0.045# in scientific notation?
  
• 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?
  
• Question #3dbe1
  
• A wood fire burns at 260 °C. What is the temperature in Fahrenheit?
  
• 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"#
  
• Question #8994e
  
• 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?
  
• What mass of #"potassium chlorate"# is necessary to generate a #5.5*g# mass of oxygen gas?
  
• 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.
  
• Question #f16a3
  
• How do we represent the heat evolved in exothermic reactions?
  
• 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?
  
• 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?