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Which of the following represents a physical change in matter?
Select one:
a. A substance solidifies at 75°Cb. A substance produces a gas when heatedc. A substance burns when heatedd. A substance changes color when exposed to air.
The horizontal end of length L is closed but the vertical end is open to the atmosphere. A fluid of density (p) fills the tube to a height H and the tube is rotated about the vertical axis at rotational speed w. Find the gage pressure at the close..
Small helium-neon lasers emit 2.94 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
What is the molar heat of formation for liquid water
in industry sodium carbonate is produced in two stages whose equations are as followsnacl nh3 h2o co2 agrave nh4cl
Determine the mass of sodium hydroxide produced when 0.47g of sodium nitrite reacts with water according to the following equation:
Nitrogen dioxide (NO2) cannot be obtained in a pure form in the gas phase because it exists as a mixture of NO2 and N2O4. At 25°C and 0.98 atm, the density of this gas mixture is 2.7 g/L.
Explain how three features of the FastTrack Schedule 9's features will help you manage information systems projects. Be specific in relating the feature to the systems tasks you would want to achieve with it.
Estrone is a female sex hormone that is known to contain 80.0% carbon, 8.2% hydrogen, and the remainder oxygen. If 793mL of estrone is found to have a mass of 4.97g at 0.90atm and 200oC, find the molecular formula for estrone.
0.982 g sample of KHP (this is not potassium-hydrogen-phosphorus) is dissolved in water and titrated to the equivalence point with 26.45 mL of NaOH solution. What is the concentration (M) of the NaOH solution
Find vapor pressure and density of liquid water at room temperature; state your source. Calculate the new vapor pressure of water at the same temperature when 740 torr of dry
If a solution is made by mixing 20.0 mL 0.4 M NaCH3COO with 30 mL 0.4 M CH3COOH, calculate the pH of the solution? For acetic acid, K = 1.76 x 10-5
Explain the general principle of chromatography. Please include discussion on retention time, mobile phase, and stationary phase.
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