464 Answered Questions for the topic AP chemistry
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Encke’s comet revolves around the sun in a period of just over three years. The closest it approaches the sun is 4.95 × 10^7 km, at which time its orbital speed is 2.54 × 10^5 km/h. At what... more
OS Chapter 11 Items9. Calculate the freezing point of a solution of 400.0 g of ethylene glycol (C2H6O2) dissolved in 600.0 g of water. A) 80.0°C B) -5.5°C C) 20.0°C D) -20.0°C E) 5.5°C Kf =... more
What is the concentration of magnesium bromide, in ppm, if 133.4 g MgBr2 dissolved in 1.84 L water. then solve for the concentration of bromide in ppm
What is electron affinity?
What is first ionization energy?
What is a mass spectrum?
what does (n=5 to n=2) have to do with wavelength?
What has a greater ionization energy, an element with a positive, negative, or neutral charge?
What is more excited, an electron configuration that has two partially filled rings, or a halogen that is one proton away from being a noble gas (stable
What is the relationship between reactivity and ionization energy?
What mass of carbon is present in 8.02 x 10^23 formula units of Al2(CO3)3?
Pa-234 decays to U-234 with a half life of 1.17 minutes. A lead vessel contains 50.0 g of Pa-234 and 50.0 g of U-234. How many minutes ago did the vessel contain 100.0 g of Pa-234?
How many half-lives occurred if 5.2 x 10^24 atoms of Pb-212 decay into 0.54 miles of Bi-212? Round to nearest whole number.
For many purposes we can treat ammonia NH3 as an ideal gas at temperatures above its boiling point of -33 degrees celsius.
Suppose the temperature of a sample of ammonia gas is raised from -14.0 °C to 21.0 °C, and at the same time the pressure is changed. If the initial pressure was 6.5 atm and the volume increased by... more
Consider the following balanced reaction. HCl (aq) + KOH (aq) → H2O (l) + KCl (aq)
In a beaker, 250.0 mL of 0.25 M HCl and 200.0 mL of 0.40 M KOH are mixed. After reaction, is the solution acidic, neutral, or basic? What is the pH of the solution at the end of the... more
Calculate the pH of a 0.0065 M solution of NaOH. Report answer to two decimal places.
A student mixes 20.00 mL of 0.190 M Ca(NO3)2 and 12.00 mL of 0.150 M Na2CO3. What is the limiting reactant? Show your work.
How would your results (percent yield) be affected if you spilled some of your reaction mixture while trying to filter your product? Be specific and give an explanation.
What volume (in mL) of 4.46 M HCl is required to fully react with 19.3 mL of 2.13 M Ca(OH)2?
Consider the following balanced equation.2HCl (aq) + Ca(OH)2 (aq) 2H2O (l) + CaCl2 (aq)
Calculate the amount of heat absorbed (in kJ) when 35.15 g of CO2 reacts.
2Fe3O4 (s) + CO2 (g) 3Fe2O3 (s) + CO (g) H = 47.2 kJ
If 1.49 grams of NO react, how many grams of NO2 form?
Consider the following balanced reaction.2H+ (aq) + 2NO3- (aq) + NO (g) 3NO2 (g) + H2O (l)
Why does Kr have larger radius than Ar when Kr has a larger effective nuclear charge?
Looking at the atomic radius trend of the periodic table, Kr has a larger radius than Ar. But my textbook claims that Kr has a larger effective nuclear charge than Ar for n=3. Wouldn't that mean Kr... more
Consider the following balanced chemical equation: 2K3PO4 (aq) + 3MgBr2 (aq) ----> Mg3(PO4)2 (s) + 6KBr (aq)
A 97.17 mL sample of 1.4 M K3PO4 is mixed with 45.24 mL of 0.615 M MgBr2. After reaction, what is the concentration of the excess reactant (in M)?
Consider the following balanced chemical equation: 4Na (s) + O2 (g) ----> 2Na2O (s) . Calculate the volume of O2 gas (in L) needed at STP to react with 89 g Na.
A chemist prepares a solution of iron chloride by measuring out 0.10 g of FeCl2 into a 50. mL volumetric flask and filling to the mark with distilled water.
Calculate the molarity of anions in the chemist's solution.