Answers created by Sam
- Back to user's profile
-
Next
-
What is the ground state electron configuration for Zn ?
-
3.55 moles H_2 (g), 1.25 moles CO (g), and an unknown number of moles N_2 (g) were placed into a 5.00 L flask at 25.0^oC. Given the density of this gas mixture to be 19.92 g/L, how many moles of N_2 were in the flask?
-
58.5 is 13% of what number?
-
How is carbocation formed?
-
What is the pH of a 0.0453 M HCl solution?
-
How can you identify alkenes?
-
Question #f83f5
-
What mass of sodium benzoate should be added to 140.0 mL of a 0.15 M benzoic acid solution to obtain a buffer with a pH of 4.25?
-
The half-life of bromine-74 is 25 min. How much of a 6.0 mg sample is still active after 75 min?
-
How many moles of ethylene (C_2H_4) can react with 12.9 liters of oxygen gas at 1.2 atmospheres and 297 Kelvin?
-
Why are carbocations unstable?
-
How do you find a standard form equation for the line (2,-1) (0,-4)?
-
How can you test for ketones?
-
How many millliters of 2.75 M H_2SO_4(aq) are needed to react completely with 47.5 g of BaO_2(s)?
-
How can alkenes be used to make ethanol?
-
How many liters of carbon dioxide can be produced if 37.8 grams of carbon disulfide react with excess oxygen gas at 28.85 degrees Celsius and 1.02 atmospheres?
-
How many moles of copper are equivalent to 3.44*10^23 atoms of copper?
-
The half-life of cobalt-60 is 5.26 years. If 50 g are left after 15.8 years, how many grams were in the original sample?
-
How do you convert 225 mmHg into atmospheres?
-
What are the empirical and molecular formulas of nicotine?
-
How do you find the vertex of the parabola y=2x^2-5?
-
What is carbocation intermediate?
-
The freezing point of an aqueous sodium chloride solution is -0.20°C. What is the molality of the solution?
-
How many liters are in 16 grams of H_2 at STP?
-
The freezing point of an aqueous solution is -2.79°C. What is the boiling point of this solution?
-
Helium occupies 2.40 L at 123°C. What would the volume of the same sample of gas be at 23°C?
-
How do you find the vertex and intercepts for y = (1/8)(x – 5)^2 - 3?
-
What is 306,000,0000 in a scientific notation?
-
Which Lewis electron-dot diagram is correct for a "S"^(2-) ion?
-
A solution is prepared to be 0.1475 M in Sr(OH)2. How do you find the [H3O+], [OH‐], pH, and pOH?
-
The titration of 20.0 mL of an unknown concentration H_2SO_4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H_2SO_4 solution (in M)?
-
What mass of SbCl_3 can be produced from the reaction of 3.570 L of chlorine at STP reacting with an excess of antimony in the reaction Sb+Cl_2 -> SbCl_3?
-
What is the point of intersection of the lines y = 2x + 4 and x + y = -11?
-
An ideal gas sample is confined to 3.0 L and kept at 27°C. If the temperature is raised to 77°C and the initial pressure was 1500 mmHg, what is the final pressure?
-
What is the weight in grams of 3.36 * 10^23 molecules of copper sulfate CuSO_4?
-
If you had a 100-gram sample of plutonium, how much would still remain in 43 years?
-
How do you solve 2(6 - x) = x(x + 5) using the quadratic formula?
-
A 12.0 L sample of argon gas has a pressure of 28.0 atm. What volume would this gas occupy at 9.70 atm?
-
What does the number prefix tell you in the name of a branched alkane?
-
Polonium-214 has a relatively short half life of 164 s. How many seconds would it take for 8.0 g of this isotope to decay to 0.25 g?
-
How do you prove cos(x+y)cos(x-y)= cos^2x - sin^2y?
-
At approximately what pressure will water be a vapor a 0°C?
-
How many grams of Cl are in 515 g of CaCl_2?
-
One of the lines in the emission spectrum of the hydrogen atom has a wavelength of 656.7 nm, how would you Identify the value of n initial for the transition giving rise to this emission?
-
What is the vertex form of y=4x^2-x+4?
-
What is the pH of a 0.0067 M KOH solution?
-
What is the equation to find pH and pOH?
-
What is the lewis structure of NO^+?
-
The mass defect for a Li-6 nucleus is -0.03434 g/mol. How do you calculate the atomic mass of Li-6?
-
What is the standard cell notation of a galvanic cell made with silver and nickel?
-
What is a property of all alkanes?
-
How many grams of K_2CO_3 are needed in order to produce 2.0 mol K_2O?
-
What is half chair conformation?
-
What is the "pH" for 2.5 xx 10^(-6) "M" "HCl"?
-
How do London dispersion forces increase?
-
How do you find vapor pressure?
-
What is the half-life of 20 g of a radioactive sample if 5 g remain after 8 minutes?
-
A 100.0 mL sample of .10 M NH_ is titrated with .10 M HNO_3. What is the pH of the solution after the addition of 150.0 mL of HNO_3?
-
How do you write f(x)=-x^2+4x+6 in vertes form?
-
What kind of reaction is 2Fe(s) + O_2(g) -> 2FeO(s)?
-
What is the vertex of the parabola y=(x-8)^2?
-
Question #e901d
-
What is the Lewis structure of BF_4^-?
-
How do you rationalize the denominator and simplify (1+sqrt2)/(3-5sqrt2)?
-
How do alkoxide ions form?
-
How do you solve x + 3y = 6 and 2 x + y = 4 using substitution?
-
How do you write the point-slope form of the equation below that represents the line that passes through the points (−3, 2) and (2, 1)?
-
How do you find the midpoint of the line segment joining (2, -3) and (5, -4)?
-
What is the the vertex of y =-x^2 - 4x - 10?
-
How do you graph y = x + 2 by plotting points?
-
What is a secondary alcohol?
-
How do you write an equation of a line going through (1,2) (-1,2)?
-
What is the pH of a 0.85 M NH_4Cl solution?
-
Question #9abd1
-
How do you write a quadratic equation with Vertex: (-1,-3) x-intercept: 2?
-
If the mole fraction of NaCl in an aqueous solution is 0.0927, what is the percent by mass of NaCl?
-
Sodium-24 has a half-life of 15.0 hours. Suppose you had a sample containing 0.010 moles of Na-24. How many hours would be required to reduce your sample to 6.25 x 10^-4 moles?
-
What frequency does a photon of wavelength 4.5 * 10^-4 m have?
-
What is the standard form of the equation of the parabola with a directrix at x=5 and a focus at (11,-7)?
-
In 5.49 seconds, 1.20 g of argon-35 decays to leave only .15 g. What is the half life of argon-35?
-
How do you graph Y=(x-4)^2?
-
The product of two consecutive even integers is 168. How do you find the integers?
-
How do you name meso compounds?
-
Question #269de
-
How do you do addition reactions of alkenes?
-
How do you name cycloalkanes with halogens?
-
What is the number of moles in 9.63 L of H_2S gas at STP?
-
How are aldehydes different from ketones?
-
Question #7ee1d
-
If the density of an unknown gas Z 4.50 g/L at STP, what is the molar mass of gas Z?
-
Question #3f2c0
-
What is the molecular shape of acetylene?
-
What is the pH and pOH of a 1.5 * 10^-3 M solution of sulfuric acid (H_2SO_4)?
-
What is the effect of changing y = 3x-2 to the equation y = 3x+ 2?
-
How many valence electrons does NO_3^- have?
-
How do you rationalize the denominator and simplify sqrt18/sqrt3?
-
You have a compound that is composed of 62.0 grams C, 12.15 grams H, 13.771 grams O and 12.059 grams N. What is its empirical formula?
-
What is the Henderson-Hasselbalch equation? How is it used in chemistry?
-
The pH of a solution is 5.6. What are the hydrogen and hydroxide concentrations?
-
What is the value of cos (pi/3) - sin((3pi)/2)?
-
Next