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If H2 gas in the sample has a speed of 1.92 x 103 m/sec, what is the speed of the H2O vapor?
Part A: A hydrochloric acid solution has a pH of 2.8. Calculate the concentration of hydronium and hydroxide ions in the solution.
Part B: A sodium hydroxide solution has a concentration of 7.1 x 10^3. Calculate the pH of the solution.
Part C: The hydrochloric acid and sodium hydroxide react together in neutralization reaction. Write the balanced chemical equation for the reaction. Label the acid, base, and salt.
In recent years engineers have been working on an aluminum-air battery as an alternative energy source for electric vehicles. The battery consists of an aluminum anode, which is oxidized to solid aluminum hydroxide, immersed in an electrolyte of aqueous KOH. At the cathode oxygen from the air is reduced to hydroxide ions on an inert metal surface. Write the two half-reactions for the battery. Please include all states of matter.
is the amount of energy that it takes to raise the temperature of 1 gram of a
substance by 1 degree Celsius
131-Iodine has a half life of 8.1 days. How much of a 1800 gram sample remains after 20 days?
What mass of silver nitrate AgNo3, is needed to make 0.50L of a 0.10mol/L solution?
good day
My question is:
In a comparison of two methods for the determination of chromium in rye grass, the following results (mg/kg Cr) were obtained: Method 1: mean = 1.48; standard deviation = 0.28 Method 2: mean = 2.33; standard deviation = 0.31
For each method five determinations were made. Do the two methods give results having means which differ significantly?
Please assist
Good day.
My question is as follows:
It is suspected that an acid-base titration method has a significant indicator error and thus tends to give results with a positive systematic error, i.e. a positive bias. To test this an exactly 0.1 M solution of HCl is used to titrate 20.00 mL of an exactly 0.1 M solution of NaOH and the following results were obtained 20.06, 20.18, 19.87, 20.51, 20.34, 20.41.
Test for positive bias in these results at 95% confidence level.
Please assist.
Calculate the moles of potassium sulfide formed when 5.4 g of potassium gas reacts with excess sulfur.
2 K+S > K2S
How many grams is 5.97E24 molecules of C6H12O6 gas at STP?
