Which of these pieces of apparatus has the lowest percentage uncertainty in the measurement shown?
Volume of 25 cm^3 measured with a burette with an uncertainty of +-0.1cm^3
Volume of 25cm^3 measured with a measuring cylinder with an uncertainty of +-0.5cm^3
Mass of 0.150g measured with a balance with an uncertainty of +-0.001g
Temperature change of 23.2 degrees C measured with a thermometer with an uncertainty of +-0.1 degrees C
A student is provided with a 5.00 cm^3 sample of 1.00 x 10^-2 mol dm^-3 hydrochloric acid. The student is asked to devise a method to prepare a hydrochloric acid solution with a concentration of 5.00 x 10^-4 mol dm^-3 by diluting the sample with water.
Which of these is the correct volume of water that should be added?
Which of these species has a trigonal planar structure?