Chemistry, 14.06.2020 00:57 rachel2005smith
Se desea preparar una solución de hidróxido de sodio (NaOH) al 19 % m/m, cuyo volumen sea de 100 mL (la densidad de la solución es de 1.09 g/mL). ¿Cuántos gramos de agua y de NaOH se deben usar?. (R: 20.7 g de NaOH y 79.3 g de agua).
Answers: 2
Chemistry, 21.06.2019 19:50
Which statement describes how phase changes can be diagrammed as a substance is heated? the phase is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the phase is on the x-axis. the time is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the time is on the x-axis.
Answers: 1
Chemistry, 22.06.2019 12:00
Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.
Answers: 2
Chemistry, 22.06.2019 17:10
)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.
Answers: 1
Chemistry, 23.06.2019 00:10
Apropane torch is lit inside a hot air balloon during preflight preparations to inflate the balloon. which condition of the gas remains constant
Answers: 2
Se desea preparar una solución de hidróxido de sodio (NaOH) al 19 % m/m, cuyo volumen sea de 100 mL...
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