There will have some error. 2) A volatile liquid was allowed to evaporate in a 43.298 g flask that has a total volume of 252 ml. the temperature of the water bath was 100˚C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vapor was 44.173 g. calculate the molar mass of the liquid. T = 273 + 100 = 373 V = 252 mL = 1 L / 1000 mL = 0.252 L P = 776 Torr R= 0.0821 mass of 44.173 - 43.298 g = 0.875g moles of gas = PV / RT = 776 x .252 / 62.363 x (273+100) =0.00841 moles molar mass = 0.875g / 0.00841 moles = 104.1 g/
To observe the change in properties of various synthesized copper compounds in order to identify the reactions and products being formed. Secondly, to become familiar with methods of separating compounds through decanting, heating with Bunsen burner and suction filtration system. In doing so, be able to recover copper metal and interpret the resulting percentage yield by applying the law of conservation of matter. Upon combining 20.0mL of NaOH to 10.0mL of Cu(NO3)2 and stirring the solution, there was a darkening of the initial blue color. Adding distilled water to the solution lowers the initial intensity of the blue color, bringing back to a lighter blue.
a. Pyrite hypothesis accept/reject = I accept my hypothesis because after the pyrite was introduced to the water the level of ph dropped to 4 making the water more acidic. b. Coal hypothesis accept/reject = I reject my hypothesis because the ph level rose slightly making it less acidic after the coal was introduced to the water sample. 3. Based on your data, what effect do you predict coal mining has on the environment?
7. How did Fahrenheit make thermometers smaller? Used mercury 9. What strange twist did Anders Celcius incorporate into his thermometers? He placed the his temperature scale at o degree for the boiling point, and ent downward and placed the freezing point at 100 degrees 10.
Marshmallows and Balloons Reveal a Change in Volume Due to Increasing and Decreasing Pressures Chemistry Period 1 20 February 2013 Chemistry- Per.1 20 February 2013 Marshmallows and Balloons Reveal a Change in Volume Due to Increasing and Decreasing Pressures INTRODUCTION Pressure can define the amount of volume in an object depending on how much is used, hence Boyle’s Law. Some scientists have tried to understand the different ways that gases work. Boyle is one of the scientists that experimented with gases; he states that whenever the pressure of a gas increases, the volume of the gas will decrease, and vise versa. Demonstrated in Mr. Squiddy’s demo, when the bottle was squeezed he would float down and when it was released he would float back up. Some might think that by squeezing the bottle, Mr. Squiddy would go up with the water however, he would go down due to the pipette being used.
If the temperature was less than the water bath in some places because only part of the pipet was immersed in the boiling water, the molar mass calculated would become lower. This is because the ideal gas law temperature value would be too low, therefore lowering the overall
Once the zinc was added slowly to the solution, a gas was released and the solution began to change colors. The colors that occurred were light blue to light grey, to a clear blue, back to a dark blue, then grey color. Once the stirring process ended, the solution was slightly blue and not colorless. There were solids in the bottom. The reaction that occurred with this step was displacement and metathesis in the form of gas formation.
The water that I placed activated carbon in actually increased by 2pH rather than decreasing. 3. Based on your data, what effect do you predict coal mining has on the environment? Answer = Coal mining is the removal of coal from the earth which slows the Earth's capability to decrease the acidity of groundwater. If an ideal pH level is 7 than the carbon was able to take our acidic water and make it more neutral.
As well as when NaOH is in a solution form it absorbs carbon dioxide from the air which is weakly acidic. When the two mix, it partially neutralizes the solution. So the mass you take one day, will not be the same the next day. Lab 2: Standardizing NaOH Figure 1. This table shows the data collected while standardizing NaOH.
A) is neutralized by water B) is surrounded by water molecules C) reacts and forms a covalent bond to water D) aggregates with other molecules or ions to form a micelle in water Answer: B Page Ref: Section 3 11 9) Which would you expect to be most soluble in water? A) I B) II C) III D) IV Answer: A Page Ref: Section 3 10) Solutes diffuse more slowly in cytoplasm than in water because of A) the higher viscosity of water. B) the higher heat of vaporization of water. C) the presence of many crowded molecules in the cytoplasm. D) the absence of charged molecules inside cells.