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- 2. Was there any physical change in the characteristics of trichloroethane when it was added to water?1.Why is tap water a homogenous mixture, whereas distilled water is a pure substance? Explain. 2.Why does the lit splint extinguish when it approaches a beaker filled with dry ice. Hint: What two ingredients are needed to sustain a fire? ExplainWhy is tap water a homogenous mixture, whereas distilled water is a pure substance?
- As the temperature increases, which state of matter are the molecules in?Before slow cooking a meat (for example, in a crockpot/slow-cooker) you will often find instructions to sear the meat on high heat in an oiled skillet for a few minutes before transferring it to the crockpot. The searing is brief – not long enough to cook the meat thoroughly. Despite myth/legend, the searing will not “seal in the juices”. What is the searing for?Question 19 What will happen to the rate of a first order reaction if the reactant concentration is doubled? O The rate of reaction will double. O The rate of reaction will not change. O The rate of reaction will quadruple. The rate of reaction will be zero.
- Explain the statement, “Oil and water don’t mix.”What category of environmental chemistry that deals with chemical phenomena in all types ofwater and natural waters?Q1/Why do we use oil instead of water to determine the melting point of chemicals? Q2/What is the reason for the variation in the measured melting point of the same chemical? Q3/What is the best type of oil used to measure the melting point of chemicals? Why?