Unit 5 Test 6 of 35
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A student is doing an experiment to study the rate of reaction between vinegar and Alka-Seltzer. The experiment is done in a film canister. The
reaction produces CO2 gas, which builds up pressure inside the canister and eventually pops the top off. The time it takes to pop the top is what is
used to evaluate the rate of the reaction. In Trial 1, she uses a 1.0 g chunk of an Alka-Seltzer tablet in 10.0 ml of a 0.5 M vinegar solution at 20°C.
The top popped off in 8.34 seconds.
Give a method, other than changing the temperature, to increase the rate of this reaction.
In terms of collision theory, explain why the method chosen causes an increased rate.
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Which metal exist in liquid state and can be cut with knife ?

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m