Zn(s) + O (g) ZnO(s) + 350.5kJ
calculate the standard enthalpy of reaction when 25.0g of zinc oxide is produced.
Posted 7 years ago by gurleenm in Chemistry 30 | 3 answers
#thermochemistry
Police can estimate the speed a car had been travelling using the length of the skid marks. One formula used for this purpose is v=-7+8.2 $\sqrt{d}$√ d , where v is the speed, in kilometres per hour, and d is the length of the skid marks, in metres.
c.) What would have been the speed of a car, to the nearest kilometre per hour, that would have resulted in 150m skid marks?
Posted 7 years ago by danikam in Math 20-1 | 4 answers
#radicals
A student set up an electrolytic cell similar to the one in the Electrolysis experiment to collect hydrogen gas over water in a burette, using a small strip of lead metal as the anode (instead of copper). Before the electrolysis, the mass of the lead strip was 8.218 g. A current of 121.1 mA was applied for a period of 3600 seconds, during which time some of the lead metal was oxidized to lead (2+). What was the mass of the lead metal strip at the end of the electrolysis?
Final mass of lead strip = ? g
(calculate your answer in grams, but do not include the units when submitting your response)
Posted 7 years ago by spongebob in Chemistry 30 | 0 answers
#chemistry 30
A student set up an electrolytic cell similar to the one in the Electrolysis experiment to collect hydrogen gas over water in a burette, using a small strip of lead metal as the anode (instead of copper). Before the electrolysis, the mass of the lead strip was 9.333 g. A current of 121.1 mA was applied for a period of 3600 seconds, during which time some of the lead metal was oxidized to lead (2+). What was the mass of the lead metal strip at the end of the electrolysis?
Final mass of lead strip = ? g
(calculate your answer in grams, but do not include the units when submitting your response)
Posted 7 years ago by in Chemistry 30 | 2 answers
#chemistry 30
tips on how to write a source analysis
Posted 7 years ago by Maggiegd55 in Social Studies 20-1 | 1 answers
#nationalism
Solve the equation , $\sqrt{2x-5}$√2x−5 - 4 = -x, Show all work, and verify the solution(s).
Posted 7 years ago by danikam in Math 20-1 | 3 answers
#radicals
The speed of a tidal wave produced by a tsunami is determined by the formula s= 356 $\sqrt{d}$√d , where S is the speed of the wave in km/h, and d is the depth of the ocean in km. If the speed of a wave is determined to be 150 km/h, what is the depth of the ocean at that point? Show all work, and round to the nearest hundredth of a kilometre
Posted 7 years ago by danikam in Math 20-1 | 2 answers
#radicals
some steps involved in the process of in vitro fertlizaton
1. eggs are removed from ovary
2. fsh is adminstered to egg donor
3. fertilization occurs in a artifical medium
4. ultasound is used to monitor the development of follicles.
Hi, the correct answer is actually 2413 instead of 2134 according to my teacher
Posted 7 years ago by aliya in Biology 30 | 0 answers
#fertilization
some steps involved in the process of in vitro fertlizaton
1. eggs are removed from ovary
2. fsh is adminstered to egg donor
3. fertilization occurs in a artifical medium
4. ultasound is used to monitir the development of follicles.
is it not 1324?
Posted 7 years ago by aliya in Biology 30 | 1 answers
#fertilization
simplify the expression $3\sqrt{7\div\sqrt{14-4\sqrt{7}}}$3√7÷√14−4√7 by rationalizing th denominator
Posted 7 years ago by danikam in Math 20-1 | 1 answers
#radicals