If a lightbulb is burnt out does it still consume electricity when you turn the light switch on?
I agree with Marcos in the case of old incandescent lights, however, its worth noting that if you are using fluorescent tubes in a multi lamp fitting i.e. commercial environment the control gear consumes (approx. 12%) electricity independent of the tubes. So you could still consume when a lamp has gone.
Le chatelier's principle?
a. If more reactant is added, the equation will shift to the right in order to make more product (which will increase the products) b. If the temperature is decreased, the reaction will shift to the right to create more heat if it is exothermic (which will increase the product), and to the left if it is endothermic (which will decrease the products) c. If the pressure is decreased, it will shift in the direction where there are more moles of gas present, because it can now take up more space. If the products have more moles of gas, the products will increase, and vise versa.
Can a gas diffuse in a gas?how about a gas in a liquid?give example?
diffusion is the movement of paricle from a region of higher conc. to a region of lower conc. therefore a gas can diffuse in a gas if either one is conc. in one point and the same goes for gas in liquid example: u can smell the fart of someone else even though he's sitting at the other end. that's because his fart diffused into the air you breathe in.
Will exhaust leaks at manifold gaskets cause the engine to misfire?
I'm going to address the issue that has so far been overlooked. Most gasoline passenger and light duty trucks on the road today utilize electronically controlled fuel injection. Exhaust manifold leaks have the effect of “fooling” the oxygen sensor. Exhaust gas travels in pulses with high and low pressure zones. Exhaust gas leaks out during the high pressure event. Outside air is drawn INTO the leaking area during the low pressure event. The result is an oxygen sensor that reports a lean condition. (Too much air in relation to fuel). The Powertrain Control Module (PCM) will then increase fuel delivery to compensate. With a leak of sufficient magnitude, the PCM can end up substantially increasing fuel delivery in an attempt to “correct” the perceived lean condition. The engine (or that half of the engine) actually ends up running quite over- rich (Too much fuel in relation to air). Spark plug fouling can result, which in turn may lead to a MISFIRE. If this situation occurred on , for instance, a 98 Ford F150 with a V8, the following may be present. Lean exhaust code and misfire codes set on the bank with the exhaust leak present. The exhaust leak did not cause an immediate misfire. But it is the root cause of the resulting mayhem.
Why is the Periodic Table arranged by atomic number and not atomic mass?
Atomic number is the number of protons in the nucleus of each element's atoms. That number is unique to each element. Atomic mass is determined by the number of protons and neutrons combined. An electron's mass is 1/1840th of a proton's, so to all intents and purposes it has a minimal effect on atomic mass. The number of neutrons can vary, creating two or more isotopes of the same element. Carbon, for example has an atomic number of 6. That means it has 6 protons. But it has two isotopes, Carbon-12 with 6 protons and 6 neutrons, and Carbon-14 with 6 protons and 8 neutrons. Dmitri Mendeleev, who first came up with the idea of a periodic table in 1871 to group the behaviour of elements, was a keen player of patience, the solitaire playing card game. Think of him laying out the elements like playing cards and looking for patterns, so predictions about newly discovered elements could be made.He actually started out with atomic weights and the table worked, but there were some anomalies. It was the English physicist Henry Moseley in 1913 who proposed that using atomic number was a much more reliable way of arranging the table. To be fair to Mendeleev our understanding of the basic structure of the atom wasn't understood until Ernest Rutherford came up with the model in 1911. Poor Henry Moseley was killed at Gallipoli in 1915. Just think what other insights he might have had should he have lived.