Questions asked by Room 204

Back to user's profile
What is the difference between ethene , ethyne, ethylene and acetylene??? Thanks!
How would you write the equilibrium constant expression for the following $H_{2} O_{(g)}$ $H_2O_((g))$ $⇌$ $rightleftharpoons$ $H_{2}$ $H_2$ $(g)$ $(g)$ $+$ $+$ $\frac{1}{2}$ $1/2$ $O_{2}$ $O_2$ $(g)$ $(g)$ ?
Why are concave mirrors are suitable for make up?
Why is alcohol a good antiseptic at the cellular level?
How to prove that $sin (\frac{π}{2} - θ)$ $sin (pi/2 - theta)$ = $cos θ$ $cos theta$ ?
In a large ripple tank, a wave producing machine working at a frequency of 30 Hz produces 25 complete waves in a distance of 0.5 m. What would be the velocity of an individual wave? Thanks!
Do all non-conductors of heat have a specific heat of zero?
What is the immediate physiological effect of tobacco smoke on the lungs?
What is the conventional ion notation? For example, how which of the following is correct?
Solve the following by using the quadratic formula?
How do I solve this exponential equation?
If a sample contains $1.228 \cdot 10^{23}$ $1.228*10^23$ molecules of $H_{2} {SO}_{4}$ $"H"_2"SO"_4$ then what is the mass of an individual $H^{+}$ $"H"^(+)$ and ${SO}_{4}^{2 -}$ $"SO"_4^(2-)$ ion?
What is the angle between two forces of equal magnitude, $F_{a}$ $F_a$ and $F_{b}$ $F_b$ , when the magnitude of their resultant is also equal to the magnitude of either of these forces?
If a stone is dropped at an altitude of 174.9 m from a helicopter which is ascending with a velocity of 20.68 m/s, how long does the stone take to reach the ground?
How do I prove and find the domain of the following trig identity?
Using an ICE Table, how do we calculate $K_{c}$ $K_c$ for the following reaction?
What is the value of $(A$ $(A$ x $B)^{2}$ $B)^2$ + ${(A \cdot B)}^{2}$ $(A * B)^2$ ?
A rectangular tank is filled to the brim with water. When a hole at its bottom is unplugged, the tank is emptied in time T. How long will it take to empty the tank if it is half filled?
Does the electrolyte in a lead acid battery bubble and then evaporate due to the the heat change associated with the electrochemical reactions in the battery or is it something else?
What are carbonate ions and how can you recognize them?
What are carbonates and bicarbonates and why aren't they studied in organic chemistry?
How does a step-up transformer, like the one used in a a battery-powered standby electrical system, not violate the Law of Conservation of energy when it changes 12V from a DC source to 110V of AC supply?
How does yougurt turn sour when you put a metal spoon in it for too long?
Why do cis isomers have higher melting points than trans isomers even though trans isomers are more stable?
How do we find the range of the binary relation $4 x^{2} + 9 y^{2} = 36$ $4x^2 + 9y^2 = 36$ ?
How is $f'(x)=-x/sqrt(a^2-x^2$ when $f(x)=a-sqrt(a^2-x^2$ using the power rule ?
Which sentence is grammatically correct? a) I buy gifts for my relatives **on** Christmas. b) I buy gifts for my relatives **at** Christmas.
Should'nt the optimum pH of pancreatic amylase differ from that of salivary amylase?
A cat sitting on top a train travelling north to south at a speed of $"70mph"$ observes snow falling vertically downwards. In what direction will it be snowing for a dog sitting next to the train tracks?
Of 10 senior citizens surveyed, 60% like chocolate icecream and 70% like strawberry icecream. What percentage of people like both chocolate and strawberry?
If two waves, each of amplitude $z$ , produce a resultant wave of amplitude $z$ , then what is the phase difference between them? Is there a specific equation or formula I can use?
At which depth will the glass, which is it not a right cylinder, be volumetrically half-filled? Assume that the thickness of the base is negligible and the thickness of the walls is constant.
How would you find the period of $sin^2theta$ ?