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do you like chemistry club?
yes
Which metal is liquid at room temperature?
When a solid goes from solid to gas, without entering the liquid phase, what is it called?
Sublimation
If you dissolve lead (II) nitrate and potassium iodide in water, they will react to form Lead(II) iodide and potassium nitrate.
Write the equation for this reaction and balance it.
Pb(NO3)2(aq) + 2KI(aq) --> PbI2(s) + 2KNO3(aq)
if 5.00 grams of propane burn completely, what volume of carbon dioxide is produced at STP?
7.62L CO2
True or False - chemistry comes from the French word "chemise"
False lmaoo "chemise" means shirt in French and the word "chemistry" comes from "Alchemy"
What is denser, water or ice?
Can water, ice and steam exist at the same temperature?
Yes, it's called the triple point
Draw Lewis structure for nitrogen dioxide
will show picture
what is the pH of a 0.02M ammonia solution if its Kb value is 1.8*10^-5
10.8
True or False - sterling silver is pure silver
False; it contains 7.5% copper
What color is liquid oxygen?
Blue
Who discovered the periodic table?
Mendelev in 1869 ;)
Which of the following species is not planar?
carbonate
nitrate
Chlorine trifluoride
Boron trifluoride
Phosphorus trichloride
Phosphorus trichloride
Explain the emission spectrum of hydrogen. Why can it only emit certain colors or wavelengths of light?
Electron energy levels are quantized, meaning hydrogen can only emit certain colors or wavelengths of light. This is because the quantized atomic orbitals can only absorb photons with specific energy values unique to hydrogen.
What is the only letter that doesn't appear in the periodic table?
The letter J :( ... so lonely </3
Which season is the Eiffel Tower's height the tallest? Give explanation.
Summer since metal expands when it's heated, so it becomes a little taller during the hot seasons.
how come some insects can live on top of water surface (explain using chemistry)
surface tension, cohesion/adhesion
If 50.0g of benzene, C6H6 at 25celsius absorbs 2.71kJ of energy in the form of heat, what is the final temperature of the benzene? The specific heat of benzene is 1.72J/g*c
56.50Celsius
q=mass*c*deltaT
The rate constant of a first-order decomposition reaction is 0.0147s^-1. if the initial concentration of reactant is 0.178M what is the concentration of the reactant after 30.0 seconds.
0.115M
If you took all the carbon out of a human body, how many graphite pencils could you make?
About 9,000 :O
What is the most common state of all matter in the universe?
Plasma. Basically it's a soup of gases that have been stripped of some of their electrons, at extreme temperatures. It's the most abundant because stars are mostly plasma!! :O
How come the pH of water decreases as its temperature increases, despite being considered "neutral"
The pH measures hydronium concentration. As temperature is increased, more hydronium is produced therefore pH decreases, however water remains neutral because equal amounts of hydroxide are produced.
An electron in a molecule travels at the speed of 40m/s. The uncertainty of momentum is 1x10^-6 of its momentum. What is its uncertainty in position?
3.643*10^-35 kg(m/s)
Draw the hybridization structure of C2H2
(will draw picture)