10 most difficult chemistry riddlesChemistry quiz
Which has more calories: table sugar or aspartame?
pretty much the same
table sugar has much more calories
aspartame has much more calories
aspartame has no calories at all
Aspartame produces 4 kilocalories of energy per gram when metabolized, sucrose (table sugar) produces 3.9 kilocalories. However, aspartame is approximately 200 times sweeter than sucrose, so it is consumed in much smaller doses.
What does synthesis gas (water gas) consist of?
oxygen (O2) and hydrogen (H2)
methane (CH4) and water (H2O)
carbon dioxide (CO2) and hydrogen (H2)
carbon monoxide (CO) and hydrogen (H2)
Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The water-gas shift reaction can be used to reduce the carbon monoxide while producing additional hydrogen, resulting in water gas.
Cranberry glass is made by adding ..?
Cranberry glass or 'Gold Ruby' glass is a red glass made by adding gold salts or colloidal gold to molten glass. The glass is typically hand blown or molded. Legend holds that cranberry glass was first discovered when a noble tossed a gold coin into a mixture of molten glass
What is exactly the pH value of distilled water?
It depends on the temperature
Pure water is about 7 at 25 °C; this value decreases with increasing temperatures. At 50 °C, it is 6.55. It is also worth to note, that water that has been exposed to air is mildly acidic, because it absorbs carbon dioxide from the air.
Mickey is a "dangerous" alcoholic drink. What did he contain?
In slang, a Mickey Finn (or simply a Mickey) is a drink laced with a psychoactive drug or incapacitating agent (especially chloral hydrate) given to someone without their knowledge, with intent to incapacitate them. Serving someone a "Mickey" is most commonly referred to as slipping someone a mickey.
Why is White Sands Desert in New Mexico so purely white?
it is gypsum
it is very fine grained sand
it iswhite quartz
it is an optical illusion
White Sands, having 442 total square kilometers of dune fields, is the world's largest surface deposit of gypsum. Unlike other desert sands, it is cool to the touch, due to the high rate of evaporation of surface moisture and the fact that the sands reflect, rather than absorb, the sun's rays.
Who carried out the first nuclear fission reaction in 1938?
Nuclear fission of heavy elements was discovered on December 17, 1938 by German Otto Hahn and his assistant Fritz Strassmann, and explained theoretically in January 1939 by Lise Meitner and her nephew Otto Robert Frisch
What kind of fire do we mean with the letter D?
The Class D fire use combustible metal as its fuel source. Examples of such combustible metals include titanium, magnesium, aluminum, and potassium. To extinguish a Class D fire, use a dry powder agent. This absorbs the heat that fire requires to burn and smothers it as well.
Methanol (wood alcohol) is highly poisonous. Comparing to ethanol, is it more or less sedative?
that depends on the temperature
Methanol has a much weaker sedative effect than ethanol, which leads the victim to drink more than it would normally do with ethanol. Methanol is oxidized to formaldehyde and then to the poisonous formic acid in the liver.