How to find the mass of 12dm³ of hydrogen, H2

What would the expected temperature change be (in Fahrenheit) if a 0.5 gram sample of water released 50.1 J of heat energy? The specific heat of liquid water is 4.184 J/g-C

From the unbalanced equations below, identify the one that does not represent a redox reaction. a. h2co3 (aq) → co2 (g) + h2o (l) b. c (s) + h2o (g) → co (g) + h2 (g) c. s2o32 - (aq) + i2 (s) → s4o62 + (aq) + i - (aq) d.

Stacy reads that a 50:50 mixture of methanol and water is best for keeping a car's radiator from freezing when the temperature goes down to - 40°C. Design an experiment to test this finding.

When electricity is produced from coal, the chemical energy in coal is first changed to thermal energy. True or False (i need this answer like now cuz i have to have this test done by 5:00 and its 8:30 -.-)

A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is A) lighter than helium. B) heavier than helium. C) the same weight as helium.

Which of these molecules is least likely to form a hydrogen bond with a water molecule

George is writing an essay about the role of observation and inference in the development of the atomic theory. He wants to explain why it was more difficult to observe the presence of neutrons in atoms.

Which pair of statements below is correct? Multiple Choice An octet is formed via ionic bonding when one or more valence electrons are transferred from one atom to another.

If wave A has a frequency of 4.60 x 10^14 s-1, what is the wavelength in nanometers (show your work) ?

What is the mass in grams of 85.32 mL of blood plasma with a density of 1.03 g/mL?