An unknown sample weighing 28.26g contain 70% of hydrogen and 30% of carbon calculate the

[1]empirical formula

[2]the molecular formula

[3]give the iupac name of the compound

When parallel light rays exit a concave lens, the light rays

How do tests with crash dummies, seat belts, and air bags illustrate Newton's first law of motion?

A geochemist in the field takes a small sample of the crystals of mineral compound X from a rock pool lined with more crystals of X. He notes the temperature of the pool, 26.° C, and caps the sample carefully.

2. Iron reacts with superheated steam to form hydrogen gas and the oxide Fe3O4. Calculate the number of moles of hydrogen produced by 10.0 g of iron and enough steam. 3Fe (s) + 4H2O (g) - --> Fe3O4 (s) + 4H2 (g) a. 0.239 mol H2 b. 239 mol H2 c. 2.

Data Record your data either in your lab notebook or in the space below. Time Radioactive Atoms 0.5" Half-Life Minutes Predicted Simulated Cycles, n Acted out 0.0 100 Initial = 0 100 1 100 0.5 1 2. 1.0 1.5 3 2.0 4 2.5 5 3.0 6 3.5 7 4.0 8 id

What is the passing of a wave through an object

Classify the following as atoms or molecules. Drag the appropriate items to their respective bins. a. Mg S b. H2 SO3 c. HBr

If a sample of gas has a volume of 5.00 L @ 92.3 C, what will the volume of the gas be if the temperature is lowered to - 37 C

On melting of ice, there is a decrease in volume instead of increase. Why?

When a dolphin jumps, it moves its muscles and chemical potential energy is converted to kinetic energy. Some of this energy is lost to the dolphin. Explain why this phenomenon does not violate the Law of Conservation of Energy.