1) Which of the following is the best example of a physical change?

A) Sugar Dissolving in tea

B) Firefly Glowing

2) In the combustion of ethane, what is/are the reactants?

C2H6 + O2 = => CO2 + H2O

A) C2H6 and O2

B) CO2 and C2H6

What is density of a mineral?

Three 1.0-l flasks, maintained at 308 k, are connected to each other with stopcocks. initially the stopcocks are closed. one of the flasks contains 1.5 atm of n2, the second 2.2 g of h2o, and the third, 0.30 g of ethanol, c2h6o.

What element is a byproduct of nuclear fusion?

If hydrogen composes 11% of a 100 gram sample of water, what is the mass of the hydrogen in the sample?

Select all of the statements that are true. Electrons are located in shells or orbits around the atom. Electrons orbit slowly around the atom. Electrons travel in one flat path around the nucleus of an atom.

What are the characteristics of bones?

If 294 grams of FeS2 is allowed ti react with 176 grams of O2 according to the following equation how many grams of Fe2O3 are produced? FeS2 + O2 = Fe2O3 + SO2

Convert 3.57 moles of aluminum to grams

An average microwave uses a frequency of 2.54 GHz. How much energy is emitted?

Why scientist form a hypothesis