Which of the following choices is the most conclusive in determining whether a chemical reaction has taken place?
a change in color
a change in odor
a gas was formed
a change in the identity of the substance(s)

if different products are not created during a process, then a chemical reaction has not occurred. true or false?

chemical equations provide:
the physical state of each reactant and product.
the ratios of reactants and products.
the chemical identity of the reactants and products.
all of the above information

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Listen base your answer to the question on the information below.propane is a fuel that is sold in rigid, pressurized cylinders. most of the propane in a cylinder is liquid, with gas in the space above the liquid level. when propane is released from the cylinder, the propane leaves the cylinder as a gas. propane gas is used as a fuel by mixing it with oxygen in the air and igniting the mixture, as represented by the balanced equation below.c3h8(g) + 5o2(g) → 3co2(g) + 4h2o() + 2219.2 kja small amount of methanethiol, which has a distinct odor, is added to the propane to consumers detect a propane leak. in methanethiol, the odor is caused by the thiol functional group (–sh). methanethiol, ch3sh, has a structure that is very similar to the structure of methanol.what is the correct structural formula for a molecule of methanethiol