Which changes are evidence of a chemical reaction? a beaker of water becomes hot to the touch upon?

Liquid hexane (CH3 (CH2) 4CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). What is the theoretical yield of water formed from the reaction of 62.9 g of hexane and 158.

If a reaction occurs when a piece of metal is placed in a solution, what can you conclude about the solution? A.) It is probably basic because metals rarely react with acids. B.) It is basic because acids do not react with metals. C.

If an atom of sodium had an atomic number of 11, and lost and electron, what would you have?

Determine the percent ionization of a 0.215 m solution of benzoic acid.

How many objects in the solar system have been confirmed to currently support life? A. three B. one C. four D. two

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin