What are physical changes

Which of the following is most likely true about water in chemical systems? A) Water dissolves nonpolar ionic compounds. B) Water dissociates ionic compounds. C) Water dissociates covalent molecules. D) Water dissolves nonpolar covalent substances.

Is a corroding metal a chemical and physical change

A sample of propane (C3H8) is placed in a closed vessel together with an amount of O2 that is 3 times the amount needed to completely oxidize the propane to CO2 and H2O at constant temperature.

What is one way in which chemistry affects your everyday life? A. Refrigerators use energy more efficiently than they did 10 years ago. B. Tap water is safe to drink because it is monitored for harmful substances. c.

What is the pH of a solution with a concentration of 3.6 * 10-5 molar H3O+? Show, or explain, the work used to solve this problem.

According to the octet rule most elements need_valence electrons.

What is the average speed of particle in a gas at room temperature? Why is temperature an important variable?

An electron is in a region outside the nucleus. An electron a) Is larger than a proton and has no charge b) Has less mass than a proton and has a negative charge c) Is smaller than a proton and has no charge d) Has a positive charge

Under conditions of "feasting", the body favors oxidation/utilization of which source for energy production

2.17 in to 10^23 molecules of Br 2 to moles