Which of the following is a source of chemical energy commonly used by humans? A. water flowing in a river B. a bicycle C. a sandwich D. turning on a lightswitch

Which of the following statements is true about the atoms of any element: a. They have the same number of protons as the atoms of all other elements. b. They have protons that are identical to the protons of all other elements. c.

A balloon filled with 1.22 l of gas at 286 k is heated until the volume is 2.86 L while the pressure remains constant. What is the temperature of gas in Kelvin. Round to nearest whole number

What type of reaction is C 12 H 22 O 11> 12C+11H2O

If a gaseous mixture is made by combining 1.55 g Ar and 1.80 g Kr in an evacuated 2.50 L container at 25.0 ∘ C, what are the partial pressures of each gas, P Ar and P Kr, and what is the total pressure, P total, exerted by the gaseous mixture

Two charged balloons 2.1 * 10-1 meters apart have a repulsive force of 1.3 * 10-1 newtons. The charge on one balloon is 8.2 * 10-7 coulombs. What is the charge on the other balloon? (k = 9.0 * 109 newton·meters2/coulomb2) 7.7 * 10-7 coulombs 8.

How can a neutral atom become a positively-charged particle?

The last column of the periodic table contains the noble gases, elements that do not easily form chemical bonds.

When pollution is removed from the air by a natural process, it

What atomic property is different in each isotope of an element?

How do carbon-12 and carbon-13 differ? Select all that apply. They have different amounts of neutrons. They have different atomic charges. They have different mass numbers. They have different amounts of electrons.