Is all air pollution caused by humans

What is the source of energy for an earthquake? A. heat from the asthenosphere B. the earth's magnetic field C. the building of volcanoes D. motion of tectonic plates

Which scientist invented a model of the atom that most closely resembles the modern electron cloud model? j. j. Thomson Niels Bohr Ernest Rutherford John Dlaton

A redox reaction is set up so that both half reactions take place in separate beakers that are connected by a salt bridge and a wire. A path for the transfer of ions is provided by the? (1) anode (2) cathode (3) salt bridge (4) wire

Hot coffee in a mug cools over time and mug warms up. Which describes the energy In this system

A substance that is made up of more than one kind of molecule is called a

When K-37 undergoes positron emission, what is the resulting atom? A) K-37 B) K-38 C) Ar-37 D) Ar-38

Consider the following reaction where Kp = 4.55*10-5 at 723 K: N2 (g) + 3H2 (g) ⇋ 2NH3 (g) a) If the three gases are mixed in a rigid container at 723 K so that the partial pressure of each gas is initially one atm, what will happen?

Which terms are used to identify pure substances? (1) an element and a mixture (2) an element and a compound (3) a solution and a mixture (4) a solution and a compound

Which of the following polyatomic ions will form an ionic compound with two sodium ions? CO32- HCO31- NO21- NO31-

What is hybridisation