Which of the following scientists did not contribute to the cell theory? A. Virchow B. Hooke. C. Schleiden D. Newton

Aluminum metal reacts with chlorine producing a spectacular display of sparks: 2al (s) + 3 cl2 (g) à 2alcl3 (s) δho = - 1408.4 kj how much heat is released when 7.5 g of metal react with excess chlorine

Water vapor is converted from a gas into a liquid during which process in the water cycle

A strong electrolyte always contains a metal combined with a nonmetal can conduct electric current is always a strong acid. partially dissociates in aqueous solution is always a covalent compound

Which of the following gases would diffuse the fastest? CH4 CCl4 O2 H2

If the half-life of technitium-104 is 18.0 min, how much of a 14.2-g sample will remain after 72 minutes? 3.55g 1.78g 0.888g 0.444g

The definition of volume is? a) width*height b) the space occupied by mass c) the space occupied by a liquid d) the mass of liquid required to fill a container

What is the empirical formula of a substance that is 53.5% C, 15.5% H, 31.1% N?

What is the lowest layer of the atmosphere and what is its highest altitude?

An atom that has 84 protons and 86 neutrons undergoes a reaction. At the end of the reaction, it has 82 protons and 84 neutrons. What happened to the atom?

A compound of material formed by a chemical is known as?