All the following conditions must be present for a fire to start except A. nitrogen to support the fire. B. a heat source (such as a spark). C. fuel (such as wood or gasoline). D. oxygen to support the fire.

The following is NOT part of our bodies defense mechanism for infectious disease: A. mucous membranes B. red blood cells C. white blood cells D. antibodies

How many moles of water are produced when 3.45 moles of KMnO4 react? Give your answer to the nearest 0.1 moles. moles H2O

The nucleus of an isotope of sulfur contains 34 neutrons. what is the atomic number of this isotope?

A 186 mL sample of a 0.275 M solution is left on a hot plate overnight. The following morning, the solution is 1.10 M. What volume of solvent has evaporated from the 0.275 M solution?

How many joules of energy are necessary to heat a sample of water with a mass of 46.0 grams from 0.0 to 100.0

What is milk best described as? solution, suspension, compound, or colloid?

In any chemical reaction, the quantities that are conserved are ... A. mass and moles. B. the number of molecules and the volumes. C. the number of moles and the volumes. D. mass and number of atoms.

How many neutrons does element X have if its atomic number is 39 and its mass number is 75?

Enter a chemical equation for LiOH (aq) LiOH (aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation.

Percent copper in brass lab