Which of the following is a physical change?

explosion

rotting of food

evaporation

rusting of iron

11. If the pH of a solution increases from 2.0 to 4.0, the H3O^ + ion concentration O a decreases by a factor of 2. b. decreases by a factor of 100. c. increases by a factor of 3. O d. increases by a factor of 1000,

A scientists compares two samples of white powder

How can an unsaturated solution of a solid be made saturated? a. increasing the temperature of the solvent b. decreasing the temperature of the solvent c. stirring the solution d. removing solute

Which list of elements contains only metals? A. carbon, iodine, tin B. tin, copper, cesium C. helium, iron, copper D. iodine, carbon, argon

How matter moves from the beginning to the end of this food chain.

How many grams of NaOH are produced with the reaction of 5.00 moles of water?

Describe the physical properties of water

Which element has the same number of valence electrons as oxygen--. a. Neon-b. Nitrogen-c. Sulfur-d. Fluorine

Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?

Which piece of glassware is best suited for making accurate dilutions?