In the following diagrams, the spheres represent particles. Different shadings respresent different particles. Which of the following samples is a pure substance?

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous