Rita wants to make some toast for breakfast. she puts a slice of bread in the toaster. after 3 min, rita notices that the sides of the bread are black. what has happened?

a. the bread has undergone a change of state.

b. the bread has undergone a change in density.

c. some of the matter in the bread was destroyed.

d. new substances have formed as the result of a chemical change.

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

The grooves or folds of the brain are called

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.