Five grams of a white, solid chemical called calcium chloride is added to 15 grams of water at 22oC. Several observations are made. Which observation best indicates that a new substance has formed as a result of a chemical reaction?

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

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.

Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.