Multiple ChoiceWhich of the following best describes what happens to an atom if the electrons in its outer shell are altered?32views
Multiple ChoiceWhich of the following is the only sure sign that a chemical change is taking place?42views
Multiple ChoiceMagnesium and calcium have similar chemical properties because their atoms in the ground state have:75views
Multiple ChoiceIn an experiment measuring the effect of temperature on the solubility of a salt, which of the following is the dependent variable?206views