Presentation on theme: "Changes in Matter Physical phase changes dissolving crushing tearing"— Presentation transcript:
1Changes in Matter Physical phase changes dissolving crushing tearing _________ Changes – identity of substance does _____ changeExamples:_______________________________________notphase changesdissolvingcrushingtearing
2Changes in Matter Chemical water ________ Changes – identity of substance changes; _____ substance formed because atoms are rearrangedExamples:hydrogen + oxygen _______hydrochloric acid + sodium hydroxide ______________+ ________newwatersodium chloridewater
3Changes in Matter left right Reactants – substances on ____ side of arrowProducts – substances on ______ side of arrowhydrogen + oxygen waterhydrochloric acid + sodium hydroxidesodium chloride waterright
4Evidence of a chemical change: bubblingGas (or smoke) production – _________, new _______odorWhen vinegar and baking soda are mixed, the solution bubbles as carbon dioxide forms.
5Evidence of a chemical change: Precipitate formation – two ____ solutions produce a ______ substance when mixedclearcloudyWhen solutions of sodium sulfide and cadmium nitrate are mixed, cadmium sulfide, a solid precipitate forms.
6Evidence of a chemical change: Energy release or absorption – ____, ____heatlightWhen aluminum reacts with Iron (III) oxide in the clay pot, energy is released as heat and light.
7Evidence of a chemical change: Color______ change in the reaction systemWhen phenolphthalein is added to ammonia dissolved in water, a color change from colorless to pink occurs.