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Mrs. Mack 8th Grade Science A new substance is formed ___________ A: During a physical B: During a chemical change D: In an element change C: In a mixture During a chemical change B A chemical reaction in which energy is absorbed is a(n): A: Colloid B: catalyst C: Exothermic reaction D: Endothermic reaction Endothermic reaction D What is a substance that cannot be broken down into any other substances by chemical or physical means? A: A colloid B: A substance C: A solution D: An element An element D The fact that matter is not created or destroyed in any physical or chemical change is: A: chemistry B: Law of reactions C: Law of conservation of D: A catalyst mass Law of conservation of mass C What are the properties of an acid? Sour taste, pH 0-6.9, A: feels slippery, turns red litmus paper blue Sour taste, pH 7.0, reacts with metals, B: turns blue litmus paper red Bitter taste, pH 0-6.9, reacts with metals, C: turns red litmus paper blue Sour taste, pH 0-6.9, reacts with metals, D: turns blue litmus paper red Sour taste, 0-6.9, reacts with metals, turns blue litmus paper red D When left in the open air, liquid solutions can change to gas, leaving solid components behind. What method of separating mixtures is this? A: evaporation B: distillation C: Magnetic attraction D: filtration Evaporation A Which of the following is not a pure substance? A: Distilled water B: oxygen C: air D: Carbon dioxide Air C Which method of separating mixtures would you Use to separate salt from a saltwater solution? A: Magnetic attraction B: Filtration C: Distillation D: Evaporation Filtration B A piece of paper was burned and became a pile of ashes. The mass of the ashes was less than the mass of the paper before it was burned. What can you conclude based on the law of conservation of mass? The chemical reaction The chemical reaction destroyed matter A: created matter B: The chemical reaction C: took place in an open system The reaction did not work as expected D: because it took place in a closed system. The chemical reaction took place in an open system C What is a mixture that is so evenly mixed that you can’t differentiate the parts simply by looking at it? A: Homogeneous mixture B: Pure substance C: Heterogeneous D: Pure mixture mixture Homogeneous mixture A Some examples of a chemical change are: Combustion, A: oxidation, B: Combustion, dissolving, cutting D: Oxidation, dissolving, photosynthesis photosynthesis C: Dissolving, crushing, photosynthesis Combustion, oxidation, photosynthesis A Frying an egg is an example of a: A: solution B: Physical change C: Chemical change D: Mechanical change Chemical change C How does the maximum amount of salt that will dissolve in a given amount of water change if the temperature of the water is increased? A: It increases steadily B: It decreases steadily C: It remains the same D: It increases then decreases It increases steadily A Blowing into a balloon is an example of a A: Physical change B: Chemical change C: Mechanical change D: Electrical change Physical change A Factors that can affect chemical reactions include: A: Surface area and color B: C: Temperature and color D: Temperature and breakability Surface area and temperature Surface area and temperature D Great Job!!!! Thank you for playing!