Chemical Changes
Quiz by Carolina Carner
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17 questions
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- Q1Which of the following correctly identifies a precipitate in a chemical reaction?Two substances are separated using an electrical currentTwo substances react in solution, forming a new substance which is a solidA substance decreases in volumeWater condenses to form rain30s
- Q2Which of the following identifies a chemical change?A piece of paper burningA piece of paper being cut in halfA piece of paper being folded and unfolded30s
- Q3An experiment was performed and the observations are listed. Which substance showed a chemical change?Substance 4Substance 1Substance 3Substance 230s
- Q4The elements sodium (Na) and chlorine (Cl) combine to form sodium chloride (NaCl). What must happen for NaCl to form? Use the information below and your knowledge of science to answer the question.CDBA60s
- Q5A group of students conducted an experiment where they combine different substances together and record their observations which result from the combination. Use the information below and your knowledge of science to answer the question. What combination of substances shows the sign of a chemical change?ABDC60s
- Q6Which of these is an example of a chemical change?A glass breakingA bike rustingMelting chocolateWater evaporating30s
- Q7What type of change is occurring in the picture below?PhysicalChemicalBiological30s
- Q8During a chemical change, -A pure substance is formedSubstances can be physically separatedA new substance with new properties is formedAll substances keep their individual properties30s
- Q9The teacher sets a marshmallow on fire. The marshmallow begins to turn black and release carbon dioxide gas. This is because –it is an example of a physical change.it is evidence that a new substance with new properties has formed.the state of matter of the marshmallow is changing.the properties of the marshmallow are not changing.60s
- Q10A scientist spilled a couple of drops of dilute hydrocholric acid on a lab table. For safety purposes, scientists spilled some baking soda onto the spill. What observation would provide the best evidence of a chemical reaction?Some of the baking soda dissolved in the hydrochloric acid.The baking soda absorbed the hydrochloric acid.The baking soda and hydrochloric acid combined, and bubbles formed.The hydrochloric acid evaporated, leaving only the baking soda.60s
- Q11Which of the following is NOT a chemical changeAn ice cube meltingAn egg fryingA nail rustingA match burning30s
- Q12Which table correctly identifies the changes taking place in the table?CABD60s
- Q13The student observed that the temperature changed from 25 degrees to 23 degrees Celsius when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?One of the original compounds came out of solution.The solutions reacted chemically.Rapid evaporation of water occurred, leaving a solid.Some of the water froze into ice crystals.60s
- Q14A student puts two different solutions into a test tube. When the substances touch each other a white substance forms that sinks to the bottom of the test tube. What kind of chemical change occurred?Production of a precipitateChange in temperatureProduction of a gas60s
- Q15A nail sat outside for a year and it started to rust. What evidence is there that a chemical change has occurred?Color changeProduction of lightRelease of a gasProduction of a precipiate60s
