Evidence of a chemical Reaction
Quiz by Maribel Garcia
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- Q 1/6Score 0Which investigation results do NOT represent evidence of a chemical reaction?29
6 questions
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- Q1Which investigation results do NOT represent evidence of a chemical reaction?120s
- Q2Two students investigate chemical reactions of three unknown liquids. Which of the following is the best experimental design?120s
- Q3Two students recorded temperature values during a laboratory investigation. From the recorded data, students created the following graph. What can the students conclude based on this information?An increase in temperature is evidence that a physical and chemical change have occurred.An increase in temperature is evidence that a chemical change has occurred.A decrease in temperature is evidence that a physical change has occurred.A decrease in temperature is evidence that a chemical change has occurred.120s
- Q4Students combine 15 g of calcium chloride and 30 mL of water in a clear plastic cup. The resulting solution increases in temperature. What most likely causes the temperature increase?Calcium chloride and water are heated by an outside source.Water evaporates, leaving behind calcium chloride crystals.Calcium chloride reacts with water, producing new substances and heat.Calcium chloride dissolves in the water.120s
- Q5Mass and volume measurements from a vinegar and baking soda investigation are shown below, both before and after the chemical reaction. What evidence supports the law of conservation of mass?The volume of the products is more than the volume of the reactants, so it does not support the law of conservation of mass.The mass of the gas is more than the mass of the baking soda, so the mass is constant.The mass remains constant before and after the chemical reaction.The density of the products is less than the reactants, so the mass is constant120s
- Q6Combustion is a process in which fuel, oxygen, and heat react to produce large amounts of energy. The space shuttle uses the fuel hydrogen gas to propel itself into outer space. What evidence of a chemical reaction does the space shuttle exhibit?Disintegration of the elementChange of colorEmission of lightFormation of precipitate120s
