TEKS Science Grade 8 - 8.5.E: Investigate How Evidence Of Chemical Reactions Indicate New Substances Are Formed
Quiz by Grade 8 Science - Texas Education Agency
Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)
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9 questions
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- Q160s8.5e
- Q2During an investigation, a student combined the two clear, colorless solutions shown below. The student observed that the temperature changed from 25°C to 23°C 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?Some of the water froze into ice crystalsThe solutions reacted chemically.One of the original compounds came out of solutionRapid evaporation of water occurred, leaving a solid.60s8.5e
- Q3Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?The shape of the coal changes.Oxygen is present.A new substance is produced.Coal is made up of more than one element.60s8.5e
- Q4For an investigation a student poured a blue solution of CuSO into a beaker. The student 4 placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. The student inferred that a chemical reaction occurred. What evidence supports this inference?The zinc metal remained silver-colored and shiny.None of theseA dark solid formed on the zinc metal.The CuSO solution turned blue when the zinc metal was added.60s8.5e
- Q5A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?The pan was lined with aluminum foil.The liquid solution changed color.The hot water cooled.Hot water heated the aluminum foil.60s8.5e
- Q6Some students in a chemistry lab conducted an investigation in which they added four different solid substances to separate beakers of water. They stirred the mixtures for one minute and then recorded their observations in the table below. Which substance most likely caused a new substance to be formed when mixed with water?Substance 2Substance 1Substance 3Substance 460s8.5e
- Q7A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table below. In which investigation is it least likely that the liquids reacted chemically?134260s8.5e
- Q8A student obtains two strips of magnesium, Mg, ribbon that are each 3 cm long. One strip of magnesium is placed in a test tube containing 5 mL of water, and the other strip is placed in a test tube containing 5 mL of hydrochloric acid, HCl. Both liquids are at room temperature. The student’s observations are recorded in the table. Which statement is not supported by the student’s observations?A gas is released in Test Tube 2.Energy is released in the reaction involving hydrochloric acid.The substances in both test tubes are reactive only at high temperatures.A chemical reaction takes place between magnesium and hydrochloric acid.60s8.5e
- Q9Nitrogen dioxide is a gas that can be generated by emissions from vehicles and factories. It can also be generated by natural sources, such as forest fires, lightning, and microbial activity in soil. The equation for producing nitrogen dioxide is shown below. Which of these provides evidence that a chemical reaction occurs?A gas is present.The state of matter remains the same.The total number of atoms remains unchanged.A brown gas is produced.60s8.5e
