Lesson Check: Molecular Structure Answer Key PDF

Answer Key with Questions Lesson Check: Molecular Structure 1) A material whose particle composition allows heat and electricity to pass through it easily are described as having a high ____. A) conductivity B) density C) hardness D) w...

Answer Key with Questions Lesson Check: Molecular Structure 1) A material whose particle composition allows heat and electricity to pass through it easily are described as having a high ____. A) conductivity B) density C) hardness D) weight Correct Answer A) conductivity 2) You can separate the particles that make up sugar from the particles that make up sand because sugar are ____ and sand are not. A) malleable B) ductile C) soluble in water D) acidic Correct Answer C) soluble in water Copyright © 2019, McGraw-Hill Education. 1/7 This content was printed for the exclusive use of licensed students. Answer Key with Questions Lesson Check: Molecular Structure 3) Substances are either elements or mixtures. True False Correct Answer False 4) Which properties describe elements that are nonmetal gases? A) composed of an extended structure B) composed of individual atoms or diatomic molecules C) high melting point D) low melting point E) strong attractions between particles F) weak attractions between particles Correct Answer B) composed of individual atoms or diatomic molecules D) low melting point E) strong attractions between particles Copyright © 2019, McGraw-Hill Education. 2/7 This content was printed for the exclusive use of licensed students. Answer Key with Questions Lesson Check: Molecular Structure 5) Which of the following would be modeled by small particles made up of atoms of two kinds of elements? A) gold B) oxygen C) neon D) water Correct Answer D) water 6) Which is a property of metals as a result of their extended structures of atoms? A) are poor conductors of electricity B) dissolve in water C) have low melting points D) can be hammered into sheets Correct Answer D) can be hammered into sheets Copyright © 2019, McGraw-Hill Education. 3/7 This content was printed for the exclusive use of licensed students. Answer Key with Questions Lesson Check: Molecular Structure 7) A substance has an extended structure composed of two different elements. The elements are a metal and a nonmetal. Which property would this substance most likely have? A) can be hammered into sheets B) has a high melting point C) does not dissolve in water D) is a gas at room temperature Correct Answer B) has a high melting point 8) Because they have an extended structure, elements that are tend to be in the state at room temperature. Correct Answer metals solid 9) Why does oil not dissolve in water? A) Oil is an extended structure, and water is made of polar molecules. B) Oil is an extended structure, and water is made of nonpolar molecules. C) Oil is made of nonpolar molecules, and water is made of polar molecules. D) Oil is made of polar molecules, and water is made of nonpolar molecules. Correct Answer C) Oil is made of nonpolar molecules, and water is made of polar molecules. Copyright © 2019, McGraw-Hill Education. 4/7 This content was printed for the exclusive use of licensed students. Answer Key with Questions Lesson Check: Molecular Structure 10) Bethany observes a white crystal that is cube shaped under a microscope. Based on this observation, Bethany thinks the crystal could be sodium chloride, or table salt. Because the crystal has an extended structure, she knows that sodium chloride is not a molecule. Bethany uses gray and white spheres, representing the atoms in sodium chloride, to make a model of the crystal’s most likely structure, as shown. a. Provide two reasons why the model accurately represents sodium chloride. Support your reasons with evidence from the model. Copyright © 2019, McGraw-Hill Education. 5/7 This content was printed for the exclusive use of licensed students. Answer Key with Questions Lesson Check: Molecular Structure b. Predict whether the melting point should be high or low based on the model. Correct Answer Answers may vary. Copyright © 2019, McGraw-Hill Education. 6/7 This content was printed for the exclusive use of licensed students. Answer Key with Questions Lesson Check: Molecular Structure Explanation a. The model accurately represents sodium chloride because: ▪ sodium chloride is composed of two kinds of atoms, and the model uses two different colors of spheres to represent the two kinds of atoms in sodium chloride. ▪ sodium chloride is an extended structure, and the model shows a repeating pattern of sodium and chlorine atoms. b. Sodium chloride should have a high melting point because the model shows that there are likely many attractions between the particles within the extended structure. Copyright © 2019, McGraw-Hill Education. 7/7 This content was printed for the exclusive use of licensed students. Extended-Response Rubric Level of Evidence of Understanding Understanding Student response provides clear evidence of using the dimensions* to make sense of scientific phenomena and/or to design solutions to problems. Student is able to: Demonstrating ▪ provide two reasons why the model accurately represents sodium chloride and support 3 Expected the reasons with evidence from the model; Understanding AND ▪ predict whether the melting point should be high or low based on the model. Student response provides partial evidence of using the dimensions* to make sense of scientific phenomena and/or to design solutions to problems. The response lacks some critical information and details or contains some errors. Student is able to: ▪ provide two reasons why the model accurately represents sodium chloride and support Progressing the reasons with evidence from the model BUT the prediction of whether the melting 2 toward point should be high or low based on the model contains errors or is not provided; Understanding OR ▪ provide one reason why the model accurately represents sodium chloride and support the reasons with evidence from the model and predict whether the melting point should be high or low based on the model BUT the second reason why the model represents sodium chloride contains errors or is not provided. Beginning Student response is incomplete or provides minimal evidence of using the dimensions* to 1 to Develop make sense of scientific phenomena and/or to design solutions to problems. Understanding Student does not respond or student response is inaccurate, irrelevant, or contains Not Showing 0 insufficient evidence of using the dimensions* to make sense of scientific phenomena Understanding and/or to design solutions to problems. *As outlined in the Performance Expectations (PE) of the NGSS, the three dimensions are the disciplinary core ideas (DCI), science and engineering practices (SEP), and crosscutting concepts (CCC). Note that due to the complexity of the PEs, individual assessment items may not address all three dimensions. Scoring Notes: Possible answers include: a. The model accurately represents sodium chloride because: ▪ sodium chloride is composed of two kinds of atoms, and the model uses two different colors of spheres to represent the two kinds of atoms in sodium chloride. ▪ sodium chloride is an extended structure, and the model shows a repeating pattern of sodium and chlorine atoms. b. Sodium chloride should have a high melting point because the model shows that there are likely many attractions between the particles within the extended structure.