{"id":"act_practice_pdf:pt2:science:002","source_id":"act_practice_pdf","source_item_id":"pt2-science-002","external_id":null,"program":"ACT","section":"science","category_code":"IOD","category":"Interpretation of Data","subcategory_code":null,"subcategory":null,"form_id":"act_practice_pdf:pt2","passage_id":"act_practice_pdf:pt2:science:p1","position":2,"scored":true,"layout_warning":null,"stem":"For the n-alkanes listed in Table 1, as the number of carbon atoms per molecule increases, the BP at 1 atm:","stimulus":"","stimulus_html":null,"stem_html":"<p>For the n-alkanes listed in Table 1, as the number of carbon atoms per molecule increases, the BP at 1 atm:</p>","rationale_html":null,"correct_answer":["F"],"equiv_key":"f54a962d349f7a37fa81d404","has_media":false,"has_mathml":false,"has_table":false,"section_label":"Science","options":[{"label":"F","content_html":"<p>increases only.</p>","ord":0},{"label":"G","content_html":"<p>decreases only.</p>","ord":1},{"label":"H","content_html":"<p>increases and then decreases.</p>","ord":2},{"label":"J","content_html":"<p>decreases and then increases.</p>","ord":3}],"passage":{"id":"act_practice_pdf:pt2:science:p1","source_id":"act_practice_pdf","form_id":"act_practice_pdf:pt2","section":"science","number":"I","kind":null,"title":null,"content_html":"<p>Alkanes are chemical compounds consisting of only carbon and hydrogen atoms. Two types of alkanes are n-alkanes (molecules in which the carbon atoms are bonded together to form a chain) and cycloalkanes (molecules in which the carbon atoms are bonded together to form a ring). Figure 1 shows an example of an n-alkane and an example of a cycloalkane. Figure 1 H H H H H C H H H C C C H C C H H H H H n-alkane cycloalkane Table 1 shows, for each of 7 n-alkanes, the name, chemical formula, melting point (MP) at 1 atmosphere (atm) of pressure, and boiling point (BP) at 1 atm. Table 1 Chemical MP BP Alkane formula (°C) (°C) Propane C 3 H 8 −187 −42 Butane C 4 H 10 −138 −1 Pentane C 5 H 12 −130 36 Hexane C 6 H 14 −95 69 Heptane C 7 H 16 −91 98 Octane C 8 H 18 −57 126 Nonane C 9 H 20 − 53 151 several passages in this test. by several questions. After the best answer to each corresponding oval on your may refer to the passages as a calculator on this test. Table 2 shows, for each of 7 cycloalkanes, the name, chemical formula, MP at 1 atm, and BP at 1 atm. Table 2 Chemical MP BP Alkane formula (°C) (°C) Cyclopropane C 3 H 6 −128 −31 Cyclobutane C 4 H 8 −91 13 Cyclopentane C 5 H 10 −93 49 Cyclohexane C 6 H 12 7 81 Cycloheptane C 7 H 14 −8 119 Cyclooctane C 8 H 16 15 151 Cyclononane C 9 H 18 11 173</p>","ord":1},"attribution":{"source_id":"act_practice_pdf","source_name":"Official ACT full-length practice tests (PDF)","rights_holder":"ACT Education Corp.","canonical_url":"https://www.act.org/content/act/en/products-and-services/the-act/test-preparation.html","retrieved_from":"https://www.act.org/content/act/en/products-and-services/the-act/test-preparation.html","attribution":"Full-length ACT practice tests © ACT Education Corp., published free at act.org. Questions are retired items from previous ACT administrations.","disclaimer":"Extracted from a print-layout PDF: equations, figures and charts do not survive as text. Use the original PDF for anything that renders poorly. ACT® is a registered trademark of ACT Education Corp., which is not affiliated with, does not sponsor, and does not endorse this project.","license":"ACT Education Corp. copyright. Published free for personal test preparation; not licensed for redistribution.","redistributable":false,"item_count":342},"equivalents":[]}