{"id":232150,"date":"2025-06-11T18:34:06","date_gmt":"2025-06-11T18:34:06","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=232150"},"modified":"2025-06-11T18:34:08","modified_gmt":"2025-06-11T18:34:08","slug":"part-a-k-and-se2-express-your-answer-as-a-chemical-formula","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/11\/part-a-k-and-se2-express-your-answer-as-a-chemical-formula\/","title":{"rendered":"Part A K+ and Se2- Express your answer as a chemical formula."},"content":{"rendered":"\n

Part A K+ and Se2- Express your answer as a chemical formula. A chemical reaction does not occur for this question. Part B Ga3+ and Cl- Express your answer as a chemical formula. Part C A chemical reaction does not occur for this question. Ca2+ and P3- Express your answer as a chemical formula. Part D A chemical reaction does not occur for this question. Sc3+ and O2- Express your answer as a chemical formula. Part E A chemical reaction does not occur for this question. Sr2+ and As3- Express your answer as a chemical formula. A chemical reaction does not occur for this question<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

Part A:<\/strong>
K\u207a and Se\u00b2\u207b \u2192 K\u2082Se<\/strong><\/p>\n\n\n\n

Part B:<\/strong>
Ga\u00b3\u207a and Cl\u207b \u2192 GaCl\u2083<\/strong><\/p>\n\n\n\n

Part C:<\/strong>
Ca\u00b2\u207a and P\u00b3\u207b \u2192 Ca\u2083P\u2082<\/strong><\/p>\n\n\n\n

Part D:<\/strong>
Sc\u00b3\u207a and O\u00b2\u207b \u2192 Sc\u2082O\u2083<\/strong><\/p>\n\n\n\n

Part E:<\/strong>
Sr\u00b2\u207a and As\u00b3\u207b \u2192 Sr\u2083As\u2082<\/strong><\/p>\n\n\n\n

\n\n\n\n

Explanation:<\/h3>\n\n\n\n

When forming ionic compounds, the total positive charge from the cations (positively charged ions) must balance the total negative charge from the anions (negatively charged ions). The chemical formula represents the simplest whole-number ratio of ions needed to achieve electrical neutrality.<\/p>\n\n\n\n

In Part A<\/strong>, potassium (K\u207a) is a Group 1 metal and forms a +1 ion. Selenium (Se\u00b2\u207b) forms a -2 anion. To balance the charges, two K\u207a ions are needed for every one Se\u00b2\u207b ion, resulting in K\u2082Se<\/strong>.<\/p>\n\n\n\n

In Part B<\/strong>, gallium (Ga\u00b3\u207a) forms a +3 ion, and chloride (Cl\u207b) forms a -1 ion. Three Cl\u207b ions are required to balance one Ga\u00b3\u207a ion. Therefore, the formula is GaCl\u2083<\/strong>.<\/p>\n\n\n\n

In Part C<\/strong>, calcium (Ca\u00b2\u207a) and phosphorus (P\u00b3\u207b) combine in a 3:2 ratio to balance the charges: three Ca\u00b2\u207a (total +6) and two P\u00b3\u207b (total -6) yield the neutral compound Ca\u2083P\u2082<\/strong>.<\/p>\n\n\n\n

In Part D<\/strong>, scandium (Sc\u00b3\u207a) and oxide (O\u00b2\u207b) form Sc\u2082O\u2083<\/strong> to balance the charges: two Sc\u00b3\u207a ions (total +6) and three O\u00b2\u207b ions (total -6).<\/p>\n\n\n\n

In Part E<\/strong>, strontium (Sr\u00b2\u207a) and arsenide (As\u00b3\u207b) also require a 3:2 ratio. Three Sr\u00b2\u207a ions (+6) balance two As\u00b3\u207b ions (-6), forming Sr\u2083As\u2082<\/strong>.<\/p>\n\n\n\n

These compounds are ionic<\/strong> because they are formed through the transfer of electrons from metals (which lose electrons to form cations) to nonmetals (which gain electrons to form anions). The resulting electrostatic attraction between oppositely charged ions holds the compound together. The chemical formula of each compound reflects the smallest whole-number ratio of ions that achieves charge neutrality.<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

Part A K+ and Se2- Express your answer as a chemical formula. A chemical reaction does not occur for this question. Part B Ga3+ and Cl- Express your answer as a chemical formula. Part C A chemical reaction does not occur for this question. Ca2+ and P3- Express your answer as a chemical formula. Part […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-232150","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/232150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=232150"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/232150\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=232150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=232150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=232150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}