{"id":256081,"date":"2025-07-13T19:56:33","date_gmt":"2025-07-13T19:56:33","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=256081"},"modified":"2025-07-13T19:56:36","modified_gmt":"2025-07-13T19:56:36","slug":"write-the-chemical-formula-for-the-following-compound","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/13\/write-the-chemical-formula-for-the-following-compound\/","title":{"rendered":"Write the chemical formula for the following compound"},"content":{"rendered":"\n
Write the chemical formula for the following compound<\/pre>\n\n\n\n
\"\"<\/figure>\n\n\n\n
The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n
Here are the correct chemical formulas for the compounds listed in the image.<\/p>\n\n\n\n
a) RbNO\u2082<\/strong>
b) K\u2082S<\/strong>
c) Mg\u2083(PO\u2084)\u2082<\/strong>
d) CaHPO\u2084<\/strong>
e) KH\u2082PO\u2084<\/strong>
f) IF\u2087<\/strong>
g) (NH\u2084)\u2082SO\u2084<\/strong>
h) AgClO\u2084<\/strong>
i) BCl\u2083<\/strong>
j) CuCN<\/strong>
k) Cu(CN)\u2082<\/strong>
l) PbCO\u2083<\/strong>
m) Pb(CO\u2083)\u2082<\/strong><\/p>\n\n\n\n
Writing the chemical formula for a compound requires understanding the rules of chemical nomenclature. The primary step is to identify whether the compound is ionic or covalent. For ionic compounds, which typically consist of a metal and a nonmetal or a polyatomic ion, the formula is determined by balancing the charges of the cation (positive ion) and the anion (negative ion) to create a neutral compound. The charge of main group elements can often be predicted from their position in the periodic table. For transition metals, the charge is usually indicated by a Roman numeral in the name. Polyatomic ions have specific, established formulas and charges that must be known.<\/p>\n\n\n\n
For covalent compounds, formed between nonmetals, Greek prefixes are used in the name to denote the number of atoms of each element in the molecule.<\/p>\n\n\n\n
Here is the breakdown for each compound:<\/p>\n\n\n\n
a) Rubidium (Rb) is a Group 1 metal and forms a +1 ion (Rb\u207a). Nitrite is a polyatomic ion with the formula NO\u2082\u207b. The +1 and -1 charges balance, giving the formula RbNO\u2082.<\/p>\n\n\n\n
b) Potassium (K) is a Group 1 metal, forming a K\u207a ion. Sulphide is the anion of sulfur (S), a Group 16 element, which forms a -2 ion (S\u00b2\u207b). Two K\u207a ions are needed to balance one S\u00b2\u207b ion, resulting in K\u2082S.<\/p>\n\n\n\n
c) Magnesium (Mg) is a Group 2 metal, forming an Mg\u00b2\u207a ion. Phosphate is the polyatomic ion PO\u2084\u00b3\u207b. To balance the charges, three Mg\u00b2\u207a ions and two PO\u2084\u00b3\u207b ions are needed, giving the formula Mg\u2083(PO\u2084)\u2082.<\/p>\n\n\n\n
d) Calcium (Ca), a Group 2 metal, forms a Ca\u00b2\u207a ion. The hydrogen phosphate ion has the formula HPO\u2084\u00b2\u207b. The +2 and -2 charges balance perfectly, so the formula is CaHPO\u2084.<\/p>\n\n\n\n
e) Potassium (K) forms a K\u207a ion. The dihydrogen phosphate ion has the formula H\u2082PO\u2084\u207b. The +1 and -1 charges balance, yielding KH\u2082PO\u2084.<\/p>\n\n\n\n
f) Iodine heptafluoride is a covalent compound. The name indicates one iodine (I) atom and seven (hepta) fluorine (F) atoms, so the formula is IF\u2087.<\/p>\n\n\n\n
g) Ammonium is the polyatomic cation NH\u2084\u207a. Sulphate is the polyatomic anion SO\u2084\u00b2\u207b. Two ammonium ions are required to balance the charge of one sulphate ion. The formula is (NH\u2084)\u2082SO\u2084.<\/p>\n\n\n\n
h) Silver (Ag) typically forms a +1 ion (Ag\u207a). Perchlorate is the polyatomic anion ClO\u2084\u207b. The charges balance, making the formula AgClO\u2084.<\/p>\n\n\n\n
i) Boron trichloride is a covalent compound. The name indicates one boron (B) atom and three (tri) chlorine (Cl) atoms, giving the formula BCl\u2083.<\/p>\n\n\n\n
j) Copper (I) indicates a copper ion with a +1 charge (Cu\u207a). Cyanide is the polyatomic anion CN\u207b. The charges balance, so the formula is CuCN.<\/p>\n\n\n\n
k) Copper (II) indicates a copper ion with a +2 charge (Cu\u00b2\u207a). To balance the -1 charge of the cyanide ion (CN\u207b), two cyanide ions are needed. The formula is Cu(CN)\u2082.<\/p>\n\n\n\n
l) Lead (II) indicates a lead ion with a +2 charge (Pb\u00b2\u207a). The carbonate ion is CO\u2083\u00b2\u207b. The charges balance, resulting in the formula PbCO\u2083.<\/p>\n\n\n\n
m) Lead (IV) indicates a lead ion with a +4 charge (Pb\u2074\u207a). To balance this, two carbonate ions (CO\u2083\u00b2\u207b) are needed, giving the formula Pb(CO\u2083)\u2082.<\/p>\n\n\n\n
\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"
Write the chemical formula for the following compound The Correct Answer and Explanation is: Here are the correct chemical formulas for the compounds listed in the image. a) RbNO\u2082b) K\u2082Sc) Mg\u2083(PO\u2084)\u2082d) CaHPO\u2084e) KH\u2082PO\u2084f) IF\u2087g) (NH\u2084)\u2082SO\u2084h) AgClO\u2084i) BCl\u2083j) CuCNk) Cu(CN)\u2082l) PbCO\u2083m) Pb(CO\u2083)\u2082 Writing the chemical formula for a compound requires understanding the rules of chemical nomenclature. The primary step is to identify whether the compound is ionic or covalent. […]<\/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-256081","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/256081","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=256081"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/256081\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=256081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=256081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=256081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}