26 Polyatomic Ions For High School Chemistry
Covers 26 common polyatomic ions. Covered in both name and formula. Formula must be done with the ion's name in parenthesis and the charge immediately following and name must be spelled correctly. For example, (MnO4)- Permanganate.
Questions and Answers
- 1.
Ammonium formula
Explanation
The correct answer is (NH4)+ because the formula represents the ammonium ion. The (NH4)+ ion consists of one nitrogen atom bonded to four hydrogen atoms. The plus sign indicates that the ion has a positive charge, meaning it has lost one electron. This ion is commonly found in compounds like ammonium chloride and ammonium nitrate. It is important to note that the ammonium ion is a cation, meaning it is positively charged and can easily form bonds with negatively charged ions.Rate this question:
- 2.
Nitrite formula
Explanation
The given correct answer is (NO2)-. This is the formula for nitrite, which is an ion with a negative charge. The (NO2)- ion consists of one nitrogen atom bonded to two oxygen atoms, and it carries a negative charge to balance the positive charge of other ions in a compound. Nitrite is commonly found in various chemical compounds and is used in different industrial processes.Rate this question:
- 3.
Nitrate formula
Explanation
The correct answer is (NO3)- because the question asks for the formula of nitrate, which is represented by the chemical symbol NO3 with a negative charge. The negative charge indicates that nitrate has gained an extra electron, resulting in a negatively charged ion.Rate this question:
- 4.
Sulfite formula
Explanation
The correct answer is (SO3)2-. This is the formula for the sulfite ion, which consists of one sulfur atom bonded to three oxygen atoms. The 2- charge indicates that the ion has gained two extra electrons, giving it a negative charge. The parentheses and subscript 2 indicate that there are two sulfite ions present in the compound.Rate this question:
- 5.
Sulfate formula
Explanation
The answer (SO4)2- is correct because it represents the sulfate ion. The sulfate ion consists of one sulfur atom bonded to four oxygen atoms, with a charge of -2. The (SO4)2- formula indicates that there are two sulfate ions present, each with a charge of -2. This formula is commonly used to represent the sulfate ion in chemical reactions and formulas.Rate this question:
- 6.
Thiosulfate formula
Explanation
The given answer, (S2O3)2-, is the correct formula for thiosulfate. Thiosulfate is an anion composed of two sulfur atoms and three oxygen atoms. The 2- charge indicates that it has gained two electrons, making it negatively charged. The formula (S2O3)2- accurately represents the composition and charge of thiosulfate.Rate this question:
- 7.
Hydroxide formula
Explanation
The correct answer is (OH)- because the formula (OH)- represents a hydroxide ion. The hydroxide ion consists of one oxygen atom and one hydrogen atom, with a negative charge. It is commonly found in compounds such as bases and alkalis.Rate this question:
- 8.
Cyanide formula
- 9.
Phosphate formula
Explanation
The answer (PO4)3- represents the formula for phosphate. The "PO4" part indicates that it is composed of one phosphorus atom and four oxygen atoms. The superscript "3-" indicates that the phosphate ion carries a charge of -3, meaning it has gained three extra electrons to achieve a stable state. The overall formula (PO4)3- is commonly used to represent the phosphate ion in various chemical reactions and compounds.Rate this question:
- 10.
Hydrogen Phosphate formula
Explanation
The answer (HPO4)2- is the formula for hydrogen phosphate. The (HPO4)2- ion consists of one hydrogen atom bonded to a phosphate group, which is composed of one phosphorus atom and four oxygen atoms. The negative charge of 2- indicates that the ion has gained two electrons, resulting in a net negative charge. This formula is commonly used in chemistry to represent the hydrogen phosphate ion.Rate this question:
- 11.
Dihydrogen Phosphate formula
Explanation
The correct answer is (H2PO4)- because the formula represents a dihydrogen phosphate ion. The "- " indicates that it carries a negative charge. The presence of two hydrogen atoms (H2) indicates that there are two hydrogen ions attached to the phosphate (PO4) group. Therefore, the correct formula for dihydrogen phosphate is (H2PO4)-.Rate this question:
- 12.
Chromate formula
Explanation
The given answer "(CrO4)2-" is the correct chromate formula. The formula indicates that there are two chromate ions present, each with a charge of -2. The chromate ion consists of one chromium atom bonded to four oxygen atoms. The overall charge of the ion is -2, indicating that it has gained two electrons to achieve stability. This formula is commonly used in chemistry to represent the chromate ion in various compounds and reactions.Rate this question:
- 13.
Dichromate formula
Explanation
The answer (Cr2O7)2- represents the formula for dichromate. The (Cr2O7)2- indicates that there are two dichromate ions present, each consisting of two chromium atoms (Cr) and seven oxygen atoms (O). The negative charge (-) signifies that the dichromate ion has a net charge of -2. This formula is commonly used in chemistry to represent the dichromate ion, which is an important oxidizing agent in various chemical reactions.Rate this question:
- 14.
Carbonate formula
Explanation
The given answer (CO3)2- is the correct formula for carbonate. The (CO3)2- ion consists of one carbon atom bonded to three oxygen atoms. The negative 2 charge indicates that the ion has gained two electrons to achieve a stable electron configuration. Carbonate ions are commonly found in compounds such as calcium carbonate (CaCO3) and sodium carbonate (Na2CO3).Rate this question:
- 15.
Hydrogen Carbonate (also known as Bicarbonate) formula
Explanation
The given correct answer is the formula for hydrogen carbonate, also known as bicarbonate. The formula is (HCO3)-, indicating that it consists of one hydrogen atom (H), one carbon atom (C), and three oxygen atoms (O), with an overall negative charge. This formula is commonly used in chemistry to represent the bicarbonate ion, which is important in many biological processes and chemical reactions.Rate this question:
- 16.
Hydronium formula
Explanation
The given correct answer is (H3O)+. This is the formula for hydronium, which is a positively charged ion formed when a water molecule gains a hydrogen ion. The formula indicates that there are three hydrogen atoms bonded to one oxygen atom, with an overall positive charge. Hydronium ions are commonly found in acidic solutions and play a crucial role in many chemical reactions.Rate this question:
- 17.
Hypochlorite formula
Explanation
The given correct answer is (ClO)-. This is the formula for hypochlorite, which is a negatively charged ion consisting of one chlorine atom and one oxygen atom. The negative charge indicates that the ion has gained an extra electron. Hypochlorite is commonly found in bleach and is used as a disinfectant and oxidizing agent.Rate this question:
- 18.
Chlorite formula
Explanation
The correct answer is (ClO2)- because the formula given represents the chlorite ion. The "- " symbol indicates that the ion has a negative charge. The chlorite ion consists of one chlorine atom bonded to two oxygen atoms, and it carries a single negative charge.Rate this question:
- 19.
Chlorate formula
Explanation
The correct answer is (ClO3)-. The chlorate formula refers to the negatively charged polyatomic ion composed of one chlorine atom and three oxygen atoms. The negative charge is indicated by the minus sign at the end of the formula.Rate this question:
- 20.
Perchlorate formula
Explanation
The correct answer is (ClO4)-. The formula for perchlorate ion is (ClO4)-.Rate this question:
- 21.
Acetate formula
Explanation
The given answer (C2H3O2)- is the formula for acetate ion. Acetate is a negatively charged ion that consists of two carbon atoms, three hydrogen atoms, and two oxygen atoms. The negative charge is indicated by the minus sign. This formula represents the chemical composition of acetate and is commonly used in chemical reactions and equations.Rate this question:
- 22.
Permanganate formula
Explanation
The given correct answer is (MnO4)-. This is the formula for permanganate. The negative sign indicates that the permanganate ion has a charge of -1. The ion consists of one manganese atom (Mn) and four oxygen atoms (O).Rate this question:
- 23.
Oxalate formula
Explanation
The given answer (C2O4)2- is the correct formula for oxalate. Oxalate is an anion with a charge of -2, indicated by the superscript 2-. The formula shows that it consists of two carbon atoms (C) and four oxygen atoms (O), with a total of six oxygen atoms. The subscript 2 indicates that there are two of each atom in the formula. Therefore, the correct formula for oxalate is (C2O4)2-.Rate this question:
- 24.
Peroxide Formula
Explanation
The answer is (O2)2- because the formula given, (O2)2-, indicates that there are two oxygen atoms bonded together with a charge of -2. The parentheses indicate that the oxygen atoms are bonded as a group, and the subscript 2 indicates that there are two of these groups. The negative charge of -2 indicates that the overall charge of the molecule is negative, likely due to the gain of two electrons.Rate this question:
- 25.
Bromite formula
Explanation
The given answer (BrO2)- is the correct formula for the bromite ion. The "Br" symbol represents the element bromine, and the "O2" indicates that there are two oxygen atoms present. The negative charge (-) indicates that the ion has gained an extra electron, giving it a net negative charge.Rate this question:
- 26.
Bromate formula
Explanation
The correct answer is (BrO3)-. The given formula represents the bromate ion, which consists of one bromine atom (Br) and three oxygen atoms (O) bonded together. The negative charge indicates that the ion has gained an extra electron. This ion is commonly found in compounds such as sodium bromate (NaBrO3) and potassium bromate (KBrO3), which are used in various industrial processes.Rate this question:
- 27.
(NH4)+ name
Explanation
The correct answer is Ammonium. Ammonium is the name for the cation (NH4)+, which consists of one nitrogen atom bonded to four hydrogen atoms. It is a positively charged ion that forms when ammonia (NH3) accepts a proton (H+) from an acid. Ammonium is commonly found in fertilizers and plays a vital role in plant nutrition.Rate this question:
- 28.
(NO2)- name
Explanation
The correct answer is Nitrite because the question is asking for the name of the (NO2)- ion. The (NO2)- ion is known as nitrite.Rate this question:
- 29.
(NO3)- name
Explanation
The correct answer for the given question is "Nitrate." Nitrate is the name for the (NO3)- ion. It is an anion that consists of one nitrogen atom and three oxygen atoms. Nitrate is commonly found in fertilizers and is an important nutrient for plants. It can also be found in some foods and is a component of the nitrogen cycle in the environment.Rate this question:
- 30.
(SO3)2- name
Explanation
The correct answer for the given question is "Sulfite." Sulfite refers to the chemical compound SO3 with a charge of 2-. It is commonly used in various industries, including food preservation, water treatment, and photography. Sulfite compounds are known for their antioxidant properties and are used as preservatives to prevent the growth of bacteria and fungi in food and beverages. They can also act as reducing agents and are involved in various chemical reactions.Rate this question:
- 31.
(SO4)2- name
Explanation
The correct answer is sulfate. The (SO4)2- ion is known as sulfate. It is a polyatomic ion composed of one sulfur atom bonded to four oxygen atoms. Sulfate is commonly found in various compounds, such as salts and acids, and is an important component in many chemical reactions and biological processes.Rate this question:
- 32.
(S2O3)2- name
Explanation
Thiosulfate is the correct name for the (S2O3)2- ion. The ion consists of two sulfur atoms bonded to three oxygen atoms, hence the prefix "thio-" indicating the presence of sulfur. The "-sulfate" suffix indicates the presence of oxygen atoms bonded to sulfur. Therefore, "thiosulfate" accurately describes the composition of the (S2O3)2- ion.Rate this question:
- 33.
(OH)- name
Explanation
The correct answer is "Hydroxide" because (OH)- is the chemical formula for the hydroxide ion. The hydroxide ion consists of one oxygen atom and one hydrogen atom, and it carries a negative charge. In chemistry, hydroxide is a common polyatomic ion that is found in many compounds and plays important roles in various chemical reactions.Rate this question:
- 34.
(CN)- name
Explanation
Cyanide is a highly toxic compound that consists of a carbon atom triple-bonded to a nitrogen atom. It is known for its deadly effects on living organisms, inhibiting their ability to use oxygen and disrupting cellular respiration. Exposure to cyanide can lead to severe health problems and even death. The compound is commonly associated with poisoning cases and is used in various industrial processes, such as gold mining and metal plating.Rate this question:
- 35.
(PO4)3- name
Explanation
The given correct answer for the question is "Phosphate". Phosphate refers to the anion with a charge of 3-, denoted as (PO4)3-. It is a polyatomic ion composed of one phosphorus atom bonded to four oxygen atoms. Phosphate is commonly found in various biological and chemical compounds, such as DNA, RNA, ATP, and phospholipids. Its name is derived from the combination of "phosphorus" and the suffix "-ate" indicating its negative charge.Rate this question:
- 36.
(HPO4)2- name
Explanation
The given compound, (HPO4)2-, is named hydrogen phosphate. This is because it consists of one hydrogen ion (H+) and one phosphate ion (PO43-). In this compound, the hydrogen ion acts as a cation and the phosphate ion acts as an anion. The prefix "hydrogen" is used to indicate the presence of the hydrogen ion in the compound, while "phosphate" indicates the presence of the phosphate ion. Therefore, the correct name for (HPO4)2- is hydrogen phosphate.Rate this question:
- 37.
(H2PO4)- name
Explanation
The correct answer is Dihydrogen Phosphate because the compound (H2PO4)- consists of two hydrogen ions (dihydrogen) and one phosphate ion. The prefix "di-" indicates that there are two hydrogen ions present, and "phosphate" refers to the presence of the phosphate ion. Therefore, the name Dihydrogen Phosphate accurately describes the composition of the compound.Rate this question:
- 38.
(CrO4)2- name
Explanation
The correct answer is "Chromate" because (CrO4)2- is a polyatomic ion that consists of one chromium atom bonded to four oxygen atoms. The name of this ion follows the naming convention for polyatomic ions, where the ending "-ate" is added to the root of the element's name. Therefore, the correct name for (CrO4)2- is chromate.Rate this question:
- 39.
(Cr2O7)2- name
Explanation
The given correct answer for the question is "Dichromate." This is because the chemical formula (Cr2O7)2- represents the dichromate ion. The prefix "di-" indicates that there are two chromium atoms in the ion, and the suffix "-ate" indicates that the ion has a negative charge. Therefore, the name of the ion is dichromate.Rate this question:
- 40.
(CO3)2- name
Explanation
The given correct answer for the question is "carbonate". In chemistry, the suffix "-ate" is commonly used to indicate the presence of oxygen in a compound. Carbonate is an example of an anion, which is a negatively charged ion, with a chemical formula of (CO3)2-. It consists of one carbon atom bonded to three oxygen atoms. Therefore, the name "carbonate" accurately represents the chemical composition of the (CO3)2- ion.Rate this question:
- 41.
(HCO3)- name
Explanation
The correct answer is Hydrogen Carbonate, Bicarbonate. The (HCO3)- ion is commonly known as hydrogen carbonate or bicarbonate. This ion consists of one hydrogen atom, one carbon atom, and three oxygen atoms. It is a polyatomic ion that plays a crucial role in maintaining the pH balance of bodily fluids. It acts as a buffer, helping to regulate the acidity or alkalinity of a solution. Therefore, both hydrogen carbonate and bicarbonate are correct names for this ion.Rate this question:
- 42.
(H30)+ name
Explanation
The correct answer is "Hydronium" because the given chemical formula "(H30)+" refers to a positively charged ion consisting of three hydrogen atoms bonded to an oxygen atom. This ion is commonly known as hydronium, which is formed when water molecules gain a proton (H+) through the process of protonation. Hydronium ions play a crucial role in acid-base chemistry and are responsible for the acidic nature of aqueous solutions.Rate this question:
- 43.
(ClO)- name
Explanation
The correct answer is "Hypochlorite." Hypochlorite is the name given to the (ClO)- ion. It is an anion that consists of a chlorine atom bonded to an oxygen atom with a single bond and has a negative charge. Hypochlorite is commonly found in bleach and is used as a disinfectant and bleaching agent.Rate this question:
- 44.
(ClO2)- name
Explanation
The correct answer is Chlorite. Chlorite is the name for the (ClO2)- ion. It is an anion that consists of one chlorine atom bonded to two oxygen atoms. Chlorite is commonly found in various chemical compounds and is used in industries such as water treatment and bleaching.Rate this question:
- 45.
(ClO3)- name
Explanation
The correct answer for the given question is "Chlorate." Chlorate is the name of the (ClO3)- ion. It is an anion that consists of one chlorine atom bonded to three oxygen atoms. The -ate suffix indicates that the chlorine atom is in its highest oxidation state, which is +5 in this case. Chlorate ions are commonly found in compounds such as sodium chlorate (NaClO3) and potassium chlorate (KClO3).Rate this question:
- 46.
(ClO4)- name
Explanation
The correct answer is "Perchlorate" because the given chemical formula (ClO4)- corresponds to the perchlorate ion. Perchlorate is an anion composed of one chlorine atom bonded to four oxygen atoms. It is commonly used in the production of fireworks, explosives, and rocket propellants.Rate this question:
- 47.
(C2H3O2)- name
Explanation
The correct answer is Acetate. Acetate is the name for the (C2H3O2)- ion. It is derived from acetic acid, which is a weak acid commonly found in vinegar. Acetate ions are often used in various chemical reactions and are also present in many organic compounds. Therefore, the correct name for the (C2H3O2)- ion is Acetate.Rate this question:
- 48.
(MnO4)- name
Explanation
Permanganate is the correct answer because it is the name of the (MnO4)- ion. The "-ate" suffix indicates that the ion has a negative charge, and "permanganate" specifically refers to the MnO4- ion. This ion is commonly used in redox reactions and is a strong oxidizing agent.Rate this question:
- 49.
(C2O4)2- name
Explanation
The correct answer for the given question is "Oxalate". Oxalate is the name of the (C2O4)2- ion. It is a polyatomic ion that consists of two carbon atoms and four oxygen atoms. The name "oxalate" is derived from the organic compound oxalic acid, which is the precursor for this ion. The (C2O4)2- ion has a -2 charge and is commonly found in various salts and compounds.Rate this question:
- 50.
(O2)2- name
Explanation
The given correct answer for the question is "Peroxide". This is because the name "peroxide" is commonly used to refer to the O2- ion. The O2- ion consists of two oxygen atoms bonded together with a -2 charge, and it is commonly found in compounds such as hydrogen peroxide (H2O2) and sodium peroxide (Na2O2). Therefore, "peroxide" is the appropriate name for the O2- ion.Rate this question:
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