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Tags: Question 24 . 30 seconds . 2 Answers. a.) Changing subscripts changes the ratios of atoms in the molecule and the resulting chemical properties. • The stable compound is PC1 3 i.e., BC 3. c.A molecular formula gives the exact number of atoms of each element in a molecule. Advertisement Remove all ads. d.) Na + O2 = 2 NaO. E. Among the elements, there are more metals than non-metals. 17. Mark all that are correct. 2 Na + O2 = Na2O. An ionic bond should have a … The bond between B and C will be (i) Ionic (ii) Covalent (iii) Hydrogen (iv) Coordinate Solution: Option (ii) is the answer. A)CH4 B)CO2 C)N2 D)NH3 30.Which formula represents an asymmetrical molecule? In molecular formulae, the elements are denoted by their respective symbols (as in the periodic table) and the number of atoms of each element in the molecule is written in subscript. (a) NaSO 4 (b) CaPO 4 (c) ZnS (d) AlSO 4. For example, hydrogen and oxygen exist as two-atom molecules. which of the following statements regarding empirical formulas molecular formulas and percent composition is correct? Two Compounds having different percent compositions of the same two elements are not the same compound. (1 point)The molecule is composed of four atoms.The molecule contains oxygen atoms.The molecule is water.The molecule represents an element. C. The bonding in compounds may be covalent or ionic. Log in. 1. I'm positive that C and D are correct… Concept Notes & Videos 256. -the formula/molecular mass is given by the sum of the masses of the component elements in the correct proportions -the atomic mass of a cation or anion Is practically the same as the mass of the neutral element 18. Problem 6 Explain the following statement: The smallest particles unique to a compound cannot be atoms. When two nonmetallic elements form a molecular compound, several combination ratios are often possible. You may need to download version 2.0 now from the Chrome Web Store. The only incorrect option is B. Question Bank Solutions 15292. For example- the molecular formula for glucose is C 6 H 12 O 6. Note from the example that there are some standard rules to follow in writing molecular formulas. By following the rules of nomenclature, each and every compound has its own unique name, and each name refers to one and only one compound. Which of the following statements regarding empirical formulas, molecular. • Question 5. … For example, carbon and oxygen can form the compounds CO and CO 2.Since these are different substances with different properties, they cannot both have the same name (they cannot both be called carbon oxide). A molecular formula is a chemical formula of a molecular compound that shows the kinds and numbers of atoms present in a molecule of the compound. Important Solutions 3. Advertisement Remove all ads. -the formula/molecular mass is given by the sum of the masses of the component elements in the correct proportions-the atomic mass of a cation or anion Is practically the same as the mass of the neutral element . Sulfuric acid is one of the most widely produced chemicals in the United States and is composed of the elements hydrogen, sulfur, and oxygen. Which of the following order of energies of molecular orbitals of N2 is correct? OH. which of the following statements regarding empirical formulas molecular formulas and percent composition is correct? Which of the following formulas represents a molecular compound? Explain how to write a formula for an ionic compound given the names of the metal and nonmetal (or polyatomic ion) in the compound. B. Since both rhombic and monoclinic are nonpolar in nature so, they are soluble in non-polar solvents like carbon disulphide (C S 2. . e. At least two of the above statements (A-D) are false. 2. Log in. elements present in the compound and what is the number of atoms of one element that combine with a definite number of atoms of the other element. Use the following figure to answer questions 14 - 15 14. Zn 2+ and S 2-. Reason (R) : The empirical formula represents the simplest whole number ratio of various atoms present in a compound. The balanced chemical equation for the combustion of methane is: CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) Which of the following statements concerning this chemical equation is/are correct? a) C 7 H 10 O b) C 7 H 12 O c) C 6 H 8 O d) C 6 H 10 O Question 10 Which is the correct molecular formula of the following molecule? NH 3 . The molar mass of a molecular substance is the mass per moles of its molecules. Q17. Ahmed A. Numerade Educator 00:51. 17. What is the chemical formula for ammonium sulfate? (b) Elements in a period have similar chemical properties. One molecule of hydrogen element contains two atoms of hydrogen, therefore, the formula of hydrogen is H 2. The atomic mass of a cation or anion is practically the same as the mass of the neutral element. 103 0 obj <>/Filter/FlateDecode/ID[<53E74EA71B1E58499F08DD4F0185BE43>]/Index[79 65]/Info 78 0 R/Length 111/Prev 156739/Root 80 0 R/Size 144/Type/XRef/W[1 2 1]>>stream Yu��kR��q�.�#8���%i����J�1��:�4�DV+]g`�� �! Can the relative amounts of the … Correct the Following Statement: a Molecular Formula Represents an Element. 1) barium oxide (Ba and O) Formula: 2) caleium chloride (Ca and Cl) Cc Formula: valence e- 3) aluminum oxide (Al and O) Formula. Which of the Following Represents a Correct Chemical Formula ? 1. Calculate the formula mass of sodium carbonate (Na 2 CO 3.10H 2 O). Empirical formulas represent the lowest ratio of coefficients in a chemical formula. 3. Concept Notes & Videos 256. (e) react vigorously with one another. Trevor H. Lv 7. The molecular formula for a compound can be the same as or a multiple of the compound’s empirical formula. 8 years ago. a) the formula mass of that substance expressed in atomic mass units. (d) It is incorrect. What is the correct chemical formula for methane? The correct statement is : Question 34. Performance & security by Cloudflare, Please complete the security check to access. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Both rhombic and monoclinic sulphur has the molecular formula S 8. . 0 Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.. Which of the following represents the correct chemical formula ? Options. Cloudflare Ray ID: 63295bc289b52be9 Those that come with opposite charge can be held together strongly within the compound. Abond order of O represents a stable chemical bond. h�bbd``b`v�@�����r��! B. D. The molecular formula of a compound provides more information than the structural formula. thank you in advance. As with any molecule, these elements are labeled with a molecular formula, a formal listing of what and how many atoms are in a molecule. asked Oct 16, 2020 in Chemistry by Kaanta ( 53.9k points) d.A molecular formula uniquely describes a molecule. Tags: Question 25 . Correct the Following Statement: a Molecular Formula Represents an Element. Some elements exist naturally as molecules. (a) C 7 H 16 (b) C 6 H 14 (c) C 5 H 10 (d) C 4 H 8 (e) C 3 H 8. Lead (IV) Chloride. Find an answer to your question Choose the correct equation to represent the following statement (unbalanced chemical equation): Aluminum reacts with hydrochlor… 1083366mj 1083366mj 01/30/2017 Chemistry High School Choose the correct equation to represent the following statement (unbalanced chemical equation): Aluminum reacts with hydrochloric acid to yield aluminum chloride and hydrogen. A bonding molecular orbital has more energy than the original atomic orbitals. copper(I) sulfate Express your answer as a chemical formula. Q18. Solution : False. Answer : The correct option is, It is the simplest ratio of atoms in a formula unit. The electronic configuration of the outermost shell of the most electronegative element is (a) 2s22p5 The periodic table can be used to calculate the molar mass of any substance. Question Papers 10. What is the atomic … Choose the correct option out of the choices given below each question. MCQ. The nucleus of an atom contains or is made up of which of the following? (c) have the same molecular formula. Ammonia is a compound of nitrogen and hydrogen as shown below: Figure \(\PageIndex{1}\): The molecular formula for ammonia. Use subscripts to represent… - Science. A. �W$�� �� V"HD0Ɓd���|@��d�n�D4��z$�N �L�y� ٻ ����,3#�=��q�����0 �I� Atoms are the smallest particles of an element that retain the element's chemical properties. In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. The chemical formula for water is \(\ce{H_2O}\). - A compound is a type of pure substance and has properties different from those of its component elements. Q. One gram of methane gas reacts with two grams of dioxygen gas, producing one gram of carbon dioxide gas and two grams of gaseous water. e) no correct response. A. A102 B. A1203 C. A1302 D. A1306 6. h�b```f``*c`e`�cd@ A�(�F�9�[�]�/�` The chemical formula of a compound is the same for all the molecules of that compound. D. An empirical formula must be multiplied by an integer to obtain the molecular formula. Fe (iron) is an element that is represented with no subscript, so it is an atomic element. Syllabus. Join now. The molecular formula of the compound formed from B and C will be (i) BC (ii) B 2 C (iii) BC 2 (iv) BC 3 Solution: Option (iv) is the answer. "TA#�`ˈ�I4��@��)PH��8X$���YM�GDZ�C����ؤxXx�. An empirical formula represent a molecule. a. What is the correct chemical equation for the following statement? All of the statements are true The subscripts represent the relative number of each type of atom in the t compounds made of the same elements have different subscripts y of each type of atoms are there in the formula NHaC2H3O2? Add your answer and earn points. 1. Other elements also exist naturally as diatomic molecules —a molecule with only two ato ms (Table \(\PageIndex{1}\)). Solutions are always homogeneous mixtures. Which of the following options represents the correct bond order? An atom is the (a) smallest particle of matter known (b) smallest particle of a gas (c) smallest particle of an element that can take part in a chemical change (d) radioactive emission H 2 0. The empirical formula and molecular formula of a given compound are always the same. (d) have a different content of the isotopes of hydrogen. 1. Problem 7 Can the relative amounts of the components of a mixture vary? Correct the following statement a molecular formula represent an element Get the answers you need, now! (i) Write the chemical formula of its phosphide. The percent of carbon in this compound is correctly expressed as. Which of the following statements is/are CORRECT? Sample A contains one gram molecules of oxygen molecules and sample B contains one mole of oxygen molecules. - … 143 0 obj <>stream consider the formula for the ionic compound Na2O. Which of the following represents a correct chemical formula ? The molar mass of CH2Cl2 is 85.0 g/mol, wile the molar mass of carbon is 12.0 g/mol. (c) Elements can be classified as either metalloids or nonmetals. The empirical formula and molecular formula of a given compound are always the same. Write the correct chemical formula for the ionic compound that forms. Some elements exist naturally as molecules. Some elements exist as molecules. The terms “atom” and “element” can have different m eanings. Define and provide an example for each of the following: atomic element, molecular element, ionic compound, molecular compound. answer choices . It is represented by the formula H 2 O . A)H + H H2 + energy B)H + H + energy H2 C)H2 H + H + energy D)H2 + energy H + H 29.Which equation represents energy being absorbed as a bond is broken? Relevance. (iii) A is false but R is true. Please enable Cookies and reload the page. One Line Answer. B. an empirical formula gives the smallest whole number ratio of each type of atom in a MOLECULE. Explanation : Empirical formula : It is the simplest form of the chemical formula which depicts the whole number of atoms of each element present in the compound. Right now, you want to know which of the given compounds is an ionic compound. Ask your question. A)ZnO. - Chemistry. In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. D. Data on the percent composition of the elements … Solution Show Solution. When we read the formula, the subscripts tell us how many atoms of a particular element is in one molecule of that compound: When we write H 2 O, we actually mean H 2 O 1. Syllabus. 2 Answers. Explain the following statement: The smallest particles unique to an element may be atoms or molecules. Chemical formula of element – O 2 for hydrogen e." N.1,H-4, C = 2,0.2 e. None of the above 3. endstream endobj startxref A. The molecular formula provides insight into the number of elements present in a compound. What is meant by a chemical formula? The compounds may do ionic or covalent bonding. ). B. Chapter 4 which deals with the topic of chemical bonds and molecular structure is included in the class 11 chemistry textbook to help students develop a clear approach to chemical bonding. (iv) Both A and R are false. A molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule. CH 4. This compound is a solid having a high melting point. C. In a formula such as Ca(NO3)2, all the numbers of atoms inside the parentheses must be multiplied by 2 because of the subscript 2. Identify the cations and anions in the following compounds : (a) CH 3 COONa (b) NH 3 (c) NH 4 Cl (d) SrCl 2. NaSO4. 32. Problem 53 Ahmed A. Numerade Educator 02:38. PCl 3 is made up of two nonmetals, so it is a molecular compound. We must always write whether hydrogen is in atomic form or molecular form. Select the incorrect statement about elements and compounds. The molecular formula of the compound formed from B and C will be (a) BC (b) B 2 C (c) BC 2 (d) BC 3 Sol: (d) B represent P and C represents Cl. You cannot change subscripts in a chemical formula to balance a chemical equation; you can change only the coefficients. c.) Na2O + O2 = 2 Na . An ionic compound is composed of ions that may have a positive or negative charge. 39. Assertion (A) : The empirical mass of ethene is half of its molecular mass. 6.23 e A mole of a chemical substance represents. Which of the Following Represents a Correct Chemical Formula ? Assertion (A) : The empirical mass of ethene is half of its molecular mass. - A compound is described by a chemical formula that includes the symbols for the elements that make up the compound. (ii) A is true but R is false. formulas, and percent composition is correct? Electrons placed in antibonding orbitals stabilize the lon/molecule. c. Elements can exist as atoms or molecules. For example, hydrogen and oxygen exist as two-atom molecules. Reason (R) : The empirical formula represents … Compounds Composed of Two Elements. 30 seconds . Water is composed of hydrogen and oxygen in a 2:1 ratio. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. B. - A compound is a substance composed of two or more elements combined in definite proportions. Correct the Following Statement: a Molecular Formula Represents an Element. … The empirical formula represents the simplest whole-integer ratio of atoms in a compound. SURVEY . You have to know what a chemical compound is : … What is the chemical formula for this compound? a.A molecular formula gives a more complete picture of a molecule than does an empirical formula. The chemical formula of an element is a statement of the composition of its molecule in which symbol tells us the element and the subscript tells us how many atoms are present in one molecule. Other elements also exist naturally as diatomic molecules —a molecule with only two ato ms (Table \(\PageIndex{1}\)). A. NH4S04 D. (NH4)2S04 4. Textbook Solutions 8950. Assertion (A) : The empirical mass of ethene is half of its molecular mass. Here students have to examine the formation of different types of bonds like a covalent bond or hydrogen bond understand different rules and theories as well as hybridisation. Advertisement Remove all ads. Update: u only have 1 correct answer. B)Xe. Here, we will start with relatively simple molecules that have only two elements in them, the so-called binary compounds: Identify the elements in the molecule from its formula. %PDF-1.6 %���� Actual mass of a molecule is obtained by dividing the molar mass by Avogadro’s number whereas gram molecular mass represents the molecular mass expressed in grams, i.e., it is the mass of 1 mole of molecules, i.e., Avogadro’s number of molecules. Favourite answer. The name of the compound is zinc sulphide. A. please answer the question and justify all the chooses and tell me why its wrong and why its right. answer choices NH 3 . 38. Lv 7. CISCE ICSE Class 9. 3. b.A molecular formula provides a well-defined ratio for the different atoms in a molecule. 2. Answer Save. One Line Answer. A)HI B)HBr C)HF D)HCl 31.Which compound … Lead (I) Chloride. Colin. What is an atom that has a positive charge called? Lastly, which of the following statement about empirical formulas is incorrect? What is the correct chemical formula for ammonia? b) Avogadro’s number of grams of that substance. According to convention, we do not use 1 as subscript in formulae and so the first formula is the correct one. The molecular formula of the chloride of an element X is XCl. What is the most commonly used temperature scale in the scientific community? If false, correct the statement to make it true: (a) The nucleus has most of the mass and comprises most of the volume of an atom. A. C)SO2. (b) The statement is not correct. 2. Provide the classification (i.e. For example, a molecule of water contains two hydrogen atoms and one oxygen atom. 1. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Which among the following elements does NOT exist as a diatomic molecule in nature? a) C 3 H 7 NO b) C 3 H 8 NO c) C 4 H 9 NO d) C 4 H 10 NO Question 11 Which set of approximate bond angles at C1, C2, and C3 of the following molecule indicates the correct shape? Correct each of the following statements: (a) In the modern periodic table, the elements are arranged in order of increasing atomic mass. CaCl. The correct name for the compound given below is: (a) 2-methyl-1-butene (b) 2-ethyl-1-propene (c) 2-ethyl-1-pentane (d) 3-methyl-2-butene (e) pentene 9. If you know what I mean ..... Answer Save. Both the ions are divalent i.e. Chemical formulae of elements. Ahmed A. Numerade Educator 01:53. CBSE CBSE Class 9. Reason (R) : The empirical formula represents … What is the difference between an empirical formula and a molecular formula? Two Compounds having different percent compositions of the same two elements are not the same compound. Two compounds having different percent compositions of the same two elements are not the same compound. The empirical formula and molecular formula of a given compound are always the same. Another way to prevent getting this page in the future is to use Privacy Pass. atomic element, molecular element, molecular compound, or ionic compound) of each substance. Question 6: What is wrong with the following chemical equation ? Ahmed A. Numerade Educator 02:32. C. The empirical formula and molecular formula of a given compound are never the same. Important Solutions 3. Which of the following statements is TRUE? Which of the following hydrocarbons does not have isomers? Extending this symbolism to represent both the identities and the relative quantities of substances undergoing a chemical (or physical) change involves writing and balancing a chemical equation. b. 38. Molecular Formula. Which of the following statements is false? Na2O = 2 Na + O2 . chem lithium nitride. (i) Write the chemical formula of its phosphide. State whether the following statement is true or false : A chemical equation can be balanced easily by altering the formula of a reactant or product. NaS. - Chemistry. Solution for Enter the correct formula for the following compounds. CISCE ICSE Class 9. The correct order of energies of molecular orbitals in N2 molecule is. HESI A2 CHEMISTRY FILES Revision Question with top Rated Answers 2021 | What are all metric measurements composed of? Correct the Following Statement: a Molecular Formula Represents an Element. An element X has a valency 1. Solution: A chemical formula represents the composition of a molecule of the substance in terms of the symbols of the elements present in the molecule. Answer: (a) CH 3 COO –, Na + Fe; PCl 3; LiBr; P 4; oxygen gas; Solution. OH. Choose the correct option out of the choices given below each question. answer choices . b.) Relevance. A lot of compounds are usually composed of two elements. A. In the periodic table, what are the rows called? All ionic compounds are neutral B. c) the mass of that substance that will combine with 1.00 gram of carbon. Which of the following elements be present in the same group as X. C. The molecular formula can be the same as the empirical formula in some situations. which is the correct name of the ionic compound Li3N. A(n) _____ is made up . d. Compounds can exist as atoms or molecules. Select the best name for: (a) 4-ethyl-cis-3-octene (b) 4-ethyl-trans-3-octene (c) 4-butyl-cis-3-hexene (d) 5-ethyl-trans-5-octene (e) 5-ethyl-cis-5-octene 10. Q. (b) Every atom of a given element has the same number of protons. A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements. 28.Which statement describes the energy changes that occur as bonds are broken and formed during a chemical reaction? 85.o g CH2Cl2. Consider as an example the reaction between one methane molecule (CH 4 ) and two diatomic oxygen molecules (O 2 ) to produce one carbon dioxide molecule (CO 2 ) and two water molecules (H 2 O). Lead Chloride. d) more than one correct response. (i) Both A and R are true and R is the correct explanation of A. What is the … In order to represent the chemical formula of compound, one must know what are the . As with any molecule, these elements are labeled with a molecular formula, a formal listing of what and how many atoms are in a molecule. Determine whether each of the following statements is true or false. It is also known as molecular formula. Question Bank Solutions 15292. Which statement is true about the following molecule? SURVEY . Na3N. What is the correct formula for aluminum oxide? For example, water (H 2 O) and hydrogen peroxide (H 2 O 2) are chemically distinct substances. %%EOF Textbook Solutions 19009. Hence, the correct options are A, C and D. Q21. T mole of hydrogen atoms or one mole of hydrogen molecules. Q20. Which of the following is the correct name for PbCl 4? Molecular formula represents the actual number of atoms of different elements present in one molecule of the compound.

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