Chemical Bonds & Formulas After School Regents Review
Chemical Bonds & Formulas After School Regents Review Practice1. Ice, H 2O(s), is classified asA)B)C)D)an ionic compounda molecular compounda homogeneous mixturea heterogeneous mixture2. Which two particle diagrams each represent a sampleof one substance?3. Which sample of matter represents a mixture?A) aqueous ammonia B) gaseous ethaneC) liquid mercuryD) solid iodine4. A compound is a substance composed of two or moreelements that areA)B)C)D)physically mixed in a fixed proportionphysically mixed in a variable proportionchemically combined in a fixed proportionchemically combined in a variable proportion5. Which change is most likely to occur when amolecule of H 2 and a molecule of I 2 collide withproper orientation and sufficient energy?A) a chemical change, because a compound isformedB) a chemical change, because an element is formedC) a physical change, because a compound isformedD) a physical change, because an element is formed6. What is the chemical formula for ammonium sulfide?A) (NH 4) 2SC) (NH 4) 2SO 4B) (NH 4) 2SO 3D) (NH 4) 2S2O37. What is the chemical formula for sodium sulfate?A) Na2SO 4C) NaSO 4B) Na2SO 3D) NaSO 38. What is the chemical formula for lead(IV) oxide?A) PbO 2 B) PbO 4 C) Pb2O D) Pb4O9. Which group on the Periodic Table of the Elementscontains elements that react with oxygen to formcompounds with the general formula X 20?A) Group 1C) Group 14B) Group 2D) Group 1810. What is the total number of different elementspresent in?A) 7B) 9C) 3D) 411. What is the chemical formula of titanium(II) oxide?A) TiOC) TiO2A) I and IIC) II and IIIB) I and IIID) II and IVB) Ti2OD) Ti2O3
Chemical Bonds & Formulas After School Regents Review Practice12. Given the key:15. Which diatomic molecule is formed when the twoatoms share six electrons?A) H2B) N2C) O2D) F216. Given the formula for hydrazine:Which particle model diagram represents a chemicalchange?A)How many pairs of electrons are shared between thetwo nitrogen atoms?B)A) 1C)C) 3D) 417. Which atom in the ground state has a stable valenceelectron configuration?D)A) Ar13. Given the equation representing a reaction:O O O2Which statement describes the changes that occur asthe oxygen molecule is produced?A)B)C)D)B) 2Energy is absorbed as bonds are broken.Energy is absorbed as bonds are formed.Energy is released as bonds are broken.Energy is released as bonds are formed.14. Given the balanced equation representing a reaction:H2 energyH HWhat occurs as bonds are broken in one mole of H2molecules during this reaction?A) Energy is absorbed and one mole of unbondedhydrogen atoms is produced.B) Energy is absorbed and two moles ofunbonded hydrogen atoms are produced.C) Energy is released and one mole of unbondedhydrogen atoms is produced.D) Energy is released and two moles of unbondedhydrogen atoms are produced.B) AlC) SiD) Na18. Which property is used to determine the degree ofpolarity between two bonded atoms?A) densityC) pressureB) electronegativityD) temperature19. What is the most likely electronegativity value for ametallic element?A) 1.3B) 2.7C) 3.4D) 4.020. Which term refers to how strongly an atom of anelement attracts electrons in a chemical bond with anatom of a different element?A)B)C)D)entropyelectronegativityactivation energyfirst ionization energy21. What occurs when potassium reacts with chlorine toform potassium chloride?A) Electrons are shared and the bonding is ionic.B) Electrons are shared and the bonding iscovalent.C) Electrons are transferred and the bonding isionic.D) Electrons are transferred and the bonding iscovalent.
Chemical Bonds & Formulas After School Regents Review Practice22. Which element reacts with oxygen to form ionicbonds?A) calciumC) chlorine26. The particle diagram below represents a solid sampleof silver.B) hydrogenD) nitrogen23. The table below shows properties of two compoundsat standard pressure.Which type of bonding is present when valenceelectrons move within the sample?A) Metallic bonding B) hydrogen bondingC) covalent bonding D) ionic bondingWhich statement classifies the two compounds?A) Both compounds are ionic.B) Both compounds are molecular.C) Compound 1 is ionic, and compound 2 ismolecular.D) Compound 1 is molecular, and compound 2 isionic.24. Which statement describes a multiple covalentbond?A)B)C)D)Two electrons are shared.Four electrons are shared.Two electrons are transferred.Four electrons are transferred.25. A molecular compound is formed when a chemicalreaction occurs between atoms ofA)B)C)D)chlorine and sodiumchlorine and yttriumoxygen and hydrogenoxygen and magnesium27. Which type of bonding is present in a sample of anelement that is malleable?A) ionicB) metallicC) nonpolar covalent D) polar covalent28. Which bond is most polar?A) C–O B) H–O C) N–O D) S–O29. Which formula represents a nonpolar moleculecontaining polar covalent bonds?A)B)C)D)30. Which molecule has a nonpolar covalent bond?A)B)C)D)31. Which phrase describes the molecular polarity anddistribution of charge in a molecule of carbondioxide, CO 2?A)B)C)D)polar and symmetricalpolar and asymmetricalnonpolar and symmetricalnonpolar and asymmetrical
Chemical Bonds & Formulas After School Regents Review Practice32. Given the formula representing a molecule:Which statement explains why the molecule isnonpolar?A) Electrons are shared between the carbon atomsand the hydrogen atoms.B) Electrons are transferred from the carbon atomsto the hydrogen atoms.C) The distribution of charge in the molecule issymmetricalD) The distribution of charge in the molecule isasymmetrical.33. A molecule must be nonpolar if the moleculeA)B)C)D)is linearis neutralhas ionic and covalent bondinghas a symmetrical charge distributionBase your answers to questions 34 through 36 on the information below and on your knowledge ofchemistryThe equation below represents a chemical reaction at 1 atm and 298 K.34. Compare the strength of attraction for electrons by a hydrogen atom to the strength of attraction forelectrons by an oxygen atom within a water molecule.35. Draw a Lewis electron-dot diagram for a water molecule.36. State the change in energy that occurs in order to break the bonds in the hydrogen molecules.
Answer KeyReview Chemical C24.B25.C26.A27.B28.B29.B30.A31.C32.C33.D34.— The oxygen atomhas a strongerattraction forelectrons than ahydrogen atom. —Theelectronegativity ofoxygen is 3.4 andhydrogen is 2.2. —The H atom has aweaker attraction forelectrons.35.36.— Energy isabsorbed whenbonds are broken. —Breaking the bond inH2 is endothermic,— PE increases.
A)Metallic bonding B)hydrogen bonding C)covalent bonding D)ionic bonding 26.The particle diagram below represents a solid sample of silver. Which type of bonding is present when valence electrons move within the sample? A)ionic B)metallic C)nonpolar covalent D)polar covalent 27.Which type of bonding is present in a sample of an element that is .
Chemical Formulas and Equations continued How Are Chemical Formulas Used to Write Chemical Equations? Scientists use chemical equations to describe reac-tions. A chemical equation uses chemical symbols and formulas as a short way to show what happens in a chemical reaction. A chemical equation shows that atoms are only rearranged in a chemical .
Bonds written by an insurance company for construction projects are referred to as contract surety bonds. The main types of contract surety bonds are: bid bonds, performance bonds, payment bonds, and warranty bonds (sometimes called maintenance bonds).The two basic functions of these bonds are: Prequalification—assurance that the bonded
public safety as are secured bonds. Unsecured bonds are as effective at achieving court appearance as are secured bonds. Unsecured bonds free up more jail beds than do secured bonds because: (a) more defendants with unsecured bonds post their bonds; and (b) defendants with unsecured bonds have faster release-from-jail times.
3. VALUATION OF Bonds AND Stock Objectives: After reading his chapter, you will 1. Understand the role of bonds in financial markets. 2. Distinguish between different types of bonds, such as zero-coupon, perpetual, discount, convertible, and junk bonds and apply the bond pricing formulas to evaluate these bonds. 3.
Writing Chemical Formulas and Chemical Reactions Chemical Formula Chemical formulas are a useful way to convey information about a compound such as: ¾ What elements make up the compound ¾ The ratio or number of atoms in the compound The chemical formula has different meanings depending on the type of intramolecular forces holding
Construction Bonds Guide I. INTRODUCTION This guide explains and provides practical advice on bid bonds, performance bonds, labour & material bonds, and construction lien bonds – collectively referred to in this guide as construction bonds. Understanding the general concepts
of bonds in a compound determines many of its properties. Three types of bonds are ionic, covalent, and metallic bonds. An ionic bond is the force of attraction that holds together oppositely charged ions. Ionic bonds form crystals. Table salt contains ionic bonds. A covalent bond is the force of
Distinguish between chemical formulas, molecular formulas, and formula units. 4. Know the charges of the formulas for monatomic ions using the periodic table. Chapter 9 & 10 5. Be familiar with the charges and the formulas for polyatomic ions. 6. Apply the rules for naming and writing formulas for binary and ternary ionic compounds. 7.
