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Compounds

In chemistry, a compound is a pure chemical substance made up of two or more different elements. For example, molecular hydrogen with chemical formula H2 is not considered a compound as it is composed of only one type of element: hydrogen. However, water with chemical formula H2O is considered a compound as it is made of two parts hydrogen and one part oxygen. Thus, all compounds are molecules, but not all molecules are compounds.

In terms of bonding, compounds are formed when two or more atoms are joined chemically, meaning a defined chemical bond is present between linked atoms. This differentiates a compound from a mixture, which is just a substance made by combining two or more different elements in such a way that no chemical reaction occurs. Thus, compounds can usually be separated into its constituting atoms by chemical reactions, while mixtures do not have this ability.

Structurally, since compounds have a fixed ratio of atoms, their spatial arrangement of bonds and atoms are well-defined. They can vary not only on the type of composing atoms, but also on the type of bonds holding the compound together. As with molecules, compounds can be held together by covalent bonds, ionic bonds, metallic bonds, and coordinate covalent bonds. Thus, understanding the nature of compounds is essential for constructing a conceptual framework needed to understand chemical composition.

Titration: reaction and yield

What volume of 15.7 M HNO3 is needed to prepare 0.500 L of 2.00 M HNO3? Please provide detailed explanation An experiment reacts 2.50 g of aniline C6H7N, with 4.00 mL of acetic anhydride C4H6O3 (density=1.082 g/mL), and produces 2.92 g of acetanilide, C8H9NO. Calculate the theoretical yield and the percentage yield of acetani

Titration, solution content and molarity

An experiment calls for using 20 mL of toluene. (density=0.8668 g/mL, molecular weight=92.139 g/mol). What mass of toluene, and how many moles are involved? An experiment calls for 50.0 of benzoyl chloride to be used (density=1.212 g/mL). What volume of benzoyl chloride is needed? An aqueous solution of nitric acid has a

Chemistry: Compound Composition

Please discuss how to find the molar mass of a compound, percent composition of the elements of a compound and how to determine the empirical and molecular formulas from percent composition.

Heating aluminum and changes in combustion

1. Aluminum has a specific heat of 0.880 J/g-deg. How many joules are needed to heat 155g of Al from 20.0oC to 75.0oC 2. Characterize each of the following as saturated, unsaturated, or unable to exist.Give reasons for your answers. A. C5H12 B. C3H2 C. C8H20 D. C2H2 E. CH3 3. The ∆H of

Chemistry Reaction and Concepts

I need some help answering these questions. 1. A.What is the mass in grams of 2.75 moles of CH4 ? B. How many moles are in 365 grams of K2SO4 ? 2. Using the bond energies below determine the value and sign of delta H for the reaction: 2H-H + O=O → 2H-O-H

Type I, II and III Compound Names for Chemistry Students

Name Type I Compounds: Rb2O Cd3(PO3)2 Ca(HCO3)2 Name Type II Compounds Co(C2H2O2)3 Pb(ClO3)2 Name Compounds Type I, II, or III Co2(HPO3)3 Provide the Formulas of Type I Compounds Magnesium iodite Silver Sulfite Beryllium hydroxide Potassium permanganate Aluminum telleride Provide the Formulas for Type II C

Assistance with drawing structural formulas

1) Draw structural formulas for all of the structural isomers of C4H10 (there are two) 2) Draw structural formulas for all of the structural isomers of C5H12 (there are three) 3) Draw structural formulas for all of the structural isomers of C3H7Cl 4) Draw structural formulas for all of the isomers of C4H8 (there are six

Chemist Symbolism

Chemists use symbolism to facilitate writing of chemical equations. Briefly explain the difference between 1) CuSO (s) and CuSO . 5H O(S) 4 4 2 2) CuSO (s) and CuSO (aq) 4 4 3) CuSO . 5H O(s) and CuSO (aq) 4 2 4

NOMENCLATURE

Name these substances: a) (CU(Cl4)^2- b) Ag(NH3)2^+ c) Cu(NH3)4 SO4 d)Al(H2O)6 Cl3

Solid slowly added to solution, which precipitates first

Solid NaI is slowly added to a solution that is 0.013 M in Cu+ and 0.013 M in Ag+. Which compound will begin to precipitate first? Compound with greater or smaller Ksp How do you calculate [Ag+] when CuI just begins to precipitate. What percent of Ag+ remains in solution at this point?