Chapter 6: Chemical Composition
Section 6 5: Percent Composition of Compounds •Sometimes it is not enough to know a compound’s composition in terms of numbers of atoms; it may also be useful to know its composition in terms of the massesof its elements •We can calculate the mass fraction by dividing the mass of a given elementin one mole of a compound by the mass of one
Chapter 6: Chemical Composition
1 dozen carbon atoms = _____ carbon atoms 1 dozen eggs = _____ eggs 1 dozen donuts = _____ donuts Two ways of specifying quantity: 1) Mass 2) Number Your coworker brought in 42 donuts How many dozen donuts did she bring to share? The counting unit used in chemistry is the MOLE (mol) 1 Mole = 6 022 x 1O 23 of Anything
Chapter 8 Chemical Composition
Atomic Masses: Counting Atoms by Weighing Average Atomic Mass for Carbon • Even though natural carbon does not contain a single atom with mass 12 01, for our purposes, we can treat carbon as though it is composed of only one type of atom with a mass of 12 01 • This enables us to count atoms of natural carbon by weighing a sample of carbon
A Introduction to Chemistry, Atoms and Elements
Atoms come together to form compounds and compounds can break apart into atoms or be combined to form new compounds Main areas of Chemistry: Organic – compounds of carbon (some exceptions CO2 CO considered inorganic) Inorganic – compounds that do not include carbon Analytical – composition of matter and mixtures (what is there and how much)
Quantitative Composition of Compounds
Composition Usually made up of nonmetal atoms Held together by covalent bonds Types of Formulas Empirical Molecular Structural CH3 C2H6 C H H H C H H H Atomic and
Composition of Atoms: The Sub-atomic Particles
Answers to Composition of Atoms: The Sub-atomic Particles 1 Write complete definitions for each of the following terms Include one additional piece of information such as an example or application: a) Atomic number: the number of protons in the nucleus of an atom This determines what type of atom (element) it is
Percent composition (mass percent, percent composition by mass)
Mass composition of: 75 7 C, 8 8 H, and 15 5 O yielded these molar ratios 6 30 mol C : 8 7 mol H : 0 969 mol O, which is the same as saying 6 30 atoms C : 8 7 atoms H : 0 969 atoms O Atoms do not combine as fractions or pieces (0 30, 0 7, 0 969), so we must scale up to reach whole atoms (whole numbers)
1 Composition of air
Since 6 022x1023 atoms of 12C (each with a mass of 12 amu) have a mass of 12 grams, then (6 022x1023 atoms) (12 amu/atom) = 12 g 6 022x1023 amu = 1 g or 1 amu = 1 66x10-24 g The mass of one mole, mg of the element is equal to its atomic mass in grams Example: the mass of 1 mole of H (hydrogen) atoms is 1 008 g because hydrogen atomic mass is
[PDF] LE SOL, UN MILIEU VIVANT I Observation du sol : II Les
[PDF] Les types de peintures et leurs applications - Bruxelles Environnement
[PDF] Données sur la composition des aliments - Food and Agriculture
[PDF] Chapitre 11-Structure et composition chimique de la Terre interne
[PDF] Stabilité des huiles alimentaires au cours de leur stockage
[PDF] Composition chimique de roches magmatiques
[PDF] Constitution de la Republique Algerienne Democratique et popu
[PDF] Triticum aestivum L - Tel archives ouvertes - Hal
[PDF] composition d 'un noyau - archimede
[PDF] Le noyau cellulaire - L 'UNF3S en 2015, c 'est
[PDF] Le sol et ses constituants - Unifa
[PDF] LE SOL, UN MILIEU VIVANT I Observation du sol : II Les
[PDF] SVT 6ème
[PDF] EU Brésil ADongeux