Elements in compounds are present in characteristic and definite proportions

Elements in compounds are present in characteristic

This preview shows page 1 - 3 out of 4 pages.

Elements in compounds are present in characteristic and definite proportions Law of Constant Composition: every sample in a compound always contains the same elements combined in the same proportions
Image of page 1
1.2: Atom: smallest particle of an element that retains the chemical characteristics of the element Aka elements are made of particles called atoms Compounds are made of molecules Molecule: collection of atoms chemically bonded together in characteristic proportions Chemical Formula: notation for representing elements and compounds(symbols for elements and subscript for number of atoms of the element in molecule) ex.. H 2 O Chemical Equation: notation in which chemical formulas are expressed(coefficient quantities of substance) ex. 2H 2 +O 2 —> H 2 O Chemical Formulas tell us the proportions of elements in a compound but not how atoms of those elements are connected or the shape of the molecules Chemical Bonds: the energy that holds two atoms in a molecule together Structural Formula: shows the atoms and bonds in a molecule Ball and Stick Model: spheres represent atoms and sticks the chemical bonds, pros: show the correct angle between bonds, cons: relative sizes of spheres are not accurate to the atoms size, and the atoms aren’t touching due to the sticks Space filling model: these disadvantages are overcome, by spheres drawn to scale and next to one another, cons: bond angles may be hard to see 1.3: How to Separate Mixtures Filtration: separates particles suspended in a liquid or gas from that of the liquid of gas by passing a mixture through a medium that retains those particles.
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 4 pages?

  • Fall '08
  • Kenney
  • Chemistry, pH, Chemical substance, Chemical compound, Constant Composition, physical process

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes