Bell work – Define these familiar terms:

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Presentation transcript:

Bell work – Define these familiar terms: 1 – Matter 2 – Atom  3 – Chemistry  4 – Elements 

Atoms Molecule Compound Elements vs. Compounds Atoms 1. _______________ combine chemically to form a ____________. Molecule Compound 2. A ______________ is made of atoms of two or more different elements that are chemically combined.

Soft, gray metal Poisonous green gas 3) Compare the chemical properties of an element with the chemical properties of the compound. Sodium (Na) element Chlorine (Cl) element Soft, gray metal Poisonous green gas

Compound properties– Na combined with Cl 3) Compare the chemical properties of an element with the chemical properties of the compound. Compound properties– Na combined with Cl Sodium chloride

Flammable gas Colorless gas 3) Compare the chemical properties of an element with the chemical properties of the compound. Hydrogen (H) element Oxygen (O) element Flammable gas Colorless gas

Compound properties– H combined with O 3) Compare the chemical properties of an element with the chemical properties of the compound. Compound properties– H combined with O H2O (water)

Example____________ Example____________ 4) What is a pure substance? Matter that has fixed, uniform composition water Example____________ Example____________ salt

Chemical formula Chemical formula 5) A _________________ shows how many atoms of each element are in a unit of a substance. ________________ is a combination of chemical symbols and numbers that represent a substance. Chemical formula

6) Describe a mixture -- a combination of two or more substances that are not chemically combined.

7) How do mixtures differ from Pure substance? Mixtures do NOT chemically combine the substances. Pure substance are ALWAYS uniform.

Homogeneous mixture – looks the same throughout 8) Define the following: Homogeneous mixture – looks the same throughout Heterogeneous mixture – NOT evenly distributed

Try pages 10, 12, and13. We’ll be around to help! 