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Science 5

Science 5. Physical Science. Standard/s Covered. Students will learn… what a chemical reaction is. how compounds are formed. how formulas of compounds provide information on its composition. REVIEW.

wilma-mcmahon
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Science 5

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  1. Science 5 Physical Science

  2. Standard/s Covered Students will learn… • what a chemical reaction is. • how compounds are formed. • how formulas of compounds provide information on its composition.

  3. REVIEW • Matter is anything that has mass and occupies space. Air, water, and pencil are all examples of matter. • Matter is made up of tiny particles called atoms. These atoms constantly move. • Molecules are formed when atoms combine. • Some molecules exhibit crystalline shapes: the particles occur in well-ordered patterns.

  4. A compound is formed when elements (or atoms) combine through a chemical reaction. The particles making up a compound are called molecules. Caffeine, found in coffee, is a compound made up of Carbon, Hydrogen, Oxygen, and Nitrogen. C8H10N4O2 is the formula for this compound.

  5. These terms may be confusing… • Atoms: the basic building block of matter. • Elements: There are 105 different elements on Earth, each represented by 117 different kinds of atoms. • Atoms combine in specific ratios to form compounds. Each particle representing a compound is called a molecule.

  6. Examples… • Water is a compound. The formula is H2O. Two atoms of Hydrogen combined with one atom of Oxygen to form one molecule of water.

  7. Other common compounds: A molecule of ammonia. This compound has the formula NH3. A molecule of Carbon dioxide. The compound’s formula is CO2.

  8. Molecules are formed through a process called chemical reaction. In a chemical reaction, molecules break up to form entirely new compounds.

  9. How is salt (NaCl) formed? 2Na  +  Cl2    2NaCl Sodium metal is silver and shiny. Salt is harmless, white, makes food taste better! Chlorine gas is a greenish gas that is very poisonous.

  10. In a chemical reaction… • The properties of the reactants (substances that entered the reactions) are very different from the properties of the product/s (substances that are produced).

  11. No mass is “lost” or “gained” in a chemical reaction.The mass of the reactants equal the mass of the products.

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