Chemical equation
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The document discusses key aspects of chemical equations including: 1. Chemical equations have three main parts: reactants, reaction conditions, and products. 2. Mass is conserved in chemical reactions - the total mass at the start is the same as the total mass at the end. 3. Chemical reactions involve rearrangements of atoms, not changes to atoms themselves. Balancing chemical equations ensures the same number and type of atoms are on both sides.
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Chemical equation
- 2. All chemical equations have 3 major parts: Reactants reaction condition products Reactants: All chemicals or substances that you begin with Products: all the chemicals or substances that you end up with.
- 3. In a chemical reaction the mass you begin with is the mass you end up with. In a chemical reaction we don’t change atoms. This can be observed in a closed system. Closed system: nothing can escape Open system: things can escape If you consider a large enough container it always is a closed system.
- 4. We know that: 1. Atoms do not change types 2. Mass is conserved To have the same number of each atom in the reactants and products, you must balance the chemical equation. To Balance , add coefficient in front of the chemical formula. To help remember this, remember this sentence: I Have No Bright Or Clever Friends. Iodine, hydrogen, nitrogen, bromine, oxygen, chlorine, and fluorine
- 5. 1. Write the word equation 2. Write the symbol; ionic (polyatomic ions), covalent, diatomic compounds 3. Balance all atoms other than oxygen and hydrogen 4. Balance polyatomic ions if they appear in reactants and products 5. Balance oxygen 6. Balance hydrogen 7. Repeat 3-6 until no changes are made
- 6. Synthesis: Combining two compounds/ atoms together Decomposition: a molecule “falling” apart Single Displacement: one molecule replaces another in a molecule Double Displacement: two parts of two molecules switching places Combustion: something burning in oxygen to produce carbon dioxide and water