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Chemical Reactions
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balance this equation: Ca + H₂O → Ca(OH)₂ + H₂
Ca + 2 H₂O → Ca(OH)₂ + H₂
Balance this equation: Mg + O₂ → MgO
2 Mg + 1 O₂ → 2 MgO
Balance this equation: Na + Cl₂ → NaCl
2 Na + Cl₂ → 2 NaCl
What form of energy is often released in chemical reactions?
Heat
What process produces rust?
Oxidation
What type of change is usually hard to reverse?
Chemical
What type of change is usually easy to reverse?
Physical
What small particle theory is used to explain conservation of mass?
Particle
What element reacts with hydrogen to make water?
Oxygen
What type of equation shows equal numbers of each atom on both sides?
Balanced
What law states that mass is neither created nor destroyed in a reaction?
Conservation (of Mass)
What does the word conservation mean?
Staying the same
Who discovered the law of conservation of mass?
Lavoisier
What symbol is used in equations to mean “yields” or “produces”?
→ (Arrow)
What word means "the new substances formed in a chemical change"?
products
What name is given to substances at the end of a reaction?
products
What name is given to substances at the start of a reaction?
reactant
What type of change occurs when paper burns?
Chemical
What type of change occurs when ice melts?
Physical
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