Chapter 4 Lesson 2 Describing Chemical Reactions

a way to show a chemical reaction, using symbols instead of words

• mathematical equation
• alphabetical equation
• numerical equation
• chemical equation

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NGSS.MS-PS1-5

a combination of symbols that represents the elements in a compound

• pictorial representation
• alphabetical sequence
• mathematical equation
• chemical formula

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NGSS.MS-PS1-1

the substances at the beginning of a chemical reaction

• reactants
• inhibitors
• catalysts
• products

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NGSS.MS-PS1-2

at the end of the reaction , the new substances are called the

• catalysts
• reactants
• products
• ingredients

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

during a chemical reaction, matter is not created or destroyed. this is called

• The law of conservation of weight
• The law of conservation of mass
• The law of conservation of volume
• The law of conservation of energy

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NGSS.MS-PS1-5

system where matter can enter from or escape to the surroundings

• open system
• closed system
• isolated system
• vacuum system

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a system where matter does not enter or leave

• isolated system
• open system
• closed system
• dynamic system

number placed in front of a chemical formula in an equation

• subscript
• exponent
• radical
• coefficient

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NGSS.HS-PS1-7

two or more elements or compounds combine to make a more complex substance

• evaporation
• decomposition
• sublimation
• synthesis

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

occurs when compounds break down into simpler products

• Combination
• Evaporation
• Oxidation
• Decomposition

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NGSS.MS-PS1-2

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