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Unit 4 Chemical Rxn

Unit 4 Chemical Reactions

QuestionAnswer
What is the large number in the front of the chemical formula that identifies the number of molecules? coefficient
What is the small number that shows the ratio of atoms? subscript
Give an example of a physical change. melting, freezing, evaporation
Is photosynthesis a physical or chemical change. chemical
Is H2O an element or a compound? compound
Is NaCl an element or a compound? compound
What is the law that states matter is not created nor destroyed? Law of Conservation of Mass
The chemical formula for glucose is C6H12O6. How many elements are in this formula? 3
How do you identify the number of elements in a chemical formula? count the different symbols
What are the substances on the left of a chemical equation? reactants
What are the substances on the right of the chemical equation? products
In the formula 2H2O, how many hydrogen atoms are present? 4
How do you calculate the number of atoms for an element in a compound? multiply coefficient x subscript
What does the arrow in the chemical equation mean? yields
Balance the equation C + H2 -> CH4? C + 2H2 -> CH4?
What is the minimum amount of energy needed to start a reaction? activation energy
How many carbon atoms are in 4CO2? 4
Created by: lschramme
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