Unit 4 Chemical Rxn Word Scramble
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Question | Answer |
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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