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- 1. Multiple ChoiceIn a chemical equation, is it true that -the reactant side and product side can have different numbers of atoms for each elementthere can be different elements on the reactant side and the product sidean element or compound must be accompanied by a phase changethe coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
- 2. Multiple Choice
Which of the following models best demonstrates a balanced chemical equation?FGHJ - 3. Multiple ChoiceThe reactants are on the left side of the chemical equation.TrueFalse
- 4. Multiple Choice
How many atoms in all are in a molecule of serotonin?
C10H12N2O
2224254 - 5. Multiple ChoiceCoal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?The shape of the coal changesOxygen is presentA new substance is producedCoal is made up of more than one element
- 6. Multiple ChoiceIs burning wood a chemical or physical change?chemicalphysical
- 7. Multiple ChoiceIs glass breaking a chemical or phyiscal change?chemicalphysical
- 8. Multiple ChoiceIs hammering wood together to build a house a chemical or physical change?chemicalphysical
- 9. Multiple ChoiceIs a a rusting bicycle a chemical or physical change?chemcialphysical
- 10. Multiple ChoiceIs melting butter for popcorn a chemical or physical change?chemicalphysical
- 11. Multiple ChoiceIs melting ice a chemical or physical change?chemicalphysical
- 12. Multiple ChoiceIs spoiling food a physical or chemical change?phyiscalchemical
- 13. Multiple ChoiceIs mixing lemonade powder with water a physical or chemical change?physicalchemical
- 14. Multiple ChoiceIs mowing the lawn a phyiscal or chemical change?physicalchemical
- 15. Multiple ChoiceWhich of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)ABCD
- 16. Multiple ChoiceWhat is the left part of a chemical equation called?
H2 + O → H2OReactantsProductsYieldsChemical Equation - 17. Multiple ChoiceIs this balanced?
2HgO → 2Hg + O2YesNo - 18. Multiple ChoiceIs this balanced?
Al + O2 → 2Al2O3YesNo - 19. Multiple ChoiceWhen materials combine to form new compounds it is a chemical change. Which example is a chemical change?baking powder fizzingwater boilingice meltingsugar cube dissolving
- 20. Multiple ChoiceWhich is an example of a chemical reaction?paper cut into small pieceschocolate melting in a panflour and sugar mixed in a bowlcookies baking in an oven
- Answer choicesTagsAnswer choicesTags