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- 1. Multiple Choice
Is ths a chemical or a physical change?Chemical changePhysical change - 2. Multiple ChoiceWhy is tearing a piece of paper only a physical change?It changes the paper.It is hard to tear.It only changes its size, but it's still paperNone of the above
- 3. Multiple ChoiceIs burning a campfire a chemical or physical change?ChemicalPhysical
- 4. Multiple ChoiceWHY is burning a campfire a chemical change?It created a new substance with new propertiesIt changes in sizeThere is a lot of smokeThe logs get smaller
- 5. Multiple ChoiceThis is an accurate model because...It is missing one more CO2 in the model.Only the reactant side has the correct models for the formulas of each molecule.It has the correct number of molecules and atoms for both sides of the equation.None of the above
- 6. Multiple ChoiceIn this model, the reactants are...2H2OH2O22H2O2
- 7. Multiple ChoiceIn this model, the PRODUCTS are2KI and 2KNO32KI and Pb(NO3)2PbI2 and 2KIPbI2 and 2KNO3
- 8. Multiple ChoiceWhat does the ARROW mean in a chemical reaction?goequalsyieldsstop
- 9. Multiple ChoiceWhat is a PRECIPITATE?When it rains.When a solid forms after 2 liquids mix and react.When a solid forms after steam is produced.When a solid forms after a liquid freezes.
- 10. Multiple ChoiceIs ice freezing a physical or chemical change?physicalchemical
- 11. Multiple ChoiceWhy is ice freezing ONLY a physical change?The ice is colder than water.It can stay cold when you put it in the freezer.The molecules of water do NOT change. They only slow down and vibrate in position.Its physical appearance does NOT change.
- 12. Multiple ChoiceIn Elephant toothpaste, what evidence shows a chemical reaction took place?Formation of a solidFormation of a gas (oxygen)Formation of carbon dioxideFormation of a gas (nitrogen)
- 13. Multiple ChoiceWhy is this model incorrect?It needs more hydrogen on the reactant side.It is NOT incorrect. It is accurate the way it is.It needs to have one more water molecule on the reactant side.It needs more oxygen on the reactant side.
- 14. Multiple ChoiceIn this chemical reaction,Propane and carbon dioxide yields water and oxygen gas.Propane and oxygen gas yields carbo dioxide, water, and heat/light.Propane and oxygen equals carbon dioxide, water, heat and light.Propane and water yield carbon dioxide, oxygeh, and heat.
- 15. Multiple ChoiceIn this reaction, sugar became carbon and water using sulfuric acid as a catalyst. What evidence showed a chemical change?A new substance, frozen ice, and a change in colorA new substance, a change in color, heat, gas formationA new substance, heat, and steamA new substance, a precipitate forming, a change in temperature
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