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- 1. Multiple ChoiceWhen a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?a change of colora change of statea temperature decreasea temperature increase
- 2. Multiple ChoiceWhat types of reactions absorb and release heat?acidic and basicendothermic and exothermicendothermic and heat transfusioncovalent and ionic
- 3. Multiple ChoiceA scientist combines chemicals and produces an exothermic reaction. What byproduct of this reaction would show that it is exothermic?heatcoolnessa precipitategas bubbles
- 4. Multiple ChoiceWhich of the following is a chemical change?water freezes to form icesugar dissolves in watergasoline burns in a car enginea piece of metal expands when it is heated
- 5. Multiple ChoiceIn the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.reactantsproductsneutralsenergizers
- 6. Multiple ChoiceA change in the shape of an object is an example of _________________.a chemical changeenergyan endothermic changea physical change
- 7. Multiple ChoiceWhat type of change occurs when a new substance is formed that has different properties from the original substances?chemical changenuclear changephysical changemutation
- 8. Multiple ChoiceIncreasing the concentration of a reactant in a chemical reaction will _____________.decrease the rate of the reactionstop the reaction from happeningincrease the rate of the reactionhave no effect on the rate of the reacion
- 9. Multiple ChoiceWhich of the following represents a chemical change?cutting a piece of paper with scissorscooling a mixture of air and kerosene vapor to obtain liquid keroseneburning a piece of notebook paper in the presence of oxygenheating water over a flame to its boiling point
- 10. Multiple ChoiceWhich of the following is an example of a physical change?souring milkmixing baking soda and vinegarrusting metalmixing oil and vinegar
- 11. Multiple ChoiceWhich of the following is a chemical change?the rusting of irondissolving salt in watermelting an ice cubebending a copper wire
- 12. Multiple ChoiceWhich of the following is an example of a chemical change?rusting of a bicyclepainting a housewashing a dogtearing up a newspaper
- 13. Multiple ChoiceWhich is an example of an endothermic reaction?burning woodairplane using fuelplant leaves using photosynthesisdigesting food
- 14. Multiple ChoiceWhich is an example of a physical change?sodium and chlorine form salta copper ring turns white and greena log burns in a fireusing sand and water to build a sand castle on a beach
- 15. Multiple ChoiceIf you combine two substances in a beaker at room temperature and the beaker feels cold to the touch, it means that the substances:have not reacted with each otherhave undergone an endothermic reactionhave undergone a physical changehave undergone an exothermic reaction
- 16. Multiple ChoiceWhich of the following is an example of a physical change?wood burningice meltingfood digestingiron rusting
- 17. Multiple ChoiceIn any chemical reaction, the mass of the products is always:slightly less than the mass of the reactantsmuch less than the mass of the reactantsthe same as the mass of the reactantsgreater than the mass of the reactants
- 18. Multiple ChoiceRaising the temperature of a chemical reaction would make the reaction __________________.happen slowerhappen fasterstop completelyproceed as normal
- 19. Multiple ChoiceYour mother used pancake mix, eggs, and milk to make pancakes. Which of these is the product?the pancake mixthe eggsthe milkthe pancakes
- 20. Multiple ChoiceHow do chemical reactions turn substances into new substances?with burning acidthe molecules mix together and create new substancesthe atoms break apart and combine back together in new waysthe ionic compounds mix in water to form solutions
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