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- 1. Multiple ChoiceIn a ___________change, a substance changes into a different substance.PhysicalChemical
- 2. Multiple ChoiceThe Law of Conservation of Mass statesthat matter exists in all states and reacts the samethat matter can only be changed into new substances by introducing a catalystthat matter exists in the same state throughout any chemical changethat matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
- 3. Multiple ChoiceHow many Al atoms are in this compound? 4Al2O32864
- 4. Multiple ChoiceHow many F atoms are in this compound?
6MgF226812 - 5. 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
- 6. 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
- 7. 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
- 8. Multiple Choice
How many Hydrogens are on the product side of this chemical equation?
1
2
3
4
- 9. Multiple Choice
How many Carbons are present on the reactant side?
1
2
3
4
- 10. Multiple Choice
What does it mean for a reaction to be endothermic? Choose 2 of the following.
When two substances react, the temperature of the mixture decreases.
When two substances react, the temperature of the mixture increases.
There is less energy going into the reactant to break the bond than there is energy leaving the product.
There is more energy going into the reactant to break the bond than there is energy leaving the product.
The amount of energy entering and leaving is the same.
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