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- 1. Multiple ChoiceWhat is the Law of Conservation of mass?Mass is created in a chemical reactionMass is created in a physical changeNew chemicals formed from a chemical reaction have a larger overall mass than the original reactantsMass is never created or destroyed
- 2. Multiple ChoiceIn a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?4g5g9g14g
- 3. Multiple ChoiceMatter can not be created nor destroyed: it can only beDestroyed a little bitInvisibleTransformed, changedNone of the above
- 4. Multiple ChoiceIf a reaction starts with a total 75g of reactants it should producea total of 40g of productsa total of 75g of productsa total of 180 g of productsNone of the above
- 5. Multiple ChoiceIn the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?17g2g7gNone of the above
- 6. Multiple ChoiceA chemical reaction is balanced whenboth sides have the same elementsBoth sides have the same number of atomsSame subscriptsSame coefficients
- 7. Multiple ChoiceA precipitate is aliquid that forms when two solids are reacteda solid that forms when two liquids are mixeda gas that forms when vinegar and baking soda reacta change of color in a solution
- 8. Multiple Choice
The law of _____ states that mass is neither created nor destroyed during chemical reactions.
multiple proportions
definite proportions
universal gravitation
conservation of mass
- 9. Multiple Choice
Which ancient Greek philosopher was the first to propose that matter is made up of tiny individual particles called atoms?
Proust
Democritus
Dalton
Aristotle
- 10. Multiple Choice
What law states that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass?
Law of definite proportions
Law of conservation of mass
Law of multiple proportions
Law of mass action
- 11. Multiple Choice
A pure sample of ammonia contains 14 g of nitrogen and 3 grams of hydrogen. A second sample of pure ammonia contains 28 g nitrogen and 6 g of hydrogen. This is an example of the
law of universal gravitation
law of multiple proportions
law of definite proportions
law of mass action
- Answer choicesTagsAnswer choicesTags