PS Topic 2.2c Eval – The Law of Conservation of Matter
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- Question 1 of 10
1. Question
1 point(s)Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?CorrectIncorrect - Question 2 of 10
2. Question
1 point(s)What will weigh more when a chemical change is complete? Â The reactants before the chemical reaction, or the product after the reaction is complete?
CorrectIncorrect - Question 3 of 10
3. Question
1 point(s)Suppose a reaction were to happen in an open container in a lab. Â During the reaction, the scientist observes the chemicals bubble, and produce a gas. Â During the analysis the scientist notices that the reactants weighed 24 g when he started, and the product weighed 19 g. Â Explain what happened.
CorrectIncorrect - Question 4 of 10
4. Question
1 point(s)If there are 8 Fluorine atoms on the reactant side, how many Fluorine atoms will be on the product side?
CorrectIncorrect - Question 5 of 10
5. Question
1 point(s)The Law of Conservation of Matter states that…
CorrectIncorrect - Question 6 of 10
6. Question
1 point(s)Use the following diagram to match the correct answers with the questions below:
Substances Measured Mass (in grams) Empty cup 2.8 g Cup, baking soda and vinegar (before the reaction) 9.018 g Cup, baking soda and vinegar (after the reaction) 8.347 g Sort elements
- 6.218 g
- 0.671 g
- Gas escaped the chemical reaction
- What is the mass of the reactants before the reaction?
- What is the apparent change in mass of the reacting substances?
- Why did the mass go down after the reaction?
CorrectIncorrect - Question 7 of 10
7. Question
1 point(s)The Law of Conservation of Matter is the reason why a chemical equation MUST be
CorrectIncorrect - Question 8 of 10
8. Question
1 point(s)Check ALL of the following chemical reactions that demonstrate the Law of Conservation of Mass?
CorrectIncorrect - Question 9 of 10
9. Question
1 point(s)How many atoms of oxygen are on each side of the following equation: 4Al + 3O2Â –> 2Al2Â O3
CorrectIncorrect - Question 10 of 10
10. Question
1 point(s)Does the following chemical equation demonstrate the Law of Conservation of Matter?
2H2O + O2Â –> 4MgO + 3Fe
CorrectIncorrect