# Chemistry

2Cu + S ~~~> Cu2S
Copper (C) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction all of the copper and all of the sulfur react.The scientist needs to determine how many grams of copper sulfide the reaction will produce. Use the law of conservation of mass in the explanation.

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1. Hi Smiley face. Do you know what the Law of Conservation of mass says? Matter is neither created nor destroyed. Therefore, you have started with 12.7 g Cu and 3.2 g S on the left for a total of 15.9 g; therefore, you must obtain 15.9 g of product(s). If Cu2S is the only product there must be 15.9 g Cu2S.

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DrBob222
2. Hi ugh ly

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3. Ugly

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4. PLS- loll

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6. hey bert
you could try this out.
The way to calculate this is by simply weighing the reactants as the mass of the reactants and product(s) will be the same.

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7. Thanks! XD

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8. guys stop and pls post the answer because i need help

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9. Well, I wish I came sooner.

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11. The answer is The Conversation of Mass Law. Basically what it means is that matter canβt be created or destroyed, this can be proven by the fact that 12.7 + 3.2 = 15.9

Please paraphrase that so that you donβt get in trouble!

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12. shut up

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13. Wow, these answers are pretty recent- I might post the answers when I get it done :]

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14. Thank you

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15. The scientist must have used The law of Conservation of Mass. Which states that mass cannot be created nor destroyed.

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18. hello roaches the goat πππ

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19. big

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20. @Why is Levi so HOT! i agree with your name

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21. @xiao he dont kno u keep grinding ur ugly

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23. xD

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24. this answer section has the combined iq of a goldfish

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1.A student cuts some fabric into two pieces. Is this change physical or chemical? It is a physical change because there is no reaction.

2. How are chemical changes different from physical changes? They form new substances.

3. How does a balanced chemical equation demonstrate the Law of Conservation of Mass? it shows that no atoms have been gained or lost during the reaction

4. If you change the 2 in front of 2O2 to a 3, what will be the change in the results on the right side of the equation? There is an extra O2 molecule left over.

5. Which procedure could be used to demonstrate that matter is conserved during a physical change? Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.

6. One molecule of bromine (Br2) and two molecules of potassium chloride (KCl) combine in a reaction. How many atoms are in the products? six

7. Which statement comparing ionic and covalent bonds is correct? Covalent bonds tend to be less polar than ionic bonds.

8. Acid-base reactions can also be classified as which type of reaction? double replacement

9. Which statement correctly compares synthesis and decomposition reactions? Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form A + B β AB, while decomposition reactions are in the form AB β A + B.

10. Aluminum oxide, Al2O3, decomposes into aluminum, Al, and oxygen gas, O2. Which ratio of aluminum to oxygen gas is in the products of the reaction? 4:3

11.The left side of a chemical reaction is shown.Cu + AgNO3 β Which type of reaction will the reactants undergo? single displacement

12. Which phrase describes an oxidizing agent? a substance that gains an electron in a reaction.

13. Which event is an example of an exothermic reaction? combustion.

14. Carbon monoxide and oxygen combine to produce carbon dioxide. The total bond energy of the products is 1,472 kJ. The bond energy of each carbon-oxygen bond in carbon dioxide is ββ- 368 kJ

15. Which statement about the reaction is correct?
The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products.

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27. jess is correct ! 100%

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