Matter can't disappear or appear magically. So, if you start with 12.7 grams of copper (Cu) and 3.2 grams of sulfur (S), the total mass should stay the same. This means that you need to end up with 15.9 grams of product(s). If the only product is copper sulfide (Cu2S), then you should have 15.9 grams of Cu2S.
To find out if this is true, you can weigh the reactants and compare it to the weight of the product(s). In this case, 12.7 + 3.2 equals 15.9 grams.
This rule is called the Conservation of Mass Law. It basically says that matter can't be created or destroyed. In this scenario, the law is proven because the total mass of the reactants and the product(s) is the same.
Re-write this in 7th grade words
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.
- The way to calculate this is by simply weighing the reactants as the mass of the reactants and product(s) will be the same.
- The answer is The Conversation of Mass Law. Basically what it means is that matter can’t be created or destroyed, this can be proven by the fact that 12.7 + 3.2 = 15.9
9 answers
Highest box office movie
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Oh God really?
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2nd highest box office movie
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