The scientist used the law of conservation of mass to predict that the total mass of the products would be 15.9 grams. This law says that in a chemical reaction, the total mass of the substances before the reaction must equal the total mass of the substances after the reaction. Since they started with 12.7 grams of copper and 3.2 grams of sulfur, they added those together to get 15.9 grams for the copper sulfide.
Use the chemical equation to complete the activity. 2Cu+S→Cu2S Copper (Cu) 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. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide. (2 points)
Write it like and 8th grader did it please.
11 answers
don't use big words and don't use , and make every thing lowercase
the scientist used the law of conservation of mass to predict that the total mass of the products would be 15.9 grams this law says that in a chemical reaction the mass of what you start with is the same as what you end up with since they started with 12.7 grams of copper and 3.2 grams of sulfur they added those together to get 15.9 grams for the copper sulfide
make it less smart please.
the scientist used the law of conservation of mass to say that the total weight of the stuff before the reaction is the same as after the reaction since they started with 12.7 grams of copper and 3.2 grams of sulfur they added them up to get 15.9 grams of copper sulfide.
If the atomic number of an element is six and the atomic mass is 15, how many neutrons does it have?
To find the number of neutrons in an element, you can use the formula:
Number of neutrons = Atomic mass - Atomic number
In this case, the atomic number is 6, and the atomic mass is 15.
Number of neutrons = 15 - 6 = 9
So, the element has 9 neutrons.
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What is the atomic mass of Boron?
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1 point
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5 amu
12.32 amu
10.8 amu
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1 point
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5 amu
12.32 amu
10.8 amu
The atomic mass of boron is approximately 10.8 amu. So the correct answer is 10.8 amu.
60 answers