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Questions (4)
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
1 answer
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What procedure could be used to demonstrate that matter is conserved during a physical change?
A) Find the mass of a raw egg.
3 answers
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Sodium reacts with chlorine to form the compound sodium chloride, or salt. The chemical formula below shows how the two elements
3 answers
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Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. What statement
1 answer
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Answers (5)
D sounds like a chemical change
2Na + Cl2 -> 2NaCl
NO.
yes you did 54ty
A Pulleys system having 5 Pulleys is used to raise a 450N Load . Find the Mechanical Advantage and Hence the effort if the Efficency is 75%.
