- The person that was right about the chemical change is Elsa
- Chemical changes can be regarded as one that takes place when chemical reactions occur and there is formation of new product such as chemical elements or compounds .
- Physical change are one that doesn't result to formation of new chemical substances .
- When someone eat because digestion occur due to breaking down of the food by enzymes into the small molecules the and as result of this new product is formed such as urine , energy and others
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<em>Therefore, Elsa is right.</em>
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Answer: 10,452 degrees
Explanation: the temperature will rise as more methane is added
The doctor required a 15% 750mL solution. To lower the concentration of the solution, you have to add more diluting liquid.
750mL * 0.15 = 112.5mL. This 112.5mL signifies the pure chemical or compound in the solution. This 112.5mL can be taken from the stock solution.
112.5 * 2 = 250mL of stock solution would be needed and 500 mL of the diluting agent should be added. Adding the two together would result to a 750mL solution of 15% concentration.
Answer:
2.0 atoms of K and 1.0 atom of S are needed to form a molecule of potassium sulfide.
Explanation:
- The potassium sulfide has the chemical formula <em>K₂S.</em>
∴ Every 1.0 molecule of K₂S composed of 2.0 atom of K and 1.0 atoms of S.
<u><em>So, 2.0 atoms of K and 1.0 atom of S are needed to form a molecule of potassium sulfide.</em></u>
