<span>A warm front occurs when a cold air mass retreats and is replaced by a warm air mass</span>
Answer:
(4) The navy needed a faster way to move ships between the Atlantic and Pacific Oceans.
Explanation:
The Panama Canal was an artificial eighty-two (82) kilometers water-way that connects the Atlantic Ocean with the Pacific Ocean in Panama and it enhanced maritime trades.
The construction of the Panama Canal became more important to the United States after the Spanish-American War because the navy needed a faster way to move ships
between the Atlantic and Pacific Oceans.
Answer:
II) Objects made of silver become tarnished.
Explanation:
Physical properties are the properties which can be observed without changing identity of substance.
Chemical properties are the properties which describe how the substance changes into the different substance completely.
Boiling is an example of physical change in state of the substance. Color is also an example of physical property like boiling point and hence these are constants. The reason of the color is that the chromium ions shows certain colors as the electrons are excited due to absorption of the light. The tarnishing of the silver is an example of the chemical change which occurs due to the reaction of the silver with oxygen. This is also known as corrosion.
Answer:
68.18%
Explanation:
The question asking for the percentage of sugar present in milk bar chocolate. To find the percentage of a certain molecule, you have to divide the mass of the molecule with the total mass of the product. The calculation will be:
sugar percentage = sugar weight / milk bar chocolate weight * 100%
sugar percentage = 7.5g / 11g * 100%= 68.18%
Arianna has discovered a substance that is a liquid at room temperature. Through testing, she finds that it ignites quickly and burns easily, but does not dissolve in water.
How would you classify the substance? What use might it have?
