Answer:
C. Beginning of autumn
Explanation:
On this image we can see the position of the Earth toward the Sun in four different parts of the year. WE can see that in one part of the year the Northern Hemisphere is tilted toward the Sun, while in the opposite part of the year it is the Southern Hemisphere that is tilted toward the Sun. In between them, we have 21 March and 23 September when both hemispheres are equally exposed to the sunlight. These to dates mark the beginning of spring and beginning of autumn. As they are dates when both hemispheres receive equal amounts of sunlight, it means that these are the dates when the equinoxes appear on Earth.
Answer:
The percentage loss in mass between sucrose solutions 0.5 mol/dm³ and 0.1 mol/dm³ is 80.0% loss in mass
Explanation:
The molecular formula of sucrose is C₁₂H₂₂O₁₁
The molecular mass of sucrose is 342.3 g/mol
Therefore;
The mass of sucrose in 0.1 mol/dm³ solution = 0.1 × 342.3 = 34.23 g
The mass of sucrose in 0.5 mol/dm³ solution = 0.5 × 342.3 = 171.5 g
The percentage loss in mass of the sucrose is given as follows;
![Percentage \ loss \ in \ mass = \dfrac{Original \ mass - New \ mass}{Original \ mass } \times 100](https://tex.z-dn.net/?f=Percentage%20%5C%20loss%20%5C%20in%20%5C%20mass%20%3D%20%5Cdfrac%7BOriginal%20%5C%20mass%20-%20New%20%5C%20mass%7D%7BOriginal%20%5C%20mass%20%7D%20%20%5Ctimes%20100)
Therefore;
![Percentage \ loss \ in \ mass = \dfrac{171.5 - 34.23}{171.5} \times 100 = 80.04 \%](https://tex.z-dn.net/?f=Percentage%20%5C%20loss%20%5C%20in%20%5C%20mass%20%3D%20%5Cdfrac%7B171.5%20-%2034.23%7D%7B171.5%7D%20%20%5Ctimes%20100%20%3D%2080.04%20%5C%25)
Which gives, the percentage loss in mass between sucrose solutions 0.1 mol/dm³ and 0.5 mol/dm³ is 80.0% to three significant figures.
Answer:
Chloroplasts are the food producers of the cell. They are only found in plant cells and some protists. Animal cells do not have chloroplasts. Every green plant you see is working to convert the energy of the sun into sugars. Plants are the basis of all life on Earth. They create sugars, and the byproduct of that process is the oxygen that we breathe. That process happens in the chloroplast. Mitochondria work in the opposite direction and break down the sugars and nutrients that the cell receives.
Explanation:
Saliva
Saliva contains an enzyme called salivary amylase.
Salivary amylase is an enzyme that breaks down complex carbohydrates molecules into simple or smaller carbohydrate molecules called maltose. The enzyme acts on carbohydrates in the mouth, initiating the process of digestion.
Salivary amylase is made by the salivary glands in the mouth. Maltose is later converted to glucose in the small intestine by another type of amylase called pancreatic amylase.