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ch4aika [34]
3 years ago
8

Which describes interactions between substances and stomata during photosynthesis?

Chemistry
1 answer:
Mariulka [41]3 years ago
8 0
The interaction between the substances and stomata is a chemical reaction, light energy strikes at the chlorophyll molecules, whose electrons gets excited to a state of higher energy, and they come back to their state of lower energy by emission of energy, which is accepted by a chain of acceptors, and energy is generated. 
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If Steve throws the football 50 meters in 5 seconds, what is the average speed of the football?
Alex787 [66]

Answer:

10 meters per second

Explanation:

7 0
3 years ago
.What is the effective number of bonds between the sulfur atom and each oxygen atom in the sulfate ion
Rzqust [24]

Answer:

The effective number of bonds in sulfate ion is 1.5

Explanation:

The number of chemical bonds between two atoms is known as the bond order.

In covalent bonds between two atoms, a single bond has a bond order of one, a double bond has a bond order of two, a triple bond has a bond order of three.

If there are more than two atoms in a molecule, the effective number of bonds can be determined by applying the following steps:

1. Draw the Lewis structure.

2. Count the total number of bonds.

3. Count the number of bond groups between individual atoms.

4. Divide the number of bonds between atoms by the total number of bond groups in the molecule.

For the sulfate ion, the resonance structure is shown in the attachment below. From the structure;

Total number of bonds = (2 × 2) + (2 × 1) = 6

Total number of bond groups = 4

Effective number of bonds = 6/4 = 1.5

Therefore, the effective number of bonds in sulfate ion is 1.5

6 0
3 years ago
A bicycle rider travels 50.0km in 2.5 hours.what is the cyclist average speed
Kamila [148]

Answer:

20 kmp

Explanation:

because if you divide 50 with 2.5 you get the speed per hour

5 0
3 years ago
Although Leonardo Da Vinci was well-known for being an artist, how has he contributed to the fields of motion and medicine?
Travka [436]
Leonardo da Vinci was a very talented artist who painted the Mona Lisa, the Last Supper, and many more famous paintings. These works were famous because of Leonardo’s understanding Linear Perspective, his integration of light and shadow, and his superb understanding of anatomy.
6 0
3 years ago
Read 2 more answers
2.7g of aluminum metal is placed into 200g of
ICE Princess25 [194]

Answer:

a.

2Al + 6HCl--> 2AlCl3 + 3H2

b.

take the atomic mass of Al =27.0, Cl = 35.5, and H= 1.0,

no. of moles = .mass / molar mass

no. of moles of Al placed = 2.7 / 27.0

=0.1 mol

Assuming Al is limiting (because the concentration nor volume of HCl solution is given).

From the equation, the mole ratio of Al : AlCl3 = 2:2 = 1: 1,

meaning for each 1 mole of Al reacted, it gives out 1 mole of AlCl3. This also means the no. of moles of Al reacted equals to the no. of moles of AlCl3 produced, which is 0.1 mole.

mass = no. of moles x molar mass

hence,

mass of AlCl3 produced = 0.1 / (27 + 35.5x3)

= 0.00075 g

c. since this question is unclear, and the concentration nor volume of HCl solution is given, part c cannot be answered. Please let me know if you have any more info regarding it! thanks :)

d. From the equation, the mole ratio of Al:H2 = 2:3, meaning every 2 moles of Al reacted, gives out 3 moles of hydrogen.

using this ratio,  no. of moles of H2 produced will = 0.1 x 3 / 2

=0.15 mol

At STP, the molar volume of gas is 22.4 dm3 mol-1,

volume = no. of moles x molar volume

hence volume of H2 obtained = 0.15 x 22.4

= 3.36 dm3

6 0
4 years ago
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