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mars1129 [50]
3 years ago
15

All organisms need to obtain _?__ from food to survive

Chemistry
1 answer:
PSYCHO15rus [73]3 years ago
3 0
All organisms need oxygen to survive
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Explain why the 4s sublevel fills before the 3d begins to fill as electrons are added.
tamaranim1 [39]

Answer: The energy of the 4-s subshell is lower than the energy of 3-d subshell.

Explanation:

During the filling of electrons in subshells, the lower energy levels are filled before the higher energy levels. Also known as Aufbau principle.

Energy of the sublevel = (n + l)

where : n = Principal quantum number

             l = Azimuthal quantum number(s=0,p=1,d=2,f=3)

Energy of 4-s subshell= (4+0) = 4

Energy of 3-d subshell=(3+2) = 5

Energy of 4-s subshell is lower than the energy of 3-d subshell, that is why 4s orbital is filled before the 3-d subshell.

4 0
3 years ago
Read 2 more answers
Please help I will mark brainly
wolverine [178]
The first one i think
8 0
3 years ago
Pls solve<br>question attached as image<br>​
patriot [66]

Answer:

a) formula for citric acid is - C6 H8 o7

b) lime water turns opaque after adding co2 due to the formation of calcium carbonate.

c) reaction 3 is displacement reaction where a high reactive metal displace a less reactive from its salt solution.

d) reaction 1) is combination reaction where two reactant combines to give a single product whereas reaction 2) is decomposition reaction where a single reactant splits into more that 1 products.

8 0
2 years ago
What is the best description of the Bohr model of the atom?
zheka24 [161]
The best description of the Bohr model of the atom is that the <span>atom consists of a nucleus with electrons orbiting at specific energy levels. Absorbed photons cause electrons to jump between energy levels. The answer is letter C.</span>
4 0
3 years ago
Which polymer structure should be used if a strong and heat - resistant adhesive is required?
alexira [117]

Cross-linked polymers are strong and heat - resistant hence they can be used for this purpose.

A polymer is obtained by the combination of small molecules called monomers. A polymer consists of a regular repeating unit of small molecules called monomers.

A cross-linked polymer is a polymer in which covalent bonds are used to join polymer chains together. Cross-linked polymers are strong and heat - resistant hence they can be used for this purpose.

Learn more: brainly.com/question/17638582

3 0
2 years ago
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