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Alona [7]
2 years ago
8

this is so CONFUSING WTH anyone kind to help with those two questions just answer how much you know, I’ll still brainlist it’s u

rgent!

Chemistry
1 answer:
Ganezh [65]2 years ago
3 0

Answer:

4. mutualism - both benefit

5. Commensalism- one benefits while the other is not affected

"Mutualism is a symbiotic relationship in which both species benefit. Commensalism is a symbiotic relationship in which one species benefited while the other species is not affected."

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A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lo
wariber [46]

The answer is: It expands when it freezes.

When molecule frezes, it lose energy. When molecules are far apart, it means the volume is greater and it expands.  

For example, ice expands when water is freezing.  

Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.  

6 0
3 years ago
What ions are formed when naoh is dissolved in water?.
valentina_108 [34]

Answer:

When sodium hydroxide (NaOH) dissolves in water, it separates into positively - charged sodium ions (cations) and negatively - charged hydroxide ions (anions).

Hope this helped.

7 0
2 years ago
How many atoms are in 2.70 moles of iron (Fe) atoms?
vredina [299]
The answer is <span>1.63 × 1024 atoms Fe.
</span>

Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance:

<span>6.023 × 10²³ atoms per 1 mole
</span>So, how many atoms are per 2.70 moles:

6.023 × 10²³ atoms : 1 mole = x : 2.70 moles
x = 6.023 × 10²³ atoms * 2.70 moles : 1 mole
x = 16.3 × 10²³ = 1.63 × 10 × 10²³ = 1.63 × 10²⁴ atoms


3 0
3 years ago
Which colorless and odorless gas, produced by radioactive decay of Uranium-238, is considered to be a cancer-causing agent?
alexdok [17]
<span>The correct answer is b. Radon. Oxygen, Hyrdrogen, and Boron, are not radioactivel ike Radon and it regenerates quickly meaning that even though it has a short half-life period, it stays for a long time once released. It also has no taste so it's difficult to notice without proper gear because you can't feel it.</span>
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3 years ago
At what temperature <br> does water boil
Ipatiy [6.2K]
The temperature is a 100
5 0
3 years ago
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