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arlik [135]
3 years ago
15

Mrs. Sail's class wanted to observe a local pond. The class collected some pond water to analyze. When they placed a drop of the

water under a microscope, they saw many microorganisms in the water. The pond water looked clear when they collected it in the jar, so what could explain the presence of these organisms? A) They must have grown in the jar overnight. B) The microorganisms are too small to be seen with the naked eye. C) Somehow, the jar was contaminated on the way from the pond to the class. D) The microorganisms only inhabit a very small section of the lake, and the class got lucky.
Chemistry
2 answers:
olasank [31]3 years ago
8 0

B) the microorganisms are to small too see with the naked eye

LiRa [457]3 years ago
3 0

B. its more of a reliable answer because it's true. You cant see it with the naked eye if you had to put in under a microscope.



I might be wrong.

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Calculate h30+ for a 8.86*10^3 hbr solution
Mademuasel [1]

[H₃O⁺] = 8.86 x 10³ M

<h3>Further explanation</h3>

The dissociation of water :

H₂O(l)⇒H⁺+OH⁻

Hydrogen ions H⁺ bond with H₂O to form H₃O⁺ ions(hydronium ion)

When acid(Hbr acid) is in the presence of water(dissociates), the H⁺ ions bond with water molecules to form hydronium, the reaction :

HBr(aq)+H₂O→H₃O+(aq)+Br−(aq

So Ionization of HBr :

\tt HBr\rightarrow H_3O^++Br^-

[HBr]= 8.86 x 10³,

From equation ratio [H₃O⁺] : HBr = 1 : 1, so

\tt [H_3O^+]=8.86\times 10^3

3 0
3 years ago
How are reactants different than products?<br>​
kupik [55]

Answer:

A reactant is there at the start of a chemical reaction, whereas a product is there at the end of a chemical reaction.

I hope this helps!

4 0
3 years ago
When a system is at equilibrium, ________. When a system is at equilibrium, ________. the reverse process is spontaneous but the
zavuch27 [327]

Answer:

When a system is at equilibrium, <u>the process is not spontaneous at either direction.</u>

Explanation:

The process is not spontaneous at either direction , when a system is at equilibrium  ΔG = 0, because -

We know that a negative ΔG indicates a forward-moving phase that is random.

We already know that a positive ΔG implies a non-spontaneous phase going forward.

Thus , here ΔG = 0, so the process is not spontaneous in either direction.

7 0
3 years ago
Calculating kinetic energy 1200kg car moving at 10​
valkas [14]

Answer:

60000J

Explanation:

Given parameters:

Mass of car  = 1200kg

Speed  = 10m/s

Unknown:

Kinetic energy  = ?

Solution:

The kinetic energy is given as:

   Kinetic energy  = \frac{1}{2}  m v²  

Now insert the parameters and solve;

   m is the mass

    v is the velocity  

 Kinetic energy  =  \frac{1}{2} x 1200 x 10²   = 60000J

6 0
3 years ago
The ideal gas law equation is: PV = nRT
nignag [31]

Answer:

The answer is the first option 0.37 moles

Explanation:

the ideal gas law is PV = nRT, so in the terms of n,

n = PV/RT (divide both sides by RT to let n stand alone)

given: P = 700 kpa, V = 2L, T = 450 K , R = 8.31

n = (700 * 2) / (8.31 * 450)

= 1400/3739.5

= 0.34

8 0
3 years ago
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