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sveta [45]
2 years ago
10

Biologists classify all living things into __ kingdoms. A.five B.three C.six D.seven

Chemistry
2 answers:
ryzh [129]2 years ago
8 0

Answer:

B. three

Explanation:

sana nakatulong :,-)

Galina-37 [17]2 years ago
5 0
The answer would be “B” three! :)
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The motion of objects in regard to other objects is called_motion:
algol13
I’m pretty sure it’s the last one, relative
7 0
3 years ago
Consider the reaction C2H4(g) + H2O(g) --> CH3CH2OH(g)
arsen [322]

Answer:

K = 361.369

Explanation:

C2H4(g) + H2O(g) → CH3CH2OH(g)

∴ ΔG°f(298.15K) CH3CH2OH(g) = - 174.8 KJ/mol

∴ ΔG°f(298.15) C2H4(g) =  68.4 KJ/mol

∴ ΔG°f(298.15) H2O(g) = - 228.6 KJ/mol

⇒ ΔG°f(298.15) = - 174.8 - ( - 228.6 + 68.4 ) = - 14.6 KJ/mol

  • K = e∧(-ΔG°f / RT)

∴ R = 8.314 E-3 KJ/mol.K

∴ T = 298.15 K

⇒ K = e∧(-(-14.6)/((8.314 E-3)(298.15)))

⇒ K = e∧(5.889)

⇒ K = 361.369

6 0
3 years ago
Jon does an experiment in which he varies the amount of calcium chloride (CaCl2) powder used for the chemical reaction with sodi
asambeis [7]

Answer:

a.) increase

c.) collide more often with other reactant molecules

Explanation:

Generally, when you increase the quantity of reactants, the rate of the reaction increases (the forward reaction). When there are more reactants, there are more chances for them to interact with each other. More interactions means more reactions.

8 0
2 years ago
According to the equation 2Na + 2H2O mc012-1.jpg 2NaOH+H2, what mass of Na is required to yield 22.4 L of H2 at STP? (The atomic
lord [1]
2Na_{(s)}    +   2H _{2} O_{(l)}   ------\ \textgreater \    2NaOH_{(aq)}  +   H_{2}_{(g)}

moles of hydrogen in reaction  =  \frac{Volume}{Moles  at  STP}
                                        
                                                 = \frac{22.4 L}{22.5 L / mol}
         
                                                 = 0.996 mol

ratio of H_{2}  :  Na  is  1 : 2
∴ if mol of H_{2} = 0.996 mol

 then mol of Na      =   (0.996 mol * 2)
                              = 1.99 mol

Mass of Na  =  molar mass * mol
                    =  (22.99 g / mol) * (1.99 mol)
                    =  45.78 g

Note: 
   1) Molar Mass is the mass of an element measured in grams.

   2) According to Avogadro's Law, the same volume of different gases at the same condition of Temperature and Pressure contain the same number of particles.  From this law we know that at STP, one mole of gas occupies 22.4 L of volume (molar volume).

3) By calculating the mole of one specie in a reaction, one can use mole ratio based on the stoichimectric values (values used to balance the equation) given to the species upon balancing the equation  to find the moles of another species.
7 0
2 years ago
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Why is nonpoint source pollution potentially more harmful than point source pollution?
Vadim26 [7]
A, nonpoint souce pollution is "a main problem with water quality."
7 0
3 years ago
Read 2 more answers
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