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Stolb23 [73]
2 years ago
10

Cuales diferencias tienen magnitudes y tiempo

Chemistry
1 answer:
ad-work [718]2 years ago
3 0

Answer: A difference of one magnitude between two stars means a constant ratio of brightness. In other words, the brightness ratio between a 5th magnitude star and a 6th magnitude star is the same as the brightness ratio between a 1st magnitude star and a 2nd magnitude star.

<u>Spanish Translation: </u>

Una diferencia de una magnitud entre dos estrellas significa una proporción constante de brillo. En otras palabras, la relación de brillo entre una estrella de 5ª magnitud y una estrella de 6ª magnitud es la misma que la relación de brillo entre una estrella de 1ª magnitud y una estrella de 2ª magnitud.

Explanation:

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Are there any parts of the human body that get oxygen directly from the air and not from the blood?
n200080 [17]

Answer: Cornea  

Explanation: The cornea is the only part of a human body that has no blood supply as it gets oxygen directly through the air.

3 0
3 years ago
Why can’t you perform single displacement reactions with group IA metals?
pishuonlain [190]
Answer is: because alkaline metals (group IA metals) are the strongest reducing agents and most reactive metals.
Reducing agent<span> is an element  or compound that loses an </span>electron<span> to another </span>chemical species<span> in a </span>redox <span>chemical reaction and they have been oxidized.
Alkaline metals tend to lose only one electron in redox reaction.</span>
5 0
3 years ago
What is the percent composition of dinotrogen pentoxide? With work shown please
iris [78.8K]

Answer:

%N = 25.94%

%O = 74.06%

Explanation:

Step 1: Calculate the mass of nitrogen in 1 mole of N₂O₅

We will multiply the molar mass of N by the number of N atoms in the formula of N₂O₅.

m(N): 2 × 14.01 g = 28.02 g

Step 2: Calculate the mass of oxygen in 1 mole of N₂O₅

We will multiply the molar mass of O by the number of O atoms in the formula of N₂O₅.

m(O): 5 × 16.00 g = 80.00 g

Step 3: Calculate the mass of 1 mole of N₂O₅

We will sum the masses of N and O.

m(N₂O₅) = m(N) + m(O) = 28.02 g + 80.00 g = 108.02 g

Step 4: Calculate the percent composition  of N₂O₅

We will use the following expression.

%Element = m(Element)/m(Compound) × 100%

%N = m(N)/m(N₂O₅) × 100% = 28.02 g/108.02 g × 100% = 25.94%

%O = m(O)/m(N₂O₅) × 100% = 80.00 g/108.02 g × 100% = 74.06%

7 0
2 years ago
What, if any, experimental evidence do you have that the equilibrium is affected by the addition of NaOH? How is this in accorda
vitfil [10]
Sodium Hydroxide (NaOH) is also known as lye which is a base (very high ph; Alkaline)

Now, in chemistry, equilibrium is what affects the reaction rate of a reaction.  If they are in equilibrium, the concentrations of them will not change (both reactants and products).

Now, lets say that to synthesize a certain chemical, we need it to be in an acidic environment with HCL or some other acid as the catalyst for the reaction.

Well, if we were to add Sodium Hydroxide to this which is very alkaline, the ph would change greatly which affects the reaction rate.  If we do not have enough energy to overcome the activation barrier, the reaction will not occur (atleast for a very long time).

However, a common mistake is thinking that a catalyst will affect the equilibrium.  This is not true.  The reaction will still take place but it will have a very slow reaction rate.

TLDR; Adding a catalyst (like NaOH or Sodium Hydroxide) will not change the equilibrium but instead change the reaction rate.  The reaction can still occur, although it can take a very, very long time (like diamonds turning into graphite)


7 0
3 years ago
What is cell theory and why is it important
IceJOKER [234]
Cells are the basic unit of structure in all organisms and also the basic unit of reproduction.

What is the this (^ that up there) a description of?
5 0
3 years ago
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