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sergij07 [2.7K]
3 years ago
15

1. In which of these cases do we have enough information to say that the atom is electrically neutral?

Chemistry
2 answers:
hammer [34]3 years ago
8 0
We can say an atom is electrically neutral if both electron (for electric charge) and proton (for positive charge) have the exact same amount
Since the number are needed in some amount to be considered stable (*2-1st level<span>-need 8 for valence level) , </span><span> The atom that has 7 protons and 7 electrons would be considered enough</span>
xxTIMURxx [149]3 years ago
6 0
The answer is the atom that has 7 protons and 7 electrons.
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What is the rate for the second order reaction Products when [A] = 0.371 M? (k = 0.761 M's")​
AlekseyPX

Given :

Concentration of product [A] = 0.371 M .

Rate constant , R = 0.761\  M^{-1}t^{-1} .

To Find :

The rate for the reaction .

Solution :

We know , for second order reaction , rate is given by :

r=k[A]^2\\\\r=0.761\times 0.371^2\ M/t\\\\r=0.10\ M/t

Therefore , the rate for the second order reaction is 0.1 M/t .

Hence , this is the required solution .

6 0
3 years ago
How can an iceberg (temperature=0 Celsius) have more energy than a burning match head (temperature=230 Celsius)?
jok3333 [9.3K]
Temperature is the average energy of each particle and does not really give you an indication of the total internal energy.  That being said, total internal energy is the sum of all of the molecule's energy in a given object so it would make sense that an ice berg (having a huge number molecules at a lower average energy) would have more internal energy than a match head (having a much smaller number of molecules at a higher average energy).  Basically, the fact that ice bergs tend to be huge and contain much more molecules than a match head, means that ice bergs can have a larger total internal energy which means they store more energy.

I hope this helps.
5 0
3 years ago
What does the number 5 represent in 5 AlPO4
olga2289 [7]

Answer: The number 5 represents the coefficient, which is also equal to the number of moles of the formula unit above.

4 0
2 years ago
A balloon containing helium gas expands from 230
andre [41]

Answer:

1.0 *10^(-4) mol

Explanation:

For gases:

n1/n2 = V1/V2

n1/3.8*10^(-4) mol = 230 mL/ 860 mL

n1 = 3.8*10^(-4)*230/860 = 1.0 *10^(-4) mol

5 0
3 years ago
when carbon dioxide is bubbled through lime water the solution first turn milky and to colour less . Explain why these changes o
Annette [7]

Answer:

When excess of carbon dioxide is passed in lime water, calcium carbonate is converted to calcium bicarbonate which is soluble, hence the milkiness due to calcium carbonate disappears.

Explanation:

Ca(OH)2+CO2 → CaCO3 (Milkiness) ↓+H2O

CaCO3+H2O+CO2 → Ca(HCO3)2 (soluble)

5 0
3 years ago
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