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marshall27 [118]
4 years ago
14

Please help need answer asap!

Chemistry
2 answers:
meriva4 years ago
6 0
The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side
viva [34]4 years ago
3 0

Answer:

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.

Explanation:

MAKE ME A BRANLIEST IF THIS SUPPORTED YOUR ANSWER PLEASE

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Name 5 radioactive substances.<br>No spam..not less than 5​
ladessa [460]

Answer:

Cesium.

Cobalt.

Iodine.

Ionizing Radiation.

Plutonium.

5 0
3 years ago
Read 2 more answers
The half-life of strontium-90 is 28.1 years. Calculate the percent of a strontium sample left after 100 years.
Aliun [14]

Answer:

  • Option 4. 8.5%

Explanation:

The<em> half-life </em>time of a radiactive isotope (radioisotope) is a constant value, meaning that the amount of the radioisotope that decays will be (1/2) raised to the number of half-lives passed.

Naming A₀ the initial amount to the radioisotope, you can build this table to find the amount left.

Number of half-lives           amount of radiosotope left

       0                                              A₀

       1                                               (1/2) × A₀

       2                                              (1/2)×(1/2)×A₀ = (1/2)² × A₀

       3                                              (1/2)³ ×A ₀

       4                                              (1/2)⁴ × A₀

       n                                              (1/2)ⁿ × A₀

Now calculate the number of half-lives the strontium-90 sample has passed after 100 years:

  • n = 100 years / 28.1 years ≈ 3.5587

Hence, the amount of strontium-90 is:

(\frac{1}{2})^{3.5587}A_0=0.08486A_0

In percent, that is:

(0.08486A_0/A_0).100=8.486%

Rounding to two significant figures, that is 8.5%.

<u>Conclusion</u>: <em>The percent of strontium-90 left after 100 yeaers is 8.5% </em>(choice number 4).

6 0
4 years ago
What is the partial pressure of 0.50 mol Ne gas combined with 1.20 mol Kr gas at a final pressure of 730 torr?
WARRIOR [948]
  The partial pressure  of 0.50  Ne  gas    is   214.71  torr


      calculation

 the partial   pressure  of Ne  = moles  of Ne/total moles  x  final  pressure

 
find  the total  moles  of the air mixture  

that is moles of   Ne  +  moles of K=  0.50 + 1.20  =  1.70 moles
  

The partial  pressure  is therefore =   0.50 /1.70  x  730  =  214.71  torr
   
8 0
3 years ago
Read 2 more answers
Help Plzzz. (will vote brainliest)
kupik [55]
The difference would be that Mercury has a denser, warmer atmosphere and Earth has a not that dense and gassy atmosphere. The Earth's atmosphere also has a lot of layers while Mercury's doesn't. Those would be the reasons for them both being different. Hope this helped!
5 0
4 years ago
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What example of matter is a mixture
Natalka [10]

Answer:

Most of the matter around us, however, consists of mixtures of pure substances. Air, wood, rocks and dirt are examples of such mixtures. Mixtures can be further classified as Homogeneous and Heterogeneous.

5 0
3 years ago
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