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Reil [10]
3 years ago
11

What type of radioactive decay involves only the release of high-energy photons and therefore does not change the mass of an ato

m of a radioactive isotope?
Chemistry
1 answer:
Irina-Kira [14]3 years ago
6 0
Answer is: gamma emission or gamma decay.
<span>During gamma emission the nucleus emits radiation without changing its composition, if for example have nucleus with six protons and six neutrons (carbon atom) and after gamma decay there is nucleus with six protons and six neutrons.
</span>Gamma rays are the electromagnetic waves with the shortest wavelengths (1 pm), highest frequencies (300 EHz) and highest energy (1,24 MeV).
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What is the concentration if 20 grams of NaOH was dissolved in enough water to make a 250 mL NaOH solution?
gizmo_the_mogwai [7]

Answer: 1 molar NaOH contains 40 grams of NaOH per every liter of water

Explanation:

so 2 M NaOH contains twice that amount, ie. 80 grams per liter. Then, ine 250 ml of weater, there should be 80/4 = 20 grams of solid NaOH dissolved.

3 0
3 years ago
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babymother [125]
A theory does not change into a scientific law with the accumulation of new or better evidence. A theory will always remain a theory
5 0
3 years ago
X-122 has an abundance of 34.44%
Step2247 [10]

Answer:

amu = 42.02

Explanation:

to calculate the average mass, first convert the percentages to decimals by dividing by 100. then, multiply the decimal by the mass number for each isotope, then add them together.

( 0.3444 x 122 ) = 42.0168 round that answer to 42.02

7 0
3 years ago
How many moles are there in 4.7 x 10^24 molecules of water?
Ghella [55]

Answer:

7.81 moles

Explanation:

(4.7×10^24 )×1 moles divided by 6.02×10^23 molecules

8 0
3 years ago
Predict the products of the reaction below. That is, complete the right hand side of the chemical equation. Be sure your equatio
pickupchik [31]

Answer:

2 HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + 2 H₂O

Explanation:

This is a double-displacement reaction. In these reactions, the cation of one molecule swaps with the cation of another.

In this case, the hydrogen cation (H⁺) from HClO₃ swaps with the calcium cation (Ca²⁺) of Ca(OH)₂. When writing the products, keep the charges of the ions in mind. The products must be neutral, so some will need to have more than 1 cation/anion.

The unbalanced equation:

HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + H₂O

<u>Reactants</u>: 3 hydrogen, 1 chlorine, 5 oxygen, 1 calcium

<u>Products</u>: 2 hydrogen, 2 chlorine, 7 oxygen, 1 calcium

The balanced equation:

2 HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + 2 H₂O

<u>Reactants</u>: 4 hydrogen, 2 chlorine, 8 oxygen, 1 calcium

<u>Products</u>: 4 hydrogen, 2 chlorine, 8 oxygen, 1 calcium

4 0
2 years ago
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