1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tju [1.3M]
3 years ago
8

A scientist performs an experiment in which a radium–226 (Ra–226) atom decays into radon–222 (Rn–222). The scientist concludes t

hat some energy must have been added to the system to cause this reaction to begin. Which would disprove his conclusion?
A) Radium–226 is an unstable isotope of radium.
B) Radon–222 is an unstable isotope of radon.
C) The decay released an alpha particle.
D) The decay released a beta particle and a gamma ray.
Chemistry
2 answers:
Agata [3.3K]3 years ago
8 0

Answer:

A) Radium-226 is an unstable isotope of radon

Explanation:

This was correct on my test

tangare [24]3 years ago
5 0

Answer:

B)

Explanation:

You might be interested in
What is the. color for base??????
valina [46]
It depends on the pH if the base. but normally light colors are for bases example blue green etc
4 0
3 years ago
Landslides are an example of
ivanzaharov [21]

Answer:

b. erosion.

I believe that this is the best answer

8 0
2 years ago
Read 2 more answers
A 1.25g sample of copper (cCu=0.386Jg∘C) is initially at a temperature of 25.0∘C. If the sample absorbs 87.4J of heat, what is i
professor190 [17]

Answer: Final temperature = 206∘C

Explanation:

Heat Energy is given as  

q= mCΔT

ehere

q= Heat energy = 87.4J

m= mass=1.25g

C=specific heat c= 0.386Jg∘C) ,

ΔT =  Change in temperate of which the final temperature= 25.0∘C

 q= mCΔT

ΔT = q/mC

ΔT = 87.4/ 1.25 X 0.386=181.14∘C

But,

T final- T initial = ΔT

T final = T initial + ΔT

T final = 25.0∘C +181.14∘C=206.14∘C rounded to 206∘C

4 0
3 years ago
Suppose the reaction between nitrogen and hydrogen was run according to the amounts presented in Part A, and the temperature and
andrew11 [14]

Explanation:

Assuming that moles of nitrogen present are 0.227 and moles of hydrogen are 0.681. And, initially there are 0.908 moles of gas particles.

This means that, for N_{2}(g) + 3H_{2}(g) \rightarrow 2NH_{3}

 moles of N_{2} + moles of H_{2} = 0.908 mol

Since, 2 moles of N_{2} = 2 \times 0.227 = 0.454 mol

As it is known that the ideal gas equation  is PV = nRT

And, as the temperature and volume were kept constant, so we can write

        \frac{P(_in)}{n_(in)} = \frac{P_(final)}{n_(final)}

          \frac{10.4}{0.908} = \frac{P_(final)}{0.454
}

       P_(final) = 10.4 \times \frac{0.454}{0.908}

                            = 5.2 atm

Therefore, we can conclude that the expected pressure after the reaction was completed is 5.2 atm.

7 0
3 years ago
Electromagnetic Waves can propagate (move through);
wariber [46]

Answer:

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

Explanation:

5 0
2 years ago
Other questions:
  • What orbitals are used to form the 10 sigma bonds in propane (ch3ch2ch3)? Label each atom with the appropriate hybridization. Dr
    5·1 answer
  • Nuclear energy could come from
    9·1 answer
  • Please i need the answer for 18,19,20<br><br><br>Answer and I will give you brainiliest <br>​
    5·1 answer
  • Is ammonia an alkali or base?​
    9·1 answer
  • Which of the following is NOT the same?
    7·2 answers
  • Why do molecular compounds have low melting points and low boiling points relative to ionic substances?​
    12·1 answer
  • Whivh is the correct mole ratio of K3N to KCI in the chemical reaction ​
    14·1 answer
  • Every ________ will have its own unique set of quantum numbers.
    6·1 answer
  • Can someone help me with this please?
    14·1 answer
  • What is the albedo affect
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!