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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:

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5 0
3 years ago
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True or false: If you rub things together, electrons can move from one atom to another?
Sedbober [7]

Answer:

true

Explanation:

there is a transfer of electrons from one material to the other material. This causes one object to become positively charged (the electron loser) and the other object to become negatively charged (the electron gainer).

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3 years ago
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By pushing backwards a roller skater moves forward. This is an example of Newton's
joja [24]

Answer:

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7 0
3 years ago
An ultraviolet ray of light has a wavelength of 1.5x10^-8 m. What is the ray's<br> frequency?
frutty [35]

Answer:

2 E16 Hz    or     2 * 10^16 Hz

Explanation:

The formula to determine frequency is f = c / λ.

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This makes sense because UV light exists roughly

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8 0
3 years ago
For an alloy that consists of 91.0 g copper, 111 g zinc, and 7.51 g lead, what are the concentrations (a) of Cu (in at%), (b) of
viktelen [127]

Answer:

\% Cu=45.2\%\\\\\% Zn=53.6\%\\\\\% Pb=1.2\%

Explanation:

Hello!

In this case, given the masses of copper, zinc and lead, it is possible to compute the moles via their atomic masses first:

n_{Cu}=\frac{91.0gCu}{63.55g/mol}=1.432mol\\\\ n_{Zn}=\frac{111gZn}{65.41g/mol}=1.697mol\\\\n_{Pb}=\frac{7.51gPb}{207.2g/mol}=0.0362mol\\

Now, we compute the atomic percentages as shown below:

\% Cu=\frac{1.432}{1.432+1.697+0.0362}*100\% =45.2\%\\\\\% Zn=\frac{1.697}{1.432+1.697+0.0362}*100\%=53.6\%\\\\\% Pb=\frac{0.0362}{1.432+1.697+0.0362}*100\%=1.2\%

Best regards!

4 0
2 years ago
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