Question

constructing an evidence - based argument
use the scaffold below to critique the two possible claims and to construct the strongest argument based on the evidence.
investigation question: is our sun releasing energy due to chemical or nuclear reactions?
possible claim #1
the sun is releasing energy due to...
evidence for claim #1
the evidence that supports this claim is...
evaluation and critique
use your science knowledge to critique claim #1 by considering the quality and strength of the evidence.
possible claim #2
the sun is releasing energy due to...
evidence for claim #2
the evidence that supports this claim is...
evaluation and critique
use your science knowledge to critique claim #2 by considering the quality and strength of the evidence.
decide which claim you think is best supported. write a scientific argument that includes the following:

• the investigation question;
• the claim you think is best - supported by the evidence;
• a summary of the evidence that supports your claim;
• the critique of your claim compared to the other claim based on the evaluation of the evidence.

Explanation:

Step1: Recall energy - production in Sun

The Sun's energy comes from nuclear fusion. Chemical combustion cannot produce the vast amount of energy the Sun emits over billions of years.

Step2: Analyze Claim 1

Claim 1 says the Sun's energy is due to chemical combustion of hydrogen. Chemical reactions release energy through electron - transfer, which is much less energetic than nuclear reactions.

Step3: Analyze Claim 2

Claim 2 says the Sun's energy is due to nuclear fusion of hydrogen. Nuclear fusion combines hydrogen nuclei to form helium, releasing a huge amount of energy according to Einstein's $E = mc^{2}$ equation.

Step4: Provide evidence for Claim 2

Scientists have measured the Sun's composition and temperature. The high - temperature and high - pressure conditions in the Sun's core are suitable for nuclear fusion. Also, the detection of neutrinos, which are by - products of nuclear fusion in the Sun, provides strong evidence.

Step5: Evaluate and critique

Claim 1 is weak because chemical reactions cannot sustain the Sun's energy output for its long lifetime. Claim 2 is well - supported by multiple lines of evidence such as composition analysis, temperature measurements, and neutrino detection.

Answer:

Investigation Question: Is our Sun releasing energy due to chemical or nuclear reactions?
Best - supported claim: The Sun is releasing energy due to the process of nuclear fusion of hydrogen.
Evidence summary: The Sun's high - temperature and high - pressure core conditions are suitable for nuclear fusion. Composition analysis shows a large amount of hydrogen. Detection of neutrinos, by - products of solar nuclear fusion, provides strong evidence.
Critique: Claim 1 (chemical combustion) is weak as chemical reactions are not energetic enough to sustain the Sun's long - term energy output. Claim 2 (nuclear fusion) is well - supported by multiple scientific measurements and observations.