Answer: Based on experimental data
Explanation: The hypothesis is not the ultimate proven theory, the more a preliminary assumption on the basis of which further research is carried out with the help of experiments in order to prove the hypothesis as accurate. If the experiments carried out showed that the hypothesis is wrong, it is necessary to revise the hypothesis and set up a new experiment.
Answer:
TRUE
Explanation:
Answer:
Given the word is '' HEURISTICS '' the Total no of letters is 10 Since C mus
Explanation:
Answer:
CCI2
Explanation:
(2) 45 K (4) 45°C
The iron bar at 325 K will gain energy from the water if the water temperature is higher, which is the case when it is 65°C (338 K). The bar would lose energy to the other given temperatures (45 K, 65 K, 45°C).
The transfer of thermal energy, or heat, is from a body at higher temperature to a body at lower temperature. The iron bar in your question is at 325 K. The temperatures of the water samples are closer to room temperature (around 293 K) when expressed in Kelvin. Therefore, the iron bar will gain energy from the water if the temperature of the water is 65°C (338 K), as it is the only option above the temperature of the iron bar. It would lose energy to the other options (45 K, 65 K, 45°C).
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Answer:
D. The melting of ice
Explanation:
An endothermic reaction ABSORBS heat from its surroundings, it does NOT give heat off into its surroundings.
so...
When a match burns, it gives of heat. So A is incorrect.
When water goes from a vapor into a liquid, the water molecules loose kinetic energy, they do not gain it. And since temperature is the measure of the average kinetic energy in a substance, the water vapor looses heat. If the process was endothermic, it would be gaining heat. So B is incorrect.
When propane gas combusts, the explosion lets off heat into its surroundings, it does not absorb heat. So C is incorrect.
Here's what happens when something melts: the molecules inside the substance receive more and more kinetic energy, until the substance's molecules have enough kinetic energy to vibrate and wiggle past each other, breaking their structure. When ice melts it is receiving kinetic energy from its surroundings, and again, since temperature is the measure of the average kinetic energy in a substance, the process is absorbing heat. Q.E.D.,
D is the correct answer.