What sort of reaction happens when a hydrogen-2 atom and a hydrogen-3 atom are converted to a helium-4 atom?fission
fusion
chemical
ionic
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Answer: The correct answer is fusion reaction.
Explanation:
Nuclear fission reaction is defined as the reaction in which a heavier nuclei dissociates into two or more lighter nuclei.
Nuclear fusion reaction is defined as the reaction in which lighter nuclei combines to form a heavier nuclei.
Chemical reaction is defined as the reaction in which change in composition takes place. A new substance gets formed in this type of reaction.
The chemical equation for the formation of helium-4 atom follows:
In the above reaction, two hydrogen nuclei are combining together to form a heavier nuclei which is helium atom.
Thus, the correct answer is fusion reaction.
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Which formula represents a polar molecule?(1) Br2 (3) CH4(2) CO2 (4) NH3
Answers
The discoverer of the electron was Thomson. J. J. Thomson portrayed his atom model to look like a plum pudding. In his model, he described that an atom is composed mainly of electrons stuck within a sea of positive material.
Final answer:
The 'plum pudding' model of the atom, which depicted negative electrons embedded in a positively charged mass, was proposed by J.J. Thomson in 1904. This model was later superseded by Ernest Rutherford's nuclear model, which described the atom as having a central, positively charged nucleus surrounded by orbiting electrons.
Explanation:
The atomic model that portrays negative electrons embedded within a sea of positive material is known as the 'plum pudding' model. This model was proposed by J.J. Thomson in 1904. It describes an atom as being primarily composed of an unknown positively charged mass, with negative electrons interspersed within, akin to plums in a pudding.
Thomson's model was a significant step forward in atomic theory, but it was also fundamentally flawed. It was eventually superseded by the nuclear model of the atom, proposed by Ernest Rutherford and his colleagues in 1911. Rutherford's model proposed that most of the atom's mass and its positive charge is concentrated in a central nucleus, with the negative electrons orbiting this central core, rather like the planets orbit the sun. This model more accurately accounts for atomic behavior and structure as we understand them today.
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Answer: radioactive isotopes may be used to Trace complex chemical processes.
Final answer:
Radioactive isotopes can be used to study complex chemical processes, such as determining the age of ancient artifacts using carbon dating.
Explanation:
Radioactive isotopes can be used to study complex chemical processes. This is because some isotopes emit radiation that can be detected and measured, allowing scientists to track the movement and transformations of chemicals in a reaction. For example, carbon-14 is a radioactive isotope that can be used to determine the age of ancient artifacts through a process called carbon dating. By measuring the amount of carbon-14 remaining in an object, scientists can calculate how long it has been since the carbon-14 was last replenished.
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Solid ➡ Liquid
Liquid ➡ Solid
Gas ➡ Solid
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Answer:
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When electrons absorb energy they are able to move from their ground states up to excited states. The answer is letter B. an example of this is when you light a match. The molecules of the matchstick are in its ground state. When you flick it on the ground or anything hard, it causes its molecules to move into the excited state and thus causing fire.