Question

7 multiple choice 2 points given the diagram representing a reaction: which type of change is represented? fission fusion deposition evaporation 8 multiple choice 2 points which of the following statements accurately describes alpha particles in terms of charge and mass? alpha particles are positively charged and less massive than beta particles. alpha particles are negatively charged and less massive than beta particles. alpha particles are positively charged and more massive than beta particles. alpha particles are negatively charged and more massive than beta particles.

Explanation:

• Question 7: Nuclear fission is a process where a heavy nucleus (like \(^{235}_{92}U\)) splits into smaller nuclei (like \(^{94}_{38}Sr\) and \(^{140}_{54}Xe\)) along with the release of neutrons. In the given diagram, a uranium - 235 nucleus absorbs a neutron and then splits, which is characteristic of fission. Fusion is the combining of light nuclei. Deposition is a phase change (gas to solid) and evaporation is a phase change (liquid to gas), which are physical changes, not nuclear changes.
• Question 8: Alpha particles (\(\alpha\)) are composed of 2 protons and 2 neutrons. Protons have a positive charge, so \(\alpha\) - particles are positively charged (\(+ 2e\)). The mass of an \(\alpha\) - particle (\(m_{\alpha}\approx4u\)) is much larger than the mass of a beta particle (\(\beta\), which is an electron, \(m_e\approx\frac{1}{1836}u\)).

Answer:

• Question 7: fission
• Question 8: Alpha particles are positively charged and more massive than beta particles.