Question

I'll award a medal for the help!

1. Describe the current model of the atom.

2. How is the periodic table of elements arranged?

3. Compare and contrast physical changes and chemical changes.

4. Design an experiment that could be used to demonstrate a chemical or physical change. Explain what makes it a chemical or physical change and explain what happens to mass and energy

5. Design an activity that you could use to teach someone else about the laws of conservation of mass and energy.

Answer 1

elements are arranged in terms of increasing atomic number i.e. number of protons. but they are also arranged in groups based on the number of valence electrons. if you notice, the vertical columns, groups, all have the same number of valence electrons meaning that they have similar chemical properties.

well the current model of the atom electrons are most likely found in orbitals but they can be anywhere at any given moment. the nucleus is positively charged.

physical changes involve anything that doesn't change the bonding between atoms in the compound, like a phase change for example. from here you can easily infer what a chemical change would involve.

For the rest tell me your thoughts.