Lab question analysis Problems

How do you think that metallic salts are used in fireworks?

It’s a burst of photons. When electrons already release energy and give off light, thats when the main firework is shown (ignights when it gets released into the sky, then in the sky the absorbed electrons fall down energy levels)

Why do different elements have different flame test colors?

Each element has it’s own distinct fingerprint, meaning it has it’s own set of electrons which have different ways to absorb and release energy within the atom. When releasing energy, it produces photons, which energy in the form of light (what we see as color). Each element has different photons (as they all have different electrons), therefore they all have different types of colors.

How does the flame test support Bohr’s model of an atom?

Bohr’s model shows each specific energy level and the atoms in which cover them. When atoms absorb energy, they jump up throughout those energy levels and once released they go back down. So at the flame test shows a representation of the electrons in excited state and releasing energy, it supports the bohr model.

If you neglected to rinse the silver chloride precipitate, the percentage of silver in the alloy would be…

too high

if you lost a small amount of the silver chloride precipitate, the percentage of copper in the alloy would be…

too high

Why is it necessary to wash the precipitate?

We want to be sure to get all the precipitate into the beaker to get an accurate measure. (It' doesn’t exactly matter if H2O gets poured in because the alloy wouldn’t react with it, it’s insoluble.