Water vapor because it’s a gas, but you can’t see it
<span>Energy is transferred from the water into the air </span>
There are two valence electrons in a single atom of magnesium.
<span>Wrap a magnet in plastic lunch wrap and move it through the mixture of the three solids. The iron filings will stick to the magnet. The filings can be removed by unwrapping the plastic from the magnet carefully! Mix the remaining salt and sand in water and stir.</span>
