1. Use the following questions to fill in the table of properties: Which of these are magnetic? Float in water? Sink in water ? Dissolve in water ? Properties: Sand, Iron Fillings, Salt, Plastic Beads

magnetic- Iron Fillings

Sink in water- Sand

Dissolve in water- Salt

Float in water- Plastic Beads

Explanation:

A general guiding principle that will determine what objects will sink or float in water is this; when the weight of an object is greater than the weight of an equal volume of water, that object is denser than water hence it will sink in water. Similarly, when the weight of an object is less than the weight of an equal volume of water ,then that object is less dense than water hence it will float in water. Thus sand sinks in water (more dense than water) while plastic beads float in water (less dense than water).

Iron fillings are attracted by magnets hence they are magnetic while salt dissolves freely in water since it is an ionic substance.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.