An electromagnet works because

moving electrons generate magnetic forces
alternating current completes a circuit
a generator is powerful
electrons flow through copper wire

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Complete the following statements to describe solids, liquids, and gases. select the correct answer from each drop-down menu. a solid a definite volume and a definite shape. a liquid a definite volume and a definite shape. a gas a definite volume and a definite shape