The silver reacted with the oxygen in the air, this chemical reaction caused it to tarnish.
<span>a pure substance that can be separated into different elements by chemical means</span>
I believe the answer would be D. Metallic bonding forms a “sea” of free electrons. These free electrons are able to move around much more freely than electrons in a regular lattice formation. This ability of the electrons to move around easily means that metal can be hammered into sheets or pulled into wires and still be stable. So the free electrons allow the metal to have the property if malleability.
True
Density = mass/volume
Suppose that a block has a mass of 20 g and a volume of 20 cm^3.
Density = 20 g/20 cm^3 = 1 g/cm^3
Now, you cut the block in half. The half-block has a mass of 10 g and a volume of 10 cm^3.
The density of the half-block is
Density = 10 g/10 cm^3 = 1 g/cm^3
The density <em>stays the same</em>, even though the size of the sample has changed.