An object of unknown metal has the following dimensions: 4.00cm long, 1.50cm wide, and 1.40cm tall. the mass of the object is known to be 75.0g. what is the identity of the object?

The unknown metal will be Copper.

Explanation:

We are given an object of unknown metal having dimensions: 4 cm long, 1.5cm wide and 1.4 cm tall.

So, the volume of the object will be:

To identify the unknown metal, we compare the calculated density with the specific density of metals.

Now, to calculate the density of an object, we use the formula:

We are given:

Density of unknown metal = ?

Mass of unknown metal  = 75 g

Volume of unknown metal =

Putting values in above equation, we get:

The calculate density matches the specific density of Copper metal.

Hence, the object is copper metal.

the answer is c.the valence of the atoms combine .