Metals can be identified by the following physical properties:

A) ductile, good conductors, and malleable.
B) low melting and boiling points, luster, and corrosive.
C) liquid at room temperature, good conductors, and ductile.
D) high melting and boiling points, luster, and poor conductors.

Option A) ductile, good conductors, and malleable.

Explanation:

Metals can be recognised by the following physical properties:

1. They are Ductile i.e they can be used to make thin wires

2. They are good conductors of heat and electricity.

3. They are malleable i.e they can be beaten into sheets.

4. They have high melting and boiling point

5. They have characteristics lustre i.e they reflects light

Only mercury is liquid at room temperature.

From the question given above, only option A has the right combination of the physical properties of metals.

A) ductile, good conductors, and malleable.

Explanation: The physical properties of metals include the following:

1) Metals are malleable, this means that they can be beaten into sheets.

2) Metals are ductile, this means that they can be drawn into wires.

3) Metals are good conductors of heat and electricity.

4) Metals have high melting and boiling points.

5) Metals are lustrous

6) Metals have high density due to the fact that the atoms in a metal lattice are packed closely together leaving little space between them.

7) Most metals are solids at room temperature with the exception of mercury which is a liquid at room temperature.

Among the options, only option A has the right combination.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.