Which of the following is NOT an alloy? A lead brick
A Cast Iron skillet
A Brass headboard
A Stainless Steel spoon

Hi! I believe this is your

A lead brick

Hope this helps, and sorry if it's wrong!

All are alloy

Explanation:

Spoon is made of Stainless Steel. Stainless steel is an alloy of Iron,carbon and chromium(upto 18%) , the chromium in stainless steel provides corrosion resistance .

cast iron, an alloy of iron that contains 2 to 4 percent carbon, along with varying amounts of silicon and manganese and traces of impurities such as sulfur and phosphorus

Brass is an alloy (remember, alloys are made up of different element metals) that comes in a variety of forms. Brass is generally made up of copper and zinc, but depending on the application there will be other metals inside as well. ... Beds- Many bed frames are made of decorative brass pieces.

Bricks are made of lead, with a purity of 99.985%, alloyed with 4% antimony. This formulation complies with rule UNE 37-223-83 and with the European standard (ISO 7212 - 1986 and ISO 9404 - 1991) about this subject.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l

i believe the answer is three water molecules