There are more than( )naturally occurring elements. Seventy-five percent of the universe is( ). The Earth’s crust and the human body are made of different elements. But( )is an element that is abundant in both. Most objects are made of( )with approximately ten million known and over( )being developed and discovered every( ).

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

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

you need to stop taking that class

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.