These five pieces of lab equipment would hold a test tube in a beaker of boiling water above a bunsen burner
1. ring stand
2. iron ring
3. wire gauze
4. utility clamp/boss head and clamp
5. bunsen burner

To make the assembly requested, on the basis of the stand, the bunsen burner will be located.

On the stand rod, the iron ring will be placed and on it the wire gauze and the glass of water.

At a higher height of the stand rod, a clamp will be attached to support the test tube.

Explanation:

A support is a piece that consists of a base with a vertical rod on which different accessories are attached that generally must go to a high height.

A bunsen burner is an instrument for heating or combustion of any sample.

Clamps are instruments that attach to the support rod to hold other laboratory materials.

The beaker is a glass material that will contain the water of the experiment.

The assembly will be like the one in the image. Just imagine that there is a test tube in the top clamp and that there is water in the glass :)

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-