Often we will ask that you scale your procedure up or down, meaning we will change the amounts of material we will use. The following is a procedure as written in an organic lab experiment. Write the procedure out as if you were asked to scale up by a factor of 2. Make any necessary changes to equipment sizes, reaction times, etc. Remember that you should never heat a reaction vessel that is more than 1/2 full. In a 50 mL round-bottom flask place 2 grams of compound X and 15 mL of benzene. Reflux the reaction for 30 minutes. After the reaction has cooled, add 10 mL of ice-cold water. Collect the product by vacuum filtration and wash it with two 10 mL portions of ice-cold water.

he would use the colour black

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

gas

explanation:

smoke is the matter of a gas