Other Chemistry Answers

Explain how our body converts food to energy?

Without referring to the periodic table,name the elements,give their electronic structure and name the group in the periodic table to which the following atomic number belong
3,9,12,17,20

To calibrate a bomb calorimeter, the combustion of naphthalene (C10H8),
which releases 5150.1 kJ/mol, is often used. A sample of naphthalene of
mass 1.05-g is burned in a calorimeter, producing a temperature increase of
3.86°C. Combustion of a 1.83-g sample of coal in the same calorimeter
causes a temperature change of 4.90°C. What is the energy density of coal?

Draw the CONDENSED STRUCTURES of the products of the following reactions [TI, 9m]
a)
H2C
CH2
CH2
CH
CH2
OH
CH2 CH3
HO

Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 4.3 g of hexane is mixed with 23.0 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

3.15 moles of water are used in a chemical reaction. How many molecules are in this sample?

A sample of sodium hydroxide (NaOH) has a mass of 54.3 g. How many moles are in this sample?

What is the correct balanced formula for chromium ( IV ) oxide

How many kilograms are equal to 3.3 scruples? (In apothecaries’ measures: 1 scruple = 20 grains, 1 ounce = 480 grains, 1 gram = 0.03215 ounce)