Question

I. Carbon atoms are about 25% lighter than oxygen atoms (the ratio of their weights is 3 to 4). What is the weight ratio of the carbon and oxygen that go into the formation of carbon monoxide, CO? (a) 4 parts carbon to 3 parts oxygen (b) 1 part carbon to 4 parts oxygen (c) 1 part carbon to 1 part oxygen (d) 4 parts carbon to 1 part oxygen (e) 3 parts carbon to 4 parts oxygen 2. How many atoms are in the alcohol molecule C2H5OH? (d) 11 (e) insufficient information is given 3. Which of these is a pure compound, which is an element, and which is neither: oxygen gas (O2), liquid mercury, air? (a) oxygen gas (02) - pure compound, liquid mercury - element, air - neither (b) oxygen gas (02) - element, liquid mercury - element, air - neither (c) oxygen gas (02) - pure compound, liquid mercury - element, air - pure compound (d) oxygen gas (02) - pure compound, liquid mercury - pure compound, air - element (e) oxygen gas (O2)-neither, liquid mercury-neither, air-neither 4. Helium is an inert gas, meaning that it does not readily enter into chemical reactions with other substances. List five other substances that you would expect to also be inert gases (a) carbon, aluminum, tin, potassium, mercury (b) iron, cobalt, nickel, copper, zinc (c) uranium, thorium, americium, iridium, beryllium (d) neon, argon, krypton, xenon, radon (e) silicon, oxygen, lithium, boron, tungsten 5. Chlorine has a strong tendency to combine with a single hydrogen atom to form HCl Look in the periodic table and list at least three other elements that you would expect to combine with hydrogen the way chlorine does (a) krypton, sodium, titanium (b) germanium, neon, thallium (c) bismuth, barium, argon (d) fluorine, bromine, iodine (e) helium, cobalt, chromium

Answer 1

In 1 carbon atom = 3 parts 1 oxygen atom = 4 parts so in co there is 1 carbon of 1 oxygen so 3 parts carbon 4 parts oxygen option e c_2 H_5 OH no of atoms = 2 + 5 + 1 + 1 = 9