91Ó°ÊÓ

Refer to the periodic table and indicate the physical state for each of the following elements at \(25^{\circ} \mathrm{C}\) and normal pressure: (a) helium (b) manganese (c) iodine (d) mercury

State the composition for a molecule of each of the following vitamins: (a) vitamin \(\mathrm{B}_{1}, \mathrm{C}_{12} \mathrm{H}_{17} \mathrm{~N}_{4} \mathrm{OS}\) (b) \(\operatorname{vitamin} \mathrm{B}_{2}, \mathrm{C}_{17} \mathrm{H}_{20} \mathrm{~N}_{4} \mathrm{O}_{6}\)

State the composition for a molecule of each of the following compounds: (a) cholesterol, \(\mathrm{C}_{27} \mathrm{H}_{45} \mathrm{OH}\) (b) quinine, \(\mathrm{C}_{20} \mathrm{H}_{24} \mathrm{~N}_{2} \mathrm{O}_{2}\)

Write the chemical formula for each of the following compounds: (a) vitamin A: 20 carbon, 30 hydrogen, and 1 oxygen atom (b) vitamin \(\mathrm{K}: 31\) carbon, 46 hydrogen, and 2 oxygen atoms

Write the chemical formula for each of the following compounds: (a) lysine (an amino acid): 6 carbon, 14 hydrogen, 2 nitrogen, and 2 oxygen atoms (b) methionine (an amino acid): 5 carbon, 11 hydrogen, 1 nitrogen, 2 oxygen, and 1 sulfur atom

What is the total number of atoms in a molecule of each of the following compounds? (a) citric acid (in citrus fruit), \(\mathrm{C}_{3} \mathrm{H}_{4} \mathrm{OH}(\mathrm{COOH})_{3}\) (b) lactic acid (in sore muscles), \(\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{OH}) \mathrm{COOH}\)

The mass ratio of \(\mathrm{H}: \mathrm{O}\) in a bottle of water is \(1: 8 .\) Predict the mass ratio of water in 10 bottles of water.

State whether each of the following is a physical or a chemical property of gold: (a) yellow color (b) high density (c) conducts electricity (d) reacts with nitric acid

State whether each of the following is a physical or a chemical property of copper: (a) shiny metallic luster (b) high melting point (c) conducts heat (d) reacts with oxygen

State whether each of the following is a physical or a chemical property: (a) Titanium is ductile. (b) Zinc generates a gas in acid. (c) Yellow phosphorus ignites in air. (d) Chromium conducts heat.