Which of the following is a property of a pure substance? (5 points) Select one:
a. It consists of different types of compounds.
b. It may have substances in different states of matter.
c. The ratio of the particles that make it up is fixed.
d. Its components can be separated by employing physical methods

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next