Which of the following is true about mixtures and compounds?
A.
Mixtures and compounds are both made of two or more different substances.
B.
A compound forms when different substances chemically combine to form a new substance.
C.
A mixture contains different substances that are not chemically combined with one another.
D.
all of these

What is the mass of sodium in 3 moles of sodium chloride

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

Why is the structure of molecule important to its function?