Which statement best describes waves? A. Waves can only travel in empty space B. Waves cannot propagate without medium C. Waves can carry energy through matter and space

Rank the ions in order of increasing basicity: CH3NH-, CH3CH2-, CH30-

Arrange the following bonds in order of increasing ionic character: carbon to hydrogen, fluorine to hydrogen, bromine to hydrogen, sodium to chlorine, potassium to fluorine, lithium to chlorine.

Is the following nuclear equation balanced? 23? Np →He + 233 AM o yes o no

Cellulose, chitin, and peptidoglycan function as structural molecules and are extraordinarily resistant to degradation and decay. which structural feature is most directly responsible?

HI (g) + CH3I (g) - > CH4 (g) + I2 (g) the rate constant is 0.28 L/Mol*s at 300*C and 0.0039 L/Mol*s at 227*C. a) What is the Activation energy of this reaction. b) What is k at 400*C

When an acid reacts with a base what compounds are formed? a. a salt only. b. water only. c. a salt and water. d. metal oxides only.?

What is the differences between River system, Tributary?

having that coloration is selected for since many predators will recognize it and stay away. Therefore the common coloration is beneficial to the butterflies and becomes more common. What type of selection is involved?

What organisms appeared on Earth First? a). gastropods b). horn corals c). brachiopods d). crinoids

Given the equation representing a reaction: 2Ca (s) + O2 (g) → 2CaO (s) During this reaction, each element changes in 1) atomic number 2) oxidation number 3) number of protons per atom 4) number of neutrons per atom