If the electronegativity difference between element  “A” and element “B” is 0, what type of bond is formed between the two elements?

Increasing the pressure of a fixed amount of gas at constant temperature has what effect on the volume of the gas? (Response should be one of the following: increases, decreases or no effect)

The correct formula of an ionic compound containing Fe+3 and (ClO4)-1 is

Refer to the structural formula given below:  Is this molecule polar or nonpolar? 

What happens to the temperature of water during a phase change? (Response should be one of the following: increases, decreases, stays constant)

What is the freezing point of water in °C?

In a oxidation-reduction reaction, the reducing agent is:

Which of the following choices best classifies the following reaction:  Na2(SO4)   +   Pb(NO3)2    Pb(SO4)  +  2 Na(NO3) a. combination b. single replacement c. decomposition d. double replacement  e. redox f.  nonredox

Which response includes all the following statements about gases that are true? a. the particles of a gas occupy a definite shape b. a gas can be compressed into a very small volume c. at normal temperatures and pressures, the particles of gases are very far apart d. heating a sample of gas forces the particles closer together e. there are virtually no forces of attraction between gas molecules  

The change from the liquid state to the vapor state that occurs only at the surface of the liquid is called ____.