Which best describes an element? a. a pure substance b. a type of mixture c. a pure compound d. an impure substance

What is the solubility of silver chromate in parts per million?

Explain why neon is monatomic but chlorine is diatomic.

Explain how calcium (40Ca20) and flourine (19F9) became stable when they form calcium fluoride.

A voltaic cell differs from an electrolytic cell in that in a voltaic cell A. energy is produced when the reaction occurs B. energy is required for the reaction to occur C. both oxidation and reduction occur D. neither oxidation nor reduction occurs

The reaction 2NO (g) → N2 (g) + O2 (g) has a ΔH =-180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? 180.5 kJ 301 kJ 322.3 kJ 644 kJ

The bonds in the compound MgSO4 can be described as A. ionic, only B. covalent, only C. both ionic and covalent D. neither ionic nor covalent

If The mass of a box is increased and the force stay the same, determine the relationship with acceleration

A balloon contains 0.15 moles of co2 gas. how many molecules of co2 are in the balloon?

Acids A) are generally proton donors B) produce H + ions in solution C) are electron pair acceptors D) may include all of these characteristics

3.011 x 10^23 atoms F in grams