A Geiger-Muller counter detects radioactivity by:

If an object has 6.25% of the C-14 activity, with a half-life of 5730 years, as a living organism, the age of the item is:

Consider the following endothermic equilibrium reaction: Fe2O3 (s) + 3 H2 (g) ⇌ 2 Fe (s) + 3 H2O (g)Which of the following actions will result in a shift to the left (towards reactants)?

The first experiment that converted one element to another was performed in 1919 by Ernest Rutherford. An isotope of nitrogen was bombarded with a type of particle to get an oxygen atom as shown:  N + ?  → O + H Which type of particle was used to bombard the nitrogen atom (indicated by the question mark in the equation above)?

Consider the following electronegativity values: H = 2.1 , Cl = 3.0 , F = 4.0 Which molecule below would you expect to have the most polar bond?

Consider the following endothermic equilibrium reaction: Fe2O3 (s) + 3 H2 (g) ⇌ 2 Fe (s) + 3 H2O (g)Which of the following actions will result in a shift to the right (towards products)?

Given the choice of adding ions of Mg 2+ (aq), Ca 2+ (aq), Sr 2+ (aq) or Ba 2+ (aq) to a solution of carbonate ions, CO3 2-, which choice would precipitate an insoluble carbonate compound first? Use the following Ksp data:    MgCO3  Ksp = 6.82 × 10-6 CaCO3  Ksp = 4.96 × 10-9 SrCO3 Ksp = 9.30× 10-10 BaCO3 Ksp = 5.00 × 10-9

Which compound below is the most soluble in water based on its Ksp value?

How many mL of 0.218 M sodium sulfate react with exactly 25.34 mL of 0.113 M BaCl2? Use the given balanced reaction: BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2 NaCl (aq)

Given that 4 NH3 + 5 O2 → 4 NO + 6 H2O, when 4.50 mol of H2O are formed, the amount of NO formed is: