What is the half-life of a radioisotope if 25.0 grams of an original 200.-gram sample of the isotope remains unchanged after 11.46 days?

(1) 2.87 d (3) 11.46 d

(2) 3.82 d (4) 34.38 d

What would have been the initial pressure reading of a sample of oxygen gas that started at 25.0 mL in volume and was compressed to 15.0 mL? The final pressure reading was 1.90 atm. (Temperature was kept constant.)

Describe how an ionic bond forms as the atoms react.

An explanation as to How a catalyst works

Chlorine a. purple solution b. brown-orange liquid c. green gas d. silver-gray liquid e. yellow-orange when burned in a flame

In the last 100 years, the level of CO2 in the atmosphere has been significantly increased by man by: pesticides the burning of fossil fuels domestic heat incineration of waste products

Select the lon. O NO₂ H2SO4 O A3

True or False: A Solar eclipse occurs when Earth casts a shadow on the Moon.

To which digestione organ dose food travel it leaves the stomach

How should a stopper be handled after is has been removed from a reagent bottle?

How will increasing the pressure on the system affect this equilibrium reaction? 2H2 (g) + O2 (g) - > 2H2O (g)