Cesium-137 has a half-life of 30 years. You find a sample with 3 g of cesium-137. How much cesium-137 existed in the sample 90 years ago?

What is the balanced equation for the combustion of magnesium? A. Mg (s) + O2 (g) >MgO (g) B. Mg (s) + O2 (g) >MgO2 (g) C. 2 Mg (s) + O2 (g) > 2 MgO (s) D. Mg (s) + 2 O2 (g) > MgO4^2 - (aq)

You have 255 mL of a 1.5 M solution, how much liquid do you need to BOIL AWAY to increase the molarity to 2.5 M?

Which has a larger atom calcium or barium?

a flack that weighs 345.8g is filled with 225 ml of carbon terachloride the weight of the flack and carbon terachloride is found to be 703.55g. from this information calculate the density of the carbon terachloride

three ways in which plants protect themselves from parasites.

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.

What element has the electron arrangement 2,8,4?

If you get pregnant in Dec how long will it take for u to get to second trimester

Name the following compound HClO