The half-life of strontium-90 is 28 years. how long will it take a 52 mg sample to decay to a mass of 13 mg?

Which type of radiation is identical in mass and charge to a helium nucleus? a. beta b. alpha c. proton d. positron

What is the formula for tin (IV) chlorate?

An ion has a charge of 3+. if this ion has 8 protons, how moany electrons does it have? A 3 B 5 C 7 D 8 E 11

Carbon dioxide can be formed from the reaction of carbon monoxide and oxygen. How many moles of carbon monoxide must be reacted in order to produce 147 kJ of energy? 2 CO + O2 - > 2 CO2 ΔH = - 787 kJ

If a fast moving cold air mass overtakes a slow-moving warm air mass in July, what type of weather would you predict to occur?

The molecules in a solid object A. flow freely around each other B. vibrate slowly C. are completely still all the time

How many moles of water can be obtained from the reaction of 4 moles of O2?

A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen.

C). If 0.5 mole of oxygen (0,) reacted with hydrogen (H2), how many mole of water (H, 0) was produced from the reaction?

A cube has a depth of 10 cm. What is the volume of the cube? Or What is depth?