What are substances that cannot be broken down into summoner subtances

What element has a half-life = to 64

A boy weighing 25 kg sits in a 1000 kg car at a speed of 15 m/s. What is the total momentum of the car and the boy? A) 375 kg m/s B) 14625 kg m/s C) 15000 kg m/s D) 15375 kg m/s

The hydrogen ions in the core of the sun move at high speed. Colliding together and sticking to each other. Proton - Proton Chain: 1) Two hydrogens collide, one becomes a neutron. Product becomes Deuterium.

How do you draw a electron dot diagram

Which water resource is most likely to dry up for part of the year?

In the reaction A + B C, doubling the concentration of A doubles the reaction rate and doubling the concentration of B doubles the reaction rate.

How much more acidic is a solution with a PH of 5 than a solution with a PH of 8?

A sealed balloon is filled with 2.20 liters of helium gas at 20.0° C. If the pressure does not change, what is the temperature when the balloon expands to a volume of 2.60 liters? 16.9° C 23.6° C 25.1° C 73.3° C

If I have a molar concentration of Na2S2O3 of. 02M and a volume of. 001L. As well as a Molar Concentration of KI. 3M and H2O2 of. 1M. The equation of the reaction is 2S2O3+I3 - >3I+S4O6. The question is "How many moles of S2O3 are consumed".

Solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas are produced when 65.4g of sodium are added to water? 2Na (s) + 2H2O (l) - - >. 2NaOH (aq) + H2 (g)