Why might a rubber raft burst if it is left in the sun on a summer day?

The mass of a single lead atom is 3.44*10-22 grams. How many lead atoms would there be in 85.9 milligrams of lead?

How much 0.02 m kmno4 solution should be needed if the solutions tested have a composition of 3% h2o2 by mass?

Identify and define 3 parts of an animal cell

In order for work to be done on an object, what must happen to the object?

When an electron jumps from a high energy state to a lower state, what form does the emitted energy take?

A student makes ice cream using an old-fashioned hand-crank machine. He does 40 joules of work each time he turns the crank in a complete circle. The crank handle makes a circular path with a diameter of 0.5 meters.

Which statement is true about molecules and compounds? Question 7 options: Both are made of two or more elements. Both are made of only one element. Both are made of only one kind of atom. Both are made of two or more atoms.

Which reaction is endothermic? H2 (g) + ½ O2 (g) → H2O (g), ΔH = - 57.82 kcal ½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g) ½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcal C (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal

If a temperature increase from 10.0 ∘C to 21.0 ∘C doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction

Chlorine released from chlorofluorocarbons (cfcs) reacts with ozone in the atmosphere to form oxygen. the proposed reactions are cl (g) + o3 (g) →clo (g) + o2 (g) clo (g) + o (g) →cl (g) + o2 (g) identify the species that acts as a catalyst and the