The half life of a certain substance is 28 years. how long will it take for a sample of this substance to decay to 78% of its orginal amount.

How does cutting a substance make it dissolve faster? A. increases the surface area B. makes the particles move faster C. increases the amount of solute

What is calorimetry

Scoring: Your score will be based on the number of correct matches minus the mumber of incorrect matches.

Consider the following intermediate chemical equations. What is the enthalpy of the overall chemical reaction -205.7 kJ -113.4 kJ -14.3 kJ 78.0 kJ

If you rub a balloon on a piece of fabric or carpeting and then hold it against your head, your hair can stand on end. Why?

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution

Balance the following equation with the smallest whole number coefficients. Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". RbOH + H3PO4 → Rb3PO4 + H2O

What is the temperature of 100 liter container having 1 mole of an ideal gas at a pressure of 20 kilopascals

5.2*10^26 molecules of ch4 in volume

Which of the following statements about igneous rocks is correct A. intrusive igneous rocks are formed when magma is called above the ground. B. Extrusive igneous rocks are formed when magma is cooled above the ground C.