Carbon dioxide subliming is an example of which of the following?

O A. Mass change

O B. Chemical change

O C. Nuclear change

O

D. Physical change

When a calorimeter is used, no heat is exchanged between the contents of the container and the outside air.

What is the relationship between reaction rate and molecular equillibrium?

Chloroform, CHCl3, reacts with chlorine, Cl2, to form carbon tetrachloride, CCl4, and hydrogen chloride, HCl. In an experiment 25 grams of chloroform and 25 grams of chlorine were mixed.

All living things use energy. This is why living things must eat to continue living. Which of the following demonstrates a way in which a living thing might use its energy? A. to grow B. to respond to stimuli C. to move D. all of these

The standard enthalpy change for the reaction of SO3 (g) with H2O (l) to yield H2SO4 (aq) is ΔH∘ = - 227.8 kJ. Use the following information S (s) + O2 (g) →SO2 (g), ΔH∘ = - 296.8kJ SO2 (g) + 12O2 (g) →SO3 (g), ΔH∘ = - 98.

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.

The compound KOH is called