Why are unused chemicals never returned to thier original containers?

A 10 g sample of ice, at - 11 is mixed with 90 ml of water at 80. calculate the final temperature of the mixture assuming that no heat is lost to the surroundings. The heat capacities of H2O (s) and H2O (I) are 2.08 and 4.

Calculate the energy E of a sample of 3.50 mol of ideal oxygen gas (O2) molecules at a temperature of 310 K. Assume that the molecules are free to rotate and move in three dimensions, but ignore vibrations.

Benzamide is less easily hydrolysed than methyl benzoate

Would the atomic emission spectra of cobalt be the same on Earth as on the moon? Explain.

How is the rotation of the sun different from the rotation of earth

Why are oceans salty

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous Endothermic

Explain in terms of electrons why the bonding in NaCl is ionic. 2Na (s) + Cl2 (g) - >2NaCl (s)

A 20% solution of KCl has a mass of 400 g what mass of KCl is contained in this solution

A fire extinguisher is labeled b-i. what type of fire will be put out by this extinguisher?