Does a liquid release energy or absorb energy when it changes into a gas? into a solid?

What is an ion and what is an cation

Find the final equilibrium temperature when a 10.0 g of milk at 10.0c is added to 1.60 x 10^2 g of coffee with a temperature of 90.0 c

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.

What numbers should be placed in the boxes from left to right? 3 and 6 2 and 9 6 and 3 9 and 2

What is the mass of a steel cylinder that has a density of 75.0 g/mL and a volume of 12 mL? A. 6.25 g B. 900 g C. 87 g D. 63 g

Does skin have a nucleus true or false

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?

When a hydrogen electron makes a transition from n=3 to n=1?