2. When do chemical reactions happen?

O

When matter changes states

O

When water freezes into ice

O

When atoms gain, lose, or share electrons

O

When water boils

Which of these saturated solutions has the lowest concentration of dissolved ions? A) NaCl [aq] B) MgCl2 [aq] C) NiCl2 [aq] D) AgCl2 [aq]

What is the mass of 99.0 L of NO2 at STP

What mass of hydrochloric acid (in grams) is needed for the solution?

A titanium cube contains 2.86*10^23 atoms. What is the edge length of the cube? The density of titanium is 4.50 g/cm^3. (The volume of a cube is V=l^3.) Express the length in centimeters to three significant figures.

For C2H5OH (liquid) So = 161 J/K. mol; for C2H5OH (gas) So = 282.6 J/K. mol. What is ΔS if 92 g of C2H5OH is evaporated? a) 111.5 J/K b) 243.2 J/K c) 121.6 J/K d) 2.31 J/K e) - 121.6 J/K

How many additional electrons can fit into the n = 3 shell of sulfur?

In a titration, what is the name of the substance that is being determined?

What is conditioned stimulus?

Write a chemical equation representing the first ionization energy for lithium while using e as a symbol for electron.

7. How many moles of H3PO4 are there in 658 grams of H3PO4?