Chemistry acids and bases

What is the percent by mass of oxygen?

How many milliliters of 0.580 M aluminum bromide solution are required to prepare 89.3 mL of a solution that is 0.233 M in bromide ion?

What is the charge on he helium atom? Explain your reasoning. (A helium atom has two electrons, two protons, and two neutrons.)

How much energy is required to melt a 500. gram block of iron? The heat of vaporization is 6090 J/g and the heat of fusion is 247 J/ g. 3.05x106 J 1.23x105 J 6.09x103 J 2.47x102 J

Write a balanced equilibrium equation for the dissolution of nai in water. include phases.

Problem 5.32 - enhanced - with feedback the rolling resistance for steel on steel is quite low; the coefficient of rolling friction is typically μr=0.002. suppose a 180,000 kg locomotive is rolling at 22 m/s on level rails.

Gina made a poster for plastic recycling week and included this information on her poster: What corrections should Gina make? Check all that apply. Gina should put "cellulose" under "Synthetic." Gina should put "plastic" under "Natural.

How is DNA linked to a person's inheritance?

Green plants take in water (H2O) and carbon dioxide (CO2) and produce glucose (C6H12O6) and oxygen gas (O2). Calculate the molar masses of carbon dioxide, glucose, and oxygen gas.

Are 3 eggs the same quantity as 3 dozen eggs?