A gas sample is heated from -20.0 C to 57.0 C and the volume is increased from 2.00 L to 4.50 L . If the initial pressure is 0.140 atm, what is the final pressure? 1) -0.177 atm
2) 0.0477 atm
3) 0.0811 atm
4) 0.411 atm

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided

The semi-conductors on the periodic table are classified as

How many atomic mass units are equal to 1.672×10−24 g of protons?