What gives elements in a family or group similar properties?

a. the same atomic mass

b. the same number of protons in their nuclei

c. the same number of electrons in their outer energy level

d. the same number of total electrons?

You have a series of four chemical reactions (1->2->3->4). How do you calculate the triangleH2 if you know the other triangleH values? A. Triangle H2 = triangleH1 + triangleH3 - triangleH4 B. Triangle H2 = triangleH1 + triangleH3 + triangleH4 C.

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Student left a jar of water outside his home. Water can be a solid, liquid, or gas. When he put the jar side, the water was liquid. Twelve hours later, the water had changed phase and was a gas.

1) How many aluminum atoms are there in 3.50 grams of Al2O3? (a) 2.45 x 1022 (b) 2.07 x 1022 (c) 1.68 x 1022 (d) 4.90 x 1022 (e) 4.13 x 1022

A student mixes 86.3 g of water at 50.3°c with 60.9 g of water at 16.7°c in an insulated flask. what is the final temperature of the combined water?

What is the first man made organic compound synthesized in laboratory?

Express (3 x 104) (4 x 1023) in scientific notation

Use Dimensional Analysis: convert: 0.36km/sec to m/min 2.6L to cm^3 9cm to mm 7.6mm^3 to cm^3

Something occurs when a liquid changes to a gas below its surface as well as on the surface

What happens to the reaction c2h6 + 137 kj when the temperature of the reaction is increased?