Atoms of two adjacent elements in the third period are in the ground state. An atom of element A has only s electrons in its valence shell. An atom of element B has at least one p electron in its valence shell. Identify elements A and B.

How many moles of C5H12 are there in 362.8 grams of the compound

How do modern scientists describe the makeup of matter?

For which one of the following is ΔHfo zero? A. O (g) B. Na (s) C. CO2 (s) D. N2 (l)

Chemical formula for urea?

What do elements in the same family generally have similar properties?

Steve puts some cheddar cheese in a pan on the stove and starts to melt it. After a little while, there is a layer of oil floating on top of the cheese. From the way the cheese melted, Steve knows it is a A Element B Solid C Mixture D Pure Substance.

Which experimental feature of the MALDI-MS technique allows the separation of ions formed after the adduction of tissue molecules? A) Distance travelled by ions depends on the ion charge. B) Velocity of ions depends on the ion mass-to-charge ratio.

Which temperature is required for the cell potential to be the standard cell potential? A) - 273°C B) 100°C C) 25°C D) 0°C

1. the purpose of the aqueous solutions in a galvanic cell is to? a. provide ions to be oxidized and reduced b. provide a path for the free flow of electrons c. maintain charge balance in the cell d. correct any volume changes in the cell 2.

A. Identify which of the following substances dissolve in water, explaining why for each example: CH4, He, MgSO4, NaHCO3 b.