Boron is a metalloid. How many valence electrons does boron have?

A. 6

B. 3

C. 5

D. 4

Which of the following places the most sulfur trioxide in earth's atmosphere?

Consider the following balanced equation for the following reaction: 15O2 (g) + 2C6H5COOH (aq) → 14CO2 (g) + 6H2O (l) Determine the amount of CO2 (g) formed in the reaction if the percent yield of CO2 (g) is 83.

80.0 grams of NaOH is dissolved in water to make a 6.00 L solution. What is the molarity of the solution? (Molar mass of NaOH = 40.0 g/mol) - M

Determine the number of atoms in a sample of nickel that has a mass of 8.30 x 10-12 g.

How many moles are present in 1.51 x 10^23 molecules of HCl?

Identify each enthalpy change by name and classify each change as exothermic or endothermic. 1. 1 mol NaCl (s) à 1 mol NaCl (l) 2. C4H10 O (l) à C4H10O (g) 3. H2O (g) à H2O (l) 4. 1 mol NaCl (s) + 3.

Calculate the number of atoms in a 1.26*103 g sample of silicon.

A region that has a large number of atoms whose magnetic fields are lined up parallel to a magnet's field is A. the magnetosphere. B. the magnetic declination. C. a magnetic domain. D. a ferromagnetic region.

Name the element that has atoms with the same electronic structure as sulfur ion

The mass of a 2.0 centimeter sample of a substance is 3.2 grams. Calculate the density of the substance