Consider the reaction

B (s) + 32O2 (g) →B2O3 (s), ΔH = - 1270kJ

What will ΔH be for the reaction if it is reversed?

Express your answer with appropriate units.

The part of a soil profile that is made up of partly weathered rock is the, bedrock subsoil, regolith, topsoil.

What mineral is this. Nearly rectangular in shape and approximately 5 cm by 7 cm in size. Blackish in color with a shiny but nonmetallic luster. Peels off in very thin, flexible sheets and crumbles rather easily.

Rock samples, taken from the Moon, contain many of the same minerals as those found on Earth. Why might this be the case?

Many protists are single-celled organisms. Which other characteristic is common to organisms in Kingdom Protista? They thrive in wet environments. They thrive in environments with little sunlight. They thrive in environments without water.

Baking soda is also known as sodium hydrogen carbonate. What is the mass of 1.00 mol of sodium hydrogen carbonate (NaHCO3) ?

What subatomic particles do the following symbols represent in the atomic diagrams

2. You have 2 m3 of a mineral ore sample. It has a mass of 1 * 104 kg. Calculate the density of the ore sample and express your results in g/cm3 with appropriate scientific notation.

A sample of hydrogen was collected by water displacement at 23.0°C and an atmospheric pressure of 735 mmHg. Its volume is 568 mL.

What is loamy soil?

What is the lowest possible value of n for a d atomic orbital?