What Is so important of air for humans beans

Which of the following is not a symbol used in chemical equations?

A 0.1250-g sample of octane (C8H18) is burned in a bomb calorimeter with a heat capacity of 5.1 * 102 J/°C. The temperature inside the calorimeter increases by 11.8 °C. What is the ΔE (in kJ/mol octane) for the combustion of octane?

Which of the following would require the largest volume of 0.100 M sodium hydroxide solution for neutralization?: (A) 20.0 mL of 0.0500 M nitric acid (B) 15.0 mL of 0.0500 M hydrobromic acid (C) 5.0 mL of 0.0100 M sulfuric acid (D) 10.0 mL of 0.

What was the robotic vehicle Opportunity designed to do? A. probe beneath the moon's surface for signs of volcanic activity B. map the contours of craters and valleys on the moon C. determine the chemical composition of rocks and soil on Mars D.

Example for transpiration?

Thirty grams of lead oxide and fifteen grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products? 10 g 15 g 45 g 450 g

The smallest unit of charge is - 1.6*10-19 C, which is the charge in coulombs of a single electron. Robert Millikan was able to measure the charge on small droplets of oil by suspending them between a pair of electrically charged plates.

An unknown material has a mass of 5 g and a volume of 7.25 cm3. What is the density of the material? Round to the nearest tenth.

How can light be emitted from an atom in ground state

What are the reproductive structures of gymnosperms