Compare and contrast topsoil and sub soil

Which of the following is an exothermic reaction? A) dissolving ammonium nitrate in water to cool the water B) dissolving sugar in water C) melting ice D) oxidation of iron Which of the following is an exothermic reaction?

Which organic compound is unsaturated? (1) 2-methylbutane (3) 2-hexanol (2) 2-chloropropane (4) 2-pentene

How many atoms are in a 176 gram sample of nickel

List 3 examples of pure substances

A penny has a total mass of 3.1 grams. Zinc makes up 2.9 g of the penny. What is the percentage of zinc in the penny?

Which of the following combinations of information would allow you to calculate concentration in ppmv? Check all that apply.

The reaction between iron (II) oxide and carbon monoxide produces iron and carbon dioxide. How many moles of iron can be obtained when 4.754.75 mol FeOFeO reacts with an excess of COCO

Suppose on an average day air contains 6.5 mg of carbon monoxide per 1000 m 3 3 of air. How many milligrams of carbon monoxide are in a room measuring 10 ft x 10 ft x 10 ft? (1m = 3.28 ft). Do not use scientific notation.

Chlorine is used to disinfect swimming pools. The accepted concentration for this purpose is 1 ppm chlorine, or 1 g of chlorine per million grams of water.

Consider this reaction mechanism: Step 1: Mo (CO), Mo (CO) 3 + CO Step 2: Mo (CO) 3 + P (CH3) 3 + Mo (CO) P (CH3) 3 Which of these is an intermediate? o Mo (CO) 6 O Mo (CO) 5 о со o P (CH3) 3