Phosphorus is:

1 found free in the atmosphere

2 returned to the soil by rhizobium

3 added to the soil through weathering

4 usually very abundant in an ecosystem

A location in Florida has a very high rate of unemployment. A mining company plans to start limestone mining in the location.

On a trip to italy, Cheyne rented a car to tour the country. As he turned onto the highway, he noticed that the speed limit was 95 km/h. How fast can Cheyne drive im mph?

A barrel of water weighs 60 pounds. What must you put in it for it to weigh 40 pounds?

What best describes the goals of scientific investigation and technological development? Both scientific investigation and technological design aim to solve problems by making more cost products.

Which of the following statements holds true for chemical change? A) in a chemical change, no new substance is formed B) in a chemical change, a substance changes its phase C) in a chemical change, the molecular structure of a substance changes D)

A chemical engineer for a fertilizer company is determining the most efficient way to produce ammonia. the engineer carries out the haber reaction under four different conditions.

What type of Bond exist in a molecule of hydrogen Iodide

Which common material is an example of a polyamide?

A particular brand of gasoline has a density of 0.737 g/mL at 25 ∘ C. How many grams of this gasoline would fill a 12.8 gal tank (1US gal=3.78L) ?

A pump contains 0.5 l of air at 203 kpa. you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of air in the pump? 0.2 l 1.0 l 2.0 l 4.0 l