Pollutants entering and leaving natural water treatment systems such as constructed wetlands can be evaluated by considering the concentration entering and leaving, or the mass entering and leaving. mass of the pollutant can be calculated by multiplying concentration (dimensional units of concentration - m/l) by inflow or outflow (dimensional units of volume - l). consider nitrogen enters a 10,000 m2 (1 ha) constructed wetland at 10.0 mg/l. outflow concentration of the nitrogen is 2.35 mg/l. inflow volume is 1000 m/d and outflow volume is 900 m3/d. a. what is the % reduction in concentration? (hint: % concentration reduction = (in-out)/in) * 100%) b. what is the mass of nitrogen in kilograms (kg) removed by the wetland per day (hint: mass reduction = mass in - mass out) c. what is the % reduction in nitrogen on a mass basis? d. state which calculation (concentration decrease or mass removal) you think is the best way to determine the magnitude the wetland is treating the water, and briefly explain your answer.

Which statement is true about ionic compounds?

Ab c or d ? i’m not sure what the answer is

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5