Unilt lest Unit Test Active

TIME REMAINING

01:22:52

Which shower would most likely be the control group in this

study?

Mildew is a fungus that grows in wet areas and can slowly

grow from microscopic to large stains in showers and sinks

Researchers are studying different sprays that could be used

to slow down the growth of mildew. They set up different

showers that are exactly the same and expose them each to

water with the same microscopic amount of mildew. They

then spray some showers with mildew-preventing sprays and

observe how fast mildew grows over time.

O the shower sprayed with many test sprays

the shower not exposed to any mildew at all

O the shower not sprayed with any mildew-preventing spray

O the shower sprayed with a test spray that is already

known to work

All motion is caused by force? true or false

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

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity