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kondaur [170]
3 years ago
15

Scientists are studying fertilizers to help grass grow in southern California. Fertilizer is any substance that can be added to

soil to help plants grow in it. In other words, fertilizer makes soil more fertile. The scientists set up different plots of land that all use the same type of soil and grass seed, but they use different types of fertilizer in each plot. Scientists then measure the grass growth in the different soils over time.
How should scientists set up the control group in this experiment?

A - a plot with grass seed but no fertilizer in the soil
B - a plot with grass seed and many types of fertilizer in the soil
C - a plot without any grass seed or any fertilizer in the soil
D - a plot without any grass seed but with fertilizer in the soil
Chemistry
2 answers:
blsea [12.9K]3 years ago
7 0
A) plot with grads seed / no fertiliser in the soil
Andrej [43]3 years ago
6 0

Answer:

The answer should be A

Explanation:

A control is basically something to compare the experiment to. In other words, to see how the object does on its own versus how it would do with added substances

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4 0
3 years ago
A liquid with high viscosity _____ flow easily and _____ effective in wetting a surface.
scoundrel [369]

A liquid with high  viscosity does not flow easily and is not effective in wetting a surface.

When a metal is subjected to corrosive elements including salt, moisture, and high temperatures, a reaction called corrosion takes place inside the metal. Some foods contain metallic compounds that can corrode a material. The majority of corrosion is simply surface dis-colouration, which polishing agents may quickly remove.

Increasing viscosity and constant intermolecular water bonding together result in surface tension. Any liquid that was more viscous than water possessed a surface tension that was equal to or lower than that of water. Viscosity with surface tension decrease when temperature rises.

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5 0
2 years ago
what is the  concentration of a NaCl solution, in Molarity, if you add 59.76 g of NaCl into 270 mL of H2O
enot [183]

Hey there!

Molar mass NaCl = 58.44 g/mol

Number of moles

n =  mass of solute / molar mass

n = 59.76 / 58.44

n = 1.0225 moles of NaCl

Volume in liters:

270 mL / 1000 => 0.27 L

Therefore:

M = number of moles / volume ( L )

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= 3.78 M

Hope that helps!

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3 years ago
What was the oxygen crisis
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3 years ago
Question 3
hammer [34]

Answer:

in the excited state

Explanation:

Because in excited state an atom has more energy

5 0
3 years ago
Read 2 more answers
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