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stellarik [79]
3 years ago
14

Eddie is performing an experiment. He asked the question what type of soil makes plants grow the fastest. He has four plants. He

gives Plant #1 with potting soil,Plant #2 with sand, Plant #3 with dirt from his yard, and Plant #4 with gravel. All of the plants are kept on the same shelf next to the window and receive the same amount of water. After 4 months, Plant #1 is 100 cm tall, Plant #2 & #3 are 115 cm tall, and Plant #4 is 12 cm tall.
What is the Manipulated Variable in this Experiment?

What is the Responding Variable?

Please help me!
Chemistry
1 answer:
Bezzdna [24]3 years ago
4 0
Manipulated variable: the types of soil
Responding variable: how much t the plants grow
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A 475 cm3 sample of gas at standard temperature and pressure is allowed to expand until it occupies a
Andrej [43]

The final temperature : 345 K

<h3> Further explanation </h3>

Given

475 cm³ initial volume

600 cm³ final volume

Required

The final temperature

Solution

At standard temperature and pressure , T = 273 K and 1 atm

Charles's Law  :

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

V₁/T₁=V₂/T₂

Input the value :

T₂=(V₂T₁)/V₁

T₂=(600 x 273)/475

T₂=345 K

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3 years ago
Which acid is the acid usually found in your stomach?
amid [387]

Answer:

A.hydrochloric acid

Explanation:

4 0
3 years ago
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol.
Brut [27]

Answer:

<em>293.99 g </em>

OR

<em>0.293 Kg</em>

Explanation:

Given data:

Lattice energy of Potassium nitrate (KNO3) = -163.8 kcal/mol

Heat of hydration of KNO3 = -155.5 kcal/mol

Heat to absorb by KNO3 = 101kJ

To find:

Mass of KNO3 to dissolve in water = ?

Solution:

Heat of solution = Hydration energy - Lattice energy

                           = -155.5 -(-163.8)

                           = 8.3 kcal/mol

We already know,

1 kcal/mol = 4.184 kJ/mole

Therefore,

= 4.184 kJ/mol x 8.3 kcal/mol

= 34.73 kJ/mol

Now, 34.73 kJ of heat is absorbed when 1 mole of KNO3 is dissolved in water.

For 101 kJ of heat would be

= 101/34.73

= 2.908 moles of KNO3

Molar mass of KNO3 = 101.1 g/mole

Mass of KNO3 = Molar mass x moles

                         = 101.1 g/mole  x  2.908

                         = 293.99 g

                         = 0.293 kg

<em><u>293.99 g potassium nitrate has to dissolve in water to absorb 101 kJ of heat. </u></em>     

4 0
3 years ago
piece of copper iron silver and gold are dropped into a solution of iron sulphate the piece that will get a coating of a copper
torisob [31]

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