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2 years ago

Please help I will give brainiest‼️‼️‼️‼️‼️‼️‼️

Chemistry

1 answer:

telo118 [61]2 years ago

7 0

The scientific method is the method used for scientific discovery.

<h3>What is the scientific method?</h3>

The scientific method is the process or procedure which scientists follow in their discovery and explanation of natural phenomena.

The scientific method is as follows:

Observations/Questions
Hypothesis
Experiments
Results
Conclusions

Using the scientific method to determine if water is needed by plants to grow

Question: Is water needed for growth in plants?

Hypothesis: Plants need water

Independent variable: sunlight

Dependent variable: rate of evolution oxygen

Constant variable: sunlight and soil

Materials: Cupboard, soil, potted plant, water,

Procedure: One potted potted plant is watered, while the other is not watered. The length of the plant is measured after 10 days

Observation: The watered plant survived and grew while that which was not watered did not grow but died.

Conclusion: water is needed for growth in plants.

In conclusion, the scientific method can be used to determine if plants need water for growth.

Learn more about scientific method at: brainly.com/question/17274244

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A teapot with a surface area of 785 cm2 is to be plated with silver. It is attached to the negative electrode of an electrolytic

lina2011 [118]

Answer:

Given info: The surface area of teapot plated with silver is 700 cm2700 cm2, the cell is powered by 12.0-V12.0-V, the resistance of the cell is 1.80 Ω1.80 Ω, thickness of silver layer is 0.133-mm0.133-mm and density of silver is 10.5×103 kg/m310.5×103 kg/m3.

Write the expression for the mass of the silver.

m=ρAdm=ρAd (1)

Here,

ρρ is the density of silver.

AA is the surface area.

dd is the thickness of the silver layer.

Substitute 10.5×103 kg/m310.5×103 kg/m3 for ρρ, 700 cm2700 cm2 for AA and 0.133-mm0.133-mm for dd in equation (1) to find mass of the silver.

m=(10.5×103 kg/m3)(700 cm2(10−21 cm)2)(0.133-mm(10−3 m1 mm))=0.0978 kg(103 g1 kg)=97.8 gm=(10.5×103 kg/m3)(700 cm2(10−21 cm)2)(0.133-mm(10−3 m1 mm))=0.0978 kg(103 g1 kg)=97.8 g

Thus, the mass of silver is 97.8 g97.8 g.

Write the expression for number of moles of silver.

n=mWan=mWa (2)

Here,

mm is the mass of silver.

WaWa is the atomic weight.

The atomic weight of silver is 107.8 g/mole107.8 g/mole

Substitute 97.8 g97.8 g for mm, and 107.8 g/mole107.8 g/mole for WaWa in equation (2) to find number of moles of silver.

n=97.8 g107.8 g/mole=0.907 moln=97.8 g107.8 g/mole=0.907 mol

Thus, the number of moles of silver is 0.907 mol0.907 mol.

7 0

4 years ago

How many atoms are in one compound of sodium nitride?

Ksju [112]

Https://www.google.com.eg/url?sa=t&source=web&rct=j&url=https://socratic.org/questions/what-is-the-formula-for-sodium-nitride&ved=2ahUKEwjJnpa1mPDeAhUJC-wKHdjPBHcQFjAMegQIBhAB&usg=AOvVaw0UEeq0hYocDWBqSrv3H9Wf

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4 years ago

Read 2 more answers

What are 2 facts about Lysosome

Aleonysh [2.5K]

<span><span>The Lysosome organelles <span> have several dozen of enzymes in each one.</span>
</span><span> The word "Lysosome" comes from two Greek words. One, "Lysis" meaning destruction and two, "Soma" meaning body
</span><span>There is really no way for a lysosome organelle to malfunction execpt if the cell starts eating to much and there are not enough lysosomes to digest all of the food. Which leeds up to the cell not being able to eat anymore.</span></span>

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3 years ago

What is the chemical formula : hydrogen and chlorine ?

elixir [45]

Answer:

HCl

Explanation:

4 0

3 years ago

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In the solution containing both 0.10 M acetic acid and 0.10 M sodium acetate, the acetic acid undergoes ionization. The chemical

Sedbober [7]

Answer:

percent ionization = 50.01%; pH = 4.75

Explanation:

To solve this question we must write the acetic acid equilibrium (Where HX will be acetic acid and X⁻ the sodium acetate):

HX(aq) ⇄ H⁺(aq) + X⁻(aq)

Where equilibrium constant, Ka, is defined as:

Ka = 1.76x10⁻⁵ = [H⁺] [X⁻] / [HX]

<em>Where the concentration of each ion is:</em>

[H⁺] = X

[X⁻] = 0.10M + X

[HX] = 0.10M - X

Replacing in Ka expression:

1.76x10⁻⁵ = [X] [0.10-X] / [0.10+X]

1.76x10⁻⁶ + 1.76x10⁻⁵X = 0.10X - X²

X² - 0.0999824 X + 1.76×10⁻⁶ = 0

X ≈ 0.1M → False solution. Decreases a lot the concentration of HX

X = 0.0000176M → Right solution.

The concentration of each ion is:

[H⁺] = 0.0000176062M

[X⁻] = 0.10M + 0.0000176M = 0.1000176M

[HX] = 0.10M - 0.0000176M = 0.0999824M

Percent ionization:

[X-] / [X-] + [HX] * 100 =

0.1000176M / 0.2M =

And pH = -log [H+]

As you can see, [H+]≈ Ka

3 0

3 years ago