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Anastaziya [24]
2 years ago
13

A student conducts an experiment to determine how the addition of salt to water affects the density of the water. The student fi

lls 3 beakers with equal amounts of water. He then adds 1 cup of salt to the first beaker, 2 cups of salt to the second beaker and no salt to the third beaker. What is the dependent variable in the student's investigation?
1)The amount of salt in the water.

2)The temperature of the water.

3)The density of the water.

4)The ph of the water.
Chemistry
2 answers:
Alina [70]2 years ago
8 0
3) The density of the water depends on the amount of salt on the water, therefore it is the
dependent variable
raketka [301]2 years ago
3 0

Answer:

vyb tftrdf5rdv

Explanation:

ghyttg

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The photodissociation of ozone by ultraviolet light in the upper atmosphere is a first-order reaction with a rate constant of 1.
atroni [7]

Answer:

[O₃]= 8.84x10⁻⁷M  

Explanation:

<u>The photodissociation of ozone by UV light is given by:</u>

O₃ + hν → O₂ + O (1)

<u>The first-order reaction of the equation (1) is:</u>

rate = k [O_{3}] = - k \frac{\Delta [O_{3}]}{\Delta t} (2)

<em>where k: is the rate constant and Δ[O₃]/Δt: is the variation in the ozone concentration with time, and the negative sign is by the decrease in the reactant concentration </em>    

<u>We can get the following expression of the </u><u>first-order integrated law</u><u> of the reaction (1), by resolving the equation (2):</u>

[O_{3}]_{t} = [O_{3}]_{0} \cdot e^{-kt} (3)

<em>where [O₃](t): is the ozone concentration in the elapsed time and [O₃]₀: is the initial ozone concentration</em>

We can calculate the initial ozone concentration using equation (3):  

[O_{3}]_{t} = 5.0 \cdot 10^{-3}M \cdot e^{-(1.0\cdot 10^{-5}s^{-1}) (\frac{10d \cdot 24h \cdot 3600 s}{1d \cdot 1h})} = 8.84 \cdot 10^{-7}M

So, the ozone concentration after 10 days is 8.84x10⁻⁷M.

I hope it helps you!                    

3 0
3 years ago
A _______ is formed when tectonic plates collide.
Ivanshal [37]
A convergent plate boundary is formed when tectonic plates collide
3 0
3 years ago
What pressure will be exerted by 0.450 mol of a gas at 25°C if it is contained in a 0.650-L vessel?
iVinArrow [24]

Hey there!

The answer as well as the explanation is in the image attached. Let me know if there's anything you're unable to see.

Hope this helps!

5 0
3 years ago
A reaction involves the parts of two compounds switching places to form two new compounds. What type of reaction is this?
In-s [12.5K]

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Matt is conducting an experiment where he compares the properties of water and
NikAS [45]

Answer:

sitric acid from lemon

Explanation:

there

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3 years ago
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