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love history [14]

3 years ago

10

(01.01 MC)

2 answers:

Anestetic [448]3 years ago

6 0

Answer: Number of plants

Explanation:

In an experimental procedure an independent variable is the variable which can be manipulated or changed manually the effect of such changes can be observed on the dependent variable. The dependent variable is the outcome of the experiment.

According to the situation, carbon dioxide levels in the ocean water is the independent variable the effect of which can be observed on the number of plants that grow in the ocean. Number of plants that will grow in the ocean after the carbon dioxide levels increase or decrease will be the outcome of the study. Therefore, number of plants is the dependent variable.

mojhsa [17]3 years ago

4 0

Remember that a dependent variable is a variable that is being measured in a experiment so in this case your answer would be option C "plant height." Since how they are measuring plants height.

Hope this helps!

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Protons and neutrons are found in the nucleus. these two types of charges are referred to collectively as _____

solmaris [256]

Answer:

Nucleon

Explanation:

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3 years ago

In a constant‑pressure calorimeter, 70.0 mL of 0.350 M Ba(OH)2 was added to 70.0 mL of 0.700 M HCl. The reaction caused the temp

asambeis [7]

Answer:

ΔH = 57 Kj/mole H₂O

Explanation:

6 0

3 years ago

Read 2 more answers

Please help me with this. (: I'd appreciate it.

Soloha48 [4]

Answer:

The answer to your question is: ΔH = -283 kJ/mol, first option

Explanation:

Reaction

CO + O₂ ⇒ CO₂

ΔH = ∑H products - ∑H products

ΔH = -393.5 - (-110.5 + 0)

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4 0

3 years ago

A water treatment plant applies chlorine for disinfection so that 10 mg/L chlorine is achieved immediately after mixing. The vol

Vlada [557]

<u>Answer:</u> The mass of chlorine needed by the plant per day is $9.4625\times 10^8mg$

<u>Explanation:</u>

We are given:

Volume o water treated per day = 25,000,000 gallons

Converting this volume from gallons to liters, we use the conversion factor:

1 gallon = 3.785 L

So, $\frac{3.785L}{1\text{ gallon}}\times 25,000,000\text{ gallons}=9.4625\times 10^7L$

Amount of chlorine applied for disinfection = 10 mg/L

Applying unitary method:

For 1 L of water, the amount of chlorine applied is 10 mg

So, for $9.4625\times 10^7L$ of water, the amount of chlorine applied will be $\frac{10mg}{1L\times 9.4625\times 10^7L}=9.4625\times 10^8mg$

Hence, the mass of chlorine needed by the plant per day is $9.4625\times 10^8mg$

6 0

3 years ago

What pressure is required to achieve a co2 concentration of 7.90×10−2 m at 20∘c?

Savatey [412]

Answer:- 1.90 atm

Solution:- It is based on combined gas law equation, PV = nRT

In this equation, P is pressure, V is volume, n is moles of gas, R is universal gas constant and T is kelvin temperature.

If we divide both sides by V then:

$P=\frac{nRT}{V}$

We know that, molarity is moles per liter. So, in the above equation we could replace $\frac{n}{V}$ by molarity, M of the gas. The equation becomes:

P = MRT

T = 20 + 273 = 293 K

M = $7.9*10^-^2$

Let's plug in the values in the equation:

P = $(7.9*10^-^2)(0.0821)(293)$

P = 1.90 atm

So, the pressure of the gas is 1.90 atm.

7 0

3 years ago