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3 years ago

What is the function of the cell wall in a cell

Chemistry

1 answer:

nadya68 [22]3 years ago

7 0

Answer:

To support and protect the cell.

Explanation:

The cell was (only found in plant cells) are there to help the plasma membrane and help the plant hold its structure. If the cell wall wasn't there the plant would just flop onto the ground!

-Good luck-

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) Calculating Heat from Thermochemical Equations

SIZIF [17.4K]

A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.

<h3>What is a combustion reaction?</h3>

A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:

CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol

The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.

So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol

Therefore, -3115 kJ/mol of heat is released.

Learn more about combustion reaction here:

brainly.com/question/27823881

#SPJ1

4 0

2 years ago

Use the reaction equation and bond energies to answer the question.

Arisa [49]

This problem is providing us with the chemical equation for the decomposition of water to hydrogen and oxygen, the involved bond energies and asks for the total energy of the reaction as well as whether it is endothermic or exothermic. At the end, one comes to the conclusion that it is exothermic because the total energy is -425 kJ.

<h3>Bond energy:</h3>

In chemistry, bond energies are defined as the necessary energy to break a bond between two atoms. In this case, we see that water, H2O has two H-O bonds and hydrogen and oxygen have two H-H and one O=O bonds, respectively.

Thus, we write the following heat equation, which comprises the aforementioned bond energies and the stoichiometric coefficients in the reaction:

$\Delta H=2*\Delta H_{H-O}-(2*\Delta H_{H-H}+\Delta H_{O=O})$

Hence, we plug in the given bond energies to obtain:

$\Delta H=2*467kJ/mol-(2*432kJ/mol+495kJ/mol)\\
\\
\Delta H =-425kJ/mol$

Where the negative suggests this is an exothermic reaction as it releases energy (negative enthalpy).

Learn more about bond energies: brainly.com/question/26141360

5 0

3 years ago

How many protons and neutrons does nitrogen-14 have?

zhenek [66]

Answer:

7 protons

Isotopes are atoms that have the same number of protons but different numbers of neutrons in the nucleus. You know that nitrogen-14 has 7 protons in the nucleus because it is an isotope of nitrogen, which has an atomic number equal to 7 .

4 0

4 years ago

How do waves interact with matter ?

velikii [3]

Waves interact with matter in several ways. The interactions occur when waves pass from one medium to another. Besides bouncing back like an echo, waves may bend or spread out when they strike a new medium. These three ways that waves may interact with matter are called reflection, refraction, and diffraction.

6 0

3 years ago

Calculate the molarity of 4.56 grams of NaCl dissolved in 355 ml of total solution?

alexira [117]

Answer:

0.22 mol / L

Explanation:

Please see the answer in the picture attached below.

Hope this can help you. Have a nice day !

3 0

3 years ago