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Nezavi [6.7K]
3 years ago
5

What statement is one of the three parts of a cell theory?

Chemistry
1 answer:
astra-53 [7]3 years ago
6 0

Answer:

I might be wrong but i believe the answer would be A.

Explanation:

I think its A. because:

The unified cell theory states that all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.

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A buffering solution consists of both strong acids and bases. <br> a. True<br> b. False
artcher [175]
False. A buffering solution consists of a WEAK acid such as CH3COOH, C5H5N, or ammonia. <span>A buffering solution resists pH change upon the addition of an acidic or basic components. It can neutralize little amounts of added acid or base, thus maintaining the pH of the solution relatively stable. The correct answer is letter "B. false"</span>
4 0
4 years ago
g A hydrogen atom initially in the n = 4 states emits a photon and makes a transition to the n = 2 level. What is the wavelength
Vinil7 [7]

<u>Answer:</u> The wavelength of the photon is 486.2 nm and it lies in the visible region

<u>Explanation:</u>

To calculate the wavelength of light, we use Rydberg's Equation:

\frac{1}{\lambda}=R_H\left(\frac{1}{n_i^2}-\frac{1}{n_f^2} \right )

Where,

\lambda = Wavelength of radiation

R_H = Rydberg's Constant = 1.097\times 10^7m^{-1}

n_f = Higher energy level = 4

n_i = Lower energy level = 2

Putting the values in above equation, we get:

\frac{1}{\lambda }=1.097\times 10^7m^{-1}\left(\frac{1}{2^2}-\frac{1}{4^2} \right )\\\\\lambda =4.862\times 10^{-7}m

Converting this into nanometers, we use the conversion factor:

1m=10^9nm

So, 4.862\times 10^{-7}m\times (\frac{10^9nm}{1m})=486.2nm

As, the range of wavelength of visible light is 400 nm - 700 nm. So, the wavelength of the given photon lies in the visible region

Hence, the wavelength of the photon is 486.2 nm and it lies in the visible region

6 0
3 years ago
Write and balance the equation for the dissolving of aluminium chloride into an aqueous solution with the dissociation of
umka2103 [35]

The balanced equation for the dissolving of aluminum chloride into an aqueous solution with the dissociation of the ions is; AlCl3(s) → Al^3+ (aq) + 3 Cl^-(aq).

<h3>What is an equation?</h3>

An equation is a representation of the change that occurs inside a reaction vessel. Usually, we use this tool to show on paper, a process that we can not see with or eyes.

The equation that shows the balanced equation for the dissolving of aluminum chloride into an aqueous solution with the dissociation of the ions is; AlCl3(s) → Al^3+ (aq) + 3 Cl^-(aq).

Learn more about chemical equation: brainly.com/question/20492533

6 0
2 years ago
When magnesium is ignited in air, the magnesium reacts with oxygen and nitrogen.
vampirchik [111]
51: The only coefficient is in the first one i think and it would be a 3
52: Neon (Ne)
53: Mg has a low nuclear charge so all it's electrons would be lost in the electron shell, making the ion smaller than the atom.
8 0
3 years ago
Read 2 more answers
You may want to reference (Page) Section 12.4 while completing this problem. Enter the balanced chemical equation for the comple
alexandr1967 [171]

Answer:

See explanation

Explanation:

In this question, we have to remember that in all combustion reactions we will have <u>Oxygen</u> as reactive (O_2) and the products are <u>Carbon dioxide</u> (CO_2) and <u>Water</u> (H_2O). Additionally, for the states, we will have (l) for the <u>liquid state</u> and (g) for the <u>gas state</u>. So, we can analyze each reaction:

<u>Part A.</u>

The formula for nonane is C_9H_2_0, with this in mind we can write the combustion reaction:

C_9H_2_0_(_I_)~&#10;+~&#10;O_2~->~CO_2_(_g_)~&#10;+~H_2O_(_g_)

When we balance the reaction we will obtain:

C_9H_2_0_(_I_)~&#10;+~14 O_2_(_g_)~->~9CO_2_(_g_)~&#10;+~10H_2O_(_g_)

<u>Part B.</u>

The formula for 2-methylbutane is C_5H_1_2, with this in mind we can write the combustion reaction:

C5H12_(_I_)~&#10;+~O_2_(_g_)~->~CO_2_(_g_)~&#10;+~H2O_(_g_)

When we balance the reaction we will obtain:

C5H12_(_I_)~&#10;+~8O_2_(_g_)~->~5 CO_2_(_g_)~&#10;+~6 H2O_(_g_)

<u>Part C.</u>

The formula for 3-ethyltoluene is C_9H_1_2, with this in mind we can write the combustion reaction:

C_9H_1_2_(_I_)~+~O_2_(_g_)~->~CO_2_(_g_)~+~H2O_(_g_)

When we balance the reaction we will obtain:

C9H12_(_I_)~&#10;+~12O_2_(_g_)~->~9CO_2_(_g_)~&#10;+~6H2O_(_g_)

See figure 1 for further explanations.

I hope it helps!

8 0
3 years ago
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