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3 years ago

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. a. True b. False

artcher [175]

False. A buffering solution consists of a WEAK acid such as CH3COOH, C5H5N, or ammonia. 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"

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]

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

Explanation:

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 Oxygen as reactive ( $O_2$ ) and the products are Carbon dioxide ( $CO_2$ ) and Water ( $H_2O$ ). Additionally, for the states, we will have (l) for the liquid state and (g) for the gas state. So, we can analyze each reaction: