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3 years ago

Explain why photosynthesis and cellular respiration are the “real circle of life”

1 answer:

4 0

Explanation:Photosynthesis is important because the earth and all of the creatures in the sea and land need the plants to be able to feed themselves with the help of the sun and with cellular respiration, those plants are able to take in the carbon dioxide that we give and make into oxygen with we need. there fore without them we would not be able to exist.

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Two 2 1/2 inch plastic strips and two 5 1/3 inch plastic stripa are used to form arectengale what is the perimter of the rectang

Ymorist [56]

Answer:The perimeter of the rectangle is $\frac{47}{3} inch$ or 15.66 inch.

Explanation:

Length of strip (I) = $2\frac{1}{2} inch=\frac{5}{2}inch$

Length of strip (II) = $5\frac{1}{3} inch=\frac{16}{3} inch$

According to question two strips of length $1 inch$ and two strips of lenght $\frac{5}{3} inch$ is used in making rectangle:

Perimeter of rectangle = Sum of all sides of rectangle

Perimeter of rectangle = $\frac{5}{2} inch+\frac{5}{2} inch +\frac{16}{3} inch+\frac{16}{3} inch=\frac{47}{3} inch$

The perimeter of the rectangle is $\frac{47}{3} inch$ or 15.66 inch.

7 0

3 years ago

Qualitative test for formaldehyde

Nuetrik [128]

Answer:

The rapid qualitative analysis method comprises that a Schiff reagent and a strong acid solution with a certain concentration are prepared, a sample and the Schiff reagent undergo a reaction, a strong acid solution is added into the reaction product and formaldehyde in the sample can be detected according to solution

Explanation:

4 0

3 years ago

How do lungfish survie in intense heat

Shalnov [3]

I believe they use Estivation

Defined: To spend a hot, dry season in an inactive, dormant state, as certain reptiles, snails, insects, and small mammals.

3 0

4 years ago

A hydrogen atom in an excited state emits a photon of frequency ν = 3.084 x 1015 s-1. If the electron returns to the ground stat

VLD [36.1K]

Answer: The photon was emitted from the 4th energy level

Explanation:

To calculate the wavelength of light, we use the equation:

$\lambda=\frac{c}{\nu}$

where,

$\lambda$ = wavelength of the light

c = speed of light = $3\times 10^8m/s$

$\nu$ = frequency of light = $3.084\times 10^{15}s^{-1}$

Putting the values in above equation, we get:

$\lambda=\frac{3\times 10^8m/s}{3.084\times 10^{15}s^{-1}}=9.73\times 10^{-8}m$

To calculate the initial level, we use the equation given by Rydberg's equation, which is:

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

where,

$\lambda$ = Wavelength of radiation $9.73\times 10^{-8}m$

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

$n_f$ = Final energy level = 1

$n_i$ = Initial energy level = ?

Putting the values, in above equation, we get

$\frac{1}{9.73\times 10^{-8}m}=1.097\times 10^7m^{-1}\left(\frac{1}{1^2}-\frac{1}{n_i^2} \right )$

$n_i=4$

Hence, the photon was emitted from the 4th energy level

4 0

3 years ago

What is the relationship between valence electrons and the number of bonds that can be formed?

nadya68 [22]

Like the previous post states, the number of valence electrons (typically the group number for nonmetals)relates directly to the number of covalent bonds available. Additionally, when you exceed this number you create a cation and when you are less the number of potential bonds, you have created a anion.

6 0

4 years ago