i need help with scientific notation. this is the decimal notation form help.​

The rate of effusion of H₂ : 7.2 x 10⁻² m/s

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or  

the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

or  

[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]

MW₁ O₂ = 32 g/mol

MW₂ H₂ = 2 g/mol

[tex]\tt \dfrac{1.8\times 10^{-2}}{r_2}=\sqrt{\dfrac{2}{32} }\\\\\dfrac{(1.8\times 10^{-2})^2}{r_2^2}=\dfrac{2}{32}\\\\r_2=0.072=7.2\times 10^{-2}~m/s[/tex]

Answer:

I do believe the answer is false.

Hope This Helps!!

Answer: F

Explanation:

Brainlist me

Answer:

B. mass and height have the same effect on gravitational potential energy.

Explanation:

Both mass and height have the same effect on the gravitational potential energy of body.

Gravitational potential energy is the energy of a body due to that of another body. It usually the energy at rest in a body.

It is mathematically expressed as;

 G.P.E  = m x g x h

m is the mass

g is the acceleration due to gravity

h is the height

We see that both the height and mass are directly proportional to the gravitational potential energy and as such, they have the same effect.

Answer:

Both are small

Explanation:

Atom comprises to die molecules, and cell comprise to for tissues

Answer:

D

Explanation:

Answer:

E = 3.035× 10-¹⁹J = 1.9eV

f = 4.58 × 10¹⁴Hz

Explanation:

wavelength = 6.55 × 10-⁷m

c = 3 × 10⁸m/s

f = ?

E = ?

a) f = c/wavelength

f = 3 × 10⁸/6.55 × 10-⁷

f = 4.58 × 10¹⁴Hz

b) E = hc/wavelength

E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷

E = 3.035 × 10-¹⁹J

1ev = 1.6 × 10-¹⁹J

Therefore E = 3.035/1.6 = 1.9eV

Answer:

7 mol Fe

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

RxN:     Zn (s) + FeSO₄ (aq) → ZnSO₄ (aq) + Fe (s)

Given:   7 moles Zn

Step 2: Stoichiometry

[tex]7 \ mol \ Zn(\frac{1 \ mol \ Fe}{1 \ mol \ Zn} )[/tex] = 7 mol Fe

Step 3: Check

We are given 1 sig fig.

Since our final answer is in 1 sig fig, there is no need to round.

Answer:

1. 4

Explanation:

there are four atoms of hydrogen. you can tell because there is a 4 after the H.

Answer:

500N/m²

Explanation:

The Pressure can be calculated using the formula:

P = F/A

Where;

F = force (N)

A = Area (m²)

Based on the information provided in the question, F = 30N, A = 0.06m²

P = F/A

P = 30/0.06

P = 500N/m²

Answer:

Eggs Frying

Explanation:

;)

Answer: Yes

Explanation:

Answer:

a

Explanation:

A world map showing the Principal World Air Masses. The four major types of air masses are noted on the map. The maritime polar has formed immediately north of Antarctica in the image.

The north Pacific Ocean produces the majority of the maritime polar air masses that affect the United States. However, maritime polar air occasionally forms in the North Atlantic Ocean and moves into the New England states.

In the winter, for example, an arctic air mass can move over the ocean, picking up some warmth and moisture from the warmer ocean and transforming into a maritime polar air mass (mP), which is still fairly cold but contains moisture.

In the image, the maritime polar has formed immediately north of Antarctica. The temperature of mP air varies between just above freezing and below 70 degrees Fahrenheit. As it moves over elevated terrain, mP air changes. Mountain ranges on the windward side

Thus, The maritime polar has formed immediately north of Antarctica in the image.

To learn more about the maritime polar, follow the link;

https://brainly.com/question/7423218

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Answer:

In general, hot wet climates accelerate chemical weathering while cold dry climates accelerate physical weathering. Although the rate of weathering depends on the type of rock, rocks in tropical climates experience the highest rates of weathering because of the combination of high heat and heavy rainfall.

Answer:

4 valence electrons.

Explanation:

Answer:

anawer is none of the above

Answer:

i think none of the above is the answer

Answer:

Explanation:

  3BaBr₂       +       2Na₃PO₄     =       6BaBr + Ba₃(PO₄)₂ (s)

3 x 297 = 891 gm                                          1 x 602 = 602 gm

891 gram of BaBr₂ yields     602 gram of precipitate

15.2 gram of BaBr₂ yields     602 x 15.2 / 891 gram of precipitate

= 10.23 gram

actual yield = 9.5 gram

percent yield = 9.5 x 100 / 10.23

= 92.86 % .

Answer:

Wasim and Nehra did the Proper testing  

Explanation:

In acidic condition Blue litmus turns red

In basic condition Red litmus turns Blue

In order to test an Acidic solution we need Blue litmus.

Wasim Dipped the blue litmus in the solution : it will turn red and shows acid

Akram  Dipped the red litmus in the solution : No it will not show, it's a test for base

Neha: Dipped both the blue and the red litmus in the solution one after other.

          Blue litmus will turn red which will show Acidic nature, after that Adding Red litmus in it will not show any change as Red litmus only changes in Basic condition.

Therefore,  Wasim and Nehra did the Proper  testing  

Answer:

Rosalind Elsie Franklin (25 July 1920 – 16 April 1958)was a British biophysicist and X-ray crystallographer who made critical contributions to the understanding of the fine molecular structures of DNA, RNA, viruses, coal and graphite. The DNA work achieved the most fame because DNA (deoxyribonucleic acid) plays essential roles in cell metabolism and genetics, and the discovery of its structure helped scientists understand how genetic information is passed from parents to children.

rosalindfranklin

Franklin is best known for her work on the X-ray diffraction images of DNA which led to discovery of DNA double helix. Her data, according to Francis Crick, was "the data we actually used" to formulate Crick and Watson's 1953 hypothesis regarding the structure of DNA.Franklin's X-ray diffraction image confirming the helical structure of DNA were shown to Watson without her approval or knowledge. Though this image and her accurate interpretation of the data provided valuable insight into the DNA structure, Franklin's scientific contributions to the discovery of the double helix are often overlooked. Unpublished drafts of her papers (written just as she was arranging to leave King's College London) show that she had independently determined the overall B-form of the DNA helix and the location of the phosphate groups on the outside of the structure. However, her work was published third, in the series of three DNA Nature articles, led by the paper of Watson and Crick which only hinted at her contribution to their hypothesis.

After finishing her portion of the DNA work, Franklin led pioneering work on the tobacco mosaic and polio viruses. She died in 1958 at the age of 37 from complications arising from ovarian cancer.

Answer:

[tex]Speed = 670.56 \frac{m}{min}[/tex]

Explanation:

Given

[tex]Speed = \frac{25 mi}{hr}[/tex]

Required

Convert to meters per minutes

[tex]Speed = \frac{25 mi}{hr}[/tex]

Start by converting the speed from miles to meters

[tex]1\ mile = 1609.34\ meters.[/tex]

So, we have:

[tex]Speed = \frac{25 * 1609.34\ m}{hr}[/tex]

[tex]Speed = \frac{40233.5\ m}{hr}[/tex]

Next, we convert time from hours to minutes

[tex]1\ hour = 60\ minutes[/tex]

So, we have:

[tex]Speed = \frac{40233.5\ m}{60\ min}[/tex]

[tex]Speed = 670.56 \frac{m}{min}[/tex]

Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes

Answer:

An atom becomes charged when there is an unequal amount of positive and negative particles in the nucleus.

An atom gets a positive charge when there is an increase in protons or a decrease in electrons, such that there are more protons than electrons in the nucleus.

An atom gets a negative charge when there is an increase in electrons or a decrease in protons, such that there are more electrons than protons in the nucleus.

An atom can get a charge with a change of particles in the nucleus if that change results in an uneven number of protons and electrons.

Explanation:

Because protons are positively charged particles and electrons are negatively charged particles, a neutral atom has an equal amount of protons and electrons, so that the opposite charges of the particles cancel each other out.

However, if there is an unequal amount of protons or electrons in the nucleus, the charge of the particles will no longer be canceled out, and the atom as a whole will take on a positive or negative charge.

Answer:

Carbondioxide, water and ATP

Explanation:

The reaction is called aerobic respiration because oxygen from the air is needed for it to work.

Answer:

Cl is more likely to than Na

Explanation:

The question asks for the element more take up an electron from the other

The ability of an atom to take take or give electrons in a chemical reaction, depends on its electron affinity and ionization energy, respectively

Chlorine, Cl, has the highest electron affinity in the periodic table which makes it attract electrons more towards itself

Sodium, Na, has a low ionization energy (about 2/5 of that of chlorine) than chlorine, Cl, making sodium more readily able to give its valence electron in a reaction

Therefore, Cl is more likely to take up an outer electron from Na.

Answer:mark as brainliest

Explanation:H2SO4 and anhydrous calcium chloride CaCl2 are not used to dry ammonia because they react with it. The gas is passed through fresh quicklime (solid calcium oxide lumps) to effectively dry it.

Answer: Lithium fluoride is an inorganic compound with the chemical formula LiF.

Answer:

The chemical formula for lithium fluoride is LiF. I hope this helps

Explanation:

It suggests that the extranuclear part consists of electrons in specific spherical orbits around the nucleus.

Answer:

it's the third one

Explanation:

in the first one oxygen molecules aren't balanced

the second ok me oxygen isnt balanced

and the fourth one hydrogen isn't balanced

hope it helps ;)

A balanced equation is a representation in which the coefficients of the individual atoms of a molecule or compound are the same on both the left and right of the equation.

The correct answer is:

Option C. Zn + 2 HCl -------->  ZnCl₂ + H₂

This can  be explained as:

Therefore zinc and hydrochloric acid reaction are balanced.

To learn more about balancing the reactions follow the link:

https://brainly.com/question/14263388