A mixture weighing 6.200 grams is 28.0% silicon dioxide or sand (SiO2), 36.0% sodium chloride (NaCl), and the rest being sodium bicarbonate, NaHCO3. How many grams of baking soda are present in the sample?

National Association for the Advancement of Colored People  group helped Fred Korematsu defend himself in court,

Fred Toyosaburo Korematsu (January 30, 1919 – March 30, 2005) was an American civil rights activist who opposed Japanese American incarceration during WWII. Shortly after the Imperial Japanese Navy attacked Pearl Harbor, President Franklin D. Roosevelt issued Executive Order 9066, which authorised the removal of Japanese-Americans living on the West Coast from their homes and their mandatory imprisonment in incarceration camps, but Korematsu instead challenged the orders and fled.

The validity of Roosevelt's order was maintained by the United States Supreme Court in Korematsu v. United States. (1944). However, Korematsu's conviction for avoiding imprisonment was overturned in US District Court four decades later, following the emergence of fresh information questioning the necessity of internment.

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The mass in grams of NO₂ produced from the reaction, given the data is 2.17 g

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The reactants are located on the left side while the products are located on the right side.

Reactants —> Products

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

The mass of NO₂ produced can be obtained as follow:

Balanced equation:

Cu + 4HNO₃ --> Cu(NO₃)₂ + 2H₂O + 2NO₂

1.5 + 5.95 = 4.43 + 0.85 + Mass of NO₂

7.45 = 5.28 + Mass of NO₂

Collect like term

Mass of NO₂ = 7.45 - 5.28

Mass of NO₂ = 2.17 g

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The ionic equations of the given reactions are as follows:

Ionic equations are equations which shows the ions involved in a given redox reaction as they react to form products.

The ionic equations of the given reactions are as follows:

a) precipitation of iron(III) hydroxide when solutions of sodium hydroxide and iron(III) nitrate are mixed

Molecular equation: NaOH + Fe(NO₃)₃ → Fe(OH)₃(s) + NaNO₃

Ionic equation: Na⁺ OH⁻ + Fe³⁺ 3NO₃⁻ →  Fe(OH)₃(s) + 3Na⁺ 3NO₃⁻

b) redox reaction between solution of silver(1) nitrate and magnesium metal

Molecular equation: 2 AgNO₃ + Mg → Mg(NO₃)₂ + 2 Ag (s)

Ionic equation: 2Ag⁺ 2NO₃⁻ + Mg → Mg²⁺ 2NO⁻ + 2 Ag (s)

c) acid-base reaction between sulfuric acid and potassium hydroxide

Molecular equation: H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O

Ionic equation: 2H⁺ SO₄²⁻ + 2K⁺ 2OH⁻ → 2K⁺ SO₄²⁻ + 2H₂O (l)

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Answer:

Campher freezes are in winter

Answer:  The "conversion factor" is:
___________________

"   1000 mL "  
       1 L    
___________________  

Explanation:
Note the exact values:  1 L = 1000 mL

                           and:  1000 mL = 1 L .

{Note:  " L = liter(s) " ;  and:  " mL = millileter(s) ".}.

________________________

35 L * 1000 mL  
            1 L           ;

We cancel out the 2 (two):  " L " ["Liters"] ; since:  [" L ÷ L = 1 "].

Then we can convert the value—into units of "mL" ;

 →  35 * (1000 mL) = (35 * 1000) mL =  35,000 mL.

________________________
Note that the question asks for the:

"conversion value needed to convert [35 L into mL] ;

By using the technique shown above; known as "dimensional analysis, we use that particular conversion faction—of a manner in which one multiplies by a "fraction";  so that:  
  1) the correct units for the particular value one is seeking that can be obtained—and in which the values, or more relevantly, the units —that are "not needed" can be "canceled out" ; and:
 2) The problem can be solved.
________________________
Note:  The above information is just information that provides an explanation of the concepts surrounding the "actual answer"—of this very question."

The actual answer to this Brainly question:
 As shown above:
_____________

The 'conversion factor is:
"   1000 mL "  
       1 L      

 __________
Hope this lengthy explanation—and answer—are helpful.
Best wishes!

Answer:

1000/1

Question 5 options:

Multiplying by which conversion factor would allow you to co

Explanation:

The molecular formula of trinitrogen heptoxide is written as [tex]N_3O_7[/tex].

How to calculate the molecular formula of Trinitrogen heptoxide:

Tri means three and hept means seven. Therefore,

Trinitrogen means 3 atoms of Nitrogen, thus it is denoted as [tex]N_3[/tex].

Heptoxide means 7 atoms of Oxygen, thus it is denoted as [tex]O_7[/tex].

Consequently, the molecular formula of Trinitrogen heptoxide is [tex]N_3O_7[/tex].

The type and number of each element's atoms in a molecular compound are indicated by the substance's molecular formula. The molecular formula is frequently the same as the empirical formula. Methane's empirical formula is [tex]CH_4[/tex], which is also its molecular formula because it only has one carbon atom.

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Answer:

Inner core - A

Outer core - B

Mantle - C

Asthenosphere - F

Lithosphere - E

Crust - D

There is 100.0-mL graduated cylinder containing 50.0 mL of water. The final volume reading in the graduated cylinder is 62.7 mL.

Volume is the space occupied by the three-dimensional object.

Given,

Density of liquid = 8.56 g/mL

Mass of substance = 109 g

The initial level of the water in the graduated cylinder = 50 .0 ml

To calculate the volume of a substance,

Density = mass / volume

8.56  = 109  / volume

volume = 109 / 8.56

V = 12.7 ml

The final volume reading in the graduated cylinder

50 ml + 12.7 mL = 62.7 mL

Thus, the final volume will be 62.7 mL

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28.9  grams of AlCl3 are present in 205 grams of an aqueous solution that is 13.8 % by weight AlCl3.

Aqueous is a word used to describe a water-based system. The term aqueous can also refer to a solution or combination in which water serves as the solvent. The type of a substance's chemical bonding determines whether or not it forms an aqueous solution.

When a material dissolves in water, the symbol (aq) is appended to its chemical name. Many ionic chemicals and hydrophilic (water-loving) entities dissolve in water.

Table salt, for example, is dissolved in water and diffuses into ions to generate Na+(aq) and Cl- (aq). Hydrophobic, or water-averse, substances do not dissolve in water or produce aqueous solutions. There will be no dissociation if oil and water are mixed.

The weight of the aqueous solution = is 205 grams.

Percentage of  AlCl₃  = 13.8%

Therefore, the weight of  AlCl₃  by gram =

13.8% of the solution

= 13.8 % × 205

= 28.9g

Therefore the weight of  AlCl₃  in the aqueous solution will be 28.9g

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The moles of [tex]N_2[/tex] and [tex]H_2[/tex] that were present originally in the reaction will be 1.5 moles and 2.5 moles respectively.

The two reactants,  [tex]N_2[/tex] and [tex]H_2[/tex], react in a closed container to form [tex]NH_3[/tex]. The normal stoichiometric ratio of the reaction is according to the following equation:

[tex]N_2 (g) + 3H_2 (g) --- > 2NH_3 (g)[/tex]

The stoichiometric ratio of  [tex]N_2[/tex], [tex]H_2[/tex], and [tex]NH_3[/tex] is 1:3:2.

This means for every 1 mole of ammonia formed, 0.5 moles of [tex]N_2[/tex] and 1.5 moles of [tex]H_2[/tex] is required.

However, 1 mole of [tex]N_2[/tex] and 1 moles of [tex]H_2[/tex] remained after the reaction has ceased.

Thus, total amount of  [tex]N_2[/tex] present originally = 1 + 0.5

                                                                           = 1.5 moles

Total amount of  [tex]H_2[/tex] present originally = 1 + 1.5

                                                               = 2.5 moles

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Answer:

What are often called carbon sinks like tropical forests only store carbon temporarily. The only real carbon sinks operate by the long term ...

Explanation:

the oceans and atmosphere, and dissolved organic matter is carried in solution by rivers from soils to the sea. This all constitutes the short-term carbon cycle. The word "short-term" is used because the characteristic times for transferring carbon between reservoirs range from days to tens of thousands of years.

In the short-term reservoir, carbon is stored in the atmosphere, oceans and biosphere with the ocean containing the largest amount of carbon. It takes months to centuries to recycle carbon dioxide through the short-term reservoir.

Carbon is stored in four main reservoirs -- oceans (the largest reservoir), geological reserves of fossil fuels, the terrestrial surface (plants and soil, mainly), and the atmosphere.

Answer:

Freeze thaw, salt wedging

Explanation:

Freeze-thaw weathering occurs when rocks are porous (has holes) or permeable (allows water to pass through). It is an example of Mechanical Weathering.

Another type of mechanical weathering is called salt wedging.

The mass of water evaporated is 32.7 g.

The term evaporation is the movement of the molecules of water from the surface of the water into the atmosphere. The molecules that move are the more energetic molecules that are able to break away from the attractive field of the surface of the water.

We have the original mass of the water as 455.2 g and the mass of the water after evaporation as 422.55 g. The difference between the two according to the right number of significant figures is 455.2 g - 422.55 g = 32.7 g

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The number of moles of the particles in the container is  8.4 * 10⁻⁴ moles.

The number of moles of particles of  the particle in the container is found as follows:

Mass of one atom of the particle = 62.0 ng

Mass of one atom of the particle in g =  6.2 × 10⁻⁸ g

Mass of one atom of the particle in kg = 6.2 × 10⁻¹¹ kg

Number of particles in 1 mole = 6.02 * 10²³

Mass of 1 mole of the particle = 6.02 × 10²³ × 6.2 × 10⁻¹¹ kg

Mass of 1 mole of the particle = 3.7 × 10¹³ kg

Number of moles in 3.11 * 10¹⁰ kg = 3.11 * 10¹⁰ kg/3.7 × 10¹³ kg/mol

Number of moles in 3.11 * 10¹⁰ kg = 8.4 * 10⁻⁴ moles

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Explanation:

basically first you have to understand these definitions

*mass number ( e.g. where it says oxygen 16 or 17 - it's basically that number at the top)

mass number is the 'number of protons + number of neutrons'

now this will help you do the first question

if you do 16 -8 = 8 ( that's how she got 8 neutrons)

another thing you need to know is that all the time the number of protons = the number of electrons ( they are the same)

this will help you answer table 2

for fluorine it says there are 9 electrons, you automatically have to think 9 electrons means 9 protons too, ( I think she has got that wrong, it's supposed to be 9 protons not 19)

if you have 9 protons and the given 10 neutrons and add them together you will get the mass number which is supposed to be 19

then if you try out the same rules for argon you will see they work - the number of electrons and protons are same and when you find out the protons, you can just take that away from the mass number ( which is number of protons + neutrons) to get just the number of neutrons.

Hope this helps you :)

How many sand grains make up each beach on the planet Earth?

The Earth has approximately (and we're speaking very roughly here) 7.5 x 1018 grains of sand, or seven quintillions, five hundred quadrillion grains, if you assume a grain of sand has an average size, calculate how many grains are in a teaspoon, and then multiply by all the beaches and deserts in the world.

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It's safe to suppose that after walking for around 30 seconds on a beach, you would have likely passed trillions of sand grains.

Assume a beach has medium-sized sand that is typically 0.3mm in diameter. Of course, the majority of beach sand contains some space because the grains are primarily spherical. So, for the time being, let's suppose a 23% porosity. Accordingly, a beach that is 1 square meter in size and 3 meters deep should be able to accommodate around 163 billion grains of sand. It's possible that the porosity will be as high as about 48%, but don't take my word for it; there's a mathematical maximum that I can't quite recall. The depth of sand at the beach can very much be anything up to maybe even 15-20m, and the sand grain size can vary widely. It's safe to suppose that after walking for around 30 seconds on a beach, you would have likely passed trillions of sand grains.

The complete question is -How many grains of sand are there in a given stretch of an average beach?

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J.J. Thomson sent a cathode ray between electrically charged metal plate. The aim of the experiment was to find the nature of the particles. The correct option is option D

He lighted the metal plates. A gold foil was subjected to an alpha radiation beam by B. C. In a chamber, he suspended charged oil drops. OD. He produced a cathode ray discharge between two electrically charged metal plates. All atoms include tiny, negatively charged subatomic particles that mimic electrons, as demonstrated by J.J. Thomson's cathode ray tube studies. In Thomson's "plum pudding" atom model, a negatively charged "electon" encircled a positively charged "soup."

He made the decision to attempt to identify the particle's makeup. He sought to calculate their mass and charge by measuring how much they were bent by electrical currents of various intensities because they were too small to have their mass or charge directly ascertained.

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(A) The volume of Carbon tetrachloride is 96.2 ml

(B) The density of Solid object is 3.89 g/mL

(C) The mass of water in grams is 425 gram

(A)

Molar mass of Carbon tetrachloride is 153g/mol

Density is given as 1.59g/ml

Density = mass/volume

1.59 = 153/volume

volume = 153/1.59 = 96.2 ml

Hence, volume of Carbon tetrachloride is 96.2 ml

(B)

The experiment applies Archimedes' principle, according to which the volume of a liquid that an object displaces is equal to the volume of the thing itself.

As a result, the object's displacement of volume is:

18.9 mL - 43.9 mL = 25.0 mL

The item has a capacity of 18.9 mL.

The mass divided by the volume gives the density, so:

D = m / V = 73.5 g /18.9 mL

D = 3.89 g/mL

Hence, density of Solid object is 3.89 g/mL

(C)

Volume of water in beaker = 425 ml

Density of water is 1g/ml

Density = Mass/Volume

Mass = Density x Volume = 425 x 1 = 425 gram

Hence, mass of water in grams is 425 gram

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The molar mass of the sugar is 1350 g/mol.

We define the osmotic pressure as the pressure that needs to be applied to  effect the movement of the solvent across a semi permeable membrane.

Number of moles of the sugar solution = 0.459 g/MM

Where MM = molar mass

We know that the osmotic pressure is obtained from;

π = icRT

i = Van't Hoff factor

c = concentration

R = molar gas constant

T = temperature

Let us obtain the concentration;

c = π/iRT

c =  0.0824 atm/ 1 * 0.082 * 298

c = 0.0034 M

Now;

Concentration = Number of moles/volume

Volume = 100.0 mL or 0.1 L

0.0034 = 0.459/MM/0.1

0.0034 = 0.459/0.1MM

0.0034 * 0.1MM = 0.459

MM = 0.459/ 0.0034 * 0.1

MM = 1350 g/mol

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Answer: 122 cm^3

Explanation:

2500.0 g * 1 cm^3/20.5 g=

2500.0 * 1/20.5=

2500.0/20.5=122 cm^3

The statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A

An electrolyte is a solution that is able to conduct electricity. We know that the electrolyte is able to conduct electricity because of the presence of ions in the solution. These ions are mobile charges that move in between the electrodes and make the movement of electricity possible.

If we introduce uncharged particles into this solution, they do not in anyway affect the charged particles from the electrolyte. Hence, the statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A

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The mass of oxygen in 4 moles of C2H4O2 is 128g.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.

Molar mass of C2H4O2 = 12(2) + 1(4) + 16(2) = 60g/mol

mass of C2H4O2 = 60g/mol × 4 moles = 240grams

However, the mass of oxygen in the compound can be calculated as follows:

molar mass of oxygen/molar mass of compound × 240 grams

32g/mol ÷ 60g/mol × 240g

= 128g

Therefore, the mass of oxygen in 4 moles of C2H4O2 is 128g.

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Answer:6

Explanation: a p orbital can hold 6 electrons

0.1329 moles

Air Bag Lab with a snack sized ziplock bag (325mL),  moles of gas would be needed to fill the bag

From the above statement, we have got

volume = 325ml

now at STP

Temp = 298 kelvin

pressure = 1 atm

Gas constant R = 0.082057L/mol kelvin

n is the number of moles

now, according to ideal gs equation

PV=nRT

n = PV RT

now put all the numbers in equation

n = 1 ×0.325 ÷0.082× 298

n = 0.1329 moles

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At constant temperature and volume, the average kinetic energy of the particles remains constant. The correct option is A.

An object's kinetic energy is the energy it has as a result of its motion. It is characterized by the amount of work needed to propel a body of a given mass from rest to a given velocity.

The body retains its kinetic energy after gaining it during acceleration unless its speed changes.

The average kinetic energy of a gas when its particles collide against each other at constant temperature and volume. This is valid as long as as the temperature stays the same.

Thus, the correct option is A.

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The separation methods for homogeneous and heterogeneous mixtures compared are A homogeneous mixture could be separated through distillation, while a heterogeneous mixture could be separated through filtration. The correct option is 1.

A homogeneous mixture is a mixture that contains a substance that remains homogeneous throughout the solution. The solution of salt and water is a homogeneous mixture.

Thus, the correct option is 1. Distillation can be used to separate homogeneous mixtures, while filtering can be used to separate heterogeneous mixtures.

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Answer:D

Explanation:it is true