Rutherford proposed the __________. nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant

The mass percent of gold in the piece is 79.08%

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

Thus,

Mass = density × volume

Mass = density × volume

Mass of gold = 19.3 × V

Mass of gold = 19.3V

Mass = density × volume

Mass of silver = 10.5 × (1.25 - V)

Mass of silver = 13.125 - 10.5V

Mass of piece = mass of gold + mass of silver

20.5 = 19.3V + 13.125 - 10.5V

Collect like terms

19.3V - 10.5V = 20.5 - 13.125

8.8V = 7.375

Divide both sides by 8.8

V = 7.375 / 8.8

Volume of gold = 0.84 cm³

Thus,

Mass of gold = 19.3V

Mass of gold = 19.3 × 0.84

Mass of gold = 16.212 g

Mass percent of gold = (mass of gold / mass of piece) × 100

Mass percent of gold = (16.212 / 20.5) × 100

Mass percent of gold = 79.08%

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Banded iron formations are made of minerals like iron-rich silicates and iron-rich carbonates.

Banded iron is the sedimentary rocks that are formed by the iron-rich contents and iron-rich carbonates and silicates. These minerals are hematite and magnetite.

The organisms that release oxygen are converted into iron oxides underwater, and they form sedimentary rocks like banded iron. The oxides are composed on the ocean floor, and they turn into rocks.

Thus, the correct minerals for banded iron formation are iron-rich silicates and iron-rich carbonates.

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carbonic acid (h2co3) is a weak acid formed when carbon dioxide dissolves in water. The ions present in a carbonic acid solution are H+ and HCO3–.

Carbonic acid is a weak acid with a chemical formula of H2CO3. In the presence of water, the partial dissociation of the carbonic acid occurs to produce H+ and HCO3– ions.

It is an inorganic compound also known as diprotic acid because it can form two types of salts; carbonates and bicarbonates. It is produced at industrial level as a by-product during the burning of the fossil fuels.

Carbonic acid is used to prepare carbonated water, sparkling wine. It can also be used to remove carbon dioxide from water.

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The numerical value of the Ksp  of [tex]BaSO_{4}[/tex] is 1.69 * 10^-20.

The Ksp is an equilibrium constant that shows the extent to which a substance is soluble in water. Now consider the fact that [tex]BaSO_{4}[/tex] is almost insoluble in water.

i) The Ksp of the [tex]BaSO_{4}[/tex] solution can be obtained from the relation;

Ksp = [[tex]Ba^{2+}[/tex]] [[tex]SO_{4}^{2-}[/tex]]

ii) The numerical value of the Ksp is obtained from; [1.30 × 10–10]^2 = 1.69 * 10^-20

iii) The reason for the toxicity of [tex]BaCO_{3}[/tex] even though it is not more soluble that barium sulfate is that [tex]BaCO_{3}[/tex] can dissolve in the gastrointestinal tract which is acidic leading to barium poisoning.

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The experiment is performed to determine the solution and the observations. Variables are the data that are present in the experiment. Temperature is the independent and solubility is the dependent variable.

Independent variables are defined by the variables that vary in the experiment and are the temperature in this case as the dissolution capability of the sugar is studied in the experiment.

The solubility of the sugar is a dependent variable as it varies based on the temperature of the beaker which affects the solubility factor. It gets altered by the temperature.

Therefore, the temperature is the independent variable.

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To prepare the HCl solution if 1% m/v HCL was available, take 2.5ml of the stock solution and makeup to mark with 7.5 ml of water.

HCl is hydrochloric acid, and it is a highly reactive and strong acid.

Given, the dilution formula

C₁V₁= C₂V₂

C₁ = initial concentration

V₁ = initial volume

C₂ = Final concentration

V₂ = final volume

The values are

C₁ = 1% m/v

V₁ = ?

C₂ = 0.25% m/v

V₂ =  10 ml

V₁  = C₂V₂/C₁

V₁  = 0.25% m/v ×  10 ml /1% m/v

V₁  = 2.5 ml

Thus, the amount of HCl is 2.5ml of the stock solution. The amount of water is 7.5 ml of water.

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Answer:

0.036g

Explanation:

I've learned about sig figs

The mass of nugget is 106.446 grams.

We are given the density and volume of the gold nugget in the question. Now, to find the mass of gold nugget, we need to relate the three quantities. The relation between them is as follows -

Density = mass÷volume

Rewriting the formula according to mass

Mass = density × volume

Converting the volume from cm³ to liters. As per the known fact,

1 liter = 1000  cm³

So, 0.00369 liters = 3.69  cm³

Keep the values in formula to find the mass

Mass = 31.4×3.69

Performing multiplication to find the mass of gold nugget

Mass = 106.446 grams

Hence, the mass of gold nugget is 106.446 grams.

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The orbitals that overlap to form the c-h bond in ethene (h2c=ch2) is  s-sp2. The correct option is d.

Orbitals are wave functions that are the places where the electrons can be found. There are different orbitals present. These are s, p, d, and f. Orbitals are of different shapes. Round orbital and eight-like shapes.

Each carbon atom is joined to two hydrogen atoms in the ethylene molecule. Therefore, for the C-H sigma bonds in ethylene, overlap two sp2-hybridized orbitals with the 1s orbitals of two hydrogen atoms.

Thus, the correct option is d. s-sp2.

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The corrcet answer is option D: About half of the buffer molecules are dissociated.

Buffers work best when about half of the buffer molecules are dissociated.

In chemistry, an aqueous solution that can resist change in pH when acidic or basic substances are added to it is called a buffer solution.

The main components of a buffer are a weak acid and a conjugate base and vice versa.

When an acid or a base is added to it, it cancels out its effects and makes the solution neutral.

In this way, it maintains a very stable pH of the solution under all conditions.

For a chemical reaction, buffers are really important and handy solutions.

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Composition in mole % is 0.091%

Given:

Copper alloy has 9.3 wt % Al2O3 = 9.3 wt/wt%

So the mol % of Al2O3 can be find by

      Mole% = w/w% / Mwt

      Mwt og Al2o3 = 101.968

      Mole% = w/w% / Mwt

                  = 9.3 / 101.96

      Mole% = 0.091%

The term "mole percent" (mol%) refers to the mole fraction in a different format. By multiplying the mole fraction by 100, the mole percent of the specified component can be calculated. Mole fraction multiplied by 100 equals Mole percent.

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When a protein of 50 nanometers is mixed with water, the opaque result is called a: suspension.

A suspension is a heterogeneous combination of two or extra substances. In it, the particles are suspended for the duration of the solution in bulk and can be easily viewed by means of bare eyes.

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A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.

Experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.

A hypothesis is an educated guess or a tentative conjecture explaining an observation or scientific problem.

According to this question, a chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change.

This suggests that a suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.

Also, the Independent variable is the temperature because it is the variable that is changed.

Dependent variable is the rate of chemical change because it is the measured variable.

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Answer:

A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.

Independent variable - Temperature

Dependent variable - Rate of chemical change

controlled variable - pressure or concentration of the reactants

The concentration gradients are established and maintained by the sodium potassium - potassium exchange pump is the concentration of potassium (k+) is found higher inside the cell (neuron) and the concentration of sodium (Na+) is found higher outside the cell.

The sodium - potassium pump is an active transport that exchange sodium ions for potassium ions.Active transport is the energy - requiring process of pumping molecules and ions across membranes , against concentration gradient.

To move molecules against the concentration gradient , carrier protein is needed.The Na / K+ pump use the energy of ATP molecule to exchange the ions.

The Na+ / K+ Pump goes through cycles to maintain a negative membrane potential.Three sodium ions exit the cell while two potassium ion enters in the cell for every single ATP consumed.

Thus , the sodium - potassium pump maintains the gradient of high concentration of N+ extracellularly and high level of K+ intracellularly.

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The formula weight of ammonium sulfate ((NH₄)₂SO₄), rounded to the nearest integer, is 132 amu

Ammonium sulfate ((NH₄)₂SO₄) formula are as follow:

((NH₄)₂SO₄)

Now,28+8+32+64  = 132gm/mol

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Answer: hope this helps :)

Explanation:

Heterogeneous:

soy sauce, pizza, fruit salad, halo halo, iced mango juice (assuming this is a mango milkshake), sago milk tea

Homogeneous:

vinegar, salt solution, sugar syrup

abno ka hahaha hatdog hamburger

Matter is anything that has mass and occupies space.

Characteristics:

1. Volume

2. Density

3. Compressibility

Answer:

magnesium

Explanation:

The correct set is N, S, and I.

The right combination is N, S, and I.

The ions of two separate elements, one of which is a metal and the other a nonmetal, make up a binary ionic combination. As a result, in binary ionic compounds, metals form cations and non-metals produce anions. As non-metals, nitrogen (N), sulfur (S), and iondine (1) produce anions in binary ionic compounds  anions.

Since Li is a metal, it cannot form an anion.

The other sets are wrong.

Being metals, Rb and Al do not form.

Sr, Ni, and other metals are not anions since they are metals.

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The number of moles in monochloro pentaborane (9) [tex]B_5H_8Cl[/tex] is 0.37056.

We know that ,

Number of moles =   Given mass/ Molar mass

Given mass of monochloro pentaborane (9) is 20.1 g

The molar mass of monochloro pentaborane (9) is

                                        =  [tex]5*B + 8*H + Cl[/tex]

                                        =  [tex]5* 10.811 + 8 * 1 + 35.453[/tex]

                                        = 54.241

Thus number of moles =  20.1/54.241

                                      = 0.37056

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The difference between ideal gases and real gases are most pronounced under conditions of inter molecular forces.

Difference between ideal gases and real gases are discussed below :

Real gases differ from ideal gases thanks to the presence of inter molecular forces, which cause the molecules of a true gas to deviate from perfect random motion.

As a result, real gases deviate from the perfect gas law at high densities and low temperatures, where the results of inter molecular forces are more pronounced.

So, the difference between ideal gases and real gases are most pronounced under conditions of inter molecular forces.

What are inter molecular forces?

The attractive forces that exist between molecules are liable for many of the bulk physical properties exhibited by substances.An inter molecular force (IMF) (or secondary force) is that the force that mediates interaction between molecules, including the electromagnetic forces of attraction or repulsion which act between atoms and other sorts of neighboring particles, e.g. atoms or ions.

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If we assume the density of water is 1.00 g/mL, the mass of water is 250 g

To find mass here density is given so we use density formula density=mass/volume

The volume of water is given but not the mass. Hence volume is converted into mass by using the density of water, which 1.0 g /ml. Therefore, Mass of water = 250 ml x 1.0 g/ml = 250 g

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Gases other than compressed air are normally supplied in pressurized cylinders at 1500 psi to 2000 psi.

What are compressed gas cylinders used for?

Cylinders of industrial compressed gas used in oxyfuel welding and steel cutting. A gas cylinder is a type of pressure container used to store and contain gases at pressures higher than atmospheric pressure.

Thus, typically, pressurized cylinders containing gases other than compressed air are delivered at pressures between 1500 and 2000 psi.

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The items can be used to control the boiling when heating liquid is in a round bottom flask are boiling chips or stones,a stir bar and stir plate.

What is Boiling?

When a liquid is heated to its boiling point, which is the temperature at which the vapour pressure of the liquid equals the pressure placed on it by the surrounding atmosphere.

Because they provide even boiling and stop the solution from boiling over, boiling stones are very helpful in chemical labs. These chips are designed to be porous in order to permit the formation of solvent vapors in the air cavities.

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Answer:soluble

Explanation: bc its less then NaOh

The final temperature of the gas is 137°C at which it must be heated to occupy the volume of 557 ml.

Given,

V₁= 371ml

V₂ = 557 ml

T₁ = 0°C or 273 okay

We ought to locate the very last temperature of the fuel that must be heated.

as the cylinder is transferring freely, the pressure is equal to the outside pressure, i.e., 1 atm, beneath all situations.

consequently, by using the use of Charles regulation, we get

V₁ / T₁ = V₂ / T₂

where V₁ and V₂ are preliminary and very last volumes

and T₁ and T₂ are preliminary and very last temperatures (in Kelvin).

accordingly, the very last temperature is

T₂ = V₂ × T₁ / V₁

Or, T₂ = 557 x (zero+273) / 371

Or, T₂ = 410 okay

Or, T₂ = 137°C

consequently the final temperature is 137°C.

The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius)

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If reaction occurs with an 73.9% yield, the mass of iron which should be reacted to produce 63.0 g of Fe₂O₃ is 59.1 g

The balanced chemical equation of the reaction is :

                   4Fe + 3O₂ → 2Fe₂O₃

Molar ratio of iron and Fe₂O₃ is 4 : 2

For a reaction having 100 % yield, every 4 mole of iron will produce 2 moles of Fe₂O₃.

So, 63.0 g of Fe₂O₃ is produced by reaction. Let's use molar mass of Fe₂O₃ , which is 159.6 g/mol to find out number of moles produced.

              moles =      63.0 g     = 0.39 mol

                             159.6 g/mol

moles of iron needed  if % yield is 100.  

= 0.39 mol x 4 mol

                      2 mol

= 0.78 mol Fe

Since given percentage yield is 73.9%, more Fe is reacted.

       % yield =    actual yield     x 100

                      theoretical yield

         73.9 % =         63.0 g           x 100

                         theoretical yield

         Theoretical yield = 85.2 g

So, to find out mass of iron reacted to theoretically produce 85.2 g Fe₂O₃

Use molar mass of Fe and mole ratio of two compounds.

        moles = 85.2 g         = 0.53 moles Fe₂O₃

                     159.6 g/mol

using this,

 = 0.53 Fe₂O₃  x     4 moles Fe    

                 2 moles Fe₂O₃

 = 1.06 moles Fe

So,

The mass of iron = ( 1.06 x 55.8 )g

                            = 59.1 g

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HTQ would be the most likely daughter cell genotype if independent assortment does not occur.

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Aerobic refers to exercise that primarily uses the oxygen-dependent energy system, oxidative phosphorylation.

Aerobic Respiration is the method of cellular respiration that takes place in the presence of oxygen gasoline to produce electricity from food. This type of breathing is frequent in most of the plant life and animals, birds, humans, and different mammals. In this process, water and carbon dioxide are produced as quit products.

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