3. A student mixes a solid powder into a beaker of fluid. Which of the following would indicate that a chemical change has definitely occurred?​

Answer:

it's 50.11 trust me I know thank you

The percent by mass of iron in Prussian blue is 32.6%.

The salt called Prussian blue is a salt that is of the family of the  ferrocyanide salts. They are commonly used as dyes. This compound as it is know could be used as a blue dye in many quarters. In medicine it could be used to assist the body to expedite the elimination of certain elements or harmful chemicals from the body.

We are here mandated to obtain the percent by mass of the iron atom in the Prussian blue;

Molar mass of Prussian blue = 859

Mass of iron in Prussian blue = 5(56) = 280

Percent by mass of Prussian blue =  280/ 859  * 100 = 32.6%

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The density of 4.00 mL x 10⁻² mL of bromine (liquid) weighing 0.1249 g is 3.1225 g/mL.

Density of a liquid is defined as the mass of the substance per unit of its volume. Density is equal to the mass divided by the volume of any liquid. It is denoted by a Greek letter ρ. It is given by -

                                               ρ = m

                                                      v

where,

ρ = density

m = mass

v = volume

To calculate the density of bromine liquid,

We use,

         Density =   mass    

                           volume

         Density =  0.1249   g

                         4.00 x 10⁻² mL

         Density = 3.12 g/mL

Therefore, the density of bromine liquid is 3.12 g/mL

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According to Le Châtelier’s principle or reactions in chemical equilibrium;

2 NH₃ (g) → 3 H₂ (g) + N₂(g) : addition of N₂ shifts equilibrium to the left

N₂ (g) + O₂(g) → 2 NO (g) : addition of N₂ shifts equilibrium to the right

2 NO (g) → N₂ (g) + O₂ : addition of N₂ shifts equilibrium to the left

4 NH₃ (g) + 3 O₂ (g) → 2 N₂ (g) + 6 H₂O (g) : addition of N₂ shifts equilibrium to the left

Equilibrium in a chemical reaction refers to the point in a chemical reaction in which the rate of the formation of product from the reactants or the forward reaction is equal to the rate of formation of reactants from products or the backward reaction.

For equilibrium to be achieved in a chemical reaction the reaction must occur in a closed or isolated system.

The condition that occur in a reaction in equilibrium are described by Le Châtelier’s principle which states that for a reaction in equilibrium, the equilibrium position will shift to annul any constraint or change imposed on the system.

Considering the given reactions:

2 NH₃ (g) → 3 H₂ (g) + N₂(g) : addition of N₂ shifts equilibrium to the left

N₂ (g) + O₂(g) → 2 NO (g) : addition of N₂ shifts equilibrium to the right

2 NO (g) → N₂ (g) + O₂ : addition of N₂ shifts equilibrium to the left

4 NH₃ (g) + 3 O₂ (g) → 2 N₂ (g) + 6 H₂O (g) : addition of N₂ shifts equilibrium to the left

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The molar mass of the compound is 336.36mol

Molar mass defined as the mass of a sample of that compound divided by the amount of substance

Here given data is mass of sample = 132.0 g

Mass of nonvolatile compound =  4.300 mol = 4.300 mol ×84.16g = 361.88g

Vapor pressure of the solution = 85.00 mmHg

We have to find molar mass of compound = ?

Then we have formula is p⁰-p/p⁰ = W₂M₁/W₁M₂ where,

M2 = molar mass of sample

W1 = molar mass of compound

W2 = weight of compound

Then, 84.00-85.00/84.00 = 361.88×361.88/132.0

M2 = 361.88×361.88×84/132.0

M2 = 336.36mol

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Answer:

1+1=2

Explanation:

The temperature of the boiling water stop changing as you continue to add heat because all the heat energy is used up in changing water from liquid state to vapor state.

When we heat the water and once water  starts boiling , the heat supplied will be used in state conversion , from liquid to gaseous vapour. in other words, energy added to liquid used into breaking bonds between liquid molecules without changing the temperature.

All the energy provided in the form of heat increases the kinetic energy of particles and temperature does not increase. The boiling point of water depends on atmospheric pressure. At 1 atm the boiling point of water is 100°C.

Hence, The temperature of the boiling water stop changing as you continue to add heat because all the heat energy is used up in changing water from liquid state to vapor state.

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Answer:

an electron charge is -1

The formal charges that the atoms bear in the compounds are;

1)

a - zero

b - plus half

c- zero

2)

a - zero

b - zero

c - plus one

The formal charge has to do with the charge that an atom appears to have in a compound. We could often decode the formal charge that  compound might posses just by an intent look at the compound.

We know that the outermost shell of all the atoms in a compound ought to have eight electrons. This implies that all the atoms of elements in a compound must obey the octet rule. The atoms that do not obey the octet rule must bear a formal charge.

The formal charges that the atoms bear in the compounds are;

1)

a - zero

b - plus half

c- zero

2)

a - zero

b - zero

c - plus one

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The body of scientific knowledge is based on different Observations (Option C).

Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.

In conclusion, the body of scientific knowledge is based on different Observations (Option C).

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1409.36ml

chemist wants to make 5,748 mL of a solution with a concentration of 2.55 M. How many liters of a 10.40 M solution should be used to make this solution

from the above statement, we have got

[tex]M_1[/tex]= 2.55 M.                    [tex]M_2[/tex]=10.40 M

[tex]V_1[/tex]=  5,748 mL                     [tex]V_2[/tex]=?

now, from the formula,

[tex]M_1V_1=M_2V_2[/tex], In this M is molarity and V is Volume

now put the values in the equation,

2.55×5748=10.40×[tex]v_2[/tex]

[tex]V_2[/tex] = 2.55×5748÷10.40

[tex]V_2[/tex]= 14,657.4÷10.40

[tex]V_2[/tex]=1409.36ml

.The number of moles of solute dissolved in one liter of solution is known as the molarity, which is the concentration of a solution. it's unit is mole per litre. it is temperature dependent concentration.

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PV= nRT, The total number of moles of chlorine gas  are 140.09.

What is the mole?

PV= nRT,

T = 120 C = 120 + 273=  393 K

R = 0.08314 L . bar/ mol

P= 26.1 bar

The volume of the vessel= 18.5 L.

PV= nRT, on substituting the value of

26.1 * 18.5 = n * 0.08314 * 393 K

482.85= n* 3.24

482.85/ 3.24= n

149.0 =n

Therefore, PV= nRT, The total number of moles of chlorine gas  are 140.09.

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Answer:

Percent Composition (C)  =  71.40%

Explanation:

To find the percent composition of carbon by mass, you need to (1) calculate the molar mass of C₂₀H₂₉FO₃ (using the atomic masses of each atom in the molecule), then (2) calculate the total amount of carbon in C₂₀H₂₉FO₃ (using the atomic mass of carbon), and then (3) calculate the percent composition of carbon.

(Step 1)

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Atomic Mass (F): 18.998 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (C₂₀H₂₉FO₃):

20(12.011 g/mol) + 29(1.008 g/mol) + 18.998 g/mol + 3(15.999 g/mol)

=  336.447 g/mol

(Step 2)

Atomic Mass (C): 12.011 g/mol

Total Mass (C): 20(12.011 g/mol) = 240.22 g/mol

(Step 3)

                                                  mass of carbon
Percent Composition (C)  =  -----------------------------  x  100%
                                                 mass of molecule

                                                   240.22 grams
Percent Composition (C)  =  -----------------------------  x  100%
                                                  336.447 grams

Percent Composition (C)  =  71.40%

The compound formed is Boric/Boron Oxide B2O3

One of the boron oxides is boron oxide. It has the chemical formula B2O3 and is white, glassy, and solid. It usually always exists in the vitreous (amorphous) form, but with sufficient annealing, it can crystallize. One of the most challenging chemicals to crystallize is this one. Boron oxide is a highly insoluble, thermally stable source of the element that can be used in ceramic, glass, and optical applications.

Oxide compounds are not electrically conductive. Some perovskite structured oxides, on the other hand, are electronically conductive and find use as the cathode in solid oxide fuel cells and oxygen production systems. They are mixtures with at least one metallic cation and one oxygen anion. reactions.

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The process that completes the way that the the federal budget is created is that executive agencies submit budget requests.

The budget refers to the way in which the expenditure of the government is to be run in the coming year. It is customary that the executive must present their budget to the legislative arm of the government for consideration. It must be noted that the budget that has been drafted by the executive arm of government could only be passed into law by the legislative arm.

It is important to note that the legislative arm of government is composed of both the senate and the congress and the both chambers of the legislature must have to individually pass the appropriation bill before it could be passed into law by the president.

Hence, the process that completes the way that the the federal budget is created is that executive agencies submit budget requests.

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Answer:

it is A trust me I know thank you

Answer:

The marshmallow goes through a chemical change called combustion

Explanation:

Dont know if this helps but

Answer:

17,650 m

Explanation:

100 cm = 1m so, 176.5 × 100 = 17,650m

Some examples of synthetic products made from metal ores include, aluminum, cobalt, copper, gold, plastics.

Metal ores are the rocks from which metal is mostly extracted from, usually in a commercial quantity.

Also, metal ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile extracting them.

The method used to extract a given metal from its ore depends upon the reactivity of the metal and so how stable the ore is.

Examples of metal ores;

Thus, some examples of synthetic products made from metal ores include, aluminum, cobalt, copper, gold, plastics.

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The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is 2.08 atm.

In this problem, we are mandated to obtain the pressure both by the use of the ideal gas equation and then the use of the Van der Walls equation.

Using the idea gas equation;

PV = nRT

P = nRT/V

P = pressure

V = volume

n = number of moles

T = temperature

R = gas constant

P = 1 * 0.082 * (24 + 273)/0.5

P = 48.7 atm

Using the Van Der Wall equation:

P = RT/(V - b) - a /V^2

P = 0.082 * 297/(0.5 - 0.03219) - 1.345/(0.5)^2

P = 24.354/0.46781 - 1.345/ /0.25

P = 52 - 5.38

P = 46.62 atm

The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is; 48.7 atm - 46.62 atm = 2.08 atm

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-300;800 is the correct answer

Answer:

3 mol

Explanation:

According to the balanced chemical equation, on the macroscopic scale, 1 mol of Fe2O3 F e 2 O 3 reacts with 3 mol of CO .

With 25 grams of sodium chloride, 1.2 liters of a 0.35 M solution of sodium chloride may be created.

The quantity of solute dissolved in one liter of solution is known as molarity (M).

Molarity (M) is defined as the number of moles of a solute divided by the volume of the solution in litres.

M = n / v where

M stands for molarity, n for moles, and V for volume of solution.

NaCl's molar mass is 23 g/mol plus 35.5 g/mol.

= 58.5 g/mol

Now,

Given mass/molar mass equals the number of moles (n).

= 0.427

We must now determine the solution's volume.

M = 0.35 = 0.427 / v

V is 1.2 liters

Thus, 25 grams of sodium chloride might be used to create 1.2 liters of sodium chloride solution at 0.35M.

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The correct answer is: Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus; option C.

The atomic number of an element is the number of protons present in the nucleus of the atom of the element.

The nucleus is the center of the atom and is the heaviest part of the atom.

Another sub-atomic particle fund in the nucleus is the neutron.

Elements are named according to the number of protons in the nuclei.. This is because the number of protons in the nucleus of any given atom whereas the neutron number may vary, Also, electrons are easily removed from atoms of elements.

In conclusion, the number of protos in atom is used to name the atom.

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The half life of radioactive iodine 137 is 8 days 0.0866 iodine nuclei are necessary to produce an activity of 1.0 micro Ci

Here given data is half life of radioactive iodine 137 = 8days

Activity of iodine is = 1.0micro Ci

Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation and the material containing unstable nuclei is considered radioactive

The interconnection between the decay constant and half-life of any sample can be given by the expression are

T1/2 = (0.693/R); T1/2 = 8

8 = 0.693/R;  R=0.0866 R=0.693×1.0/t1/2 = 0.0866

0.0866 iodine nuclei are necessary to produce an activity of 1.0 micro Ci

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Mass of camphor is 252.47 g and mass is a measure of the amount of matter in a substance or an object

Camphor, an organic compound of penetrating, somewhat musty aroma, used for many centuries as a component of incense and as a medicinal. Modern uses of camphor have been as a plasticizer for cellulose nitrate and as an insect repellent, particularly for moths and the molecular formula is C₁₀H₁₆O

Here given data is camphor (C₁₀H₁₆0) that contains a billion (1.0 × 10°) carbon atoms

So, 1.0×10⁰ carbon atom×1 molecule of camphor/1 carbon atom

1 molecule of camphor×1 mole of camphor/Avogadro's number

1 molecule of camphor×1 mole of camphor/6.06×10²³ molecule

= 1.661 mole of camphor

1.661 mole of camphor ×152 g camphor = 252.47 g camphor

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Based on the equation of the reaction, there are two cesium atoms on the product side of the equation.

Cesium is a metallic element that is found in the group 1A of the period table.

Cesium therefore has one valence electro which it can donate to an electronegative element to form a compound wit the element.

Fluorine belongs to the group 7A of the period table known as the halogens.

Fluorine accepts one electro from an electropositive element to form a compound with the element.

The equation of the reaction between cesium and fluorine is given below:

There are two cesium atoms on the product and reactant side of the equation.

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The evidence to explain how advancements in technology influenced cell theory is the invention of microscopes. It has lead the way into the discovery of cells.

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Answer:

Electrons

Explanation:

Assuming you are talking about the nucleus of an atom, the particles surrounding the nucleus are electrons.

Atoms consist of three subatomic particles: protons, neutrons, and electrons. Protons and neutrons are located within the nucleus, whereas the electrons exist outside of it.