uppose there are 5 chemists and 10 mathematicians in a room. a) how many ways can you select six people from the room?

Answer:

1.031atm

Explanation:

Based on the nature of chemical equilibrium, the system reached equilibrium first at the time T2.

Chemical equilibrium refers to the state of a reversible chemical reaction in which the rate of forward reaction for the the formation is equal to the rate of backward reaction for the formation of reactants.

In the table of the decomposition reaction given above, the system reached equilibrium first at the time T2 when the concentration of the reactant and products were the same.

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Answer:

T3

Explanation:

I've taken the test

HNO2 has a total of 18 valence electrons. Its molecular structure is linear, consisting of one nitrogen atom (N) double-bonded to one oxygen atom (O) and also single-bonded to a hydrogen atom (H). This gives it a molecular formula of HNO2.

The nitrogen atom has 5 valence electrons, while the oxygen atom has 6 valence electrons. The hydrogen atom has only 1 valence electron. Therefore, the total number of valence electrons in HNO2 is 5 + 6 + 1 = 18.
The number of valence electrons determines the behavior of a molecule, and can be used to explain physical and chemical properties of the molecule. For example, HNO2 has a strong dipole moment because the two electronegative atoms (nitrogen and oxygen) pull electron density towards them, and the hydrogen atom pulls the electron density away. This creates a net dipole moment, which explains why HNO2 is a polar molecule. Additionally, the number of valence electrons can also be used to predict chemical reactivity. For instance, since HNO2 has 18 valence electrons, it can undergo a variety of reactions involving the formation of multiple bonds, such as double bonds or triple bonds.

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The moles of carbon dioxide produced by the reaction acetylene of 0.055mol of oxygen is  0.044 mole.

Acetylene is a chemical compound with the formula C₂H₂ and structure H−C≡C−H. it is a hydrocarbon and the best alkyne. This colorless fuel is widely used as a gas and a chemical constructing block. it is unstable in its pure form and consequently is usually handled as a solution.

The balanced chemical reaction is,

2C₂H₂ (g) + 5O₂ (g)   ===>   4CO₂ (g) + 2H₂O (g)

2 C2H2 (g)  + 5 O2 (g)   -------->  4 CO2 (g)  + 2 H2O (g)

2 mol acetylene  -------->  4 mol CO2

  ?? C2H2    ------------> 0.055 mol Co2

moles of acetylene = 0.055 x 2 / 4

                           = 0.0275 mol

moles of acetylene = 0.028 mol

5 mole of oxygen produced = 4 mole of CO₂

0.055mol of oxygen = 4/5 ×  0.055

                                   = 0.044 mole

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Answer:

30 positive charged protons

Answer:

Sorry can't help

Explanation:

Cant help!

The pH of a solution is defined as the negative logarithm (base 10) of the hydronium ion concentration: pH = -log[H3O+]. Thus, we can rearrange this equation to find the concentration of hydronium ions:

[H3O+] = 10^(-pH)

Plugging in the given pH value of 4.282, we get:

[H3O+] = 10^(-4.282) = 3.564 x 10^(-5) M

Therefore, the concentration of hydronium ions in the solution is approximately 3.564 x 10^(-5) M, which corresponds to answer choice (d).

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The chemical equation for cellular respiration can be represented as C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy (ATP).

Cellular respiration is the process by which cells generate energy from glucose and oxygen. The balanced chemical equation for cellular respiration represents the overall reaction that occurs.

In this equation, C₆H₁₂O₆ represents glucose, which is the source of carbon and energy. 6O₂ represents oxygen, which is the electron acceptor in the process. The arrow (→) indicates the direction of the reaction.

The products of cellular respiration are 6CO₂ (carbon dioxide), 6H₂O (water), and energy in the form of ATP (adenosine triphosphate). Carbon dioxide and water are waste products that are excreted from the cell. ATP is the energy currency used by cells to carry out various cellular processes.

This equation summarizes the chemical changes that occur during cellular respiration, where glucose and oxygen are converted into carbon dioxide, water, and usable energy in the form of ATP. The process of cellular respiration is essential for providing cells with the energy they need to function and carry out various biological processes.

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Taking into account the reaction stoichiometry, 11.2 grams of BaSO₄ are produced from 10 g of barium chloride.

In first place, the balanced reaction is:

BaCl₂ + H₂SO₄ → BaSO₄ + 2 HCl

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 208.24 grams of BaCl₂ form 233.34 grams of BaSO₄, 10 grams of BaCl₂ form how much mass of BaSO₄?

mass of BaSO₄= (10 grams of BaCl₂× 233.34 grams of BaSO₄) ÷208.24 grams of BaCl₂

mass of BaSO₄= 11.2 grams

Finally, 11.2 grams of BaSO₄ are formed.

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Answer:

Option 3.

LiOH(aq) + HNO₃(aq) —> LiNO₃(aq) + H₂O(l)

Explanation:

To know which option is correct, we must have an ideal of what is acid–base neutralization.

Neutralization is a reaction involving an acid and a base which produces salt and water only.

With the above information, we can easily detect the equation describing acid-base neutralization reaction by considering the products of each reaction to see the one that has water as part of the products.

From the question given above, only the 3rd equation gas water as part of the products i.e

LiOH(aq) + HNO₃(aq) —> LiNO₃(aq) + H₂O(l)

Hence, equation 3 is an acid-base neutralization reaction

Answer:

The formula for Potassium Carbonate is K2CO3

Answer:

Liquids.

Explanation:

Liquids and gases are called fluids because they can be made to flow, or move.

Seven squares represent seven f-subshell orbitals with magnetic quantum number values of -3, -2, -1, 0, +1, +2, +3.

The paramagnetic nature is represented by a single electron in the seventh orbital.

This quantum number describes the spatial orientations of electrons.

It defines the orientation of an orbital in space of a given energy(n) and shape using magnetic quantum numbers (l). It divides the subshell into orbitals made up of electrons.

It is represented by the symbol ml. Each subshell contains 2l+1 orbitals. The value of lies between -l and +l, where l is the azimuthal quantum number.

Orbitals with l=0, s-subshell, and ml = 0 = 1

P-subshell ml = -1, 0, +1 = 3 orbitals for l=1.

When l=2, the d-subshell ml = -2, -1, 0, +1, +2 = 5 orbitals.

For l=3, the f-subshell ml are -3, -2, -1, 0, +1, +2, +3 = 7 orbitals.

These orbitals are represented as squares in orbital notations of an atom, with electrons represented by upward and downward arrows.

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Food scientists work with the chemistry of ingredients in food to improve the quality and stability of the food. They study the use of chemical flavors, thickening agents, stabilizers and preservatives and apply their knowledge to improve existing food products and develop new ones.

GUYS IF YOU GET THE THING ABOUT THE CHILD PERV I WOULD WATCH OUT BUT SOME OF THEM ARE JUST DOING IT TO GET FREE POINTS SO REPORT THEM!! :)

Pls brainliest! :)

Answer:

4

Explanation:

Answer:

B.

Explanation:

I don't know much about this subject, but it seems that a wave is when the line is above the line in the middle.

Answer:

Propane

Explanation:

The balanced chemical reaction of potassium chloride involves 2 moles of potassium to react with 1 mole of chlorine and other are explained below.

Balanced chemical equations are those equations in which all entities are present in same amount on reactant as well as on the product side of the reaction.

Given chemical reactions are:

        2K + Cl₂ → 2KCl

        CF₄ + 2Br₂ → CBr₄ + 2F₂

        GaF₃ + 3Cs → 3CsF + Ga

        MgF₂ + Li₂CO₃ → MgCO₃ + 2LiF

Hence in the formation of potassium chloride balanced equation involves 2 moles of potassium to react with 1 mole of chlorine.

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Answer: Yes, sulfuric acid is highly soluble in water.

Explanation:

a.) The pH of 0.075 M HCl can be calculated using the formula pH = -log[H+]. Since HCl is a strong acid, it completely dissociates in water to form H+ and Cl- ions. Therefore, the concentration of H+ ions in 0.075 M HCl is also 0.075 M. Substituting this value in the formula, we get pH = -log(0.075) = 1.12.

b.) The pH of 3.1 *10^-4 M can be calculated using the same formula, pH = -log[H+]. However, since this is not a strong acid, we need to take into account the degree of dissociation (α) of the acid. For a weak acid, the dissociation constant is given by Ka = [H+][A-]/[HA], where [HA] is the initial concentration of the weak acid and [A-] is the concentration of the conjugate base. We can assume that [A-] is equal to [H+], since the dissociation is very small. Therefore, we can write Ka = [H+]^2/[HA]. Solving for [H+], we get [H+] = sqrt(Ka*[HA]). For the weak acid given in the question, Ka is given as 1.0 *10^-4. Therefore, [H+] = sqrt(1.0 *10^-4 * 3.1 *10^-4) = 1.76 *10^-4 M. Substituting this value in the formula, we get pH = -log(1.76 *10^-4) = 3.75.

c.) The pH of 2.3 *10^-3 M can be calculated using the same formula and the same approach as in part (b). For the weak acid given in the question, Ka is still 1.0 *10^-4. Therefore, [H+] = sqrt(1.0 *10^-4 * 2.3 *10^-3) = 4.79 *10^-4 M. Substituting this value in the formula, we get pH = -log(4.79 *10^-4) = 3.32.

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(e) 5, 4,- 5, 1/2 is the acceptable set of quantum numbers for an electron in an atom.

In chemistry, electrons in atoms are described by four sets of quantum numbers, and they are as follows:

The principal quantum number, or n, typically has integer values ranging from 1 to infinity. From 0 through n - 1, the orbital quantum number can have several values. In contrast to the spin quantum number, the magnetic quantum number can take on values ranging from -l to +l.

Putting this to the back of our thoughts, we can clearly see that only the set of quantum numbers 5, 4,- 5, 1/2 meets the requirements outlined above.

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Answer:Water is attracted to the sodium chloride crystal because water is polar and has both a positive and a negative end. The positively charged sodium ions in the crystal attract the oxygen end of the water molecules because they are partially negative.

Answer:

E)Li

Explanation:

Electronegativity is the tendency of an atom to attract a pair of bonding electrons. In the periodic table, electronegativity increases across the period and decrease down the group.

This means the element at the top of the group would have the highest electronegativity.

The correct option is;

E)Li

The appearance of a colorless solution indicates that all the borate ions have been neutralized and the titration is complete.

The endpoint of a titration is the point at which the reaction is complete, and the reactants have been completely consumed. In the titration of borate ion (BO3^2-) with hydrochloric acid (HCl), the endpoint can be detected using a suitable indicator. One commonly used indicator for this titration is phenolphthalein, which changes color from pink to colorless at a pH of around 8.2.

The addition of HCl to a solution of borate ion results in the formation of boric acid (H3BO3), which is a weak acid. As the HCl is added, the pH of the solution decreases, and at the endpoint, the pH reaches the value at which phenolphthalein changes color.

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Answer:

Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons).

There are approximately 4.201 x 10^23 atoms in 0.6984 moles of silver.

First  we can use Avogadro's number, which is the number of particles atoms, molecules, etc. in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23 particles per mole.

The number of atoms in a given number of moles of a substance is equal to the number of moles multiplied by Avogadro's number. So, to find the number of atoms in 0.6984 moles of silver, we can use the following equation:

Number of atoms = Number of moles x Avogadro's number

Number of atoms = 0.6984 moles x 6.022 x 10^23 atoms/mole

Number of atoms = 4.201 x 10^23 atoms

Therefore, there are approximately 4.201 x 10^23 atoms in 0.6984 moles of silver.

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Answer:

C

Explanation:

APEX

the conclusions of an scientific experiment tell why the data support or reject the hypothesis. Thus option C is correct.

Scientific experiment involve asking different scientific questions, making hypothesis, design experiment, result and conclusion.

A good scientific experiment should have some facts which can be answered by using data analysis.

The types of scientific questions are Verification questions, Theory questions, Experimental questions

The verification question can be solved by collecting data from observation, which include characteristics or properties of a subject.

A theory question refers an imaginative exercise, is not fictional, depend on prior knowledge of the phenomenon being asking about.

The scientific question or an experimental question used to compare the element of a system when altered, it involves variables such as independent, dependent and controlled variables.

Thus option C is correct.

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The number of molecules of nitrogen will be the same as the number of molecules of hydrogen. The correct option is C.

The law states that different gases of the same volume stored at the same temperature and pressure will contain the same number of molecules.

Going by Avogadro's law, 500 ml of nitrogen and 500 ml of hydrogen kept together in one vessel at the same constant temperature and pressure will have the same number of molecules.

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The kinds of the solids are;

SiO2 - Covalent network solid

C6H12O6 - Covalent solid

KI - Ionic solid

A covalent network solid, often referred to as a network covalent solid or just a network solid, is a category of solid material in which the atoms that make up the material are strongly covalently linked to one another, forming an extended three-dimensional network structure.

Covalent network solids are kept together by a dense network of covalent bonds, as opposed to molecular or ionic solids, which are held together by weaker intermolecular forces or ionic interactions, respectively.

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The percentage abundance of Nz- 51 and Nz- 55 are 69.8 % and 30.2% respectively.

We know that an isotope of an element has to do with atoms that have the same atomic number but the atomic masses of the atoms does differ. In this case, we have two isotopes Nz - 51 and Nz -55. We have the relative atomic mass of the elements as  52.21 amu.

Let the percentage abundance of Nz - 51 be x and the percentage abundance of Nz -55 be 1 - x.

52.21 = 51x + 55(1 - x)

52.21 = 51x + 55 - 55x

52.21  - 55 = 51x   - 55x

-2.79 = -4x

x = 0.698

Thus;

Percentage abundance of Nz - 51  = 0.698 or 69.8 %

Percentage abundance of Nz - 55 = 1 - 0.698 or 30.2 %

If I have 63 atoms

Number with isotope Nz - 51  =  0.698 * 63 = 44 atoms

Number with isotope Nz - 55 = 0.302 * 63 = 19 atoms

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