Why is mendeleevâs periodic table considered a viable scientific model?

Final answer:

To find the total moles of atoms in the propane sample, consider its molecular formula, with 3 carbon atoms and 8 hydrogen atoms.

Explanation:

The total moles of atoms in the propane sample can be calculated by considering the molecular formula of propane, C₃H₈.

Propane consists of 3 carbon atoms and 8 hydrogen atoms.

Therefore, in the given sample, there are a total of 3 x 15.7 moles of carbon atoms and 8 x 15.7 moles of hydrogen atoms.

Explanation:

An atom holds three sub-atomic particles and these are protons, neutrons and electrons.

Protons have a positive charge, neutrons have no charge and electrons have a negative charge.

Also, when an atom or element is neutral in nature then it means it contains same number of protons and electrons.

For example, sodium element is a neutral atom as it contains 11 protons and 11 electrons.

Thus, we can conclude that for elements to maintain a neutral charge, protons and electrons are the two particles that must have equal numbers.

The pH of a 0.0075 M concentration of hydrochloric acid HCl equals 2.1, calculated using the formula pH = -log[H3O+].

The pH of a solution can be determined using the formula pH = -log[H3O+]. In the case of a 0.0075 M concentration of hydrochloric acid (HCl), HCl is a strong acid and so it will ionize completely in water to form H+ (or H3O+) and Cl- ions. Since the concentration of H+ ions equals the initial concentration of the acid, we have [H3O+] = 0.0075 M. Applying the formula, we would find the pH = -log(0.0075) which equals roughly 2.1. This means that the pH of 0.0075 M HCl is 2.1.

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Answer:

greater than

Explanation:

just took it and yes i know someone already answered but i figred this would be quicker!!!!!!

For energy level 5, there are five sublevels (s, p, d, f, and g).

In the periodic table, the energy level of an element is represented by the principal quantum number (n). Energy level 5 corresponds to the principal quantum number (n = 5). The sublevels within an energy level are represented by the azimuthal quantum number (l). The possible values of l range from 0 to (n - 1).

Therefore, for energy level 5 (n = 5), the possible values of l would be 0, 1, 2, 3, and 4.

Each value of l corresponds to a different sublevel designation:

l = 0: s-sublevel

l = 1: p-sublevel

l = 2: d-sublevel

l = 3: f-sublevel

l = 4: g-sublevel

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Rifampin is a nonspecific cyp450 inducer that may: inhibit bacterial transcription by blocking RNA polymerase.

This interaction is important to consider when co-administering medications.

Rifampin is a semisynthetic member of the rifamycin class that works by blocking bacterial RNA polymerase activity, thereby inhibiting transcription. This process prevents the bacteria from synthesizing mRNA, which is crucial for protein synthesis and bacterial growth.

As a nonspecific CYP450 inducer, rifampin can increase the metabolism of drugs that are substrates of the cytochrome P450 enzyme system. Consequently, this induction can reduce the effectiveness of other medications metabolized by CYP450, such as certain anticoagulants, contraceptives, and antivirals.

If a patient on rifampin is also taking an oral contraceptive pill, the effectiveness of the contraceptive can be decreased due to the enhanced metabolism caused by rifampin, leading to a higher risk of unintended pregnancy.

Answer: force and friction

Explanation: because its forward momentum is greater when it goes faster, therefore it requires more force/friction to slow it down to a halt.

Answer:

Explanation:

The balanced reaction should be like this: [tex]2O_{2} + CH_{4} = CO_{2} + 2H_{2}O[/tex]

So, as you can see, balance mean that molecules in the reaction has to be equal, the amount of element involved has to be the same, due to the Conservation of the Mass Law.

So, Hydrogen and Oxygen are not balanced in the given expression, that's why we need to add those coefficients.

To find the mole fraction of HCl in the solution, calculate the number of moles of HCl and C2H6O. Then, divide the moles of HCl by the total moles of all components in the solution.

To find the mole fraction of HCl in the solution, we first need to calculate the number of moles of HCl and C2H6O in the solution. The mole fraction of a component is defined as the moles of that component divided by the total moles of all components in the solution.

First, calculate the number of moles of HCl using its mass and molar mass:

Moles of HCl = mass / molar mass = 5.5 g / 36.461 g/mol = 0.151 mol

Next, calculate the number of moles of C2H6O using its mass and molar mass:

Moles of C2H6O = mass / molar mass = 200 g / 46.07 g/mol = 4.342 mol

Finally, calculate the mole fraction of HCl:

Mole fraction of HCl = Moles of HCl / (Moles of HCl + Moles of C2H6O) = 0.151 mol / (0.151 mol + 4.342 mol) = 0.0334

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Final answer:

The equilibrium constant (Kc) of 2×10¹¹ndicates that at equilibrium, the concentration of carbon dioxide will be relatively high, while the concentrations of carbon monoxide and oxygen will be low.

Explanation:

The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is Kc = 2×10¹¹. The equilibrium constant expression for this reaction is given by:

Kc = [CO₂] / ([CO]²[O₂]).

Based on the equilibrium constant value of 2×10¹¹, the reaction mixture at equilibrium is likely to consist of a relatively high concentration of carbon dioxide and low concentrations of carbon monoxide and oxygen.

Answer:

C

Explanation:

The balanced equation for the reaction is:

The chemical formula of that compound is POCl₃ and Its chemical name is phosphoryl chloride.

It is a chemical compound and its formula is POCl₃. It is manufactured industrially on a large scale from phosphorus trichloride and oxygen. It is a colorless liquid and has a pungent smell, Its molar mass is 153.33 grams per mole, its melting and boiling points are 274.4 K and 378.9 K respectively, it is soluble in water, and its molecular shape is tetrahedral. It is a reducing agent.

It is used in the making of semiconductors, plasticizers, hydraulic fluids, organophosphorus, and pesticides, and it is widely used as a chlorinating agent and dehydrating agent in laboratories.

Hence, the chemical formula of phosphoryl chloride is POCl₃.

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Energy is released in the making of a solution during the process of mixing the solute and solvent particles, characterizing it as an exothermic process.

In the process of making a solution, specifically in Chemistry, energy is always released when mixing the solute and solvent particles. This process is also referred to as the exothermic process. In an exothermic process, the system (i.e., the solute and solvent) releases energy to its surroundings.

Think about when you dissolve salt in water. The salt particles, or solute, disperse among the water particles, or solvent, thus forming a solution. In this process, heat is often produced and released to the environment, signifying that energy is released during the dissolving process.

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In the chemical reaction of NH3 with O2 that produces NO and H2O, the stoichiometric ratios are used to determine that 4.5 moles of H2O production results in the formation of 3 moles of NO.

The question is referring to a chemical reaction, specifically a stoichiometric equation. The equation shows the reaction between ammonia (NH3) and oxygen (O2) to produce nitrogen monoxide (NO) and water (H2O).

According to the stoichiometric coefficients, which are the numbers in front of the molecules, for every 6 moles of water (H2O) formed, 4 moles of nitrogen monoxide (NO) are produced. To find how much NO is produced when only 4.5 moles of H2O are formed, we need to set up a proportion: 4 NO/6 H2O = x (moles of NO)/4.5 H2O. Solving for x gives us 3 moles of NO.

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The balanced equation for the reaction between sodium sulfate (Na₂SO₄) and lead(II) nitrate (Pb(NO₃)₂) to form sodium nitrate (NaNO₃) and lead(II) sulfate (PbSO₄) is as follows:

2 Na₂SO₄ + Pb(NO₃)₂ ⇒ 2 NaNO₃ + PbSO₄

In this equation, we balance the number of atoms on both sides of the equation. There are two sodium (Na) atoms on both sides, two sulfate (SO₄) ions on both sides, two nitrate (NO₃) ions on both sides, and one lead (Pb) atom on both sides. The equation is now balanced.

On the left-hand side of the equation, we have 2 sodium sulfate molecules and 1 lead(II) nitrate molecule.

On the right-hand side of the equation, we have 2 sodium nitrate molecules and 1 lead(II) sulfate molecule.

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Final answer:

The complete balanced chemical equation for the reaction of sodium sulfate with lead(II) nitrate to form sodium nitrate and lead(II) sulfate is Na2SO4(aq) + Pb(NO3)2(aq) → 2NaNO3(aq) + PbSO4(s).

Explanation:

The question pertains to writing a complete and balanced chemical equation for a double-replacement reaction between sodium sulfate (Na2SO4) and lead(II) nitrate (Pb(NO3)2), resulting in the formation of sodium nitrate (NaNO3) and lead(II) sulfate (PbSO4), the latter being a precipitate. To balance this reaction, we must ensure that the number of atoms of each element is the same on both sides of the equation. The balanced chemical equation, by inspection, is:

Na2SO4(aq) + Pb(NO3)2(aq) → 2NaNO3(aq) + PbSO4(s)

We now verify the balance by counting atoms:

2 sodium (Na) atoms on both sides

1 sulfate (SO4) group on both sides

1 lead (Pb) atom on both sides

2 nitrate (NO3) groups on both sides

Each element and polyatomic ion is balanced, confirming that the equation is correctly balanced.

The correct option is b. The balanced chemical equation for the combustion of propane is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. The molar ratio of the reactants and products is 1:5:3:4. Therefore, the correct option given is Reactants: C₃H₈ = 1, O₂ = 5; Products: CO₂ = 3, H₂O = 4.

The molar ratio for the combustion of propane (C₃H₈ ), we must first balance the chemical equation. The unbalanced equation is: C₃H₈ + O₂ → CO₂ + H₂O

Balancing carbon (C) atoms: C₃H₈ + O₂ → 3CO₂ + H₂O

Balancing hydrogen (H) atoms: C₃H₈ + O₂ → 3CO₂ + 4H₂O

Balancing oxygen (O) atoms: C₃H₈ + 5O₂ → 3CO2 + 4H₂O

Therefore, the balanced equation is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

From this balanced equation, we see the molar ratio is: C₃H₈ : O₂ : CO₂ : H2O = 1 : 5 : 3 : 4

Thus, the correct choice is B : Reactants: C₃H₈ = 1, O₂= 5; Products: CO₂ = 3, H2O = 4

The Lewis structure of the covalent compound HCN consists of a carbon atom connected to a hydrogen atom with a single bond and a nitrogen atom with a triple bond. Both carbon and nitrogen have a linear electron-pair and molecular geometry.

The Lewis structure for a covalent compound containing one nitrogen atom, one hydrogen atom, and one carbon atom would be HCN. In the Lewis structure of HCN, carbon is the central atom, connected with a single bond to hydrogen and a triple bond to nitrogen. The nitrogen atom will have one lone pair. The Lewis structure help us visualize the distribution of valence electrons among atoms.

Here, the electron-pair geometries would be nitrogen-tetrahedral, carbon-tetrahedral, and hydrogen-linear. On the local structures, the hydrogen is linear, the carbon appears linear, and the nitrogen appears to be linear as well.

The Lewis structure of the covalent compound that contains one nitrogen atom, one hydrogen atom, and one carbon atom can be determined by following the octet rule. Nitrogen has five valence electrons, hydrogen has one, and carbon has four. The Lewis structure would look like:

N

/ \

H C

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Answer: A carbon atom is most likely to form covalent bond(s) with other atoms.

Explanation:

Carbon atom is a group 14 element and its atomic number is 6. So, electronic distribution of carbon is 2, 4.

That is, it contains only 4 valence electrons. So, in order to attain stability it always needs to gain 4 more electrons by sharing its valence electrons with other atom.

Since, compounds formed due to sharing of electrons are known as covalent compounds.

Therefore, we can conclude that a carbon atom will always form covalent bond with other atoms.

A carbon atom is most likely to form covalent kind of bond with atoms. Therefore, the correct option is option B.

Two atoms sharing electron pairs form a type of chemical bond known as a covalent bond. Atoms in a molecule are joined by a powerful bond. In covalent bonds, electrons are often shared between nonmetal atoms in order to create a stable electron configuration. The two atoms are attracted to one another due to their common electron pair, which keeps them together in a molecule. The formation and stabilisation of molecules like water and methane depend heavily on covalent bonds.

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Answer:

We can't solve this problem with that data.

Explanation:

Hi! Let's solve this!

To calculate the mass percentage, use (mass of Fe / total mass of ore) * 100

In this case we have the mass of Faith but the exercise does not have enough information to calculate the percentage.

We can't solve this problem with that data.

To solve this problem, let us say that:

x = volume of 1:2000 drug "i" solution

y = volume of 7% drug "i" solution

Assuming volume additive, then this forms:

x + y = 120 mL

x = 120 – y                    ---> 1

1:2000 also refers to 0.0005 concentrations and 7% also refers to 0.07 concentrations. By doing a component balance:

0.0005 x + 0.07 y = 0.035 (120 mL)

0.0005 x + 0.07 y = 4.2

Substituting equation 1 into this derived equation to get an equation in terms of y:

0.0005 (120 – y) + 0.07 y = 4.2

0.06 – 0.0005 y + 0.07 y = 4.2

0.0695 y = 4.14

y = 59.568 mL = 59.57 mL

From equation 1, x would be:

x = 120 - 59.57

x = 60.43 mL

Answers:

59.57 mL of 1:2000 drug "i" solution

60.43 mL of 7% drug "i" solution