based on the nebular Theory, which of these is a step in the formation of a new planetary system?

A) evaporation of water
B) nuclear fission of gases
C) repulsion of gaseous masses
D) change of gases into liquids

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.

Answer:

Chemistry A Unit 4: Chemical bonding Lesson 5: Molecular compounds

1. D. The ionic compound has a high meting point.

2. A. The arrangement of bonded atoms

Explanation:

Ionic compounds have a high melting point is a typical characteristic of an ionic compound.

Ionic compounds can be defined as crystalline solids generated by closely packed ions of opposite charge. An Ionic compound is commonly formed whenever metal reacts with nonmetal.

In ionic compounds, the ions are generally held by ionic bonds. The ions are created by losing or gaining electrons to get their nearest noble gas configuration.

In a reaction, the metals lose electrons to gey filled octet while non-metals will gain electrons to get a complete octet.

Ionic compounds have high melting points and are hard as well as brittle. They dissociate into ions whenever dissolved in water. Solutions of ionic compounds can conduct electricity even in the molten state, but solid materials do not.

Ionic compounds form crystals and have higher enthalpies of fusion as well as vapourization than molecular compounds.

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Answer:

C

Explanation:

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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What is described here is actually the formation of ozone in the atmosphere. Ozone is what makes up the ozone layer, the shield in the Earth’s atmosphere that absorb the sun’s harmful UV radiation.

Now when solar energy hits O2 molecules, this results to a release in Oxygen atoms. When these Oxygen atoms combine with O2 molecules, Ozone or O3 is formed.

The correct answers are:

Oxygen atoms

Ozone

Answer: Option (b) is the correct answer.

Explanation:

A chemical reaction is a reaction that causes change in chemical composition of a substance. This change occurs due to the involvement of outer electrons.

Whereas a nuclear reaction is a reaction in which particles in the nucleus, that is, protons and neutrons participate in order to form a new compound.

For example, [tex]^{6}_{3}Li + ^{2}_{1}H \rightarrow 2^{4}_{2}He[/tex]

Both chemical and nuclear reactions are able to release energy in certain reactions and they both are able to form stable atoms.

Thus, we can conclude that the statement only chemical reactions result in atom stability regarding nuclear and chemical reactions is not true.

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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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.

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.

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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Answer;

a. it can never be proved

Explanation;

-One characteristic of a scientific theory is that it can never be proved.

-A scientific theory is a series of statements about the causal elements for observed phenomena. It is a hypothesis or a group of hypotheses about some phenomena that have been supported through research using the scientific method.

Answer: Option (d) is the correct answer.

Explanation:

A scientific theory is the result or output of a number of experiments, research, tests, observations etc.

A scientific theory is checked and verified at each and every step in order to provide a fact to the world. Hence, a scientific theory is that it summarizes a set of observations.

On the basis of these observations, a conclusion or theory is established.

Answer: if delta h and delta s are both negative

Explanation: you’re welcome

A It has reached standard temperature and pressure.

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.

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 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

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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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.

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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The balanced equation for the reaction is: