Which of these was not proposed by john dalton in 1805?
A. All matter is made of atoms.
B. Adams are made of protons, neutrons and electrons.
C. During chemical reactions, atoms rearrange themselves.
D. The atoms of a particular element are all identical.

How does the type of paper of a paper airplane affect the distance it travels?

The experiment was performed with different types of paper, all paper have different quality, chemical composition,density & all this properties of paper will affect the distance travelled by the paper airplane. hence the motive of experiment was to check how different paper affect the distance travelled by the paper airplane.

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Answer:

Methane

Propane

Explanation:

The compounds that contain C as an essential atom are called organic compounds.

Answer:

1) As the temperature increased what happened to the N2O4 concentration, it decreased

2) Formation of products, products are the right hand side of the equation.

3) Right to left is exothermic

4) Change in enthalpy N2O4 ⇔2NO2, HR = -14 kcal

As it's an exothermic reaction, the enthalpy of the reactants is higher than the products and the sign of the HR will be negative.

Explanation:

N2O4 ⇔2NO2

(colorless) (reddish-brown)

1) As the temperature increased what happened to the N2O4 concentration, it decreased

2) Formation of products, products are the right hand side of the equation.

3) Right to left is exothermic

4) Change in enthalpy N2O4 ⇔2NO2, HR = -14 kcal

As it's an exothermic reaction, the enthalpy of the reactants is higher than the products and the sign of the HR will be negative.

The pH of the solution represent in the diagram, given that the solution contains 1 mole of H⁺ is 2 L is 0.3 (option B)

We'll begin by obtaining the hydrogen ion, H⁺ concentration in the solution. This is shown below:

Concentration = mole / volume

Hydrogen ion, H⁺ concentration = 1 / 2

Hydrogen ion, H⁺ concentration = 0.5 M

Finally, we shall determine the pH of the solution. Details below:

pH = -Log [H⁺]

pH = -Log 0.5

pH = 0.3

Thus, we can conclude that the pH of the solution is 0.3 (option B)

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The statement that "The volume of a gas sample mostly consists of empty space between the moving gas particles" is one of the assumptions of the Kinetic Molecular Theory regarding gases.

What is Collision?

There are different types of collisions, depending on the nature of the objects involved, the speed and direction of their motion, and the type of contact that occurs. For example, elastic collisions are those in which the total kinetic energy of the colliding objects is conserved, meaning that no energy is lost or gained during the collision. In contrast, inelastic collisions are those in which some of the kinetic energy is transformed into other forms of energy, such as heat or sound.

The Kinetic Molecular Theory is a model that describes the behavior of gases. One of the main assumptions of this theory is that gas particles are in constant random motion and move in a straight line until they collide with other particles or the walls of their container.

Another important assumption of this theory is that the volume of a gas sample mostly consists of empty space between the moving gas particles. This means that gas particles are assumed to be very small compared to the overall volume of the gas sample. Therefore, the particles do not occupy all of the available space in the container, but instead only occupy a small portion of it.

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Answer:

C₄H₁₀ + O₂ --> CO₂ + H₂O

Explanation:

The other reactant is stated below the reaction, which is oxygen.

Oxygen is a diatomic element meaning there are usually 2 bonded oxygens. O is incorrect since oxygen is never found as a single atom.

The products are stated below the question. The products are:

- Carbon dioxide

- Water

The chemical formula for carbon dioxide is CO₂

The chemical formula for water is H₂O

Both of the above formulas are very common and are widely known.

Answer:

flour is the main ingredient sooo you need flour,sugar,salt milk,eggs,vegetable oil,vanilla optional.you can add baking powder or baking soda optional.

Answer:

HClO₃(aq) + NaOH(aq) ⇒ NaClO₃(aq) + H₂O(l)

Explanation:

We have the products of a reaction and we have to predict the reactants. Since the products are salt and water, this must be a neutralization reaction. In a neutralization reaction, an acid reacts with a base. To form NaClO₃, the acid must be HClO₃(aq) and the base NaOH(aq). The balanced chemical equation is:

HClO₃(aq) + NaOH(aq) ⇒ NaClO₃(aq) + H₂O(l)

Answer:

Explanation:

a) Here, we want to get the class of the reaction

An endothermic reaction absorbs energy from the surroundings and as such, the change in enthalpy value is positive

This can be deduced from the position of energy in the chemical equation. Since it is added to the reactant side, it is for an endothermic reaction

b) Here, we want to draw a potential energy diagram for the reaction

We have this as follows:

Answer:

A. it conducts electricity

Explanation:

A. Since Nitric Acid is a strong acid, which means it is a strong oxidizing agent, this makes Nitric Acid a good conductor of electricity.

B. Basic solutions are only going to form OH⁻ ions. A Nitric Acid solution will form H⁺ ions.

C. Alkaline substances (pH greater than 7) are more likely to turn blue, so HNO₃ would turn that blue into a red color.

D. I don't know much about phenolphthalein , all I know is that is is pink in Alkaline solutions (basic) and colorless in acidic solutions.  

I hope this helps, good luck!

Answer:

Explanation:

This apparent disparity of the free energy can be taken into account because:

the free energy produced by the hydrolysis of one ATP is adequate enough under psychological circumstances.

The Na-K ATPase aids the pumping of Na+ ions out of the cell and K+ ions into the cell. These actions occurring against their potential(concentration) gradients, which may be produced by hydrolyzing one ATP molecule.

To determine the Cl for NeMutl:Wt, you need to use the data from part 2 of the case study. The data is given as 1x10-10 for the Wt strain and 1x10-7 for the mutant strain. To calculate the Cl, we use the following equation: Cl = 1/[(1/ID50) - (1/LD50)]. Using this equation, we can calculate the Cl to be 3x10-3.

To determine the Cl for NeMut2:Wt, we can use the same equation. Using the data from the table in part B, the Cl for NeMut2:Wt can be calculated to be 8x10-3.Interpreting these results, we can see that NeMut1:Wt has a Cl that is roughly 3 times lower than that of NeMut2:Wt. This suggests that the mutation of NeMut1 is significantly affecting a virulence factor, while NeMut2 may not be affecting a virulence factor as significantly.

It is important to note that similar LD50 and/or ID50 values of a Wt and mutant strain does not necessarily mean that the mutation does not affect a virulence factor. This is because the LD50 and ID50 values are used to measure how much of the pathogen is needed to produce a certain effect, but other aspects of the pathogen such as the speed or rate of infection or the amount of toxin produced can still be different and affect the virulence of the strain.

Cl for NeMut1:Wt cannot be calculated from the data presented in part 2 of the case study. The given results are:|  Inoculum (LD50) |  Mortality (LD50) |  CFU/ml of blood | Wild-type   | 6.5 × 10−7    |  6.5 × 10−7      | 7.0 × 103 | NeMut1  | 1.0 × 10−10    |  6.5 × 10−7     | 3.0 × 105 | NeMut2  | 2.0 × 10−7    |  2.0 × 10−7     | 2.2 × 103 |Since the Cl cannot be calculated from the data given, the correct option is (d) Cl cannot be calculated from the data given.If the LDs0 and/or IDs0 values of a Wt and mutant strain are similar in this type of experiment, it does not necessarily mean that the mutation does not affect a virulence factor.

This is because mutations can affect different aspects of virulence, and the specific virulence factor being measured may not be impacted by the mutation.In order to determine the CI for NeMut1:Wt and NeMut2:Wt, we need to use the following formula:CI = (output ratio of mutant) / (output ratio of wild-type)Output ratio = (CFU/ml of blood) / (inoculum)Using the data from the table, we get:

Output ratio of NeMut1:Wt = 3.0 × 105 / 1.0 × 10−10 = 3.0 × 1015Output ratio of wild-type = 7.0 × 103 / 6.5 × 10−7 = 1.1 × 1010CI of NeMut1:Wt = (3.0 × 1015) / (1.1 × 1010) = 2.7 × 105Output ratio of NeMut2:Wt = 2.2 × 103 / 2.0 × 10−7 = 1.1 × 1010CI of NeMut2:Wt = (1.1 × 1010) / (1.1 × 1010) = 1Interpretation of results from question 5 above: The CI of NeMut1:Wt is much greater than 1, indicating that NeMut1 is more virulent than the wild-type strain. The CI of NeMut2:Wt is equal to 1, indicating that NeMut2 does not exhibit any significant difference in virulence compared to the wild-type strain.

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In a 0.20 M solution of H2A with \(K_1=1.00*10^4\) and \(K_2=1.00*10^8\), the pH is 1.88, and the concentrations of \(H_2A\),\(HA^-\), and\(A^2-\) are approximately \(0.197 M, 2.54*10^{-3} M\), and \(1.95*10^{-15} M\).

To solve this problem, we need to use expressions for the equilibrium concentrations of the species in a diprotic acid:

\([H_2A] = [H_2A]0/(1 + K_1/[H+] + K_1K_2/[H+]^2) \\\)

\([HA^-] = K_1[H_2A]/(1 + K_1/[H+] + K_1K_2/[H+]^2) \\\)

\([A^2-] = K_1K_2[H_2A]/(1 + K_1/[H+] + K_1K_2/[H+]^2)\)

Given \(K_1\) and \(K_2\) values, we can assume that \(K_2\) is much larger than \(K_1\), and thus we can approximate the concentration of \(H_2A\) to be equal to its initial concentration. Therefore, we can simplify the above expressions to:

\([H_2A]\) ≈\([H_2A]0/(1 + K_1/[H+])\)

[HA^-] ≈ \(K_1[H_2A]/(1 + K_1/[H+])\)

\([A^2-]\)≈\(K_1K_2[H_2A]/[H+]^2\)

Substituting the given values:

\([H_2A]\) ≈\(0.20 M/(1 + 1.00*10^4/[H+])\)

[HA^-] ≈ \(1.00*10^4 * 0.20 M/[H+]/(1 + 1.00*10^4/[H+])\)

\([A^2-]\)≈ \(1.00*10^8 * 0.20 M/[H+]^2\)

To find the pH, we can use the equation:

\(pH = -log[H+]\)

After solving the problem iteratively, we get:

pH ≈ 1.88

\([H_2A]\)≈ 0.197 M

[HA^-] ≈ \(2.54*10^{-3} M\)

\([A^2-]\) ≈ \(1.95*10^{-15} M\)

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--The complete Question is, Consider the diprotic acid H2A with K1=1.00x10^4 and K2=1.00x10^8. If you have a 0.20 M solution of this acid, what are the pH and concentrations of H2A, HA, and A-2 in the solution? --

Answer:

Argon

Explanation:

The element that would most likely be a good substitute for neon is "argon".

These two elements belong to the noble gases in Group 18(8A) of the Periodic Table. They are inert gases - they do not react chemically with other substances.

Argon, as an inert gas is often used whenever an inert atmosphere is needed. Argon is used in incandescent light bulbs. It is used to stop oxygen from corroding the filament. It is also used by welders to protect weld area.

Argon is a good substitute for neon in this context because they possess some physical properties which are similar.

Answer: Tetrachloroethylene is an nonpolar molecule.

Answer:

a ). Is Acetic Acid

Am not sure about b tho

Answer:

H2O2

Explanation:

By numbering the atoms we know about that it’s Hydrogen Peroxide

B. The bonds between a hydrogen atom and another atom in a molecule

Answer: C

Explanation: I got it correct !

The abbreviated electron configuration for Al2+ is [Ne]3s2 3p1

since Al has 13 electrons :  [Ne]3s2 3p1

Al2+ means it has lost 2 electrons to become :  [Ne]3s1

Electronic configurations in chemistry can be describe as the way each electron move independently in an orbital, in an average field created by all other orbitals. which also means  the arrangement of electrons in orbitals around an atomic nucleus.

An electron in simple term is a negatively charged subatomic particle that binds together with protons and neutrons  to form an atom's nucleus. it can also be seen as a tiny particle of matter that is smaller than an atom and has a negative electrical charge in it.

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Therefore, the freezing point of the solution is 3.173°C.

Freezing point is the temperature at which a liquid substance turns into a solid at a given pressure. At the freezing point, the solid and liquid states of the substance are in equilibrium, meaning that the rate of melting equals the rate of freezing. The freezing point of a pure substance is a characteristic physical property that depends on the substance's chemical composition and can be used to identify it. When a solute is dissolved in a solvent, the freezing point of the solvent is lowered, and the degree of lowering depends on the amount and identity of the solute.

Here,

To solve for the freezing point of the solution, we need to use the formula:

ΔTf = Kf x molality

where:

ΔTf = change in freezing point

Kf = molal freezing point depression constant

molality = moles of solute per kilogram of solvent

First, we need to calculate the molality of the solution:

Mass of naphthalene = 1.45 g

Molar mass of naphthalene = 128.17 g/mol

Number of moles of naphthalene = 1.45 g / 128.17 g/mol = 0.0113 mol

Mass of benzene = 21.6 g

Density of benzene = 0.879 g/mL

Volume of benzene = 21.6 g / 0.879 g/mL = 24.6 mL = 0.0246 L

Mass of benzene = volume x density = 0.0246 L x 0.879 g/mL = 0.0216 kg

molality = moles of solute / mass of solvent (in kg)

molality = 0.0113 mol / 0.0216 kg = 0.523 mol/kg

Now, we can substitute the given values into the formula to solve for ΔTf:

ΔTf = Kf x molality

ΔTf = 4.45°C/m x 0.523 mol/kg

ΔTf = 2.327°C

Finally, we can calculate the freezing point of the solution:

Freezing point of solution = freezing point of solvent - ΔTf

Freezing point of solution = 5.5°C - 2.327°C

Freezing point of solution = 3.173°C

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Answer:

12000j

mass=1500kg

velocity=4m/s

Kinetic Energy (K E) = 1/2 mv^2

=1/2*1500(4^2)

=1*750*16

=12000j

The balls of the Newton’s cradle eventually stop because they loose energy as they collide.

The balls of the Newton’s cradle lose energy to the air as they move through it due to friction.

These balls make sound when they collide, and consequently the balls loose energy to heat upon collision.

The balls loose energy as they collide with each other and eventually stop.

Thus, we can conclude that the balls of the Newton’s cradle eventually stop because they loose energy as they collide.

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When designing a scientific question, you should ensure the question is:

A scientific question is an inquiry that scientists examine via methods such as observation, experimentation or data collection leading to an answer.

They often require specific parameters for setting up experiments along with means for measuring outcomes or phenomenon under investigation while also needing testable results to establish validity. As such successful ones must possess traits like precision in defining boundaries within which observations will take place making them measurable so they may produce documented evidence supporting the validity of their findings

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Answer:

Ca is a reducing agent and O is the oxidizing agent.

Explanation:

calcium is the reducing agent as it reduces oxygen while it oxidize itself and oxygen is an oxidising agent because it oxidized others and reduces itself. in this equation oxygen is reducing and Calcium is oxidising. and as it is stated in the definition that oxidizing agent is the agent which oxidises others and reduces itself and it is also stated that reducing agent reduces others and oxidize itself. so based on this statement calcium is reducing agent and O is a oxidizing agent.

Answer:

Me too

Explanation:

Answer:

when my friend weighs himself in stone and I do it in kg.

Answer:

47.01 °C

Explanation:

Q = mcΔt

Mass of water = 2470g

c or specific heat capacity of water = 4.18 J °C g

Q = 5.47 x 10⁵ J, which is expanded 547,000 J

No idea what Δt is, but we do know the water began to boil, and we know that water's boiling point is 100°C, so the final temperature had to be 100°C.

547,000 J = (2470) x (4.18) x (Δt)

Rearrange equation for Δt

(547,000) / (2470 x 4.18) = Δt

Δt = 52.98°C

But we're not done. We're trying to find the INITIAL TEMPERATURE of the water, not the TEMPERATURE CHANGE. We already have the final temperature, which is 100°C, and now we have how much the initial temperature rose by to get to 100°C.

All that we have to do now is 100 - 52.98 = 47.02°C

The initial temperature of the water is 47.02°C

Answer:

The molar mass is 138.8843 g/mol 

0.072moles water produced by the reaction of 0.10mol of oxygen.  In reality, it's one of the International System of Units' seven foundation units (SI).

A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created.

The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear. To fill this gap between extremely small and extremely huge numbers, scientists created the mole.

2C\(_8\) H\(_{18}\)+ 25O\(_2\)→ 16CO\(_2\) + 18H\(_2\)O + Heat Energy

0.10mol =oxygen

the mole ratio between oxygen and water is 25:18

moles of water =( 18/25)×0.10=0.072moles

Therefore, 0.072moles water produced by the reaction of 0.10mol of oxygen.

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Answer:

the Ans is 2

Explanation:

marks as BRAINLY

In calcium hydroxide, there are total 6 atoms are present. 2 calcium atoms, 2 oxygen atoms and 2 hydrogen atoms are present in calcium hydroxide molecule.

An inorganic substance having the chemical formula Ca(OH)2 is calcium hydroxide. It is created when quicklime is combined or slaked with water and is a colorless crystal or white powder. It goes by a variety of names, including pickled lime, hydrated lime, caustic lime, builders' lime, and slaked lime.

A white powder without any smell is calcium hydroxide. It is applied in commercial contexts such sewage treatment, paper manufacturing, building, and food processing. It can be used in dentistry and medicine. In root canal fillings, for instance, calcium hydroxide is frequently used.

Calcium oxide is converted to calcium hydroxide, sometimes known as slaked lime, or Ca(OH)2. A little percentage of it dissolves when combined with water, creating a substance known as lime water.

Thus, In calcium hydroxide, there are total 6 atoms are present.

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