Why do we use an object's mass , rather than its weight, to indicate the amount of matter it contains?

Answer:

A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.

Explanation:

If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.

In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.

The mass spectrum of an organic compound shows the relative abundances of m to be 51.10% and m 1 to be 7.185%. assuming the peaks are caused by c12 and c13 isotopes,  the number of carbon atoms in the compound is 13 atom

The number of carbon atoms can be calculate as follows:

Ratio of 13C to 12C natural abundance =  1.07%./  98.93% =  1.08%

No. of Carbon atoms = (M1 Relative abundance/M relative abundance) ÷ Ratio of 13C to 12C natural abundance

No. of Carbon atoms =(7.185./ 51.10 )/  1.08

No. of Carbon atoms = 13 atom

Therefore,  the number of carbon atoms in the compound is 13 atom

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Answer:

B.... i think so, not sure lol

Answer:

B. Driving to get supplies

Explanation:

Don't drive in the middle of a tornado EHLBFDHS

Answer:

∆H = -763kJ

Explanation:

Using Hess's law we can determine the ΔH of a reaction from the sum of similar reactions. Using the reactions:

(1) 2PCl3(l) → 2P(s) + 3Cl2(g) ∆H = -640 kJ

(2) 2P(s) + 5Cl2(g) → 2PCl5(s) ∆H = -886 kJ

The sum of (1)/2 + (2)/2 gives:

(1) / 2 = PCl3(l) → P(s) + 3/2Cl2(g) ∆H = -640 kJ/2 = -320kJ

(2) / 2 = P(s) + 5/2Cl2(g) → PCl5(s) ∆H = -886 kJ/2 = -443kJ

PCl3(l) + Cl2(g) → PCl5(s) ∆H = -320kJ - 443kJ =

Answer:

I am sure it's Transuranium.

Explanation:

Hope it's right

Answer:

nitrogen fixation

Explanation:

I took a test on it so i know its right

The average Kinetic energy of the argon atoms is 6.13×10⁻¹⁹ J.

The average kinetic energy of a particle is directly proportional to the temperature of the particle.

To calculate the average kinetic energy of the argon atoms, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence the average Kinetic energy of the argon atoms is 6.13×10⁻¹⁹ J.

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The United States experienced a decrease in the real GDP, high inflation, and arising unemployment rate.

The United States appeared to be entering a recession.A recession is a decline in economic activity, characterized by declining GDP, high unemployment rates, and increased unemployment benefits. Economic analysts and the media commonly use a two-quarter consecutive decline in real GDP as a definition of a recession.

The United States is considered to have entered a recession in the 1970s, which was characterized by an energy crisis, inflation, and recession. However, by the end of the decade, the economy had improved, and it entered into the 1980s with a strong economic performance.

The 1970s were a period of high inflation, low growth, and an oil crisis, which had a significant impact on the United States economy. Therefore, it can be concluded that The United States was in the middle of an economic boom before the 1970s recession and entered a recession in the 1970s due to a decrease in the real GDP, high inflation, and arising unemployment rate.

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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The correct statement is C. When the concentration of the reactant decreases, the cell potential decreases.

The cell potential, also known as the electromotive force or voltage, is a measure of the tendency of a redox reaction to occur. It is directly related to the concentrations of the reactants and products involved in the reaction. According to the Nernst equation, which describes the relationship between cell potential and reactant concentrations, a decrease in the concentration of a reactant leads to a decrease in the cell potential. In a redox reaction, the reactants undergo oxidation and reduction processes. The reactant that is being oxidized is called the oxidizing agent, while the reactant that is being reduced is called the reducing agent. The concentrations of these species affect the reaction rates and, subsequently, the cell potential. When the concentration of the reactant decreases, the reaction rate of the oxidizing agent or the reducing agent decreases. This imbalance in reaction rates disrupts the equilibrium of the redox reaction, resulting in a decrease in the overall cell potential. This decrease occurs because there is less availability of the reactant to participate in the reaction and contribute to the electron transfer process. It is important to note that the concentration of the reactant on its own does not determine the cell potential. Other factors such as the nature of the reactants, temperature, pressure, and electrode potentials also influence the overall cell potential. However, in isolation, when the concentration of the reactant decreases, the cell potential will generally decrease as well.

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The concentration of acid which is needed to completely neutralize 25.0 mL of 1.5 M NaOH, if it takes exactly 12.5 mL to reach the endpoint of the titration would be 3M.

We know that at the equivalence point in a neutralization, the moles of acid are equal to the moles of base.

\( \qquad\longrightarrow \sf Moles_{(Acid)} = Moles_{(Base)}\\\)

\(\footnotesize{ \longrightarrow \sf Volume_{(Acid)}\times Concentration_{(Acid)} = Volume_{(Base)}\times Concentration_{(Base)}} \\\)

According to the specific parameters-

Now that we have all the required values,so we can plug them into the formula and solve for concentration of acid -

\( \footnotesize{\longrightarrow \sf Volume_{(Acid)}\times Concentration_{(Acid)} = Volume_{(NaOH)}\times Concentration_{(NaOH)} }\\\)

\( \longrightarrow \sf 12.5 \: mL \times Concentration_{(Acid)} = 25 \:mL \times 1.5\: M \\\)

\( \longrightarrow \sf Concentration_{(Acid)} = \dfrac{25 \:mL \times 1.5\: M }{12.5\:mL}\\\)

\( \longrightarrow \sf Concentration_{(Acid)} = \dfrac{37.5\:\cancel{mL} \: M }{12.5\:\cancel{mL}}\\\)

\( \longrightarrow \sf Concentration_{(Acid)} = \dfrac{37.5\:M}{12.5}\\\)

\( \longrightarrow \sf Concentration_{(Acid)} = \dfrac{\cancel{37.5}\:M}{\cancel{12.5}}\\\)

\( \qquad\longrightarrow \sf \underline{Concentration_{(Acid)} = \boxed{\sf{3\:M }}}\\\)

A solution is a combination of two or more substances in which the molecules are evenly distributed throughout. A colloid is a combination of two or more substances in which the molecules are not evenly distributed.

A solution is a kind of homogeneous mixture composed of two or more substances. The term aqueous solution is termed when one of the solvents is water. In such a mixture, solute and solvent are the two components in the solution.

The mixing process of a solution happens at a macroscopic scale via the interchange of particles between the solvent and solute.

A colloid is a substance that is composed of particles that are too small to be seen with a microscope, but are large enough so that they do not pass through a semipermeable membrane. An example of a colloid is milk.        

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Answer:

t4g35tgt

Explanation:

5yh45yh45

Answer:

Keep the world safe and clean

Explanation:

safety = keep people inline and help them from making bad decisions

clean = keep the world from being polluted or trashy

Astronomy deals with the study of celestial objects such as moon, stars, sun, planets, etc.

Safety is the art of being protected from danger

Recycling is the process of waste conversion. That is, useful materials are generated from wastes.

Astronomers, in their exploration of extraterrestrial bodies, need to ensure that proper measures are taken to ensure their safety in these locations. Unhealthy practices such as deforestation and indiscriminate waste disposal may cause environmental hazards such as global warming. This is a threat to the atmosphere.

Therefore, wastes have to be converted to reusable products to discourage indiscriminate disposals. Hence the importance of the terms "safety" and "recycling" in astronomy.

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Answer:

Under terrestrial conditions, hydrogen is a gas. At very high pressure and temperature, it can be a metal.

Answer:

180 ml

Explanation:

Aloud is trying to find evidence that a galaxy has supermassive black hole at its center. He should look for the black matter in the center of the Earth. Thus, the correct option is D.

Black matter or dark matter is composed of the particles which do not absorb, reflect, or emit light rays, so they cannot be detected by observing electromagnetic radiations. Dark matter is the material which cannot be seen directly through the eyes.

Dark matter play an important role in the formation of galaxies. Many researchers use the astronomical surveys to build maps of the location where dark matter in the universe is found based on how the light from the distant galaxies bends as it travels to us.

Thus, the matter which fall into a black hole arranges itself in the shape of a disk which is thick at the outer edge, while it is thin along the inner ring of the disk.

Therefore, the correct option is D.

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6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

Hot and rainy conditions

Explanation:

High temperatures and greater rainfall increase the rate of chemical weathering. Rocks in tropical regions exposed to abundant rainfall and hot temperatures weather much faster than similar rocks residing in cold, dry regions. A cold, dry climate will produce the lowest rate of weathering. A warm, wet climate will produce the highest rate of weathering. The warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering.

Got these from the internet to help explain. Hope it helps!

Answer

1s² 2s² 2p⁶ 3s² p⁶ 4s² 3d¹⁰

Explanation

An atom of zinc has 30 electrons and the electron configuration of its atom will be:

1s² 2s² 2p⁶ 3s² p⁶ 4s² 3d¹⁰

The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of buffer solution is 4.00. pH is a unitless quantity.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

HC\(_3\)H\(_5\)O\(_3\)=  0.0570M

C\(_3\)H\(_5\)O\(_3\)Na = 0.0275M

Ka= 1.9x10⁻⁵

pKa = -logKa = 3.85.

Henderson–Hassel Balch equation:

pH = pKa + log[C\(_3\)H\(_5\)O\(_3\)Na ]/[HC\(_3\)H\(_5\)O\(_3\)]

pH = 3.85 + log( 0.0275/ 0.0570)

pH = 3.85 + 0.15.

pH = 4.00

Therefore, the pH of buffer solution is 4.00.

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Atom : B

Cation : C

Anion : A

Given

Pictures for atom, anion, and cation

Required

Classification

Solution

Represent atom : Picture B

Number of protons = number of electrons = 6 = neutral atom

Represent cation : Picture C

Number of protons > number of electrons = 6>5 : charge +1(positive charge)

Represent anionn : Picture A

Number of protons < number of electrons = 5<6 : charge -19negative charge)

The answer is 1ml. The answer is 1ml because of calibration of this graduated cylinder

Answer:

1 mL

Explanation:

According to your definition, it is the difference between marked spaces divided by the # of spaces between marked values.

Difference between 2 marked values: 5 mL

# Of Spaces between marked values: 5

Calibration: 5 mL / 5 mL = 1 mL

An oxidation-reduction reaction will have 2 half reactions in which the different molecules involved in the reaction are gaining or losing electrons.

For example, if our reaction was x 2+ + y --> x + y 2+, x is being reduced and y is being oxidized. Our half reactions will be:

x 2+ + 2e 1- --> x

y --> y 2+ + 2e 1-

When mixing a strong base and strong acid together, the net ionic equation will be H₃O⁺(aq) + OH⁻(aq) → 2H₂O(l).

It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.

The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.

If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but  if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same

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Air escape from a tire when tire valve is opened because the pressure from the weight of the car is forcing the already pressurized air out .

When air is filled in tires, it get into more compact area than the outer atmosphere, therefore particles in tire are close to each other and exert pressure continuously on tire walls to get out of it. Thus, material of the tire need to be pressure resistant as much possible.

After opening the tire valve, air starts leaving with huge sound as strain outside the tire is weaker than that inside the tire. Molecules strike with the same force on larger area and pressure starts diminishing.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Air leaves a tire when the tire valve is opened because

A. the pressure outside the tire is lower than the pressure inside the tire.

B. the pressure outside the tire is greater than the pressure inside the tire.

C. the temperature is higher outside the tire than inside the tire.

D. there are more gas particles outside the tire than inside the tire.

Answer: 0.0499 moles of sodium hydroxide

Explanation:

We can determine the number of moles by using the Molarity equation:

Molarity = Moles / Volume (volume is always in Liters)

We have 2 out of 3 components of this equation

Molarity = 1.000 M

Volume = 49.93 mL / 1000 = 0.0499 L

So we rearrange the equation like the following:

Moles = Molarity x volume

          = 1.000 Mx 0.0499 L

          = 0.0499 moles of sodium hydroxide

A cofactor is an organic or inorganic molecule or ion necessary for proper functioning of some biological catalysts (option E).

A cofactor in biochemistry is a molecule that binds to and regulates the activity of a protein.

A cofactor is a metal or coenzyme responsible for the functioning of an enzyme and must be present.

Therefore, a cofactor is an organic or inorganic molecule or ion necessary for proper functioning of some biological catalysts.

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