______Is analyzed by qualitative methods

A. The identify of the poison used in a murder.
B. The amount of poison used in a murder.
C. The location of the poison used in a murder.
D. The method used by the suspect to kill the person.

There are 2.71*10^24 atoms of oxygen.

1st) It is necessary to calculate the amount of oxygen in 1.50mol of sodium carbonate (Na2CO3).

We know that 1 mole of sodium carbonate has 3 moles of oxygen, so to calculate the moles of Oxygen in 1.50 moles of Na2CO3 we can use a mathematical Rule of Three:

Now we know that there are 4.5 moles of oxygen in 1.50 moles of sodium carbonate.

2nd) Finally, we can calculate the atoms of oxygen using the Avogadro's number (6.022*10^23 atoms/mol):

So, there are 2.71*10^24 atoms of oxygen in 1.50 mol of sodium carbonate.

Hi there!

To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.

We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.

1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002

Answer: argon

Explanation:

using the last clue “avg atomic mass of 3.33x greater than carbon-12” we can deduce the atomic mass of the element is 12x3.33=40(2sf) hence its argon. we can further confirm from third clue that it is a noble gas hence unreactive

Answer:

H % = 11.11%

O % = 88.89%

Explanation:

atomic weight of H = 1

atomic weight of O = 16

each molecule of water contains 2 atoms of H and one atom of O

hence molecular weight of water = 18

H % = 2 x 100/18 = 11.11%

O % = 16 x 100/18 = 88.89%

Answer:

-H= 11.19%

-O= 88.81%

Explanation: the answer above mine is incorrect!,  i just did it and i got it right, the answer is h= 11.19% and O= 88.81% hope it helps!

The ionization energy, or ionization potential, is the energy required to completely remove an electron from a gaseous atom or ion. The closer and more tightly bound an electron is to the nucleus, the more difficult it will be to remove, and the higher its ionization energy will be.

The coefficients to balance the following reaction: febr3 h2so4 = fe2(so4)3 hbr are FeBr3, H2SO4, Fe2(SO4)3 and HBr.

The balanced chemical reaction is given as: FeBr3 + H2SO4 → Fe2(SO4)3 + 6HBr

The coefficients are given below:

FeBr3 (1) + H2SO4 (1) = Fe2(SO4)3 (1) + 6HBr (1)

The above-given equation is balanced by including the coefficients such that the number of atoms of the elements remains the same on both sides of the reaction.

To balance the given reaction, we need to add the coefficients to the reactants and products.

Therefore, the coefficients of FeBr3, H2SO4, Fe2(SO4)3 and HBr are 1, 1, 1, and 6, respectively.

The balanced chemical reaction is shown below:

FeBr3 (s) + H2SO4 (aq) → Fe2(SO4)3 (aq) + 6HBr (aq)

The balanced reaction states that 1 mole of FeBr3 reacts with 1 mole of H2SO4 to produce 1 mole of Fe2(SO4)3 and 6 moles of HBr.

Hence, the balanced chemical reaction can be achieved by adding the coefficients in the above-given equation. The number of atoms on both sides of the equation should be the same.

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Answer:

atom and tissue

Explanation:

atoms makes up molecules which makes up cell which makes up tissue which comes together to make up organs

Answer:

Fossil energy has been a fundamental driver of the technological, social, economic and development progress which has followed.In 2019, around 84% of global primary energy came from coal, oil and gas. Over the coming decades we need to rapidly reduce this share by displacing them with low-carbon energy sources.Fossil energy has been a fundamental driver of the technological, social, economic and development progress which has followed.In the sections above we looked at the consumption of fossil fuels collectively. But it’s important to look at the role of coal, oil and gas individually – their impacts are not equal. Coal, for example, typically produces more CO2 and local air pollution per unit of energy.There would be more research on the use of alternate fuels.Moreover, fossil fuels are composed primarily of carbon and hydrogen atoms. On combustion they produce carbon dioxide, sulfur dioxide, and carbon monoxide as the main by-products.Solar energy can only be captured during daylight hours.

Explanation:

if you write this then you will get full marks in your assignment it is valied for up to 16 class I don't know about any further it I have mixed many iconic and logic facts that are imp in science!

Answer:

He could add a model of soil layers.

Explanation: C

In an ecosystem where water from mine is polluting river it can be tested by building a model of the soil layers and test if water passes through any of them.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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A solution is defined as a mixture of two or more substances, usually, a solute and a solvent, and the difference between these two are in quantity, solute represents the smallest amount and solvent will represent the highest amount, and while you can have more than one solute, you can only have one solvent for a solution. Therefore the statement is true

Certainly! In a thermite reaction, aluminum metal reacts with iron(III) oxide to produce iron metal and aluminum oxide. The balanced equation for this reaction is:

2 Al + Fe2O3 → 2 Fe + Al2O3

This reaction is highly exothermic, meaning it releases a large amount of heat energy. It is often used in applications where intense heat is required, such as metal welding or cutting.

The thermite reaction occurs due to the large difference in reactivity between aluminum and iron(III) oxide. Aluminum is a highly reactive metal, while iron(III) oxide is a compound made up of iron and oxygen. When aluminum comes into contact with iron(III) oxide, it displaces the iron from the compound, forming iron metal and aluminum oxide.

The reaction is initiated by heating the reactants to a high temperature, typically using a small amount of an igniting agent such as powdered magnesium or a strong flame. Once started, the exothermic nature of the reaction sustains it until all the reactants are consumed.

The reaction proceeds rapidly, accompanied by bright sparks and the emission of intense heat. The high temperatures generated can reach several thousand degrees Celsius, melting the iron formed and producing a pool of molten metal. This property makes the thermite reaction useful for applications like metal joining, where it can be used to weld large pieces of metal together or to cut through solid structures.

In summary, the thermite reaction between aluminum and iron(III) oxide is a highly energetic and violent reaction that produces iron metal and aluminum oxide, releasing a large amount of heat in the process. Its ability to generate extreme temperatures has practical applications in various industries requiring intense heat generation.

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Answer:

true

Explanation:

In 2 hours, it went 60 metres. 60 / 2 = 30 so true

The mass of carbon dioxide released during the reaction is 2.6 grams.

To determine the mass of carbon dioxide released during the reaction between sodium hydrogen carbonate (NaHCO3) and acetic acid (CH3COOH), we need to calculate the difference in mass before and after the reaction.

Before the reaction:

Mass of NaHCO3 = 3.8 g

Mass of acetic acid = 10.5 g

Total mass before the reaction = Mass of NaHCO3 + Mass of acetic acid = 3.8 g + 10.5 g = 14.3 g

After the reaction:

Mass of the contents of the reaction vessel = 11.7 g

To find the mass of carbon dioxide released, we calculate the difference in mass:

Mass of carbon dioxide released = Total mass before the reaction - Mass of the contents of the reaction vessel

= 14.3 g - 11.7 g

= 2.6 g

Therefore, the mass of carbon dioxide released during the reaction is 2.6 grams.

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10.3 g of Al is required to completely react with 30.0 g of MnO₂. The correct answer is option D.

Manganese dioxide reacts with aluminum to produce manganese and aluminum oxide. Here's the balanced chemical equation: 3MnO₂ + 4Al → 3Mn + 2Al₂O₃. Now, let's calculate the mass of Al required to react completely with 30.0 g of MnO₂: From the balanced equation, we can see that 3 moles of MnO₂ react with 4 moles of Al.

The molar mass of MnO₂ is 86.94 g/mol. 30.0 g of MnO₂ is equal to:30.0 g / 86.94 g/mol = 0.3444 mol MnO₂. According to the balanced equation, 0.3444 mol of MnO₂ requires: 4/3 × 0.3444 mol = 0.4592 mol of Al. The molar mass of Al is 26.98 g/mol. 0.4592 mol of Al is equal to: 0.4592 mol × 26.98 g/mol = 12.4 g of Al. Therefore, 12.4 g of Al is required to completely react with 30.0 g of MnO₂. Hence, option D is the correct answer.

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Fire extinguisher is used to stop fires in a laboratory.

Chemical splashes on to your face then we should go to eye wash station for washing face.

Bunsen burner is knocked over while lit and a large fire is started then we should use fire extinguisher and should come out of lab.

Carbon dioxide in fire extinguisher is more denser than oxygen so when we spray carbon dioxide on fire, it cut off the contact with oxygen and fire goes off.

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Gasoline blending in petroleum refineries involves analyzing the properties of different components and determining the optimal mixing ratios to produce gasoline that meets specific octane rating and quality requirements.

Gasoline blending is a critical process in petroleum refineries where different components are combined to produce the desired gasoline product. In this example, the challenge is to blend gasoline from three different components.

To solve the gasoline blending problem, various factors need to be considered such as the desired octane rating, volatility, and environmental regulations. The first step is to determine the optimal proportion of each component based on their individual characteristics. This involves analyzing the properties of each component, such as its research octane number (RON), motor octane number (MON), and vapor pressure.

The second step is to develop a blending strategy that achieves the desired gasoline specifications. This involves determining the appropriate mixing ratios of the three components to meet the target octane rating and other quality requirements. The blending process requires precise calculations and adjustments to ensure the final gasoline product meets the desired specifications.

Additionally, economic considerations play a role in gasoline blending. The cost of each component and the market demand for specific gasoline grades can influence the blending decisions. Refineries aim to optimize the blend to minimize costs while meeting quality standards.

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Answer:

24g÷8g/ml=3

volume =3

A plant needs Carbon dioxide, water, and sunlight, Photosynthesis takes place in the chloroplast.

Photosynthesis is the process by which plants and other organisms convert light energy into chemical energy, which can later be released through cellular respiration to power the activity of the organism.

Without Photosynthesis there would be no green plants, and without green plants, there would be no animals. Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide.

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Answer:

2.8 kg = 2.8 x 10^6 mg

Explanation:

Multiply the value in kilograms by the conversion factor (1000000) otherwise known as 10^6

So, 2.8 kilograms = 2.8 x 1000000 = 2.8 x 10^6 or 2800000 miligrams

Answer:the positive ionic radius is smaller than the neutral atomic radius

Explanation:

Answer:The positive ionic radius is smaller than the neutral atomic radius.

Explanation: just took the test

Answer:

\(\huge\boxed{\sf V_2 = 5.68 \ L}\)

Explanation:

Volume 1 = \(V_1\) = 3.95 L

Temperature 1 = \(T_1\) = -45 °C + 273 =  228 K

Temperature 2 = \(T_2\) = 55 °C + 273 = 328 K

Volume 2 = \(V_2\) = ?

\(\displaystyle \frac{V_1}{T_1} = \frac{V_2}{T_2}\) (Charles law)

Put the given data in the formula.

\(\displaystyle \frac{3.95}{228} = \frac{V_2}{328} \\\\Cross \ Multiply\\\\3.95 \times 328 = V_2 \times 228\\\\1295.6 = V_2 \times 228\\\\Divide \ both \ sides \ by \ 228\\\\1296.5/228 = V_2\\\\5.68 \ L = V_2\\\\V_2 = 5.68 \ L\\\\\rule[225]{225}{2}\)

Mass of 0.75 moles of \(C_{2}H_{6}\) is 22.5 g. 0.75 moles means 3/4 of one mole, the mass of 0.75 mole of ethane will be equal to 3/4 mass of one mole of ethane.

\(C_{2}H_{6}\)  is the chemical formula for ethane. It is made up of two molecules of Carbon and six molecules of Hydrogen.

Mass of 1 mole of ethane, \(C_{2}H_{6}\) is equal to sum of the mass of two molecules of carbon and the mass of six molecules of hydrogen.

mass of 1 mole of \(C_{2}H_{6}\) = 2(12) + 6(1) = 30 g

where mass of carbon is 12 g

and mass of hydrogen is 1 g

mass of 0.75 mole of \(C_{2}H_{6}\) = 0.75 (30)

                                             = 22.5 g

Hence, the mass of 0.75 moles of \(C_{2}H_{6}\) is 22.5 g.

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To find the equilibrium constant (Kp) for the reaction, first identify the balanced equation:

Xe (g) + F2 (g) ⇌ XeF2 (g)

Next, calculate the change in pressure for each gas during the reaction:

ΔXe = Initial_Xe - Equilibrium_Xe = 2.24 atm - 0.34 atm = 1.90 atm
ΔF2 = ΔXe / 1 = 1.90 atm (Since the stoichiometric coefficients for Xe and F2 are equal)
ΔXeF2 = 1.90 atm (The pressure of XeF2 increases by the same amount)

Now, find the equilibrium pressures of each gas:

P_Xe = 0.34 atm (Given)
P_F2 = Initial_F2 - ΔF2 = 4.27 atm - 1.90 atm = 2.37 atm
P_XeF2 = ΔXeF2 = 1.90 atm

Finally, calculate the equilibrium constant (Kp) using the expression:

Kp = P_XeF2 / (P_Xe * P_F2) = 1.90 atm / (0.34 atm * 2.37 atm) = 2.3258

The equilibrium constant (Kp) for the reaction is approximately 2.33.

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X is the chemical symbol of the element

Answer:

there is none

Explanation:

your thinking of the symbol for chemical symbol for the element

The final volume of the gas is approximately 57.242 mL.

To find the final volume of the gas, we can use the equation for work done by a gas at constant pressure:

Work = -PΔV

Where:

Work is the work done by the gas on its surroundings (given as 119.9 J),

P is the pressure of the gas (given as 783 torr), and

ΔV is the change in volume.

Since the pressure is constant, we can rearrange the equation to solve for ΔV:

ΔV = -Work / P

Plugging in the values:

ΔV = -119.9 J / (783 torr)

We need to convert the pressure from torr to atm to maintain consistent units:

ΔV = -119.9 J / (783 torr * (1 atm / 760 torr))

ΔV = -0.158 L

The negative sign indicates that work is done on the gas, causing it to expand. To find the final volume, we add the change in volume to the initial volume:

Final Volume = Initial Volume + ΔV

Final Volume = 57.4 mL + (-0.158 L)

Final Volume = 57.4 mL - 0.158 mL

Final Volume = 57.242 mL

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Answer:

4.95

Explanation:

1.00 M H2A

1.38 m NaOH

Titration = 200.0 mL

Calculate moles of NaOH

= \(\frac{100*1.38}{300}\)  = 0.46

calculate moles of H2A

= \(\frac{200 * 1.0}{300}\) = 0.667

therefore the moles of acid left = moles of H2A - moles of NaOH

                                                    = 0.667 - 0.46 = 0.207

pka = - log( ka )

       = - log ( 2.5 * 10^-5 ) = 4.61

calculate PH after 100 ml of 1.38 M NaOH have been added

PH = pka + log \((\frac{salt}{acid} )\)

     = 4.61 + log \((\frac{0.46}{0.207} )\) = 4.95

Explanation:

N2 has 7 electrons. There are two electrons in first shell and five electrons in second shell.

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