The database used for the identification of victims of earthquakes ____.


would be the same as that used by the countries' forensic scientists

could be compiled from that database found on the Human Genome Project site

needs the identities and profiles of possible victims

would not need to include more profiles than that used for known criminals

Answer: ≈ 13620g³m

Explanation:

A = m d

1Lb = 454g

1000g = 1kg

m = 120Lb × 454/1Lb ×1kg/1000g ≈ 1362Lb/25g kg

m = 10.0 mg / kg

A = m d

(1362kg) ( 10.0 mg/kg)

≈ 13620g³m

Answer:

Snow forms when the atmospheric temperature is at or below freezing, and there is a minimum amount of moisture in the air. Within a cloud, water droplets condense onto one another, causing the droplets to grow. When these water droplets get too heavy to stay suspended in the cloud, they fall to Earth as rain

Explanation:

Answer:

Protein

Explanation:

Answer:

Water, fat, proteins, lactose, and minerals. Milk also contains trace amounts of other substances such as pigments, enzymes, vitamins, phospholipids, and gases.

Answer:

56.5 m/s

Explanation:

Step 1: Convert the temperature to Kelvin

We will use the following expression.

K = °C + 273.15

K = -15.0°C + 273.15 = 258.2 K

Step 2: Calculate the root-mean-square velocity

The root-mean-square velocity is the square root of the average square velocity. We can calculate it using the following expression.

\(v_{rms} = \sqrt{\frac{3RT}{M} }\)

where,

\(v_{rms} = \sqrt{\frac{3 \times \frac{8.314J}{mol.K} \times 258.2K }{2.02g/mol} } = 56.5m/s\)

The root-mean-square velocity for a hydrogen molecule at the given temperature is 1,793.74 m/s.

The given parameters;

The root-mean-square velocity for a hydrogen molecule is calculated as follows;

\(v_{rms} = \sqrt{\frac{3RT}{m} } \\\\\)

where;

\(v_{rms} = \sqrt{\frac{3 \times 8.314 \times (-15+273)}{2\times 10^{-3}} } \\\\v_{rms} = 1,793.74 \ m/s\)

Thus, the root-mean-square velocity for a hydrogen molecule at the given temperature is 1,793.74 m/s.

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Oxygen-16: 8 protons, 8 neutrons, 8 electrons

Oxygen-18: 8 protons, 10 neutrons, 8 electrons

Using atomic and mass numbers, we can find information about the makeup of atoms.

Protons

Every element has a unique number of protons, and every atom of the same element will have the same number of protons. This means that both oxygen atoms must have the same number of protons. The number of protons in an element is equal to its atomic number. Since oxygen has an atomic number of 8, all oxygen atoms will have 8 protons. This means that oxygen-16 and oxygen-18 have 8 protons.

Neutrons

The number of neutrons an atom of a certain element can have varies. Atoms of the same element that have different numbers of neutrons are known as isotopes. The number of neutrons can be found through the mass number. The mass number is the number that follows the dash in the name of the isotope. This number is equal to the protons plus the neutrons. So, to find the number of neutrons in an oxygen atom, subtract 8 protons from the mass number. This means oxygen-16 has 8 neutrons and oxygen-18 has 10 neutrons.

Electrons

Remember that electrons are negatively charged, protons are positively charged, and neutrons have no charge. The number of electrons in an atom determines the charge of the atom. If the number of electrons equals the number of protons, then the charge of the atom will equal 0. If there are more electrons, then the atom will be negatively charged and vice versa. Since neither of the atoms has any indication of a nonzero charge, the number of electrons must equal the number of protons. So, both oxygen atoms have 8 electrons.

Answer:

letting the car fall down the ramp i got that right.

Explanation:

Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

Endothermic is something that needs heat added into it, while exoteric gives heat off

Explanation:

1. Endo(Melting ice)

2. Endo(heat enters the system)

3. Exothermic(making ice)

4. Endothermic( liquid to gas)

5. Exothermic(campfire)

6. exothermic(gas to a liquid)

7. Exothermic (the flame of a candle)

8. Exothermic (heat leaves the system)

9. I don’t know if photosynthesis is exo or endothermic

At 2861 degree Celsius the iron begins to boil. At 1,538 °C the substance begins to melt.

The melting point is the point at which the liquid and solid forms of a solid can exist in equilibrium. It can also be defined as the point at which a solid changes into a liquid under normal atmospheric pressure.

The equilibrium point at which water vapor, liquid water, and solid ice can exist in equilibrium is the only point at which the pressure and temperature of water vapor are the same. The equilibrium point of water vapor is the point at which the partial vapor pressure is the same as that of liquid water at the exact temperature of 273.1600 K.

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The question is incomplete, here is the complete question:

Steam reforming of methane \((CH_4)\) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. An industrial chemist studying this reaction fills a 125 L tank with 20 mol of methane gas and 10 mol of water vapor at 38 degrees celsius. He then raises the temperature, and when the mixture has come to equilibrium measures the amount of hydrogen gas to be 18 mol . Calculate the concentration equilibrium constant for the steam reforming of methane at the final temperature of the mixture. Round your answer to significant digits.

Answer: The equilibrium constant for the reaction is \(3.99\times 10^{-2}\)

Explanation:

We are given:

Initial moles of methane gas = 20 moles

Initial moles of water vapor = 10 moles

Equilibrium moles of carbon monoxide = 18 moles

Volume of the tank = 125 L

The chemical equation for the reaction of methane and water vapor follows:

                       \(CH_4(g)+H_2O(g)\rightleftharpoons CO(g)+3H_2(g)\)

Initial:                20             10

At eqllm:          20-x         10-x            x            3x

Evaluating the value of 'x':

\(\Rightarrow 3x=18\\x=6\)

So, equilibrium moles of methane gas = (20 - x) = [20 - 6] = 14 mol

Equilibrium moles of water vapor = (10 - x) = [10 - 6] = 4 mol

Equilibrium moles of carbon monoxide gas = x = 6 mol

The expression of equilibrium constant for the above reaction follows:

\(K_{eq}=\frac{[H_2]^3[CO]}{[CH_4][H_2O]}\)

We are given:

\([H_2]=\frac{18}{125}=0.144M\)

\([CO]=\frac{6}{125}=0.048M\)

\([CH_4]=\frac{14}{125}=0.112M\)

\([H_2O]=\frac{4}{125}=0.032M\)

Putting values in above expression, we get:

\(K_{eq}=\frac{(0.144)^3\times 0.048}{0.112\times 0.032}\\\\K_{eq}=3.99\times 10^{-2}\)

Hence, the equilibrium constant for the reaction is \(3.99\times 10^{-2}\)

Answer:

A. 201 kPa

Explanation:

We can solve this problem by using Boyle's law, which states:

Where subscript 1 stands for the initial Pressure and Temperature, while 2 stands for the final conditions. That means that in this case:

We input the data:

And solve for P₂:

(a) The balanced chemical equation of magnesium and dilute sulfuric acid is Mg + H₂SO₄ → MgSO₄ + H₂.

(b) The solution was filtered to remove the solid magnesium sulphate (MgSO₄) produced.

The balanced chemical equation of magnesium and dilute sulfuric acid is given as;

Mg + H₂SO₄ → MgSO₄ + H₂.

During the reaction the fizzing that was observed was due to the production of hydrogen gas.

At the end of the reaction, magnesium sulphate (MgSO₄) will be formed, as well as hydrogen gas.

The magnesium sulphate (MgSO₄) formed is a solid, and filtration can be used to remove the solid  magnesium sulphate (MgSO₄) formed.

Filtration is a separation technique used to separate a mixture of liquid and solid, so it will be the best separation technique to recover the produced  magnesium sulphate (MgSO₄).

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The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

A

Explanation:

it has non polar molecule, because it has the equal sharing of electrons, so equal repulsion from all sides. atoms are equally represented.

Answer:

Trigonal planar, non-polar

Explanation:

The oxidation number of reactant Fe is 0 while the  oxidation number of iron in the product is +3

The term redox reaction implies a reaction in which there is an increase in the oxidation number of a specie and the decrease in the oxidation number of another specie.

Now we have the answers as follows;

1) The oxidation number of reactant Fe is 0

2) The oxidation number of reactant oxygen is 0

3) The oxidation number of iron in the product is +3

4) The oxidation number of oxygen in the product is -2

5). Iron is oxidized in the reaction

6) Oxygen is reduced in the reaction

7) The oxidizing agent in this case is the oxygen atom

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Answer:

Zn+2HCl =ZnCl2+H2

Explanation:

I think this is the balanced equation.

Answer:

The Sun is a star.

Explanation:

Answer:

sound and sunlight are not considered matter but, the rest is matter

Explanation:

It will take 1200 minutes for the concentration of reactant to drop to 0.025 mol/liter.

The rate of reaction is given by the following equation:

\(-r_{A} = \frac{200C_{A} C_{EO}}{2+C_{A}} \frac{mol}{liter . min}\)

where

\(-r_{A}\) = is the rate of reaction (mol/liter/min)

\(C_{A}\) = is the concentration of reactant A (mol/liter)

\(C_{EO}\) =  is the concentration of enzyme E (mol/liter)

Given that \(C_{EO}\) = 0.001 mol/liter and \(C_{AO}\) = 10 mol/liter. Find the time needed for the concentration of reactant to drop to 0.025 mol/liter.

Set up the following equation and solve for t:

\(C_{AO} - C_A = -r_A t\)

Substituting the given values:

10 - 0.025 = -(200)(0.025)(0.001)t

Solving for t:

t = 1200 min

Therefore, it will take 1200 minutes for the concentration of reactant to drop to 0.025 mol/liter.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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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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Electrons are transferred from atoms of sodium to atoms of phosphorous The sodium atom looses electron and the phosphorus atoms gains electrons.

The electron is a subatomic particle with an elementary electric charge of -1. Electrons are the first generation of the lepton particle family and are widely regarded as elementary particles due to the lack of known components or substructure.

This transfer causes the sodium atoms  to acquire positive charge and phosphorous to acquire negative charge .

Thus, the sodium and phosphorus atoms strongly attract with each other.

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Your question is incomplete, most probably, your question was

Complete the paragraph about the formation of sodium phosphide.

Electrons are transferred from atoms of

and the phosphorus atoms

to atoms of

C. This transfer makes the sodium atoms

As a result, the sodium and phosphorus atoms strongly

each other.

Answer:

B

Explanation:

Elements in a group are determined by the number of valence electrons

Elements in a period are determined by the number of electrons shell

The electronic configuration of the element is

2,8,8

the number of valence electron is 8 that means it is in Group 8/O

the number of electron shell is 3 that means it is in period (row) 3

Group 8/O elements are called Noble gases

Answer: below

Explanation: One possible synthetic pathway for preparing 3-bromoethylbenzene from benzene involves the following steps:

Nitration: Benzene is nitrated using nitric acid and sulfuric acid as the nitrating agent to form nitrobenzene.

Reduction: Nitrobenzene is reduced using zinc and hydrochloric acid to form aniline.

Acylation: Aniline is acylated using acetyl chloride to form N-phenylacetamide.

Bromination: N-phenylacetamide is brominated using bromine and hydrobromic acid to form 3-bromoacetanilide.

Deacylation: 3-bromoacetanilide is deacylated using sodium hydroxide to form 3-bromoaniline.

Alkylation: 3-bromoaniline is alkylated using ethylene oxide and potassium carbonate to form 3-bromoethylamine.

N-alkylation: 3-bromoethylamine is N-alkylated using acetic anhydride to form 3-bromo-N-ethylacetamide.

Hydrolysis: 3-bromo-N-ethylacetamide is hydrolyzed using sodium hydroxide to form 3-bromoethylbenzene.

Note that this is just one possible synthetic pathway and there are multiple variations and alternative routes that can be used to prepare 3-bromoethylbenzene from benzene.

Answer:

the liquid becomes equal to the rate of condensation

Explanation:

ive come across this question before! and i think its right! :D

The vapor pressure of a liquid at a provided temperature is measured when the rate of evaporation of a liquid evolves equally to the rate of condensation.

Evaporation is the procedure by which water transforms from a liquid to a gas or vapor.

Evaporation is the primary route that water moves from the liquid circumstances around into the water cycle as atmospheric water vapor.

When a molecule around the surface absorbs adequate energy to overwhelm the vapor pressure, it will exit and join the surrounding air as a gas.

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Answer:

Explanation:

Here, we want to get the molar mass of the given molecule

To get this, we have to add up the atomic mass unit of the individual constituent elements, using the multiples where necessary

Thus, we have it that:

The rate of a reaction refers to how fast or slow a reaction progresses over time. Option B is correct.

It is a measure of the change in concentration of reactants or products per unit of time. The rate of a reaction can be expressed in different units, such as moles per liter per second or grams per second. Factors that can affect the rate of a reaction include the concentrations of the reactants, the temperature, the presence of a catalyst, and the surface area of the reactants.

The rate law equation, which expresses the dependence of the reaction rate on the concentrations of the reactants, can also be used to determine the rate of a reaction under different conditions. The rate of a reaction is important for many applications, such as designing chemical reactions for industrial processes, optimizing reaction conditions in laboratories, and understanding biological processes that involve chemical reactions. Option B is correct.

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Answer:

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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Answer:

Compounds From Decaying Matter.

Explanation:

A long time ago, when these were compounds in the ground. They were under lots of pressure, and then they turned into coal/diamonds.

The concentration of Oxalic Acid is 0.2625 M.

A kinetic experiment is conducted to determine the rate law of a reaction. The concentration of Oxalic Acid can be calculated using the given amount of the reactants and the volume of the test tube. A balanced chemical equation can be used to find the stoichiometric ratio of the reactants in the given reaction.The balanced chemical equation for the reaction is:5 H2C2O4 + 2 KMnO4 + 3 H2SO4 → 10 CO2 + 2 MnSO4 + 8 H2OThe stoichiometric ratio between Oxalic Acid and Potassium Permanganate is 5:2. The Oxalic Acid is the limiting reactant, and Potassium Permanganate is in excess.The amount of Oxalic Acid in the solution can be calculated using the formula:molarity = moles of solute / volume of solution in L.The moles of Oxalic Acid can be calculated using the formula:moles of H2C2O4 = Molarity of H2C2O4 x Volume of H2C2O4 in L= 0.525 M x 0.006 L= 0.00315 moles.

The volume of the solution after the addition of the reactants is:6.00 mL of 0.525 M Oxalic Acid + 4.00 mL of distilled water + 2.00 mL of 0.200 M KMnO4= 12.00 mLThe concentration of Oxalic Acid in the solution can be calculated using the formula:Molarity of H2C2O4 = moles of H2C2O4 / volume of solution in L= 0.00315 moles / 0.012 L= 0.2625 M.

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