Some physical evidence was obtained from a crime scene. For which of these pieces of evidence will forensic scientists conduct an identification test?
A.
a hair strand
B.
a black powder
C.
a glove
D.
bloodstains

Answer:

A deer

Explanation:

Volcanic Ash and dust would cover the surface of the pond. This would prevent the growth of planktons which serves as food for them. Sunlight would not be able to penetrate the pond to furnish it with a very important ingredient for photosynthesis. As we know that most fishes are heterotrophs.

For grasses and trees, the dust and Ash particles would cover the leaves which is the site of photosynthesis. Plants are autotrophs that manufactures their own food through sunlight and carbondioxie. Most of the plants would die off since they can't remove the Ash and dust covering on them.

A deer is an heterotroph and a motile animal. It can easily leave that region and source for food elsewhere in the ecosystem.

Fish in a pond are most likely to survive a volcanic eruption with heavy ash fall, as they are somewhat protected from the immediate effects, while deer, trees, and grass may struggle significantly due to the impact on their habits and food sources.

Following a volcanic eruption that deposits a large amount of dust and ash in a region, different forms of wildlife will have varying chances of survival depending on their adaptability and the impact of the eruption on their specific habitats and food sources. For deer, their survival might be compromised as the ash can cover the vegetation they rely on for food and they might also suffer from respiratory issues caused by the ash particles. Trees might also struggle to survive if the ash is thick enough to block sunlight and damage their leaves, leading to reduced photosynthesis. Grass could potentially revive from such an event if the ash layer is not too thick and can actually be enriched by the mineral content of the ash over time, if they are not smothered. Fish in a pond would likely have the best chance of survival assuming the ash fall does not drastically change the pH or temperature of the water. They are somewhat insulated from the immediate effects of the ash fall and might survive even when other wildlife struggles.

The compound which is obviously incorrect is dihydrogen oxide

The compound name 'mercury chloride' is incorrect because it does not specify the oxidation state of mercury, which can be either I or II.

The compound name that is obviously incorrect among the given options is mercury chloride. The reason this name is incorrect is because it uses the common or trivial name for the element mercury instead of its systematic IUPAC name. In IUPAC nomenclature, mercury can form two common compounds: mercury(I) chloride also known as mercurous chloride (Hg2Cl2) and mercury(II) chloride also known as mercuric chloride (HgCl2). The correct IUPAC nomenclature must specify the oxidation state of mercury since it can have multiple oxidation states. The other names given, such as potassium dichromate (K2Cr2O7), carbon dioxide (CO2), and dihydrogen oxide (H2O), are correct according to IUPAC rules.

Answer:

140kpa

Explanation:

Answer:

140 kilopascals should be the pressure of the gas in the cylinder.

Explanation:

Boyles alw:

[tex]P_1V_1=P_2V_2[/tex]

[tex]P_1=70 kilopascals[/tex]

[tex]V_1=8.0 L[/tex]

[tex]P_2=?[/tex]

[tex]V_2=4.0 L[/tex]

[tex]P_2=\frac{P_1\times V_1}{V_2}=\frac{70 kilopascals\times 8.0 L}{4.0 L}=140 kilopascals[/tex]

140 kilopascals should be the pressure of the gas in the cylinder.

Answer:

C. Eubacteria

Explanation:

Answer: Eubacteria

Explanation: Animalia, Plantae and Fungi all reproduce through sexual reproduction where as eubacteria can reproduce asexually.

Answer:

0.0125 mol.

Explanation:

Molarity of a solution is the no. of moles of a solute per 1.0 L of the solution.

M of HCl = 0.5 mol/L.

V = 25.0 mL = 0.025 L.

∴ no. of moles of HCl present in the flask at this time = MV = (0.5 mol/L)(0.025 L) = 0.0125 mol.

Charles's law, depicted graphically, shows a direct proportional relationship between gas volume and its temperature, given a steady pressure. This is represented by a graph with a positive linear correlation.

A graph representing Charles's law shows the relationship between the volume and the temperature of a gas at constant pressure. Specifically, it will illustrate a straight line with a positive slope, reflecting that as temperature increases, volume increases proportionally, and vice versa. This is an essential concept in thermodynamics.

For example, when a balloon is heated, its internal volume increases even when the amount of air within remains constant. This response is a direct demonstration of Charles's law. So, are line graphs that perfectly represent the direct relationship between gas temperature and volume.

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Answer:

The use of plasma is in technology is very broad, including the medical sector, automotive and areas of scientific development

Explanation:

Plasma technology can be used in various ways, where it is a matter of joining materials or modifying the surface properties in a defined way. This technology can modify the surfaces treated, the cleaning of contaminated components, the activation of plastic parts, the etching of fluoroplastics and silicon and the application of coatings to these plastic parts are some applications.

Answer:

C

Explanation:

making fluorescent lights for houses

Answer: Four Bonds

Explanation:

A carbon atom can form at max four bonds, for example with Hydrogen. Since carbon has 4 electrons, it needs four more electrons to achieve the noble gas state. Carbon needs four more hydrogens, which has one electron, to bond four bonds

Eutrophication is caused by an excess amount of nutrients within the water. These nutrients can be collected within a lake by runoff from a agricultural area filled with fertilizers, etc etc. The algae within the body of water would grow at a rapid rate, causing a depletion for oxygen within the water and the lack of sunlight underneath the water surface.

Answer:

The vinegar is highly acidic by 100 times than yogurt.

Explanation:

∵ pH = -log[H⁺]

∵ pH = -log[H⁺]

∴ 5 =  -log[H⁺]

∴  [H⁺] = 1.0 x 10⁻⁵ M.

∵ pH = -log[H⁺]

∴ 3 =  -log[H⁺]

∴  [H⁺] = 1.0 x 10⁻³ M.

the ratio of H⁺ in vinegar to that in yogurt = 1.0 x 10⁻³ M / 1.0 x 10⁻⁵ M = 100.0.

∴ The vinegar is highly acidic by 100 times than yogurt.

Answer:

Electronegativity is the measure of a tendency of an atom to attract the bonding pairs of electrons.

Electronegativity is a measure of how badly an atom wants electrons. The higher an atom's electronegativity, the more greedy it is for electrons, the more it wants to try to steal them from other atom's. This involves a concept called ionic bonding because there are electron givers and electron takers. This has to do with whether an element is a metal or a nonmetal.

Metals are very generous and are willing to let go of or give there electrons away. On the other hand, nonmetals don't give up their electrons.

Final answer:

Using the Combined Gas Law, the pressure of the air in the lungs is calculated to be 1.228 atm when it expands to 215.0 mL at the body temperature of 37.2°C.

Explanation:

The question involves applying the Combined Gas Law to determine the pressure of the air in the lungs of a scuba diver when it expands from the scuba tank conditions to the lungs' conditions. The initial pressure (P1) is 3.50 atm, and the initial volume (V1) is 75.0 mL at an initial temperature (T1) of 5.0°C (278.15 K). The final volume (V2) is 215.0 mL, and the final temperature (T2) is 37.2°C (310.35 K).

To find the final pressure (P2), we can rearrange the Combined Gas Law:

P1 × V1 / T1 = P2 × V2 / T2

Solving for P2:

P2 = (P1 × V1 × T2) / (V2 × T1)

P2 = (3.50 atm × 75.0 mL × 310.35 K) / (215.0 mL × 278.15 K)

P2 = 1.228 atm

The pressure of the air in the lungs, when it expands to 215.0 mL at the body temperature of 37.2°C, is 1.228 atm.

For Number 2 It Is The Law Of Conversation Of Mass

Number 3 Atoms Of Each Element

Number 7 Oxygen

Number 5 Single Replacement Reaction

I answered a few of them

Answer:

[tex]\boxed{\text{2.2 g/L}}[/tex]

Explanation:

We can use the Ideal Gas Law to calculate the density of the gas.

   pV = nRT

      n = m/M           Substitute for n

   pV = (m/M)RT     Multiply both sides by M

pVM = mRT            Divide both sides by V

  pM = (m/V) RT

     ρ = m/V             Substitute for m/V

 pM = ρRT              Divide each side by RT

[tex]\rho = \frac{pM }{RT}[/tex]

Data:

p = 1.00 bar

M = 49 g/mol

R = 0.083 14 bar·L·K⁻¹mol⁻¹

T = 0 °C = 273.15 K

Calculation:

ρ = (1.00 × 49)/(0.083 14 × 273.15) = 2.2 g/L

The density of the gas is [tex]\boxed{\text{2.2 g/L}}[/tex].

aFinal answer:

The density of a gas with a molar mass of 49 g/mol at STP is calculated as 2.1875 g/L by dividing the molar mass by the molar volume of a gas at STP which is 22.4 L/mol.

Explanation:

The question asks about the density of a gas with a known molar mass at standard temperature and pressure (STP). At STP, we can utilize the ideal gas behavior which states that one mole of any gas occupies 22.4 liters. To find the density at STP, you use the molar mass of the gas and the volume that one mole occupies.

To calculate the density of the gas, you would use the formula:
Density (d) = Molar mass (M) / Molar volume at STP (V)

Since we know that the molar mass (M) of the gas is 49 g/mol, and the molar volume (V) at STP is 22.4 L/mol, we can plug these into the density equation:
d = M / V = 49 g/mol / 22.4 L/mol

Thus, d = 2.1875 g/L.
Hence, the density of the gas at STP is 2.1875 g/L.

Answer:

= 2.64 × 10^7 m

Explanation:

Energy is given by the formula;

E = hc/λ

Where h is Planck’s constant (= 6.626 x 10^-34 Js), c is the speed of light (3.00 x 108 m/s) and λ is the wavelength in meters.

Therefore, wavelength will be given by;

λ = hc/E

  = (6.626× 10^-34 × 3 × 10^8)/(7.53 × 10^-32)

  = 2.64 × 10^7 m

Answer:Reflection, Transmission, and Absorption Reflection is the process by which electromagnetic radiation is returned either at the boundary between two media (surface reflection) or at the interior of a medium (volume reflection), whereas transmission is the passage of electromagnetic radiation through a medium

Explanation:

i cant draw whatever it was but i can answer

Answer:

Look at the image i put

Explanation:

Your welcome please give me brainliest

The decomposition of limestone CaCO3 > CaO + CO2

In iron metallurgy with a blast furnace, the non-redox reaction is the decomposition of limestone (calcium carbonate), which forms calcium oxide and releases carbon dioxide.

In the processing of iron in a blast furnace with various stages, most of the reactions are indeed redox ones, where reduction of iron ores happen. However, one of the equations that is not a redox reaction is the thermal decomposition of limestone, an impure form of calcium carbonate (CaCO3). This is done to remove unwanted impurities, forming calcium oxide (CaO) and releasing carbon dioxide (CO2). The equation for this reaction is CaCO3(s) → CaO(s) + CO2(g). Here, there's no transfer of electrons indicating that it's not a redox reaction.

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Answer:

3 meters/second

Explanation:

Speed is roughly defined as distance travelled over a unit of time. So we can calculate the speed of the ball using the formula:

[tex]s=\dfrac{d}{t}[/tex]

where:

s = speed

d = distance

t = time

Given:

d=12 meters

t = 4 seconds

So we plug that in our equation:

[tex]s=\dfrac{d}{t}[/tex]

[tex]s=\dfrac{12meters}{4seconds}[/tex]

[tex]s=3\dfrac{meters}{second}[/tex]

Final answer:

The average speed of the ball is 3 meters per second, calculated by dividing the distance of 12 meters by the time of 4 seconds.

Explanation:

The question asks for the average speed of a ball that rolls 12 meters in 4 seconds. To calculate the average speed, you divide the total distance traveled by the total time taken. In this case, that would be 12 meters divided by 4 seconds, yielding an average speed of 3 meters per second.

Answer:

Helium.

Explanation:

Hydrogen in the bomb is used in the process of detonation. A stream of tritium, an isotope of hydrogen is released and this fissionable material is very unstable thus it turns during the detonation to helium 3. This triggers a series of reactions that produce large amounts of heat to the surrounding environment causing destruction.

A) Identical

Hope this helps :)

The molecules are identical. It is replicating the DNA, making exact copies of it. Could you imagine if the DNA in our bodies weren't the same? We'd look pretty weird.

Answer:

Hmmmm...

Well, the only option that actually makes sense to me is

C. Kilometers (km)

Please tell me if i'm wrong, but i feel really good about this one. Also, if i can help at all, just ask lol

Centimeters are the appropriate unit to use on the vertical axis for measuring objects like pieces of paper or textbooks as they provide a balance between practicality and precision.

When selecting the appropriate unit of measurement for the vertical axis, one must consider the size of the object being measured. In this case, if we were measuring an item such as a piece of paper or a textbook, we would need a unit that allows us to measure a relatively modest size. The metric units of length range from very small units like millimeters, which are suitable for tiny objects, to kilometers, meant for measuring much larger distances. For example, millimeters would be a good choice for measuring a paper clip with precision. However, since a piece of paper or a textbook can be held easily and are larger, centimeters are the most commonly used and appropriate metric unit. It is versatile for day-to-day objects of similar sizes.

For measuring a textbook, centimeters offer a balance between precision and practicality without being too small like millimeters or too large like meters or kilometers. Therefore, centimeters would be the appropriate choice for the vertical axis when measuring common school supplies like a piece of paper or a textbook. Figure 1.24 provides examples of different metric rulers, where the one showing centimeters would be the best fit for our case.

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An incendiary fire and an accidental fire are two distinct types of fires. Understanding the difference between these two is essential for investigating and managing fire incidents.

An incendiary fire is deliberately set with the intent to cause damage or harm. It is typically an act of arson, where an individual intentionally ignites a fire for various reasons, such as revenge, or vandalism.  

The person responsible may use accelerants like gasoline to ensure a more intense fire. Incendiary fires often display patterns that indicate intentional ignition points, such as the presence of ignition devices.

On the other hand, an accidental fire occurs due to electrical faults, cooking mishaps, or faulty equipment. These fires are typically the result of human error, equipment failure, or natural phenomena like lightning strikes.

In conclusion, while an incendiary fire is intentionally set to cause harm or destruction, an accidental fire occurs due to unintentional causes. Understanding these differences is crucial in fire investigations to identify the responsible party and prevent future incidents.

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Incendiarism, commonly known as arson, is a purposely-set fire. Such fires are then, by definition not accidental in nature. The accident investigator must be aware of the telltale signs of arson, however, so that he may call in the proper criminal investigators to take over the investigation.

An incendiary fire and an accidental fire are two different types of fires.

An incendiary fire is intentionally set by someone to cause damage or harm. This is often an act of arson, where the person ignites the fire with the purpose of causing destruction, revenge, or vandalism. In incendiary fires, accelerants like gasoline may be used to make the fire more intense. Investigators can often identify intentional ignition points and find clues such as the presence of ignition devices.

On the other hand, an accidental fire occurs due to unintended causes. This can happen because of electrical faults, cooking mishaps, or faulty equipment. Accidental fires are usually the result of human error, equipment failure, or natural events like lightning strikes.

Understanding the difference between these two types of fires is important for investigating fire incidents. It helps investigators identify the responsible party and take measures to prevent future incidents.

An incendiary fire and an accidental fire are two different types of fires based on their origin and intent.

An incendiary fire is intentionally set by someone with the purpose of causing damage, harm, or destruction. It is often an act of arson, where a person deliberately ignites a fire. The individual may have various motivations, such as seeking revenge, committing vandalism, or attempting insurance fraud. In incendiary fires, the person responsible may use accelerants like gasoline to ensure a more intense and widespread fire. These fires often exhibit specific patterns that indicate intentional ignition points, such as the presence of ignition devices or multiple points of origin.

On the other hand, an accidental fire occurs unintentionally and without any malicious intent. It is typically the result of human error, equipment failure, or natural causes. For example, an accidental fire could happen due to electrical faults, such as faulty wiring or overloaded circuits. It could also occur as a result of cooking mishaps, such as leaving a stove unattended or a grease fire getting out of control. Additionally, natural phenomena like lightning strikes can cause accidental fires.

Understanding the difference between these two types of fires is crucial for investigating and managing fire incidents. Investigators need to determine whether a fire was intentionally set or if it was accidental. This information helps identify the responsible party, gather evidence, and take appropriate legal action if necessary. It also aids in implementing preventive measures to reduce the risk of future fire incidents.

I hope this provides a clearer explanation of the difference between an incendiary fire and an accidental fire. Let me know if you have any further questions!

Answer:

B. 10:13

Explanation:

It is clear from the following balanced equation:

13 mole of oxygen (O₂) react with butane (C₄H₁₀) to give carbon dioxide (CO₂) and 10 moles of water (H₂O).

∴ The molar ratio between water and oxygen = (no. of moles of water : no. of moles of water) = (10:13)

So, the right choice is:

B. 10:13

Answer:

10:13

Explanation:

Answer via Educere/ Founder's Education

A shows okay please mark it brainliest

Answer:

The correct answer is option B.

Explanation:

Water is formed formed by combination of oxygen  and hydrogen atoms.

The chemical equation for the formation of the water is given as:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

According to reaction, 2 moles of hydrogen gas reacts with 1 mole of oxygen produce 2 moles of water molecules.

Hydrogen + Oxygen → Water

Answer:

Yes you are right

the reactions catalyzed by hexokinase, phosphofructokinase, and pyruvate kinase

Explanation:

The answer is:

4 moles of [tex]KClO_{3}[/tex] are required to produce 6 moles of  [tex]O_{2}[/tex]

To solve stoichiometric problems, we need to write the balanced equation of the compound that we are working with.

Potassium chlorate decomposition is given by the following equation:

[tex]2KClO_{3}->3KCl+3O_{2}[/tex]

Now, from the equation we know that 3 moles of [tex]O_{2}[/tex] gives 2 moles of [tex]2KClO_{3}[/tex], we can calculate how many moles of the same compound react to produce 6 moles of [tex]O_{2}[/tex] the following equation:

[tex]\frac{No.molKClO_{3}}{6molO_{2}}=\frac{2molKClO_{3}}{3molO_{2}}\\\\No.molKClO_{3}=6molO_{2}*\frac{2molKClO_{3}}{3molO_{2}}\\\\No.molKClO_{3}=4molKClO_{3}[/tex]

Hence, we have that 4 moles of [tex]KClO_{3}[/tex] are required to produce 6 moles of  [tex]O_{2}[/tex]

Have a nice day!

Answer: Argon (Ar)

Explanation:

The reason why it is Argon is because when you add the electrons 2+2+6+2+6, there will be 18 electrons total and the number 18 is also from the atomic number. I just learned this a while ago and remembered how to do it since you need help with this. I hope this helps and have a good day!

The atomic number 18 element argon (Ar), which has the electron configuration 1s2 2s2 2p6 3s2 3p6, is represented by the electron configuration you gave.

The distribution of electrons in an atom's energy levels, sublevels, and orbitals is shown by the electron configuration notation. The electron configuration in this situation shows that argon has 18 total electrons. This electron configuration, which is typical of the noble gas configuration found in argon, represents a filled third energy level (n = 3), as well as a filled second energy level (n = 2).

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C-N> C=N > CN The distance between the centers of two atoms that are covalently bonded is known as bond length. The length of the not entirely settled by the number of reinforced electrons. The higher the covalent bond the more grounded the draw between the two particles and the more limited the bond length.

One of the most common bonds in organic chemistry is a carbon–nitrogen bond, which is a covalent bond between carbon and nitrogen. Amines, nitrogen is trivalent and has five valence electrons; the remaining two electrons form a lone pair.

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The bonds in decreasing order of length are: C-N (longest), C=N, and C≡N (shortest). This is because there's an inverse relationship between bond length and bond energy.

In Chemistry, there's an inverse relationship between bond length and bond energy. The bond with higher bond energy tends to be shorter because it is stronger and pulls the atoms closer together. Based on this, the bonds in decreasing order of length (longest to shortest) should be: C-N, C=N and C≡N.

The C-N bond has the lowest bond energy (305 kJ/mol) hence it is the longest. The C=N bond has a higher bond energy (615 kJ/mol) than a single bond hence is shorter. The C≡N bond has the highest bond energy (887 kJ/mol) suggesting it's the shortest of the three.

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Answer-The correct option is option d with says all of the above.

Explanation- All three acids that are given combined together to form acid rain in which nitric and sulphuric acid are stronger acids present while carbonic acid is a weaker one.

The carbon dioxide admitted in air combines with water to form carbonic acid and gives a weak acidic nature to rainwater. Pollution in nature makes sulphur and nitrogen present in air react to form the stronger acids responsible for acid rain.

N2O4Pb. Chemical Names: 13826-65-8. Lead nitrite. Nitrous acid, lead(2+) salt.