An unknown substance has a mass of 13.7 g. The temperature of the substance increases by 17.9 degrees Celsius when 94.4 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances.
SUBSTANCE SPECIFIC HEAT CAPACITY
lead 0.128
silver 0.235
copper 0.385
iron 0.449
aluminum 0.903
water 4.184

Answer:

A

Explanation:

I just know.

The answer is [Boron]

I had this answer on my Chemistry test!

The Ka for the acid can be calculated using the pH of the solution. The pH of 2.64 indicates that the concentration of H+ ions in the solution is 10^(-pH), which is equal to 10^(-2.64).

To find the concentration of the acid, we can use the equation:

[H+] = [A-] = √(Ka × C)

Where [H+] is the concentration of H+ ions, [A-] is the concentration of the acid, Ka is the acid dissociation constant, and C is the concentration of the solution.

Given that the concentration of the solution is 0.0158 M, we can substitute the values into the equation:

10^(-2.64) = √(Ka × 0.0158)

Squaring both sides of the equation, we have:

10^(-5.28) = Ka × 0.0158

Simplifying the equation:

Ka = 10^(-5.28) / 0.0158

Using a calculator, the Ka value can be determined.

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The velocity of the baseball thrown from third base to first base is 23.64 m/s.

The velocity of the baseball can be calculated using the formula:

velocity = distance / time.

The baseball is thrown 39 meters from third base to first base in 1.65 seconds.

To calculate the velocity, simply divide the distance (39 meters) by the time (1.65 seconds): velocity = 39 m / 1.65 s.

The velocity of the baseball is 23.64 m/s.

To show the "GUESS" work, let's break down the steps:

1. Understand the problem: We need to find the velocity of a baseball thrown a certain distance in a specific amount of time.

2. Identify the relevant information: The distance thrown is 39 meters, and the time taken is 1.65 seconds.

3. Choose the correct formula to solve the problem: In this case, the formula for velocity is velocity = distance / time.

4. Plug in the values into the formula: velocity = 39 m / 1.65 s.

5. Solve the equation: When you divide 39 meters by 1.65 seconds, you get 23.64 m/s.

Thus, the velocity of the baseball thrown from third base to first base is 23.64 m/s.

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Answer:

d. The electron-pair geometry is tetrahedral, the molecular geometry is tetrahedral.

Explanation:

According to Valence Shell Electron Pair Repulsion Theory, the shape of a molecule depends on the number of electrons pairs surrounding the valence shell of the central atom in the molecule.

In CH3Cl, the central atom is carbon. Carbon has four regions of electron density surrounding it and no lone pairs. Lone pairs cause molecules to deviate from the expected geometry.

Since CH3Cl has no lone pairs on the carbon central atom, both the molecular and electron pair geometries are tetrahedral.

In CH₃Cl, the electron-pair geometry is trigonal-planar, and the molecular geometry is bent. Therefore, option C is correct.

According to VSEPR (Valence Shell Electron Pair Repulsion) theory, the electron pairs around the central atom in CH₃Cl will arrange themselves to minimize repulsion, resulting in a specific geometry.

In CH₃Cl, the central atom is carbon (C), and it is surrounded by three hydrogen atoms (H) and one chlorine atom (Cl).

The electron-pair geometry is determined by the arrangement of these electron pairs.

Molecular geometry considers only the atoms around the central atom, not the lone pairs.

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. B) excoriation. An abrasion of the skin by scratching, trauma, or chemicals is termed as Excoriation.  Excoriation refers to a superficial injury to the skin caused by mechanical trauma.

such as scratching, rubbing, or scraping. This can occur due to a variety of reasons, including skin conditions such as eczema or psoriasis, insect bites, or contact with chemicals or other irritants. An abrasion of the skin by scratching, trauma, or chemicals is termed as Excoriation. Therefore, option B is the correct answer. Excoriation refers to a superficial injury to the skin caused by mechanical trauma. Excoriations can range from mild to severe and may be accompanied by pain, itching, or bleeding. Treatment depends on the underlying cause and may include topical medications, dressings, or other interventions to promote healing and prevent infection.

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Answer:

Breaking a match in two pieces is an example of a physical change. Lighting a match and letting is burn is an example of a chemical change. Chemical reactions cause chemical changes. In a chemical reaction two or more substances, called the reactants, form different substances called products.

Explanation:

The statement describes conditions in which a mineral can form is "Crystals of minerals dissolve in the groundwater in caves."

Atoms of the relatively similar element and atoms of other elements [such as silica (Si) and calcium (Ca)] can make up a crystal, and they are arranged in a predictable, repeating pattern.

A mineral would be an element as well as a chemical compound which has been produced as a result of geological activity and is often crystalline in nature.

The statement describes conditions in which a mineral can form as "Crystals of minerals dissolve in the groundwater in caves."

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Answer:

If that happened it would weaken our protective magnetic field, which wouldn't be able to protect us from the harmful radiations sent through space. This could cause alot of issues like; damage cells, cause cancer, and fry electronic circuits and electrical grids.

Explanation:

Earths magnetic field is what protects us from harmful radiation!

Hope this helps! :)

This is what has happened when the magnetic poles flipped in the past. This could weaken Earth's protective magnetic field b up to 90% during a polar flip. Earth's magnetic field is what shields us from harmful space radiation which can damage calls, cause cancer, and fry electronic circuits and electrical grids.

helium and neon ( answer C)

The sum of all an object's atoms and molecules' energies makes up the substance's total energy.

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Answer:

This question is incomplete

Explanation:

This question is "lacking" in some words. A substance that conducts electric current when in it's liquid state is an electrovalent or ionic compound and the type of bond present in this substance is electrovalent or ionic bond. This is the type of bond that involves the transfer of electron(s) between constituent atoms. One major characteristic of these substances is that they conduct electric current when dissolved in water. Examples include NaCl and KBr

The question presents a table with many multiplications using different units (mass and velocity) and requires us to decide whether the operations presented are possible.

To solve this question, we should keep in mind this general rule: for units reffering to the same measurement (for example: mass, volume, distance etc.), we are able to multiply the units as long as they are the same. For example: g x g, L x L, m x m. If units are about the same measurement but still different, we should convert one of them in order to make them the same.

On the other hand, when we are talking about division, if we have the same unit on the operator and denominator position, we will have a result as "1" - then we need to analyze the entire value.

Now, considering the operations presented in the question:

On the first one, we have kg multiplied by kg. Although it isn't usual to see square kg (kg^2), we are able to make this operation:

On the second line, we have square g multiplied by kg. In this case, since the first unit is square, we can assume they are not about the same measurement. Thus, we can't complete this operation.

On the third line, there is a division and we should proceed as a normal operation (although the unit km/s isn't usual):

In summary, the answers should be:

1) Is it possible? YES / Result = 45 kg^2

2) Is it possible? NO

3) Is it possible? YES / Result = 0.8 km/s

The following are the oxidation numbers of C and Cl in CH₂Cl₂: Oxidation number of C: +2 and Oxidation number of Cl: -1.

The oxidation number of an atom in a molecule or an ion is the hypothetical charge that an atom would possess if all the bonds in the molecule/ion were considered ionic bonds instead of covalent bonds.

Carbon in CH₂Cl₂ has four valence electrons, out of which two electrons are involved in bonding with two hydrogen atoms and the remaining two electrons are shared with two chlorine atoms. Since the electronegativity of chlorine (3.16) is greater than that of carbon (2.55), chlorine attracts electrons towards itself.

In the CH₂Cl₂ molecule, both chlorine atoms have the same electronegativity, and hence the electrons are shared equally. As a result, each chlorine atom gets one electron from carbon to form a C-Cl bond. Thus, the oxidation state of carbon is +2 and that of chlorine is -1.

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The purchase process involves steps such as initiating a request, vendor selection, approval, purchase order issuance, product delivery, and payment, ensuring a systematic approach to procurement for accountability and efficiency.

The purchase process consists of several steps:

1. The department admin initiates the process by sending a purchase request to the IT department.
2. The IT Manager reviews the request and decides whether to approve or reject it.
3. If the request is approved, the IT Manager contacts various vendors, such as Apple, Dell, HP, ASUS, and Lenovo, to request quotes.
4. The IT Manager receives the quotes and selects the best price.
5. Once the best price is selected, the IT Manager informs the admin and waits for their approval.
6. If the admin approves, the IT Manager finalizes the vendor selection and prepares the purchase request.
7. The IT Manager then sends the purchase request to the Procurement Supervisor.
8. The Procurement Supervisor receives the request and issues a purchase order to the chosen vendor.
9. The Procurement Supervisor reviews the vendor's invoice and processing time.
10. If the processing time elapses and the tracking number has not been received, the Procurement Supervisor cancels the order.
11. If the vendor provides the tracking number within the processing time, the Procurement Supervisor collects the product once it is delivered.
12. At the same time, the Procurement Supervisor submits the payment to the vendor.
13. Once both steps are completed, the purchase process is considered finished, and the purchase is completed.

This process ensures that there is a clear and systematic approach to purchasing items, from the initial request to the final delivery and payment. Each step is important in maintaining accountability and efficiency in the procurement process.

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Answer:

A

Explanation:

B is for photosynthesis, C and D are just energy conversions, A is all about producing energy and stored as Adenosine Triphosphate(ATP) which is respiration

The strong acid and strong base has high rate constant of dissociation. The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, no, acid would not remain acid  if the positions of electrons and protons were swapped.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. Temperature affect the pH. At room temperature pH scale is between 0 to 14. 7 is the pH of neutral solution. No, acid would not remain acid  if the positions of electrons and protons were swapped.

Therefore, no, acid would not remain acid  if the positions of electrons and protons were swapped.

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No, we would not expect a signal at M-77 to be equal in height to the M-79 peak in the mass spectrum of 2-bromopentane.

The M-79 peak in the mass spectrum represents the molecular ion peak, which corresponds to the intact molecule of 2-bromopentane minus one bromine atom (Br). This occurs when the molecular ion (M) loses a neutral bromine atom, resulting in a peak at M-79.

On the other hand, the M-77 peak would correspond to the loss of a methyl group (CH3) from the intact molecule. However, the relative abundance of the M-77 peak is expected to be significantly lower compared to the M-79 peak.

The reason for this difference in peak heights is related to the relative abundance of different fragmentation pathways. The loss of a bromine atom (M-79) is a more favorable fragmentation pathway compared to the loss of a methyl group (M-77) due to the stability and ease of breaking the bromine-carbon bond.

Therefore, we would expect the M-79 peak to be more abundant and appear at a higher intensity compared to the M-77 peak in the mass spectrum of 2-bromopentane.

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it's most abundant in the mid latitudes.

The words that complete these descriptions are law, hypothesis, and experiment.

In science, a law is a statement that accurately describes the way a natural phenomenon occurs. Due to this, laws are created after testing a hypothesis several times. This matches Jean-Baptiste's proposal because his idea about heat flow has been tested by himself and others multiple times.

Different from a law, a hypothesis only states a possible explanation but this should be tested to become a law. This concept can be applied to Sadi because he only has an idea about heat flow but this has not been tested.

This is a procedure that aims at testing a hypothesis. This concept applies to James because he is carrying out an objective procedure to understand energy and heat.

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Answer: A. Gamma radiation can pass through your body

Explanation:

Let's use the Process of Elimination for this problem.

We will start off with B. Gamma radiation is always dangerous to the body.

Facts: Gamma radiation are not always dangerous to the body. Most of the time, Gamma rays and radiation will go through with little to no effect at all. So, now we know that the answer can not be B. Gamma radiation is always dangerous to the body.

Next, let's check if C. Gamma radiation is produced when a neutron turns into a proton is true.

Facts: Gamma radiation has nothing to do with neutrons turning into protons and protons turning into neutrons. Gamma rays are a type of radiation that is everywhere. Gamma rays do not make neutrons into protons. Now, we will eliminate option C. Gamma radiation is produced when a neutron turns into a proton.

Let's check if D. Gamma radiation cannot go through surfaces rather, it will beures  off them is true or not is true or not.

Facts: Gamma rays can enter your body, they do not just bounce off of your body. Gamma rays are invisible and have no weight. They are like lasers and they can enter your body. Now, we know the answer should not be D. Gamma radiation cannot go through surfaces rather, it will beures  off them is not a true statement.

Finally, let's check if A. Gamma radiation can pass through your body is true or not.

Facts: Gamma rays can pass through your body because it is like a natural laser. They can also cause ionizations that can damage tissue in your body. But most of the time, the damage to your tissue is minor. So, we know A. Gamma radiation can pass through your body is a true statement.

Yes, this statement is generally true. A chlorine atom gains one electron to form an anion with a 1-charge because noble gas configurations are stable.

This is because noble gases have a full valence shell of electrons, which is the most stable electron configuration. By gaining one electron, the chlorine atom achieves the same electron configuration as the noble gas argon, making it more stable. This is why elements tend to gain or lose electrons in order to achieve the same electron configuration as the nearest noble gas.

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Answer:

Supersaturated

Explanation:

Answer:

The correct answer is A  Supersaturated

Explanation:

Edge 2022

The molecule expand to relieve steric strain before undergoing torsion to a non-planar structure in order to have several resonating structures.

It should be noted that a molecule simply mean the group of atoms that are bonded together that represents the smallest fundamental unit if the chemical compound.

It should be noted that structures containing fused benzene rings have extensive conjugation. Due to this, they can undergo resonance.

This is vital in decreasing the overall energy of the molecule and helps increase its stability. When there's a change in torsion angle to relieve the steric strain, the molecule won't be planar, hence, the energy will increase and the stability will reduce.

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The sample of Ar would reach a pressure of 2.5 atm at a temperature of 267 K (-6.15 °C or 20.6 °F).

To answer this question, we can use the Ideal Gas Law which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature in Kelvin. We can rearrange this equation to solve for temperature: T = PV/nR.

First, we need to find the number of moles of gas in the 5 liter sample of Ar. Using the density of Ar, we can calculate the mass of Ar in the sample:

mass = density x volume = 1.54 g/L x 5 L = 7.7 g

Next, we can use the molar mass of Ar (39.95 g/mol) to calculate the number of moles:

moles = mass/molar mass = 7.7 g/39.95 g/mol = 0.193 moles

Now we can plug in the values for pressure (2.5 atm), volume (5 L), number of moles (0.193 moles), and gas constant (0.08206 L atm/mol K) to solve for temperature:

T = PV/nR = (2.5 atm)(5 L)/(0.193 mol)(0.08206 L atm/mol K) = 267 K

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Answer:

Coductivity

Explanation:

Because heat conducts to them!