4. A 55 kg sled is sliding down a hill. At the 7 m mark, it has a velocity of 1.8 m/s. What is
the mechanical energy of the system?

The pH of a 0.81 M solution of methylammonium iodide is 0.092.

pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

The pH of a substance or solution can be calculated by using the following expression;

pH = - log {H}

Where;

According to this question, 0.81M is contained in a solution of methylammonium iodide.

pH = - log {0.81}

pH = 0.092

Therefore, 0.092 is the pH of the methylammonium iodide.

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The state of matter with no definite volume and no definite shape is gas.

Matter is anything that has mass and occupies space.

There are three main physical states in which matter can exist. Each of these physical states has unique properties that are used to identify them.

The three physical states of matter are:

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Consider the following equilibrium system:

2HI ⇌ H₂ + I₂ At constant temperature and volume, if the more I₂ is added to the above equilibrium. The equilibrium results from shift to : left with a net decrease in [H₂].

The balanced reaction is given as :

2HI ⇌ H₂ + I₂

if we add more  I₂ in the given equilibrium , then equilibrium will to left side and with the net decreases of  [H₂]. the production HI increase.

Thus, Consider the following equilibrium system:

2HI ⇌ H₂ + I₂ At constant temperature and volume, if the more I₂ is added to the above equilibrium. The equilibrium results from shift to : left with a net decrease in [H₂].

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new volume of gas is 88.7L.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

{ (0.92atm) (100 ml)} ÷283K ={ (1 atm) (V₂)} ÷273 K

V₂ = 88.7L

Therefore the new volume of gas is 88.7L.

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Answer:

A). Water

PLEASE GIVE BRAINLIEST THANK YOU!!!

Answer:

water

Explanation:

Ca2+ as calcium can leave 2 electrons to have an octet config.

The amount of coconut milk added if the final temperature of the soup was found to be 72.0 °C is 430g

The amount of coconut milk added can be found using the equation:

m₁C₁ΔT₁ = m₂C₂ΔT₂

Where m is the mass, C is the specific heat, and ΔT is the change in temperature.

In this equation, m₁ is the mass of the coconut milk, C₁ is the specific heat of the coconut milk, ΔT₁ is the change in temperature of the coconut milk, m₂ is the mass of the soup, C₂ is the specific heat of the soup, and ΔT₂ is the change in temperature of the soup.

We are given the specific heat of the coconut milk and the soup, the change in temperature of the soup, and the final temperature of the soup. This allows us to solve for the mass of the coconut milk, which is m₁.

m₁ = m₂C₂ΔT₁/C₁ΔT₂

m₁ = (1175 g)(3.60 J/g°C)(72.0°C - 90.0°C)/(3.98 J/g°C)(72.0°C - 25.0°C)

m₁ = -427 g

This answer is impossible because the mass of a substance cannot be negative. By solving it in other means we get,

The amount of coconut milk added can be found using the equation

ΔQ = mCΔT

ΔQ is the heat transfer, m is the mass, C is the specific heat, and ΔT is the change in temperature.

We are given the specific heat of coconut milk (Cs = 3.98 J/g°C), the initial temperature of the coconut milk (25.0°C), the final temperature of the soup (72.0°C), and the heat transfer of the soup (ΔQ = 1176 * 3.6*47 = 81168 Joules).

Therefore, the equation becomes:

81168 = m(3.98)(47)

m = 81168 / (3.98 * 47)

m = 81168 / 189.06

m = 429.6 grams

The amount of coconut milk added was 429.6g which could be rounded off as 430g

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The net ionic equation is :

Ba²⁺  +  2OH⁻ +  2H⁺  +  SO₄²⁻   ---->   BaSO₄  +  2H₂O

The balanced molecular equation is given as:

Ba(OH)₂   +  H₂SO₄   ----> BaSO₄  +  2H₂O

The net ionic equation is the equation in which we breaking up into ions and cut off the spectator ions that is the ion which is common in both side , we get :

complete ionic equation first :

Ba²⁺  +  2OH⁻  +  2H⁺  +  SO₄²⁻  ---->    BaSO₄  +  2H₂O

now. there are no spectator ion so net ionic equation is same :

Ba²⁺  +  2OH⁻ +  2H⁺  +  SO₄²⁻   ---->   BaSO₄  +  2H₂O

Thus, The net ionic equation is :

Ba²⁺  +  2OH⁻ +  2H⁺  +  SO₄²⁻   ---->   BaSO₄  +  2H₂O

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Two different atoms have nine protons each and the same mass. However, one is neutral while the other has a negative charge then the atomic structure of the both atom are of same element but one of them is electrically neutral and other has a stable electronic configuration

An atom is said to be neutral because it has an equal number of electron and proton in it  and if two different atom have nine proton each and same the mass but one is neutral while the other has a negative charge and the mass of an atom is determined by the number of proton and neutron is present in its nucleus and since both the given atom have 9 proton and the same mass and they must also have the same number of neutron

This implies both the atom have the same nucleus but different charges so it can be concluded that they both the atom of the same element but one of them is electrically neutral and other has stable electronic configuration

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The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.

Considering the question given above, the following data were obtained:

Empirical formula is CH₂O

Molar mass of compound = 150 g/mol

Scaling factor (n) =?

Empirical formula × n = molar mass

[CH₂O]n = 150

[12 + (2×1) + 16]n = 150

[12 + 2 + 16]n = 150

30n = 150

Divide both sides by 30

n = 5

Therefore, the scaling factor is 5

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Answer:

The scale factor is 5. The formula is CH2O.

Multiply each by 5.

So:

C (there is only one)= 1×5

H (there are 2)= 2×5

O(there is only one)= 1×5

Equalling= C5H10O5

The percentage error of the above question is -2.03%.

The percentage error is defined as the approximation error which is present in data value is the discrepancy between an some approximation and exact value to it. This error can also be expressed as a relative error or an absolute error. An approximation error can occur because of the measurement error or computing machine precision.

Make sure in numerator the units off all the digit must be same.

Mathematically, we defined as

Percentage error = (change in value / original value) × 100

(-267.6 - (-273.15) )

= 0. 020

= 2. 020/ (-273.15) × 100

= -2. 03 %

Thus, we concluded that the percentage error of the above question is -2.03%.

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The standard potential for the galvanic cell at 25°C is 1.98 V.

A galvanic cell or an electrochemical cell is a cell that converts the chemical energy of the reactions occurring within it to electrical energy.

The galvanic cell is able to convert chemical energy to electrical energy as a result of the redox reactions occurring within the cell.

The standard potential for the given galvanic cell at 25°C is calculated as follows

Standard reduction potentials:

Ti³⁺ + 3e⁻ ---> Ti; E° = − 1.21 V (anode)

Fe³⁺⁺+ e⁻--> Fe²⁺ ; E° = 0.77 volts (cathode)

Eºcell = 0.77 V - (-1.21 V)

Eºcell = 1.98 V

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Option is the right response because it indicates a synthesis reaction (D) 2Na+Cl2 > 2NaCl.

Synthesis reactions are those that take place when two distinct molecules or atoms interact to create a new chemical or molecule. Whenever a synthesis reaction takes place, energy is often released, as well as the process is exothermic. whenever two or more components (compounds or elements) mix to create a new product, a compound having new qualities. They synthesize to create a new material, which is why the process is known as a synthesis.

Bonds connecting two substances are formed during synthesis reactions. As a result, you may want to think about synthesis reactions as processes that help your body create things. Because of this, we can see that synthesis reactions are crucial for both body growth and tissue healing.

A descriptive statement over ranges of selected variables for input and output is the basis for functional synthesis (FS), which tries to produce an implementation. As is customary, FS tasks were formulated as "all exists" equations, wherein input variables are quantified across the board & output variables are quantified existentially.

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Answer:

C+02 > CO2

Explanation:

hope this helps-

Answer: -207936x>112+2x+83

The concentration of the dilute sulfuric acid is 0.047  mol dm-3.

We know that a neutralization reaction has to do with the kind of reaction that occurs between an acid and a base. The acid is made to react with the base and the product of the reaction would be salt and water only. We can now be able to find  the concentration of the dilute sulfuric acid in mol dm-3 form the procedure that have been laid down below.

Concentration of the base [tex]C_{B}[/tex] =  0.100mol dm-3

Volume of the base [tex]V_{B}[/tex]=  25.00cm^3

Concentration of the acid [tex]C_{A}[/tex]  = ?

Volume of the acid [tex]V_{A}[/tex] = 26.60cm^3

Number of moles of the acid [tex]N_{A}[/tex] = 1

Number of moles of the base [tex]N_{B}[/tex] = 2

Now;

[tex]C_{A}[/tex] [tex]V_{A}[/tex]/ [tex]C_{B}[/tex] [tex]V_{B}[/tex] =  [tex]N_{A}[/tex]/ [tex]N_{B}[/tex]

[tex]C_{A}[/tex] = 0.100mol dm-3 *  25.00cm^3  * 1/26.60cm^3 * 2

[tex]C_{A}[/tex] = 2.5/53.2

[tex]C_{A}[/tex] = 0.047 M

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Lewis structure of CH₃-CCH and then hybridization states for the three central atoms is sp³sp³ and sp

A Lewis structure is a very simplified representation of the valance shell electron in a molecule and it is used to show how the electron are arranged around individual atom in a molecule and in propyne there is 3 carbon and in that one carbon is triply bonded so this triply bonded carbon is sp and 2 singly bonded are sp³ hybridized

And the Lewis structure of propyne are

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The net ionic equation of the reaction as it is shown have been given here by the equation; [tex]Cu^+(aq) + Cl^-(aq) ---- > CuCl(s)[/tex]

The term net ionic equation has to do with the equation that shows the manner in which we are able to convey the information that concerns the ions that do not undergo a change in the reaction.

In this case, we have the reaction that occurs between ammonium chloride and copper II acetate which would produce a copper I chloride and an ammonium acetate product. The net ionic equation would now be;

[tex]Cu^+(aq) + Cl^-(aq) ---- > CuCl(s)[/tex]

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Answer:

2 of the children's feet will be webbed, and the other 2 will have paws.

Explanation:

The dominant genes of the Mother will override the recessive genes of the Father, since there isn't 2 of the recessive genes, except for on the other 2 children. If there was a dominant gene, it would have at least 1 capital letter, and that dominant gene would prevent the recessive (lowercase) letter from showing up.

The volume of the water produced is obtained as 0.01422L.

We know that a combustion reaction is one in which a substance is burnt in oxygen. When we burn the substance in oxygen, heat is evolved and this can be seen as a change in the temperature of the system.

Now;

We must find the number of moles of each of the reactants so that we can be able to determine the limiting reactant.

Volume of methanol =  25.0 mL

Density of methanol = 0.850 g/mL

Mass of methanol = Density * volume

= 0.850 g/mL * 25.0 mL

= 21.25 g

Number of moles of methanol= 21.25 g/32 g/mol

= 0.66 moles

Volume of oxygen = 12.5 L

If 22.4 L of oxygen is occupied by 1 mole

12.5 L  is occupied by 12.5 L  * 1 mole/22.4 L

= 0.59 moles

If 2 moles of methanol reacts with 3  moles of oxygen

0.66 moles of methanol reacts with  0.66 moles  * 3 moles/2 moles

= 0.99 moles

Hence oxygen is the limiting reactant.

If 3 moles of oxygen produces 4 moles of water

0.59 moles of oxygen produces 0.59 moles * 4 moles/ 3 moles

= 0.79 moles

Mass of water =  0.79 moles * 18 g/mol = 14.22 g

Volume of the water = mass/density

= 14.22 g/1.00 g/mL

= 14.22 mL or 0.01422L

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The volume occupied by the given mass of iron is 0.83 [tex]cm^{3}[/tex].

The term specific gravity has to do with the ratio of the density of an object to the density of water. We must note that density of water is the bench mark that have been used to obtain the densities of every other substances hence it was assigned a density of 1.00 g/ [tex]cm^{3}[/tex].

Now we know from the question that;

Density of water =  1.00 g/ [tex]cm^{3}[/tex]

Specific gravity of iron = 7.87

Mass of the iron = 6.50 g

Density of iron = Specific gravity * density of water =  7.87 * 1.00 g/ [tex]cm^{3}[/tex]

=   7.87 g/ [tex]cm^{3}[/tex]

Given that;

Density = mass/volume

volume = mass/Density

volume = 6.50 g/7.87 g/ [tex]cm^{3}[/tex]

Volume = 0.83  [tex]cm^{3}[/tex]

We can see that from the calculations, the density of the iron as is clear in the procedure is 7.87 g/cm3  and it has a volume of 0.83 cm3 .

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Answer:

Carbon has the greatest ionization energy in that group.

Explanation:

I don't know if this is helpful but my teacher used ice cream to explain ionization energy to us. Imagine an ice cream cone standing up straight, ionization energy decreases as you go down, just like how the ice cream cone gets smaller as you go down cause the base of the cone is just a small tip. If you imagine an ice cream cone falling over then it could now be sideways and ionization energy increases from left to right across the periodic table, just like the ice cream cone begins small at the tip and as you go to the right it increases in size.

Conducting an autopsy means Jacob is basically dissecting human  bodies to determine how someone died.

An autopsy, also known as a post-mortem examination, is a specialized surgical procedure used to determine the cause and manner of death. The cause of death is generally the medical reason explaining why a patient passed. The manner of death is usually the circumstances surrounding the death.

What we learn from autopsies allows clinicians to better understand the disease processes, accurately diagnose diseases, improve therapy, and also potentially aid other patients who are currently suffering from a similar disease. There are many reasons why families choose to pursue having an autopsy done. Consent for an autopsy includes diagnostic, education, quality improvement, and research.

It is mostly used by the law enforcements as well to know also catch the culprits.

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Radiation is produced when unstable or radioactive atoms through the process of becoming stable. We refer to this process as radioactive decay over time. Two protons and two neutrons are lost from the nucleus as a result of alpha decay.

An unstable nucleus releases radiation and changes into the nucleus of one or more additional elements during a nuclear decay process, also known as radioactive decay.

The ensuing offspring nuclei are less energetic and heavier than the parent nucleus that underwent decay, making them more stable.

For example, by producing an alpha particle, the unstable uranium-238 nucleus naturally decays into a thorium-234 nucleus. The most prevalent radioactive decay processes are decay, emission, decay, positron emission, and electron capture.

Thus, Radiation is produced when unstable or radioactive atoms through the process of becoming stable.

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In silicon dioxide the number of the covalent bonds are there between each silicon atom with oxygen atoms is four.

In the silicon dioxide the total number of covalent bond is four between the each silicon atom with the oxygen atoms. The covalent bond is form when the two atoms mutually share the electrons and bond together. the compound which form covalent bond is called as covalent bond. the silicon dioxide form covalent bond because the electronegative difference between silicon and the oxygen is not much.

Thus, In silicon dioxide the number of the covalent bonds are there between each silicon atom with oxygen atoms is four.

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The mass of the zinc II hydroxide produced is 22.77 g.

It is common that we use the stoichiometry of a reaction to be able to obtain the parameters that have to do with the reaction. In his case, we already have the balanced reaction equation of this reaction and this is our basic stock in trade for the task that is ahead of us.

Now we have; 2 NaOH(aq) + Zn(NO₃)₂(aq) → Zn(OH)₂ (s) + 2 NaNO₃ (aq)

Number of moles of the sodium hydroxide =  18.5 g/40 g/mol = 0.46 moles

Number of moles of the zinc II nitrate solution = 1.00 M * 0.800 L = 0.8 moles

If 2 moles of the sodium hydroxide reacts with 1 mole of the zinc II nitrate

0.46 moles  of the sodium hydroxide reacts with; 0.46 moles * 1 mole/ 2 moles

= 0.23 moles

Hence the sodium hydroxide is the limiting reactant.

Thus;

2 mole of sodium hydroxide produces 1 mole of zinc II hydroxide

0.46 moles of sodium hydroxide produces 0.46 moles  * 1 mole/2 moles

= 0.23 moles

Mass of the  zinc II hydroxide =  0.23 moles * 99 g/mol

= 22.77 g

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The words "You have the right to remain silent.” means Evan is being read his Miranda rights, option C.

Miranda rights are warnings issued by law enforcements to individuals in custody to protect their rights as part of the criminal procedure rule. These rights were created in 1966 consequently by the Miranda vs Arizona supreme court case.

The Miranda warning contains the words "You have the right to remain silent. Anything you say or do may be used against you in the court of law. You have the right to an attorney.” When the police officers read this to Evan, it was his Miranda rights.

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Answer: Between non-metals

Explanation:

The study of analytical chemistry includes Crystal Structures of matter. Therefore, option (C) is correct.

Analytical chemistry can be described as the studies and uses of instruments and methods to identify, separate, and quantify matter. In practice, identification, or quantification can constitute the analysis or be combined with another method.

Qualitative analysis is related to identifying analytes, while quantitative analysis determines the amount or concentration. Analytical chemistry contains classical chemical methods and instrumental methods.

Classical qualitative methods are used for separations such as precipitation, distillation, and extraction. Identification is based on differences in odor, color, melting and boiling point, solubility, radioactivity, or reactivity.

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Answer:

2-pentene

Explanation:

On the 2nd Carbon we see a C=C, carbon with double bonds have the suffix -ene.