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Samantha noticed her hands get colder in winter than other exposed parts of her body such as her face and neck.

Answer:

A. write balanced chemical equation (including states), for this process.

Explanation:

Almost all hydrocarbon 'burn' reactions involve oxygen; it's by far the most reactive substance in air.  

Hydrocarbon combustions always involve  

[some hydrocarbon] + oxygen --> carbon dioxide + steam.  

C6H6(l) + O2 (g)--> CO2 (g)+ H2O (g)

Balance carbon, six on each side:  

C6H6(l) + O2 (g)--> 6CO2 (g)+ H2O (g)

Balance hydrogen, six on each side:  

C6H6(l) + O2 (g)--> 6CO2(g) + 3H2O (g)

Now, we have fifteen oxygens on the right and O2 on the left.  

Two ways to deal with that. We can use a fraction:  

C6H6 (l)+ (15/2)O2 (g)--> 6CO2 (g)+ 3H2O (g)

Or, if you prefer to have whole number coefficients, double everything  

to get rid of the fraction:  

2C6H6 (l)+ 15O2 (g)--> 12CO2 (g)+ 6H2O (g)

With the SATP states thrown in...  

C6H6(l) + (15/2)O2(g) --> 6CO2(g) + 3H2O(g)

Answer:

Chemical reaction

Explanation:

Answer: coal and natural gas

Explanation: because it takes a long time for them to form

Answer:

Non renewable resource is fossil fuels that cannot be replaced such as coal and oil

Explanation:

Answer:

is cool is cool goodcripopo

The equilibrium constant of a reaction requires certain environmental variables to remain constant. These variables are pressure, temperature, and concentration. The correct option is A.

An equilibrium constant is a mathematical tool that enables the quantification of the extent of a chemical reaction. The equilibrium constant is symbolized by Keq, and it is utilized to determine the concentration of reactants and products present at equilibrium.

                           This calculation is done using the law of mass action.Keq is defined as the ratio of product concentrations to reactant concentrations in a chemical reaction taking place at equilibrium. The concentrations used in the expression for Keq are equilibrium concentrations.

                                 As a result, Keq is a constant for a given reaction at a specific temperature. Keq is dependent on a variety of environmental variables such as temperature, pressure, and concentration. To keep the equilibrium constant stable, these variables must remain constant.

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Answer:

i hope it will help you

Explanation:

there will be 7 electrons and 9 protons will have 2+ charge.

Answer:

I think it's B

Explanation:

apologies if I get this wrong

Answer:

The correct answer is B. The force of gravity.

Explanation:

Gravity affects all objects falling through the Earth's atmosphere. Gravity pulls down on a falling object.

( I got it on study Island as well )

Answer:

The four elements are most likely halogens which belong to group 7A in the periodic table.

Explanation:

The elements most likely are halogens because they usually display the same pattern of bonding as they are all diatomic molecules that need one electron to fill their outermost shell.

Another thing is that, halogens possess very strong type of ionic bonds which make them very reactive such that they react with metals to form salts. Due to this reason, they are called salt dormers.

There are other properties of these elements too such as: atomic radius, melting and boiling points, electronegativity e.t.c. They may increase or decrease down the group.

The elements belong to group 7A.

Answer:

Explanation:

The four elements are most likely halogens which belong to group 7A in the periodic table

The elements most likely are halogens because they usually display the same pattern of bonding as they are all diatomic molecules that need one electron to fill their outermost shell.

Another thing is that, halogens possess very strong type of ionic bonds which make them very reactive such that they react with metals to form salts. Due to this reason, they are called salt dormers.

There are other properties of these elements too such as: atomic radius, melting and boiling points, electronegativity e.t.c. They may increase or decrease down the group.

The elements belong to group 7A.

They include the folowing;

1. The break-up of firm particles = Endothermic heat absorbing process

2. The break-up of solute fragments = Endothermic heat arresting process

3. The joining of solute and solvent particles = Exothermic heat bearing process

The Enthalpy of Resolution maybe found in this manner including three elements: ΔHsoln = ΔH1 + ΔH2+ ΔH3

1. Break-up of the solute molecules from each one (extending the solute), this is an endothermic response. (ΔH1)

2. Break-up of the financially sound molecules from each one (extending the solid fragments), this is also an endothermic backlash (ΔH2)

In their divided states, the solute and fit fragments are free to attract each one liquid.

3. The exothermic response of the solute and fit resulting in the composition of the resolution. (ΔH3)

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The amount of energy produced per mol is  -2.697 × 10¹⁷ J/mol. The mass of TNT needed to produce the same energy is 227.07 grams. The energy released is -1.15 × 10¹⁵ J per gram.

What is energy released?

The term "energy released" refers to the energy that is released or given off during a chemical reaction or a nuclear reaction. It represents the difference in energy between the reactants and the products.

(a) To calculate the amount of energy produced per mole of the fission reaction, we need to determine the energy released per mole of reaction. This can be obtained from the mass defect of the reactants and products.

Determine the mass defect:

Mass defect = (Mass of reactants) - (Mass of products)

Mass defect = (232 g/mol + 1 g/mol) - (137 g/mol + 97 g/mol + 2 g/mol)

Mass defect = 232 g/mol + 1 g/mol - 137 g/mol - 97 g/mol - 2 g/mol

Mass defect = -3 g/mol

Calculate the energy released per mole using Einstein's mass-energy equation:

E = mc²

E = (-3 g/mol) × (2.998 × 10⁸ m/s)²

E ≈ -2.697 × 10¹⁷ J/mol

The amount of energy produced per mole of the fission reaction is -2.697 × 10¹⁷ J/mol.

(b) The heat of combustion of TNT (C₇H₅N₃O₆ ) is given as 3406 kJ/mol. To find the mass of TNT needed to produce the same energy as 1.000 mol of the fission reaction, we can set up an energy equivalence equation:

3406 kJ/mol = (mass of TNT in grams) × (energy per gram of TNT)

To find the energy per gram of TNT, we divide the heat of combustion by the molar mass of TNT:

Energy per gram of TNT = (3406 kJ/mol) / (227.13 g/mol)

Energy per gram of TNT ≈ 15 kJ/g

Now we can rearrange the energy equivalence equation to solve for the mass of TNT:

mass of TNT in grams = (3406 kJ/mol) / (15 kJ/g)

mass of TNT in grams ≈ 227.07 g

Therefore, 227.07 grams of TNT are needed to produce the same energy as 1.000 mol of the fission reaction.

(c) To calculate the energy released in part (a) per gram of 235 U, we need to convert the energy released per mole (-2.697 × 10¹⁷ J/mol) to energy per gram of 235 U.

Calculate the molar mass of 235 U:

Molar mass of 235 U = 235 g/mol

Convert the energy released per mole to energy per gram of 235 U:

Energy per gram of 235 U = (-2.697 × 10¹⁷ J/mol) / (235 g/mol)

Energy per gram of 235 U ≈ -1.15 × 10¹⁵ J/g

Therefore, the energy released in part (a) is -1.15 × 10¹⁵ J per gram of 235 U.

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Answer: 4P + 3O2 → P4O6

Explanation: plz give brainliest

When the anion gap exceeds 16 mEQ/L, the cause is generally an increase in fixed acids.

When the anion gap, which represents the difference between measured cations and anions in the blood, exceeds 16 mEQ/L, it is typically indicative of an increase in fixed acids. The anion gap is a valuable tool in diagnosing metabolic acidosis and evaluating the acid-base balance in the body.

An increase in fixed acids, such as lactic acid, ketoacids, or toxins, leads to an accumulation of these acidic substances in the blood. This causes a disturbance in the acid-base equilibrium, resulting in metabolic acidosis. Metabolic acidosis occurs when there is either a decrease in bicarbonate (base) or an increase in non-volatile acids (fixed acids) in the body.

An elevated anion gap indicates the presence of unmeasured anions, which are usually the result of increased fixed acids. These fixed acids can arise from various conditions, including diabetic ketoacidosis, lactic acidosis, renal failure, and certain toxic ingestions. By measuring the anion gap, healthcare professionals can identify the underlying cause of metabolic acidosis and guide appropriate treatment.

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The number of mole of ammonium ion, NH₄⁺ in the solution is 0.175 mole

We'll begin by calculating the number of mole of NH₄NO₃ in the solution. This can be obtained as follow:

Volume = 125 mL = 125 / 1000 = 0.125 L

Molarity = 1.40 M

Mole = Molarity x Volume

Mole of NH₄NO₃ = 1.40 × 0.125

Finally, we shall determine the number of mole of ammonium ion, NH₄⁺ in the solution. This can be obtained as follow:

NH₄NO₃(aq) —> NH₄⁺(aq) + NO₃¯(aq)

From the balanced equation above,

1 mole of NH₄NO₃ contains 1 mole of NH₄⁺

Therefore,

0.175 mole of NH₄NO₃ will also contain 0.175 mole of NH₄⁺

Thus, the number of mole of ammonium ion, NH₄⁺ in the solution is 0.175 mole

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The moles of KHP is multiplied by the mole ratio of NaOH to KHP, which is determined by the balanced chemical reaction mentioned above, to determine the number of moles of NaOH.

By dividing the moles of sodium hydroxide by the number of liters of sodium hydroxide solution needed to reach the titration's endpoint, the molarity of the NaOH solution is determined. Concentration in mol/dm3 divided by volume in dm3 equals the solute amount in mol. There is 0.00250 mol of sodium hydroxide, or 0.100 x 0.0250.KHP has a molecular weight of 204.22 g/mol, so we have 4.166 mmol of KHP after dividing its mass by 0.8508. We require the same amount of NaOH, or 4.166 mmol, to titrate it to the equivalence point. For a volume of 4.166 mmol/(0.2535 mmol/mL)=16.43 mL of NaOH, we require 0.2535 mmol/mL.

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True. In second normal form (2NF), a relation must first be in first normal form (1NF), which means it has no repeating groups and each attribute contains atomic values.

In addition, for a relation to be in 2NF, all relation non-key attributes must be dependent on the entire primary key. If some non-key attributes are not determined by the entire primary key, then the relation is not in 2NF.
False. A relation is in 2NF (Second Normal Form) if and only if it is in 1NF (First Normal Form) and all non-key attributes are fully functionally dependent on the entire primary key, not just a part of it. This means that no non-key attributes are determined by a subset of the primary key.A relational table is in third normal form (3NF) if it is already in 2NF and every non-key column is non transitively dependent upon its primary key. In other words, all nonkey attributes are functionally dependent only upon the primary key.

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The product of a synthesis reaction between magnesium metal and nitrogen gas is magnesium nitride (Mg3N2).

In a synthesis reaction, two or more reactants are combined to form a new, more complex product. When magnesium metal reacts with nitrogen gas, the magnesium donates electrons to the nitrogen atoms, forming a strong covalent bond and resulting in the formation of magnesium nitride. The reaction can be represented by the following equation:

                                    3Mg + N2 ⇒ Mg3N2

Magnesium nitride (Mg3N2) is a chemical compound made up of magnesium and nitrogen. It is a white solid that is used in a variety of industrial and scientific applications, such as in the production of high-strength, lightweight alloys for the aerospace and automotive industries, and as a catalyst in chemical reactions.

The synthesis of magnesium nitride from magnesium metal and nitrogen gas is a typical example of a synthesis reaction, where two or more simple substances are combined to form a more complex product. In this reaction, magnesium metal reacts with nitrogen gas to form magnesium nitride. The reaction is exothermic, releasing heat, and is usually performed at high temperatures (around 800-1000°C) in a sealed container under an inert atmosphere to prevent the formation of unwanted by-products.

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Answer:

i will give you all the answers just in case  pls mark brainlist

Explanation:

1.the placement of the Sun at the center of the solar system

2.stars are not a part of our solar system

3.The improve telescope showed scientists that the solar system contained comets.

4.the placement of the Sun at the center of the solar system

5.stars that form constellations

The correct option is b. at an angle; If a bullet passes through glass and leaves an oval-shaped hole, it entered the glass at an angle.

An oval resembles the form, contour, or shape of an egg.

For instance:

Thus, If a bullet passes through glass and leaves an oval-shaped hole, it entered the glass at an angle.

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Answer:

Active transport

Explanation:

Active transport is defined as the movement of ions or molecules from a region of lower concentration into a region of higher concentration by the use of energy. Two examples of active transport include the uptake of glucose in human intestine and the absorption of mineral ions into plant roots.

Active transport requires energy because it involves the movement of molecules against an existing concentration gradient.

To prepare 1 L of a 0.0400 M anserine buffered solution with a pH of 7.20, we can first calculate the isoelectric point (pI) of anserine.

Next, we need to determine the desired pH and the starting pH of the solution. The starting pH of the 0.200 M anserine solution at its pI is 7.00, and the desired pH is 7.20.

We can use the formula for the buffer capacity,

Buffer capacity = (base concentration) / (acid concentration)

The buffer capacity of the anserine solution is:

Buffer capacity = (0.200 M) / (0.300 M) = 2/3

Since the buffer capacity is less than 1, we can add a small amount of NaOH to raise the pH to 7.20 without a significant change in pH. We can calculate the volume of 0.300 M NaOH solution needed to raise the pH by 0.20 units:

Volume of NaOH = (Buffer capacity) * (Change in pH) * (Volume of solution)

= (2/3) * (0.20) * (1 L) = 0.133 L

So, we need to add 0.133 L of 0.300 M HCl to 1 L of 0.200 M anserine solution to reach a pH of 7.20.

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Answer:

just use a calculator

Explanation:

duh

Answer:

44

Explanation:

(16 × 2) + (12 × 1)

so basically 32 plus 12 which equals 44

The concentration in ppm of the solution containing 0.35 mg of fluoride is 5.56 ppm (two significant figures).

To find the concentration in ppm (parts per million) of a solution containing 0.35 mg of fluoride and 63 ml of tap water, we need to use the formula:

Concentration (ppm) = (mass of solute / volume of solution) x \(10^6\)

First, we need to convert the mass of fluoride from milligrams to grams:

0.35 mg = 0.00035 g

Next, we need to convert the volume of tap water from milliliters to liters:

63 ml = 0.063 L

Now we can plug these values into the formula:

Concentration (ppm) = (0.00035 g / 0.063 L) x \(10^6\)

Concentration (ppm) = 5.56 ppm

Therefore, the concentration in ppm of the solution is 5.56 ppm (two significant figures).

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Magnesium and fluorine atoms will most likely form an ionic bond.

Ionic bonds are formed between elements with a large difference in electronegativity, which is the measure of an atom's ability to attract electrons towards itself. Magnesium and fluorine have a difference in electronegativity of 2.13, which is large enough to form an ionic bond.

In ionic bonds, one atom loses electrons and becomes a positively charged ion (cation), while the other atom gains electrons and becomes a negatively charged ion (anion). In this case, magnesium will lose two electrons to become Mg2+ and fluorine will gain one electron to become F-. These two ions will then attract each other electrostatically to form magnesium fluoride (MgF2), which is an ionic compound.

On the other hand, covalent bonds are formed between elements with a small difference in electronegativity, where atoms share electrons to achieve a stable electron configuration. Magnesium and fluorine have a large electronegativity difference, so they are unlikely to share electrons and form a covalent bond. Therefore, magnesium and fluorine will most likely form an ionic bond.

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Answer:

This animal produces offspring that are genetically different from itself.

Explanation:

Answer:

answer is A

This animal produces offspring that are genetically different from itself.

Explanation:

hope this helps!

Answer:

They can travel at the speed of light.

Explanation:

all electromagnetic waves have the same speed which is equal to the speed of the light.

The fact which all electromagnetic waves have in common is that "They can travel at the speed of light".

Electromagnetic radiation is a type of energy waves that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma-rays. Sunlight is also a form of electromagnetic energy, but visible light is only a small portion of the electromagnetic spectrum, which contains a broad range of wavelengths.

In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves. In order from highest to lowest wavelength, the series is just opposite.

Electromagnetic radiations don't require any medium to travel and also travel in speed of light. They have Electric field vector and magnetic field vector that is perpendicular to each other and also are perpendicular to the direction of propagation.

Therefore, The fact which all electromagnetic waves have in common is that "They can travel at the speed of light".

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\(NaNO_3\) is the limiting reactant when 26 mol of \(BaF_2\) is combined with 50 mol of \(NaNO_3\).

The limiting reagent is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

\(BaF_2 + 2NaNO_3\) → \(Ba(NO_3)_2 + 2NaF\)

Moles of \(BaF_2\) = 26

Moles of 2\(NaNO_3\) = 50

1 mole of  \(BaF_2\)  requires 2 moles of \(NaNO_3\).

26 moles of \(BaF_2\) require =2x 26 =52 moles of \(NaNO_3\).

But only 50 moles of \(NaNO_3\) are present.

Hence, \(NaNO_3\) is the limiting reactant.

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Answer:

4m/s² north.

Explanation:

Data obtained from the question include the following:

Mass (m) = 10Kg

Force (F) = 40N North.

Acceleration (a) =...?

Force is simply the product of mass and acceleration. It is represented mathematically as:

Force (F) = Mass (m) x acceleration (a)

F = ma

With the above formula, we can obtain the acceleration of the object as follow:

40 = 10 x a

Divide both side by 10

a = 40/10

a = 4m/s²

Since the force was applied in the north direction, the object will also accelerate in the north direction. Therefore, the acceleration of the object is 4m/s² north.

Heat required : 4.8 kJ

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

The heat needed to raise the temperature

Q = m . c . Δt

1. heat to raise temperature from -20 °C to 0 °C

\(\tt Q=10\times 2.09\times (0-(-20)=418~J\)

2. phase change(ice to water)

\(\tt Q=10\times 333=3330~J\)

3. heat to raise temperature from 0 °C to 25 °C

\(\tt Q=10\times 4.18\times (25-0)=1045~J\)

\(\tt Q~tot=418+3330+1045=4793~J\rightarrow rounding~and~2~sig~figs=4.8~kJ\)

Answer:

Again, Microscopes discovered a lot of things in biology like the prokaryotic cells, Bacteria and Archaea, aswell as parts of an organelle/cell.