Round your answer to 3 significant figures
ft
4.30 miles
1 mi = 5280 ft

The heat in KG needed to warm up 1.25 pounds of ice from -5.00 Fahrenheit to 135 Fahrenheit specific heat for water 1.00 cal/g C is 347.1 kJ

First, we need to convert the given values to the metric system, which is the standard system for scientific calculations:

1.25 pounds = 0.567 kilograms (1 pound = 0.453592 kilograms)

-5.00 Fahrenheit = -20.56 Celsius (using the formula (°F - 32) x 5/9 = °C)

135 Fahrenheit = 57.22 Celsius

Next, we need to calculate the amount of heat required to warm up the ice from -20.56 °C to 0 °C (the melting point of ice) and then to warm up the resulting water from 0 °C to 57.22 °C:

Heating ice from -20.56 °C to 0 °C:

Heat required = mass x specific heat x

= 23,464.27 J

Melting ice to water at 0 °C:

Heat required = mass x heat of fusion of ice

Heat required = 0.567 kg x 334,000 J/kg

Heat required = 189,678 J

Heating water from 0 °C to 57.22 °C:

Heat required = mass x specific heat x temperature change

Heat required = 0.567 kg x 4.184 J/g°C x (57.22 - 0)

Heat required = 133,951.13 J

The total heat required to warm up 1.25 pounds of ice from -5.00 Fahrenheit to 135 Fahrenheit is the sum of the heat required in each step:

Total heat required = 23,464.27 J + 189,678 J + 133,951.13 J

Total heat required = 347,093.4 J

Finally, we can convert the result to kilojoules (kJ) by dividing by 1000:

Total heat required = 347.0934 kJ

Therefore, approximately 347.1 kJ of heat is needed to warm up 1.25 pounds of ice from -5.00 Fahrenheit to 135 Fahrenheit.

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A. They have performed an experiment once and reported their findings.

Explanation:

C option i think but I didn't know

Answer:

c or b

Explanation:

brainiest

Answer:

Zero

Explanation:

Hello,

The question require us to calculate the mass of nitrogen present in aluminium carbonate.

This can easily be calculated using Avogadro's number as a constant with some minor calculations but however in this case, we can't because there's no single atom of nitrogen present in aluminium carbonate hence we can't calculate the mass of nitrogen present in it.

Chemical formula of aluminium carbonate = Al₂(CO₃)₃.

From the above chemical formula, we can see that there's no single atom of nitrogen present in the formula hence the mass of nitrogen present in aluminium carbonate that contains 1.23×10²³ carbon atoms is zero.

The concentration (molarity) of the final NaCl solution is 175 M.

To find the concentration (molarity) of the final NaCl solution, we can use the equation:

M1V1 = M2V2

Where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

In this case, we have an initial NaCl solution with a concentration of 2.5 M and a volume of 350 mL (0.350 L). We are diluting this solution to a total volume of 5.0 mL (0.005 L).

Plugging these values into the equation, we have:

(2.5 M) * (0.350 L) = M2 * (0.005 L)

Simplifying the equation:

0.875 = 0.005 * M2

Dividing both sides by 0.005:

M2 = 0.875 / 0.005

M2 = 175M

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Answer:

clean air

Explanation:

Answer:

4 or 3 atoms; leaning towards 4 more

Explanation:

Answer:

3 atoms

Explanation:

The volume of the lead is 2.2 mL

The term density refers to the ratio of the mass to the volume of a body. We know that from the question, the following are the parameters that we have been given;

Density of lead = 11.342 g/ml

Mass of lead = 25.00 g

Volume of lead = ??

We can write that;

Density = mass/volume

Volume = mass/Density

Volume = 25.00 g/ 11.342 g/ml

= 2.2 mL

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Answer:

Ketones and ketoacids are alternative fuels for the body that are made when glucose is in short supply. They are made in the liver from the breakdown of fats. Ketones are formed when there is not enough sugar or glucose to supply the body's fuel needs. This occurs overnight, and during dieting or fasting.

Explanation:

Answer:

Because it is dissolving and has pigment.  

Explanation:

Answer:

The solvated electron is responsible for a great deal of radiation chemistry. Alkali metals dissolve in liquid ammonia giving deep blue solutions which conduct electricity . The blue colour of the solution is due to ammoniated electrons which absorb energy in the visible region of light.

Acidic oxides are Carbon dioxide(\(CO_{2}\)), Phosphorus pentoxide(\(P_{2}$O_{5}\)) and Sulfur dioxide(\(S$O_{2}\) ).

Basic oxide are Magnesium Oxide(MgO).

Amphoteric oxides are Tin(Stannum) Oxide(SnO), Antimony trioxide(\(Sb_{2} $O_{3}\)), Aluminum oxide(\(Al_{2} O_{3}\) ) and Beryllium oxide(BeO).

Magnesium Oxide(MgO) is a basic oxide.

Magnesium is a metal that, like the majority of metals, forms simple oxides.

Tin(Stannum) Oxide(SnO) is amphoteric oxide.

Since SnO reacts with both HCl (an acid) and NaOH (a base) to produce salt and water, its amphoteric nature may be demonstrated.

Carbon dioxide(\(CO_{2}\)) itself is not an acid, because it does not contain hydrogen ions (H +), but instead transforms into carbonic acid when dissolved in water. Water and carbon dioxide combine to generate carbonic acid, which makes the solution acidic.

Phosphorus pentoxide(\(P_{2}$O_{5}\)) is an acidic oxide.

Because it is an anhydride of phosphoric acid, phosphorus pentoxide is an acidic oxide that is employed as a desiccating and dehydrating agent.

Antimony trioxide(\(Sb_{2} $O_{3}\)) is an amphoteric.

It dissolves in aqueous sodium hydroxide solution to produce the trihydrate of the meta-antimonite \(NaSbO_{2}\).

Sulfur dioxide(\(S$O_{2}\) ) is an acidic oxide.

\(S$O_{2}\)  occurs spontaneously during volcanic eruptions and is mostly caused by the burning of fossil fuels. The lungs can be harmed by \(S$O_{2}\)  inhalation.

Aluminum oxide(\(Al_{2} O_{3}\) ) is an amphoteric oxide'

This substance possesses both acidic and basic properties. The other reactant in the chemical reaction determines whether \(Al_{2} O_{3}\) is basic or acidic.

Beryllium oxide(BeO) is an amphoteric oxide.

While most group II elements create basic oxide, BeO is an amphoteric oxide.

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Answer:

Explanation:

From the given information:

The energy of photons can be determined by using the formula:

\(E = \dfrac{hc}{\lambda}\)

where;

planck's constant (h) = \(6.63 \times 10^ {-34}\)

speed oflight (c) = \(3.0 \times 10^8 \ m/s\)

wavelength λ = 58.4 nm

\(E = \dfrac{6.63 \times 10^{-34} \ J.s \times 3.0 \times 10^8 \ m/s}{58.4 \times 10^{-9 } \ m}\)

\(E =0.34 \times 10^{-17} \ J\)

\(E = 3.40 \times 10^{-18 } \ J\)

To convert the energy of photon to (eV), we have:

\(1 eV = 1.602 \times 10^{-19} \ J\)

Hence

\(3.40 \times 10^{-18 } \ J = \dfrac{1 eV}{1.602 \times 10^{-19 } \ J }\times 3.40 \times 10^{-18 } \ J\)

\(E = 2.12 \times 10 \ eV\)

E = 21.2 eV

b)

The equation that illustrates the process relating to the first ionization is:

\(Hg_{(g)} \to Hg^+ _{(g)} + e^-\)

c)

The 1st ionization energy (I.E) of Hg can be calculated as follows:

Recall that:

I.E  = Initial energy - Kinetic Energy

I₁ (eV) = 21.2 eV - 10.75 eV

I₁ (eV) = 10.45 eV

Since ;

\(1 eV = 1.602 \times 10^{-19} \ J\)

∴

\(10.45 \ eV = \dfrac{1.602 \times 10^{-19 } \ J }{ 1 \ eV}\times 10.45 \ eV\)

Hence; the 1st ionization energy of Hg atom = \(1.67 \times 10^{-18} \ J\)

\(1.67 \times 10^{-21} \ kJ\)

Finally;

\(I_1 \ of \ the \ Hg (kJ/mol) = \dfrac{1.67 \times 10^{-21 \ kJ} \times 6.02 \times 10^{23} \ Hg \ atom }{1 \ Kg \ atom }\)

\(\mathbf{= 1.005 \times 10^3 \ kJ/mol}\)

Answer:

32 K is approx. -241.15° C

An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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Answer:

It's called a subscript.

Explanation:

Subscripts tell you how many atoms of an element are in a compound.

Answer:

Advantages of Renewable Energy Resources

Explanation:Because renewable energies are not burned like fossil fuels, they do not release pollutants into the atmosphere and provide a cleaner, healthier environment. Sources of renewable energy are found everywhere in the world and cannot be depleted.

Answer:

b.exothermic and entropy is decreasing

Answer:

hope it helps...

Explanation:

Along the third type of plate boundary, two plates move laterally and pass each other along giant fractures in Earth's crust. Transform faults are so named because they are linked to other types of plate boundaries. The majority of transform faults link the offset segments of oceanic ridges.

Answer: .819 Moles of Air

Explanation: To solve this problem, we will use the Ideal Gas Law which states that PV=nRT. P represents pressure or internal pressure, V is volume, T is temperature, n is moles of a gas, and R is the Universal Gas Constant. For the ideal gas law, R is .08206. R is 8.314 for any other calculation. We are solving for the moles of gas. The gas in this case is air which is a mixture of gases but that isn't important.

Our givens are P = 7.3 atm, V = 2.67 L and T = 17.0°C. We convert T to Kelvin because the Ideal Gas Law requires that. We simply add 273 to the value in Celcius to convert it to Kelvin. Our T is now 290 K. We also know R is our Universal Gas Constant. We can now plug into the law.

(7.3 atm)(2.67 L) = n(.08206)(290 K)

n = ((7.3 atm)(2.67 L))/(.08206)(290 K)

n = .819 moles of air

Hope this helps!

7.19 is pKnet for the net reaction in which water plus dissolved carbon dioxide form hydrogen ions plus bicarbonate ions

The balanced reaction would be: H+ + HCO₃- ⇌ H₂CO₃

The equilibrium constant for the reaction is:

Keq = [H₂CO₃]/[H+][HCO₃-] = 10^(pKnet) = 7.94 × 10⁻⁷

Using the equilibrium constant, we can set up an expression for x:

Keq = [H₂CO₃]/[H+][HCO₃-] = x/[(2.48 × 10⁻² - x)(1.8 × 10⁻²)]

x = 6.43 × 10 ⁻⁸ M

Therefore, the final concentration of H+ is 6.43 × 10⁻⁸ M, and the pH is:

pH = -log[H+] = -log(6.43 × 10⁻⁸) = 7.19

So the pH decreases from the average value of 7.4 to 7.19

The acidity or basicity of a solution is measured by its pH. It is the concentration of hydrogen ions in the solution as a negative logarithm (base 10) The pH scale ranges from 0 to 14, with 0 representing the most acidic condition, 7 representing neutral conditions, and 14 representing the most basic.

The total amount of dissolved inorganic carbon in a solution, including bicarbonate ions and carbon dioxide , is referred to as the carbonate pool. Blood plasma contains the carbonate pool, which serves as a buffer and contributes to pH stability in biological systems.

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Answer: chemical weathering

Explanation: Chemical weathering is different from mechanical weathering because the rock changes, not just in size of pieces, but in composition. That is, one type of mineral changes into a different mineral. Chemical weathering works through chemical reactions that cause changes in the minerals.

Answer:

I am not very sure but I think it's chemical weathering

Answer:

The number of proton in an atom is equal to the atomic number of that element. Thus, Number of protons = Atomic number ( Z )

Answer:

The mass of Carbon-12 is exactly 12 amu. But, that is not the number that is reported in your periodic table. Carbon as it exists in nature is not all carbon-12. There is some small amount of carbon-13 and even traces of carbon-14 in there. The periodic table reports the average mass of the carbon as it is found in nature, not that of pure carbon-12. The average mass of carbon is slightly heaver than carbon-12, because of the slight amounts of those heaver isotopes of carbon in nature.

Mark me as brainliest please

Explanation:

Answer:

A botfly that lays an egg in the skin of an animal when the larvae hatches from the egg, it burrows deep into the skin. The animal that may become sick from having the larvae under its skin is called Mutualism.

Explanation:

The animal is the host while the botfly is the parasite. A mutualism in which one mutualistic partner removes parasites, as well as dead or diseased skin from another, in return receiving a steady supply of food is called Pollination. Nearly all pollination services involve a mutualism that has evolved over millions of years. Another example is reproduction.

Answer:

A triple bond, because they overlap orbitals to share three pairs of electrons.

Explanation:

hey there,

< Draw out the Lewis diagram. You will notice there are 3 bonds, and a pair of electrons left on each nitrogen. The amount of electrons being shared between them would now be 6. Here is how it would actually look like:

(image at bottom) >

Hope this helped! Feel free to ask anything else.

Nitrogen atoms in N2 forms a triple bond, because they overlap orbitals to share three pairs of electrons.

A covalent bond is formed by sharing of electrons in a atom. A covalent bond could be a single bond or a multiple bond. Nitrogen has five electrons in its outermost shell. Three of these are involved in bond formation while two of these constitute lone pairs which are localized on the nitrogen atom.

From the above explanation, nitrogen atoms in N2 forms a triple bond, because they overlap orbitals to share three pairs of electrons.

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ΔH for the solution process is -44.4 kJ/mol

Temperature is the measure of hotness or coldness expressed in terms of any of several scales, such as Fahrenheit and Celsius. Temperature shows the direction in which heat power will spontaneously flow.

Mass of solution = mass of NaOH + mass of water

= 6.160 + 100.0 = 106.16 g

Specific heat capacity of solution = specific heat capacity of water = 4.184 J/goC

The heat released by the reaction = heat absorbed by the solution

= mass x specific heat capacity x temperature change of solution

= 106.5 x 4.184 x (37.8 - 21.6)

= 7219 J

Moles of NaOH = mass/molar mass of NaOH

= 6.16/40.00 = 0.154 mol

ΔH = -heat released by reaction/moles of NaOH

= -7219/0.1625

= -4.44 x 104 J/mol = -44.4 kJ/mol

Note that ΔH is negative as the reaction is exothermic and heat is released

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Answer:

a) The lewis dot structure is shown in the image attached to this answer

b) The formal charge on each of the atoms is zero

c) bromine has an oxidation state of +5 while fluorine has an oxidation state of -1

d) 90 degrees

e) Square Pyramidal

f) polar bonds

g) polar molecule

Explanation:

The molecule BrF5 has a formal charge of zero. It exhibits an sp3d2 hybridization state with a square pyramidal geometry. The bond angle in the molecule is 90 degrees. It is a molecule of the type AX5E. The oxidation state of bromine is +5 while that of fluorine is -1.

The Br-F bonds are polar. The overall molecule is polar due to asymmetric charge distribution concentrating on the central atom since the molecule is square pyramidal.