how much heat is required to convert 29g of ice at -4.0c to water vapor at 105

The temperature of the mixture will be approximately 32°C.

To determine the final temperature of the mixture, we can use the principle of conservation of energy. The energy gained or lost by a substance can be calculated using the equation:

Q = m * c * ΔT

where:
Q = heat energy gained or lost
m = mass of the substance
c = specific heat capacity of the substance
ΔT = change in temperature

Let's calculate the heat energy gained or lost by each component separately and then equate them to find the final temperature.

For ice:
m_ice = 40 g
c_ice = 2.09 J/g°C (specific heat capacity of ice)
ΔT_ice = final temperature - 0°C (change in temperature)

Q_ice = m_ice * c_ice * ΔT_ice

For water:
m_water = 80 g
c_water = 4.18 J/g°C (specific heat capacity of water)
ΔT_water = final temperature - 40°C (change in temperature)

Q_water = m_water * c_water * ΔT_water

According to the principle of conservation of energy, the heat lost by the water will be equal to the heat gained by the ice:

Q_water = -Q_ice

Now let's substitute the respective values and solve for the final temperature:

m_water * c_water * ΔT_water = -m_ice * c_ice * ΔT_ice

80 g * 4.18 J/g°C * (final temperature - 40°C) = -40 g * 2.09 J/g°C * (final temperature - 0°C)

Simplifying the equation:

334.4 * (final temperature - 40) = -83.6 * final temperature

334.4 * final temperature - 13376 = -83.6 * final temperature

334.4 * final temperature + 83.6 * final temperature = 13376

418 * final temperature = 13376

final temperature = 13376 / 418

final temperature ≈ 32°C

Therefore, the temperature of the mixture will be approximately 32°C.

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Answer:

Choose three different light levels, and place four identical plants under each light level to observe the light’s effect on multiple plants.

Explanation:

Answer:

Explanation:

EDMENTUM

The Lewis structure for ozone contains a central oxygen atom that has a double bond to one oxygen atom and a single bond with the other oxygen atom. The resonance structure of the ozone is shown in the attached figure below.

The oxygen molecule has a valency of -2. It can form two-sigma bonds or covalent bonds with the other atoms. Oxygen contains three lone pairs to form π bonds with other atoms. Ozone contains all three oxygen atoms and is a dihedral molecule with sp² hybridization.

Lewis structure is generally based on the octet rule which states that there should be eight electrons in the valence shell or orbit of an atom for a stable molecule.

The lone pair on the central oxygen atom repels the electrons in the two side bonds and adopt a bent molecular geometry. The expected geometry is the trigonal planar with a bond angle is 120°.

In an ozone molecule, six valence electrons for each molecule of Oxygen so the total number of valence electrons is 6 × 3 = 18. As both Oxygen atoms on the sides have the same electronegativity, therefore, the double bond keeps on shifting from both causing resonances.

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100 is the protonation to deprotonation ratio of carbonic acid molecules.

Mathematically, HA/A = 100 represents the ratio of the acid's protonated to deprotonated state.

What is the proportion of the acid's deprotonated to protonated form?

Typically, the formula for Calculating pH is as follows: pH = pKa - log(HA/A).

pH is calculated as pKa - log(HA/A).

solving the ratio with some algebra

pKa log = pH + log fracHAA pKa - pH log HA/A = 8 – 6 log. HA/A=2

In order to get rid of the log, discount everything by ten points (log is base 10)

10 (log H/A) = 10 (2 HA/A) = 10 (2 HA/A) = 100

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Answer:

Calculate the number of moles of NaOH:

molar mass of NaOH = 23.0 g/mol (Na) + 16.0 g/mol (O) + 1.0 g/mol (H) = 40.0 g/mol

moles of NaOH = mass / molar mass = 28.1 g / 40.0 g/mol = 0.7025 mol

Use stoichiometry to determine the number of moles of Na2SO4 produced:

From the balanced chemical equation, we see that 2 moles of NaOH react to form 1 mole of Na2SO4, so:

moles of Na2SO4 = 0.7025 mol NaOH × (1 mol Na2SO4 / 2 mol NaOH) = 0.35125 mol Na2SO4

Therefore, 28.1 g of sodium hydroxide will produce 0.35125 mol of sodium sulfate.

Explanation:

The option that describes a situation in which reduction occurs is Cl₂ becoming Cl⁻

In chemistry, reduction means a class of chemical reactions in which the number of electrons associated with an atom or group is increased.

A compound that accepts electrons is said to be reduced.

Situations in which reduction occurs include:

Cl₂ ⇒Cl⁻

When reduction occurs, the oxidation number (superindex) appears to decrease that number. In this case 2+ becomes 1-.

Note:

As with other problems, a decreasing oxidation number means that the compound or element is being reduced (gaining electrons), while an increasing oxidation number means it is being oxidized (losing electrons). increase.

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The volume of the radiator solution formed with the 197 mL of antifreeze is 788 mL.

A percentage is given as the respective ratio of the quantity present with respect to others.

The solution of 25% v/v can be depicting the presence of a 25% volume of antifreeze in the radiator solution.

The volume of the radiator solution has 197 mL of antifreeze. The total volume of the solution suppose is x.

25% of x = 197 mL

25/100 * x = 197

x = 788 mL

The volume of the radiator solution formed with 25% v/v antifreeze is 788 mL.

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Answer: C not really sure thoo

Because of their different longitude.

The maximum mass of water that could be produced by the chemical reaction is 162 g.

The given chemical equation is: 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)In the chemical reaction of liquid octane with gaseous oxygen, the products are gaseous carbon dioxide and gaseous water.According to the balanced chemical equation, 2 moles of C8H18 react with 25 moles of O2 to form 18 moles of H2O.So, 1 mole of C8H18 react with 25/2 = 12.5 moles of O2 to form 9 moles of H2O.The molar mass of C8H18 is 114 g/mol. So, the number of moles in 17 g of C8H18 is:17 g / 114 g/mol = 0.149 molThe molar mass of O2 is 32 g/mol. So, the number of moles in 112 g of O2 is:112 g / 32 g/mol = 3.5 molFrom the balanced chemical equation, 1 mole of C8H18 react with 12.5 moles of O2 to form 9 moles of H2O.So, the number of moles of O2 required to react with 0.149 mol of C8H18 to form H2O is:(12.5 mol / 1 mol) × (0.149 mol / 2 mol) = 0.935 molThe maximum number of moles of H2O that can be produced from 0.149 mol of C8H18 and 0.935 mol of O2 is 9 mol.So, the mass of water produced from 17 g of C8H18 and 112 g of O2 is:9 mol × 18 g/mol = 162 g

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Statement that shows that the total energy of a system remains constant and is conserved would confirm the law of conservation of energy.

What is law of conservation?

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. Therefore, any statement that shows that the total energy of a system remains constant and is conserved would confirm the law of conservation of energy.

Here are some examples of statements that confirm the law of conservation of energy:

All of these statements confirm the law of conservation of energy by showing that the total energy of a system is conserved over time.

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Complete question is: "The total energy of a system remains constant and is conserved" statement would confirm the law of conservation of energy.

Option b is the correct answer. Nucleic acid is a type of biochemical is shown in this illustration.

The representation gave is an improved on variant of the design of a nucleotide, which is a structure block of nucleic acids like DNA and RNA. The nucleotide comprises of three parts: a sugar particle (displayed in the representation as CH2OH), a nitrogenous base (not displayed in this delineation), and a phosphate bunch (displayed in the representation as - O-P=O). The phosphate bunch is adversely charged and can shape hydrogen bonds with different nucleotides to make the foundation of the nucleic corrosive strand. The plan of nucleotides and the arrangement of the nitrogenous bases decide the hereditary code and capability of the nucleic corrosive.

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Answer:

Life on Earth depends on energy coming from the Sun. About half the light reaching Earth's atmosphere passes through the air and clouds to the surface, where it is absorbed and then radiated upward in the form of infrared heat. About 90 percent of this heat is then absorbed by the greenhouse gases and radiated back toward the surface. Scientists attribute the global warming trend observed since the mid 20th century to the human expansion of the "greenhouse effect"  warming that results when the atmosphere traps heat radiating from Earth toward space.

Certain gases in the atmosphere block heat from escaping. Air pollution is the main cause of rise in temperature over the past century. Due to increase in the industrialization in different countries of the world and also burning of more fossil fuels in the engines of vehicles and jets are the main reasons for increasing global temperature. On Earth, human activities are changing the natural greenhouse. Over the last century the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2. To a lesser extent, the clearing of land for agriculture, industry, and other human activities has increased concentrations of greenhouse gases.

Climate extremes, such as droughts, floods and extreme temperatures, can lead to crop losses and threaten the livelihoods of agricultural producers and the food security of communities worldwide. Depending on the crop and ecosystem, weeds, pests, and fungi can also thrive under warmer temperatures, wetter climates, and increased CO2 levels, and climate change will likely increase weeds and pests.

Why does burning fossil fuel affect the environment?

How does the atmosphere play into this all?

How do cars affect the global climate?

How do greenhouse gases such as carbon dioxide cause global warming?

Explanation:

When car burns gasoline, it converts chemical energy into mechanical energy. This is according to the law of conservation of energy.  

The law of conservation of energy states that energy is neither created nor destroyed. When people use energy that doesn't disappear. The Energy changes from one form of energy into another form of energy. A car engine burns gasoline. It converts the chemical energy in gasoline into mechanical energy. The mechanical energy is the sum of potential energy and kinetic energy. Energy changes form one into another but the total amount of energy in the universe stays the same. That means that a system always has the same amount of energy if it is not added from the outside.

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Answer:

Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth's surface.

When an airplane is in flight, the air pressure at the under drops.

Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is dispersed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.

As air flows over an airplane wing, the form of the wing creates a low pressure over the wing surface. The low pressure creates lift, which allows the plane to fly.

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Answer:  **

H-N-H

   |

  H

Explanation:

Look at a periodic table to determine how many electrons you need to account for. Hydrogen (H) only has 1 electron, while Nitrogen (N) has 5. We have three Hydrogen atoms and one Nitrogen atom, so the total number of electrons will be 3 * 1 + 5 = 8 e-.

Now, place the center atom, which will be Nitrogen and place the three Hydrogens on three sides of it as above in the answer. You should use single bonds for this. Each single bond is a pair of electrons, so since we have three single bonds so far, we have accounted for 2 * 3 = 6 electrons. However, we need 2 more electrons for the total of 8. We put these electrons in as a lone pair above Nitrogen.

We check to see if everything follows the octet rule: Nitrogen has three single bonds, so that's 6 e-, as well as one lone pair, so that's another 2 e- for a total of 8 e-. Check. Now look at Hydrogen: H is the only element whose full orbital is 2 e-. Each H has a single bond with Nitrogen, so each does have 2 e-.

Thus, we know this is the correct diagram, and we are done.

Explanation:

A bond line structure of a compound has H N H in linear plane and a hydrogen is branching upward, and the compound is H N (H) H. The nitrogen has two dots at its bottom represents a lone pair of electrons. So ,the correct answer is option C.

The correct Lewis structure for ammonia (\(NH_3\)) is option C. It shows a bond line structure with three hydrogen atoms (H) bonded to a central nitrogen atom (N) in a linear plane.

One hydrogen atom branches upward from the plane. Additionally, the nitrogen atom in this structure has two dots at its bottom, indicating a lone pair of electrons. This arrangement follows the octet rule, as nitrogen has formed three covalent bonds with hydrogen, completing its valence shell. The lone pair on nitrogen gives ammonia its characteristic properties.

Thus, option C accurately represents the Lewis structure of ammonia, showing the bonding and lone pair arrangement of its atoms.

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Answer and Explanation: A molecule consisting of central atom with three bond pairs and one lone pair of electrons will have trigonal pyramidal shape.

The "Wakanda speech," six weeks have passed, and the world is still in shock.

Thus, Global leaders and analysts were taken aback by King T'Challa's declaration at the United Nations General Assembly that the Kingdom of Wakanda is not a developing country of textiles, farms, and shepherds with a GDP per person of roughly $760 but rather a technological superpower and Wakanda speech.

The country's widespread employment of cutting-edge magnetic levitation trains, flying machines, opaque holograms, and spinal cord-healing beads has led to the coining of the phrase "uber-developed" nation.

The most watched video ever is currently "Welcome to the Future," an introduction video created by Wakanda's recently established Ministry of Foreign Affairs.

Thus, The "Wakanda speech," six weeks have passed, and the world is still in shock.

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Mumbai is the best as it has the largest population and the closest temp to that of cooking pasta

Mumbai an city in India with an average temperature of 33C and a population of about 21,296,516

Denver a city in Colorado in the USA with a temperature of 5C and a population of 705,576 (2019)

Mexico City  a city in Mexico with a temperature of 12C and a population of 9 Million persons

Therefore, Mumbai is the best as it has the largest population and the closest temperature to that of cooking pasta

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Answer:1

Explanation:

1

The correct answer to this question is "O Water will spread on B and not on A".

This is because the surface energy of surface B (25 mj /m2) is lower than the water surface tension (72.8 mj/m2), while the surface energy of surface A (200 mj /m2) is higher than the water surface tension.

This means that water will spread on the surface with the lower surface energy, which is surface B, but not on the surface with the higher surface energy, which is surface A. The lower the surface energy, the easier it is for water to spread on the surface.

Therefore, the statement "O Water will spread on B and not on A" is true with regard to the spreading of water on surfaces A and B.

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Answer:

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D.

ionic bonding because one atom gains an electron and the other atom loses an electron

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The attractive interactions between atoms and molecules lead to bonding. NaCl shows ionic bonding because an atom gains and other loses an electron. Thus, option D is correct.

The chemical bonds that include the electrostatic attraction and forces to form the linkage between the opposite charges are said to have ionic bonds.

The ionic bonds are characterized by the presence of differences in the electronegativities that allow the opposite charges to interact efficiently. The bonds are formed between negative and positive charges.

The NaCl molecule has ionic bonds as sodium has more electron that tends to donate electrons while the chlorine atoms have one less valence electron that tends to gain an electron.

Therefore, in option D, the NaCl molecule shows ionic bonding as they have cations and anions.

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Answer:

Explanation:

An acid is a substance that can donate protons (H+) to water when dissolved in it, resulting in an increase in the concentration of H+ ions in the solution.

When NaCl (sodium chloride) is dissolved in water, it dissociates into its individual ions, Na+ and Cl-. These ions do not donate protons to water, so NaCl does not form an acid when dissolved in water.

NO2 (nitrogen dioxide) is a neutral compound, it does not donate protons to water and does not form an acid when dissolved in water.

H2SO3 (sulfurous acid) is an acid, when dissolved in water, it donates protons to water and forms H+ ions and SO3- ions.

HCl (hydrochloric acid) is an acid, when dissolved in water it donates protons to water and forms H+ ions and Cl- ions.

So the answer is H2SO3 and HCl are the compounds that would form an acid when dissolved in water as an aqueous solution.

Compared to 2,3,4-trifluoropentane, the nonane's carbon chains are longer.

A substance's molar mass is defined as its molecular weight in grams. By adding the molar masses of a substance's constituent atoms, we may get the substance's molar mass. Then, to convert between mass and the quantity of moles of the material, we may utilize the computed molar mass.

Adding the atomic masses of a particular substance results in the calculation of molar mass. Below each element's symbol on the periodic table is a designation of the mass of that specific element. The molar mass is obtained by averaging the atomic masses obtained from the periodic table.

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The mass of a 8.45 m3 piece of copper is 7537.4 grams.

Mass is described as a dimensionless quantity representing the amount of matter in a particle or object.

density of copper =8.92g/cm^3

volume = 8.45 x 100 cm^3

mass =  (8.45 x 100) x 8.92

mass = 7537.4 grams.

The relationship between mass, density and volume is that density offers a convenient means of obtaining the mass of a body from its volume or vice versa.

This means that the mass is equal to the volume multiplied by the density (M = Vd), while the volume is equal to the mass divided by the density (V = M/d).

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The percentage left is 57%.

We know that a fraction is a part of a whole. Let us in this case take the whole as one and then the fraction that we remove out of it is 3/7. We now have to find the percentage that remains.

Thus'

Fraction that remains = 1 - 3/7 = 4/7

Hence;

Percentage that is left = 4/7 * 100

= 57%

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Answer:

57.4 g/mol

Explanation:

Step 1: Convert 450 cm³ to L

We will use the conversion factors 1 cm³ = 1 mL and 1000 mL = 1 L.

450 cm³ × 1 mL/1 cm³ × 1 L/1 mL = 0.450 L

Step 2: Convert 23 °C to Kelvin

We will use the following expression.

K = °C + 273.15 = 23 + 273.15 = 296 K

Step 3: Calculate the number of moles of the gas

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 700 mmHg × 0.450 L / (62.4 mmHg.L/mol.K) × 296 K = 0.0171 mol

Step 4: Calculate the molar mass of the gas

0.982 g of the gas correspond to 0.0171 moles.

M = 0.982 g/0.0171 mol = 57.4 g/mol

Answer:

0.8878 mol KClO4

Explanation:

Molar mass of KClO4 = 39.0983 + 35.453 + ( 15.9994 x 4 ) = 39.0983 + 35.453 + 63.9976 = 138.5489g/mol

but,

number of moles = mass in grams / molar mass where mass in grams = 123g, molar mass = 138.5489g/mol

number of moles = 123g / 138.5489g/mol = 0.8878mol

Therefore the number of moles present in 123 g of \( KClO_4\) is 0.888 moles.

Given,

The weight of the \( KClO_4\) is 123. grams

molecular weight of \( KClO_4\) is \(39+35.5+16\times4=138.5 g\)

138.5 g of \(KclO_4\) is equal to one mole

Gram molecular wt. of a substance is equal to one mole

No. of moles = \(\frac{Wt}{GMW} \)

123 g of \(KClO_4\) is equal to \(\frac{123}{138.5}=0.888 moles \)

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The stable form of Nitrogen is N-14 and N-15.

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