How do hydrogen bonds affect heat capacity?

Concentration of the reactants decreases over time as they are used up in the reaction. This means that there are fewer collisions between the reactant particles per unit time, leading to a decrease in the rate of reaction. Additionally, as the reaction progresses, the concentration of the product molecules increases, leading to an increase in the likelihood of the reverse reaction (i.e., CaCl2 + H2O + CO2 → CaCO3 + 2HCl) occurring. This also contributes to a decrease in the rate of the forward reaction over time.

Answer:

b.

Explanation:

Answer:

True

Explanation:

In an alpha decay, the isotope of an element releases two protons and two neutrons. An alpha particle or helium has two protons and two neutrons and hence, in an alpha decay an alpha particle is released.

Hence, the given statement is true

Answer:

13.295 kg

Explanation:

29.25 divided by 2.2 is about 13.295. Feel free to round this.

The emergency response guidebook would be the best source about identifying and properly handling hazardous materials.

Hazardous material is defined as any substance or cloth that when worried in an coincidence and launched in enough quantities poses a chance to humans's fitness, protection, and/or assets.

Find the safety statistics Sheet (SDS) prepared by the manufacturer to determine whether or not a consumer product is hazmat. The Explosives, gases, and flammable liquids. Flammable solids. The genetically modified organisms and the micro-organisms. Infectious materials.

In figuring out where unsafe substances are discovered for your community, bear in mind the five phases of a risky material's “life”—manufacturing, transportation, garage, use, and disposal.

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Answer:

5 significant figures.

Explanation:

The decimal place makes the zeros significant.

Answer:

All substances should be equally soluble (or equally insoluble) in both.

The balanced form of the nuclear equation is as follows; 249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n.

A nuclear equation is process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

According to this question, Californium element is a reactant to produce dubnium and a neutron as products.

However, the law of conservation of mass must be fulfilled by ensuring the mass and atomic numbers of elements in reactant and product side are the same.

249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n

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Answer:

27 moles of sulfuric acid are produced.

Explanation:

The equation for the reaction between nitric acid (HNO3) and sulfuric acid (H2SO4) to form nitration sulfate (HNO3) and water (H2O) is:

2 HNO3 + H2SO4 → H2SO4 + 2 H2O

For every 2 moles of nitric acid that react, 1 mole of sulfuric acid is produced. So, when 54 moles of nitric acid are consumed, 54/2 = 27 moles of sulfuric acid are produced.

Answer:

C

Explanation:

The element gold has a consistent melting point and color regardless of the physical changes. This identifies gold as a pure substance. The correct option is C.

Pure substances are those that are made up of only one type of atom, and nothing is mixed in these substances. They are only one type of particle. They have fixed mass and structure.

Gold is an element that has an atomic number of 79. It is a bright yellow colored and shiny metal. It is used to make an ornament, which is made by mixing other metal to it.

Elements and compounds are subclasses of pure substances. A material that solely contains one type or class of atom is said to be an element. Gold is a pure substance, it is made by one type of atom which is Aurum (Au).

Thus, the correct potion is C. A pure substance.

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Neutrons and protons, commonly called nucleons, are bound together in the dense inner core of an atom, the nucleus, where they account for 99.9 percent of the atom's mass. ... The neutron was discovered in 1932 by the English physicist James Chadwick.

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Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

Thus, They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, according to the stoichiometry of chemical reactions.

In the aforementioned reaction, 2 moles of ammonia are created when 3 moles of hydrogen gas react with 1 mole of nitrogen gas.

In most cases, this reactant dictates when the reaction will end. The reaction stoichiometry can be used to determine the precise quantity of reactant that will be required to react with another element. The limiting agent is determined by the mole ratio rather than the mass of the reactants.

Thus, Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

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The average kinetic energy of the particles is reduced by a factor of (723/819)2 = 0.60, assuming the substance is an ideal gas.

The energy an object possesses as a result of its motion is known as kinetic energy. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The relationship between kinetic energy and an object's mass and square of its velocity is direct.

When an object is moving, it has kinetic energy, which is computed using the formula KE = 1/2mv2, where m is the object's mass and v is its velocity. Calculating the amount of energy required to halt a moving object is just one practical use for the fundamental physics idea of kinetic energy.

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When 0.20 of nicotinic acid is dissolved in 350 ml of water, the ph is 3.05. calculate the Ka value Ka=1.41ₓ10⁻⁵ and percent ionization is 14.1%

One of the water-soluble B vitamins is niacin, sometimes referred to as vitamin B3. Nicotinic acid (pyridine-3-carboxylic acid), nicotinamide (niacinamide or pyridine-3-carboxamide), and similar compounds, such as nicotinamide riboside, are collectively referred to as "niacin."

pH = 3.05

pH=-log[H⁺]

H⁺=10⁻³·⁰⁵

H⁺=0.00089125M

Moles of nicotinic acid in number =2.0ₓ10⁻²

Water volume = 350 mL = 0.0350 L

percent ionization=1.41/100

                               14.1%

A potent basic substance is nicotinic acid (based on its pKa). From microbes to people, all living things have nicotinic acid.

Molarity =Moles/Volume in Liters

             =2.0ₓ10⁻²/0.0350

Molarity = 0.057214M

Nicotinic acid dissocates as follows:

HA⇒[H⁺]+[A⁻]

[H⁺]=0.00089125M

[A⁻]=0.057214M

At equilibrium, [HA] = 0.05714 - 0.00089125 = 0.05624875 M

Ka=[H⁺][A⁻]/[HA]

Ka=(ₓ0.00089125M)(0.057214M)/0.05624875 M

Ka=1.41ₓ10⁻⁵

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Answer:

When the sun's rays strike Earth's surface near the equator, the incoming solar radiation is more direct (nearly perpendicular or closer to a 90˚ angle). Therefore, the solar radiation is concentrated over a smaller surface area, causing warmer temperatures.

Explanation:

The concentration of the NaOH solution required for the reaction given the data is 0.44 M

H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O

From the balanced equation above,

CaVa / CbVb = nA / nB

(0.1 × 22) / (Cb × 10) = 1 / 2

2.2 / (Cb × 10) = 1 / 2

Cross multiply

Cb × 10 = 2.2 × 2

Cb × 10 = 4.4

Divide both side by 10

Cb = 4.4 / 10

Cb = 0.44 M

Thus, the concentration of the NaOH solution is 0.44 M

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Answer:

To calculate original weight - multiply by 2 the number of times one half live has passed.

12 x 2 = 24

24 x 2 = 48

48 x 2 = 96

96 x 2 = 192

original weight = 192g

The angles as shown are supplementary angles because the add up to 180 degrees.

Two angles are said to be supplementary if they add up to 180 degrees. Now we know that the sum of angles on  straight line is 180 degrees. If we look at the image as shown in the image attached, we can see that the angles lie on a straight line.

As such, we can conclude that the angles as shown are supplementary angles because the add up to 180 degrees.

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Answer :

-111°C

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The final temperature of the gas in the balloon is equal to -110.6°C.

Gay-Lussac's law can be described as when the volume of the gas is kept constant then the pressure (P) is directly proportional to the absolute temperature (T in kelvin) of the gas.

The mathematical representation of Gay Lussca's law can be written as follows:

P/T = k

The pressure (P) of a gas is always directly proportional to the temperature (T) of the gas.

P ∝ T                               (where volume  is constant)

\(\frac{P_1}{T_1} =\frac{P_2}{T_2}\)

Where P₁, T₁, P₂, and T₂  are the initial and final pressure and temperature.

The initial temperature of the balloon, T₁ = 25 °C = 25 + 273 = 298 K

The initial pressure of the balloon, P₁  = 2.55 atm

The final pressure of the balloon, P₂ = 1.39 atm

Substituting temperatures and pressures of the gas in the balloon in the above equation:

2.55/298 = 1.39/T₂

T₂ = 162.4 K

T(K) = 273 + T(°C)

T(°C) = 162.4 - 273 = - 110.6°C

Therefore, the final temperature of the gas inside the balloon is -110.6°C.

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Answer:

Explanation:

It is a physical change .

If we start from 10 atm of pressure and - 40 celsius of temperature to 20 atm of pressure and 70 celsius of temperature , it is a change in which pressure increases and temperature also increases that means heat is added up to the gas . If we cool the gas we can retrieve its earlier pressure and temperature .

So it is  a physical change . In physical change , we can retrieve the old position by simple means.

In the balanced equation \(2C_{2} H_{6}\) + \(7 O_{2}\) --> \(4 CO_{2}\) + \(6H_{2}O\) if 21 g of \(C_{2} H_{6}\) reacts with 32 g O₂, C₂H6 is the limiting reactant.

To determine the limiting reactant, we need to compare the amount of each reactant to the stoichiometric ratio in the balanced equation.

Let's calculate the number of moles for each reactant using their molar masses:

For \(C_{2} H_{6}\) (ethane):

Molar mass of \(C_{2} H_{6}\) = 2(12.01 g/mol) + 6(1.01 g/mol) = 30.07 g/mol

Number of moles of C₂H6 = 21 g / 30.07 g/mol ≈ 0.698 mol

For O₂ (oxygen):

Molar mass of O₂ = 2(16.00 g/mol) = 32.00 g/mol

Number of moles of O₂ = 32 g / 32.00 g/mol = 1.00 mol

Next, we compare the moles of each reactant to the stoichiometric ratio in the balanced equation:

2 moles of \(C_{2} H_{6}\) react with 7 moles of O₂ to produce 4 moles of CO₂ and 6 moles of H₂O.

From the given amounts, we have:

0.698 mol \(C_{2} H_{6}\) and 1.00 mol O₂.

Using the stoichiometric ratio, we can calculate the expected amount of CO₂ and H₂O produced for each reactant:

For C₂H6:

Expected moles of CO₂ = 0.698 mol C₂H6 * (4 mol CO₂ / 2 mol C₂H6) = 1.396 mol CO₂

For O₂:

Expected moles of CO₂ = 1.00 mol O₂ * (4 mol CO₂ / 7 mol O₂) ≈ 0.571 mol CO₂

Comparing the expected moles, we see that the calculated amount of CO₂ is greater when used \(C_{2} H_{6}\) as the limiting reactant. Therefore, the limiting reactant in this reaction is \(C_{2} H_{6}\).

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Answer:

The products are: BaCO3 and LiCl, but the reaction will not occur , because BaCO3 is not soluble in water.

Explanation:

To write the products, we have to combine the positive ion of one compound to the negative ion of the other compound.

In BaCl2, Ba+2 is the positive ion (cation) and Cl- is the negative ion (anion).

In Li2Co3, Li+1 is the cation and CO3-2 is the anion.

So, the products will be:

The reaction is balanced, because in each side of the reaction there are: 1 Ba, 2 Cl, 2 Li, 1C and 3 O.

Finally, BaCO3 is insoluble in water, so this reaction will not occur.

Answer:

3.16m

Explanation:

ph = 11

the question tells us that lysine concentration is equal to 10m

while in water lysine has a pka of 10.5

to get the concentration of deprotonated side species

we introduce the henderson hasselbalch equation

ph = pka + log[proton acceptor]/[proton donor]

inserting values into formula

11 = 10.5 +log[10m]/[x]

we take 10.5 to the left hand side

11-10.5 = log[10m]/[x]

0.5 = log[10m]/[x]

we take the log of both sides

10^0.5 = 10m/x

we cross multiply

x = 10m/10^0.5 = 10^0.5

x = 3.162

approximately 3.16

The solid and the liquid coexist at the melting point, which is the point where the temperature remains constant during the phase transition.

In the given cooling curve, the melting point is at 50°C, indicated by the flat region on the curve between points C and D. At this point, the energy being released during cooling is used to overcome the energy required for the substance to transition from a liquid to a solid state.

Once all of the substance has solidified, the temperature begins to decrease again.

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Answer: all points on the curve between Q and S

Explanation: Where the graph looks like <-------->horizontal.

Answer:

c

Explanation: