A 135.0-g sample of a metal at 153.0 °C is added to 255.0 g of ethylene glycol (specific heat = 2.43 J/g･ °C) in a calorimeter at 25.7 °C. The temperature of the ethylene glycol rises to 38.2 °C. Calculate the specific heat capacity of the metal, assuming that all the heat lost by the metal is gained by the ethylene glycol.A 135.0-g sample of a metal at 153.0 °C is added to 255.0 g of ethylene glycol (specific heat = 2.43 J/g･ °C) in a calorimeter at 25.7 °C. The temperature of the ethylene glycol rises to 38.2 °C. Calculate the specific heat capacity of the metal, assuming that all the heat lost by the metal is gained by the ethylene glycol.

24.2 g of Argon has 0.6057 moles in it.

We know that the number of moles in a given mass of an element can be calculated by using the formula

⇒ No. of moles = [tex]\frac{Mass of the element }{Molar mass of the element}[/tex]  (i)

Here, the mass of the element Argon = 24.2 grams (ii)

The molar mass of Argon is = 39.948 a.m.u. (iii)

Using the values for the molar mass and mass of the element (ii and iii), we get

⇒ [tex]\frac{24.2}{39.948}[/tex]

⇒ 0.6057 moles present in the given mass of Argon.

Therefore, there are going to be 0.6057 moles in 24.2 g of Argon which is given.

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Explanation:

E=hv

6.626*10power of -34 * 587khz

[tex]-6.66^{0} C[/tex][tex]-30.4^{0} C[/tex]Between the two options, the option A shows the colder temperature, that is [tex]-30^{o}[/tex] F.

Both Fahrenheit and Celsius employ different temperatures as the water's freezing and boiling points, as well as differing sizes for their degrees. While water freezes at zero degrees Celsius and boils at one hundred degrees C, it does so at 32 degrees Fahrenheit and two hundred and twenty degrees F, respectively. You can see that although Fahrenheit has 180 ° between the freezing and boiling extremes, Celsius has 100 degrees. The difference between one degree Celsius and one degree Fahrenheit is 1.8.

On converting [tex]-30^{o}[/tex] F to Celsius we get, [tex]-30.4^{0} C[/tex]

and on converting [tex]20^{o} F[/tex] to Celsius, we get, [tex]-6.66^{0} C[/tex]

Hence, we can say [tex]-30.4^{0} C[/tex] is colder temperature than [tex]-6.66^{0} C[/tex].

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The box for the following fusion equation 2 H + 2 H —> (2H₂) + energy

An critical fusion reaction for practical electricity generation is that between deuterium and tritium (the D-T fusion reaction). It produces helium (He) and a neutron (n) and is written D + T → He + n. To the left of the arrow (earlier than the response) there are  protons and 3 neutrons. The same is genuine on the proper.

Fusion guarantees a without a doubt endless shape of power that, in contrast to fossil fuels, emits 0 greenhouse gases and, not like the nuclear fission electricity used today, produces no lengthy-lifestyles radioactive waste.three.

Calculation:-

2 H + 2 H —> (2H₂) + energy

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The mass of the iron at 100°C is equal to 531.3 grams.

The specific heat capacity can be defined as the quantity of heat required to raise the temperature by one-degree Celcius in one unit of substance.

The energy is lost or absorbed will change the temperature of the substance, which can be shown as:

Q = mCΔT

Given, the initial temperature of the iron = 100°C

The initial temperature of water = 25 °C

The final temperature of both iron and water = 65°C

The specific heat capacity of the iron, C = 0.450 J/g°C

Water's specific heat capacity, C = 4.184 J/g°C

Heat lost by Iron (Fe) = Heat absorbed by water

- m × (0.450 J/g°C) × (65 - 100)°C =  50 × (4.184 J/g°C) × (65 - 25)°C

15.75 m = 8368

m = 531.3 g

Therefore, the mass of the iron is 531.3 grams.

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The equilibrium constant expression for the given reaction of methane with hydrogen sulfide will be:

[tex]k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]

Equilibrium constant expression is a ratio of the concentration of products to that of the concentration of the reactants. It is given by k[tex]_c[/tex].

In the given reaction, the product of the concentration of the reactants is

[tex]k_r[/tex] = [tex][CH_4] [H_2S]^2[/tex]

while the product of the concentration of the products is

[tex]k_p[/tex] = [tex][CS_2][/tex] [tex][H_2]^4[/tex]

According to the definition,

[tex]k_c = \frac{k_p}{k_r}[/tex]

[tex]\therefore k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]

Thus, the equilibrium constant expression is the ratio of the concentration of products and reactants.

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Answer:

A

Explanation:

Independent variable: the surface of the slope rug, bubble wrap and wood

For this experiment, various solutions were compared to look for precipitation or bubbling. The precipitates or bubbles are the independent variable in the experiment. Therefore, option B is correct.

The term precipitation is defined as a solid produced by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid.

A substance separated from a solution or suspension by chemical or physical change, usually as an insoluble amorphous or crystalline solid.

A compound may precipitate when its concentration exceeds its solubility. This can be caused by temperature changes, solvent evaporation, or solvent mixing. A strongly supersaturated solution precipitates more quickly.

Independent variable are the surface of the slope rug, bubble wrap and wood.

Thus, option B is correct.

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The temperature of the silver will decrease by -828.7 °C

if it loses 982 J of heat energy

From calorimetry, we understood that heat released or lost is given by:

Q = MCΔT

Where

With the above formula, we can determine the temperature change of the silver. This is illustrated below

Q = MCΔT

-982 = 5 × 0.237 × ΔT

-982 = 1.185 × ΔT

Divide both side by 1.185

ΔT = -982 / 1.185

ΔT = -828.7 °C

Thus, the temperature will decrease by -828.7 °C

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

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 chlorine gas =1 atm

V= volume of chlorine gas =18.5L

n =number of moles of chlorine gas

T =temperature of chlorine gas =298K

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

1 atm×18.5L= 0.0821×n×298K

1 atm×18.5L=n×24.4

n=0.75mol

mass of chlorine=0.75mol×35.453 g/mol

                          =26.55g

Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

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Answer:

A.) 14.75 mol

Explanation:

To find the amount of moles, you need to use the Ideal Gas Law equation:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = number of moles

-----> R = Ideal Gas Constant (0.08206 L*atm/K*mol)

-----> T = temperature (K)

You can plug the given values and the constant into the equation and simplify to find "n".

P = 10 atm                    R = 0.08206 L*atm/K*mol

V = 27 L                       T = 223 K

n = ? moles

PV = nRT                                                                   <----- Ideal Gas Law

(10 atm)(27 L) = n(0.08206 L*atm/K*mol)(223 K)   <----- Insert variables

270 atm*L = n(18.299 L*atm/mol)                           <----- Mutliply

14.75 mol = n                                               <----- Divide both sides by 18.299

In a case whereby A bath bomb is a solid sphere made of a weak base and a weak acid and you add it to a bathtub, it mixes with the water to create a soapy solution. If you want it to completely and quickly dissolve a large bath bomb, then  C. Increase the water temperature, which increases the solubility of the bath bomb - dissolving it more quickly.

Solubility can be described as the maximum amount of a substance  which candissolve when subjected to given amount of solvent at a specified temperature.

It should be noted that the Solubility i serves as the characteristic property  that can be associated to a specific solute–solvent combination and there is a differing solubilities, hence from the case aboive when the tempertaure is been increased , this will  increases the solubility of the bath bomb .

Therefore, option C is correct.

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Since carbohydrates are essential biomolecules the action of sugars fluctuates when enzymes consume substrates of glucose molecules.

Gas pressure is the pressure created by the collision of gas particles with an object. Inside the balloon, gas particles collide with the inner wall of the balloon. It's these collisions that keep the balloon inflated. When carbon dioxide gas fills the balloon, it inflates. The more gas produced, the bigger the balloon will inflate.

The chemical reaction between baking soda and vinegar will inflate the balloon as long as the baking soda and vinegar react. Force Balance: The pressure inside the inflated balloon is greater than the pressure outside. The balloon is stable because the expansion force due to the pressure difference balances the contraction force due to the surface tension of the rubber.

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Following are reactant and product states and the  balanced chemical equation for the specified chemical reaction: NaOH(aq)+HCl(aq) → NaCl(aq)+H2O(l)

How do you balance a chemical equation?

Step 1: In both reactants and products, count each kind of atom.

Check whether there is exactly the same amounts of each atom on either side of the arrow. Otherwise, the equation is unbalanced, and you must move on to step 2.

Step 2: To increase the amount of atoms or molecules in the substances, place coefficients in front of the symbols or formulas as necessary. Make use of the fewest coefficients you can.  Chemical formulations should never have their subscripts changed. The substances involved in the reaction can be altered by changing subscripts. Only modify the coefficients.

Till the equation is balanced, go back and repeat steps 1 and 2.

Following are reactant and product states and the  balanced chemical equation for the specified chemical reaction:

In the reaction between sodium hydroxide and hydrogen chloride, sodium chloride and water are produced.

Hence,

NaOH(aq)+HCl(aq) → NaCl(aq)+H2O(l)

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Natural abundance indicates the following percentage of the natural occurrence of an isotope of an element on the planet.

Natural abundance is defined as the relative amount of the isotopes of an element which occurs in nature. It is also known as geonormal abundance.

The formula to calculate the natural abundance of an element with two isotopes is given as :

x + (1 - x) = 1

Where,

x represents the fractional value of isotope-1 and 1 - x represents the fractional value of isotope-2.

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Answer:

Heterotrophs

Explanation:

Heterotrophs are known as consumers because they consume producers or other consumers. Dogs, birds, fish, and humans are examples of heterotrophs. Heterotrophs occupy the second and third levels of the food chain, the chains of organisms that provide energy and nutrients to other organisms.

The mass in grams of sulfuric acid, H₂SO₄, that will be produced by the complete reaction of 40.01 grams of sulfur trioxide is 49.01 grams

We'll begin by obtaining the reacting mass from the balanced equation. This is shown below

SO₃(g) + H₂O(l) → H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Finally, we shall determine the mass of sulfuric acid, H₂SO₄ produced as illustrated below:

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Therefore,

40.01 g of SO₃ will react to produce = (40.01 × 98) / 80 = 49.01 g of H₂SO₄

Thus, the mass of sulfuric acid, H₂SO₄ produced is 49.01 g

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The given reaction is an exothermic reaction thus, heat is evolved in the reaction. Thus increasing temperature increases the rate of reverse or backward reaction. Increasing concentration of ozone and O will increase the rate of forward reaction.

According to collision theory, the rate of a reaction depends on the number of effective collisions of the reactants. The given reaction is the combination of ozone with oxygen to give oxygen molecule.

This reaction is exothermic, hence increasing the temperature will effect the equilibrium so as to consume the extra temperature reverse reaction will take place by which collision of O₂ molecules increases.

Similarly increasing the concentration of reactants O₃ and O will increase the rate of forward reaction. The enthalpy change is negative here indicating the reaction is exothermic, thus, increase the temperature and use of catalyst also decreases the activation energy ΔE.

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The result of the Heat Transfer experiment is given as follows:  "The molecule was increased in kinetic energy but in a random structure." (Option B)

Heat transfer is a thermal engineering subject that deals with the creation, consumption, conversion, and exchange of thermal energy across physical systems.

Heat transmission is categorized into several methods, including thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.

At 3 p.m., the water temperature is raised. The average kinetic energy of an item is related to its temperature. As a result, as temperature rises, so does average kinetic energy.

Kinetic energy is created by the random movement of molecules. Hence, the correct answer is "The molecule was increased in kinetic energy but in a random structure."

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Full Question:

A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at  20.50C. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m.  The data from the investigation are shown in the table below.

[See attached image]

Question:How would you describe the average kinetic energy of the water molecules in the bottle at 7 a.m. to  the average kinetic energy of the water molecules in the bottle at 3 p.m.

One kilopascal of pressure is 0.01 bar pressure. Thus 494 kilopascal pressure is 4.94 bar pressure.

Pressure is an intensive quantity measuring the force produced on body by a mechanical stress. Pressure of a substances is inversely proportional to the volume and directly proportional to the temperature.

Pressure of a substance can be expressed in different units where, the SI unit is atm or atmospheric pressure. Other units are bar, pascal, kilopascal etc.

One kilopascal pressure = 0.01 bar. Hence, 494 kilopascal is:

(494 Kpa × 0.01 bar) / 1 kpa = 4.94 bar.

Hence, 494 Kpa pressure is 4.94 bar.

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Answer:

13.89

Explanation:

13.89 moles (mole =mass)

Answer:

1s2 2s2 2p4

Explanation:

The difference between the molecules that have dipole forces and those that have London forces is that the molecules that have dipole forces are polar while those that have London forces are not.

We know that dipole forces are one of the kinds of intermolecular forces that exist. Let us note that a molecule is composed of the primary bond forces that hold the atoms of the molecule together and then the secondary bond forces that do hold the molecules together.

Now, the kind of interactions that exists between the molecules is the reason for the properties of the compound that we see. The molecules have not been shown here but I would discuss the properties of the London forces and the dipole forces.

Note that the molecules that do have the dipole forces have an electronegativity difference between the atoms of the molecule. The molecules that have the London forces are largely non polar.

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Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The correct option is option A.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Out of given compound, a polymer of ethene that is polyethylene will have highest molar mass. Polymer is a long chain of same or different monomer unit. Polymer has higher mass than the individual compound.

Therefore, option A is correct.

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Answer: polyethylene, a polymer of ethene

For any component: Proton count equals atomic number

Number of protons plus number of electrons equals the atomic number.

The number of neutrons is equal to the atomic number-mass number.

The quantity of protons in an element's atom is known as the atomic number. The atomic number of krypton in our illustration is 36. This indicates that the nucleus of a ruthenium atom contains 36 protons.

Every atom of ruthenium has 44 protons, which is intriguing. A Ruthenium atom cannot exist if it does not have 44 protons. A distinct element is produced by changing the number of protons in an atom's nucleus. An atom of rhodium is produced, for instance, by taking one proton away from a krypton atom.

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Answer:  They speed up and move farther apart.

Explanation:  With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates. The volume increases as they start moving apart from each other.

Any object which have less density than the mercury will float in it and which have higher density will sink on it. Here, gold has higher density than  mercury. Thus it will sink on mercury.

Density of a substance is the measure of its mass per volume. Thus it says about how much denser the substance is in a specific volume. The ratio of density of an object to the density of  water is called specific gravity.

The density of mercury is 13.4 g/ml. Any object which is less dense than mercury will float on its surface whereas, objects which have higher density than mercury will sink on it.

The density of gold is 79.3 g/ml. All other given metals iron, lead and copper have a density less than that of mercury. Hence the substance which sink on mercury is gold. Option Dis correct.

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Atom consists of electron, proton and neutron.  The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Mass number =Number of neutrons+ number of protons

Mass number =55

Number of neutrons=atomic number+5

Substituting the given values in the above formula

55 =atomic number+5+ number of protons

50=2×atomic number

Atomic number=25

Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

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Answer:

0.5 7.0 there is so many results

Explanation:

its very simple

Answer:

c. a reaction in which oxidation numbers change

Explanation:

In an oxidation reaction there is loss of electrons whereas in a reduction reaction there is gain of electrons. Therefore, a reaction in which oxidation numbers change identifies an oxidation-reduction reaction.

Answer:

C: a reaction in which oxidation numbers change.

Explanation:

Answer:

the number of protons in the nucleus of an atom. the number of protons define the identity of an element