What is the total number of calories
of heat that must be absorbed to
change the temperature of
100 grams of H20 from 25°C to
30°C? (specific heat for H20 = 1
cal/g)
A 100
B 500
C 2,500
D 3,000

Answer:

A well balanced chemical equation should have fulfilled coefficient, formula and chemical state aspects.

Explanation:

Balancing of chemical equations requires ensuring an equal number of atoms for each element on both sides of an equation, using integer coefficients, representing reactions involving ions with ionic equations, and maintaining the same sum of charges between reactants and products.

The balancing of chemical equations is governed by four basic rules derived from the law of conservation of matter:

These fundamentals assist in understanding reaction stoichiometry and writing balanced chemical equations for different types of reactions including precipitation, acid-base, and oxidation-reduction (redox) reactions.

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Answer:

The statement is False.

Explanation:

Endothermic reactions absorbs heat and make surrounding temperature low. The reaction which produces heat and make surroundings warm is called the exothermic reaction. Exothermic reactions produce heat. In Endothermic reactions, molecular bonds gets broken and new molecular bonds may possibly form. So energy is needed to be stored in these bonds, so through endothermic reactions, surrounding energy is absorbed in the bonds and the temperature of the surroundings drops.

Answer:

False

Explanation:

endothermic reactions do not produce heat, they only absorb heat from the surrounding. Exothermic reactions produce heat.

A sphere is perfectly symmetrical and it is not a polyhedron. A sphere has a constant width and circumference. The volume of the sphere with a diameter of 4cm is  33.40 cm³. The correct option is B.

The amount of space occupied by the three dimensional object is defined as the volume of the sphere. A sphere is defined by three axes namely x-axis, y-axis and z-axis. It has no flat face but a curved face.

The equation used to calculate the volume of sphere is:

Volume = 4/3 πr³

Diameter = 4cm

radius = 2cm

Then the volume is:

Volume = 4/3 × 3.14 × (2)³

Volume = 33.40 cm³

Thus the correct option is B.

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Your question is incomplete most probably your full question was:

The diameter of a sphere is 4 centimeters. Which represents the volume of the sphere?

A. 321 cm³

B. 33.40 cm³

C. 541 cm³

D. 167 cm³

Answer:

A horizon, B horizon, C horizon .

Answer:

The A horizon, the B horizon, and the C horizon respectively.

We must balance the substance. O is -2 so Al must be +2 such as that x - 2 = 0 and therefore x = 2.

The charge of each aluminium ion must be +2.

Hope this helps.

The balanced equation for the reaction between pentane (C₅H₁₂) and oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O) is:

The equation for the reaction between pentane and oxygen to produce carbon dioxide and water can be written as follow:

Pentane => C₅H₁₂

Oxygen => O₂

Carbon dioxide => CO₂  

Water => H₂O

Pentane + Oxygen —> Carbon dioxide + Water

C₅H₁₂ + O₂ —> CO₂ + H₂O

The above equation can be balance as follow:

C₅H₁₂ + O₂ —> CO₂ + H₂O

There are 5 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 5 before CO₂ as shown below:

C₅H₁₂ + O₂ —> 5CO₂ + H₂O

There are 12 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 6 before H₂O as shown below:

C₅H₁₂ + O₂ —> 5CO₂ + 6H₂O

There are 2 atoms of O on the left side and a total of 16 atoms on the right side. It can be balance by writing 8 before O₂ as shown below:

C₅H₁₂ + 8O₂ —> 5CO₂ + 6H₂O

Now, the equation is balanced.

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Answer:

the answer is C

Explanation:

edge 2023

Final answer:

When the air inside a milk carton warms up, air molecules move faster, leading to increased pressure which could cause the carton to expand or burst. Higher temperatures also accelerate the spoilage process of the milk, making it sour quicker.

Explanation:

If the air in a carton of milk is allowed to warm up, the kinetic energy of the molecules in the air would increase. This means that the air molecules would move faster and collide with more force. As per the kinetic-molecular theory, when the temperature of a gas increases, the molecules gain more energy and their motion (kinetic energy) increases, which in turn causes an increase in pressure if the gas is confined in a container like a milk carton.

This increase in pressure could lead to the carton expanding or even bursting if it does not have an appropriate way to vent the increased pressure. Additionally, in the context of the milk itself, a higher temperature would accelerate the spoilage process. Bacteria that cause milk to spoil reproduce more quickly at higher temperatures, leading to the milk souring in a shorter amount of time.

Answer:

3Mg + Fe₂O₃ → 3MgO + 2Fe.

Explanation:

3Mg + Fe₂O₃ → 3MgO + 2Fe.

That 3.0 mole of Mg react with 1.0 mole of Fe₂O₃ to produce 3.0 moles of MgO and 2.0 moles of Fe.

Mg (3), Fe (2), and O (3).

Answer:

36290 min = 604.8 hr.

Explanation:

1 lbs = 453.59237 grams.

∴ 2 lbs = 907.18474 grams.

Using cross multiplication:

500 mg of iron oxide dissolved → 20 minutes.

907184.74 mg of iron oxide dissolved → ??? minutes.

∴ The time needed to dissolve 2 lbs of iron oxide = (907184.74 mg)(20 min)/(500 mg) = 36290 min = 604.8 hr.

Answer:

To determine a molecular formula from the empirical formula you need to know:

-the molecular mass

-calculate the empirical formula mass

-divide the molecular formular by the empirical formula mass

-multiply by this whole number the empirical formula

Explanation:

See the image below

A 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7, due to the logarithmic nature of pH levels.

When comparing the hydronium ion concentration between two aqueous solutions with different pH levels, it is important to understand the logarithmic scale of pH. A pH of 7 is considered neutral, and at this pH, the concentration of hydronium ions is 1.0 × 10-7 M. A solution with a pH of 5 would have a hydronium ion concentration of 1.0 × 10-5 M, which is a factor of 102 or 100 times more hydronium ions than a neutral solution of pH 7. Therefore, a 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7.

A 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7. The pH scale is logarithmic, meaning that each unit represents a tenfold difference in concentration. So, a pH difference of 2 between two solutions corresponds to a 100-fold difference in hydronium ion concentrations. Since pH 5 is two units lower than pH 7, the concentration of hydronium ions in the solution with a pH of 5.0 is 100 times greater than the solution with a pH of 7.0.

Answer:

5.13 kg/l

Explanation:

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Answer:

5.13 kg/L

Explanation:

The units for density are mass divided by volume. This means that for an expression to be a measurement of density it would need to have an unit of mass in the numerator, and an unit of volume in the denominator.

With that in mind, kg is a unit of mass, and L is a unit of volume, so any positive number followed by "kg / L" is a measurement of density.

Answer:

hafnium: atomic number 72

Phosphorus :Atomic number 15

Rhodium :Atomic number 45

Osmium: atomic number = 76

Magnesium: atomic number = 12

Answer:

The right choice is → alkane

Explanation:

Alkane, alkene , alkyne, and aldehyde all are organic compounds with different formula.

Alkane has  a general formula : CₙH₂ₙ₊₂

Alkene has  a general formula : CₙH₂ₙ

Alkyne has  a general formula : CₙH₂ₙ₋₂

while, Aldehyde has a -CHO functional group.

in the given example Butane C₄H₁₀ it has the general formula C₄H₂.₍₄₎₊₂

So, the right choice is: → alkane

Answer:

38.36 L.

Explanation:

where, P is the pressure of H₂ in atm (P = 1.0 atm, STP conditions).

V is the volume of H₂ in L (V = ??? L).

n is the no. of moles of H₂ in mol (n = mass/molar mass = (10.0 g)/(2.0 g/mol) = 5.0 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of H₂ in K (T = 0.0°C + 273 = 273.0 K, STP conditions).

∴ V = nRT/P = (5.0 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 38.36 L.

Answer:

14,938 tablets.

Explanation:

WE divide:

1.21 kg / 81 mg

1.21 kg = 1,210 g = 1.210,000 mg.

So it is 1,210,000 / 81

= 14,938 tablets.

14,938 tablets of 81mg aspirin tablets can be made from 1.21 kg of aspirin​

It is a medication used to reduce pain, fever, or inflammation.

Calculation for doses:

[tex]\frac{1.21 kg}{81 mg}\\\\1.21 kg = 1,210 g = 1.210,000 mg[/tex]

Thus,

[tex]\text{Number of tablets} =\frac{1,210,000mg}{81mg} \\\\= 14,938 \text{ tablets}[/tex]

Thus, number of tablets are 14,938.

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Answer:

[tex]\boxed{\text{Replacing the cube of manganese(IV) oxide with its powder}}[/tex]

Explanation:

The MnO₂ is acting as a catalyst: it takes part in the reaction but can be recovered at the end.

A. Using a 2 g cube of MnO₂

The surface area of the catalyst would double, so the rate would probably double. Technically, this option is correct, but I don't think it is the one the questioner intended.

B. Using 50 cm³ of H₂O₂

No effect. The rate depends on how fast the H₂O₂ molecules can reach the surface of the catalyst, and the surface area hasn't changed.

C. Using powdered MnO₂

This would increase the rate enormously, because the powdered catalyst has a much greater surface.

D. Removing MnO₂

The rate would decrease to near-zero, because there is no catalyst.

Replacing the cube of manganese (IV) oxide with its powder is likely to increase the rate of product formation in the reaction between manganese (IV) oxide and hydrogen peroxide, due to increased surface area and more active sites for the reaction. Option C is correct.

When 1 g of a cube of manganese (IV) oxide was added to 100 cm³ of hydrogen peroxide to produce water and oxygen, with manganese oxide acting as a catalyst and not being consumed, certain changes can increase the rate of product formation.

Among the provided options, replacing the cube of manganese (IV) oxide with its powder will likely increase the rate of formation of the products most effectively. This is because increasing the surface area of the catalyst, in this case by using powdered manganese oxide instead of a cube, provides more active sites for the reaction, thus facilitating a higher rate of chemical reaction.

On the contrary, using more manganese oxide beyond what is needed as a catalyst does not increase the rate of reaction because a catalyst is not consumed in the reaction. Reducing the volume of hydrogen peroxide or removing the catalyst will not increase the reaction rate but may have the opposite effect.

Hence, C. is the correct option.

The complete question is:

content loaded

When 1 g of a cube of manganese (IV) oxide was added to 100 cm³ of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction. Based on this information, which of the following is likely to increase the rate formation of the products?

A. Using 2 grams of manganese oxide

B. Using 50 cm³ of hydrogen peroxide

C. Replacing the cube of manganese (IV) oxide with its powder

D. Removing manganese (IV) oxide from the reaction mixture

Considering the definition of pH, the pH of an acid solution containing 0.10 M HNO₃ is 1.  

You need to know that pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

On the other side, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid equals the concentration of hydrogen ions.

In this case, HNO₃ is a strong acid, so:

[HNO₃]= [H⁺]= 0.10 M

So the pH can be calculated as:

pH= - log (0.10 M)

Solving:

pH= 1

Finally, the pH of an acid solution containing 0.10 M HNO₃ is 1.

Learn more:

The pH of a solution can be calculated using the formula pH = -log [H3O+]. In this case, the pH of a 0.10 M HNO3 acid solution would be 1.0 because HNO3 completely dissociates in water, and the hydronium ion concentration is 0.10 M.

This problem pertains to the field of acids and bases, specifically dealing with the concept of pH. The pH of a solution can be calculated using the formula pH = -log [H3O+], where [H3O+] stands for the hydronium ion concentration. Bear in mind that for a strong monoprotic acid such as HNO3, the concentration of this acid equals the concentration of hydronium ions due to its complete dissociation in water.

In this case, [H3O+] equals 0.10 M, the same as the concentration of HNO3. Now, substituting this into the pH formula gives us pH = -log(0.10), which simplifies to a pH of 1. This means the pH of a 0.1M HNO3 solution would be 1.0.

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Answer:

MgCl₂ and H₂

Explanation:

The reaction between Magnesium and Hydrochloric acid is a single replacement reaction. In a single replacement, a metallic ion replaces another ion based on their positions in the activity series.

The reaction can be written as:

              Mg + HCl → ?

The ionic form can be written as:

             Mg + H⁺ + Cl⁻ → ?

Now lets look at the reaction halves:

            Mg → Mg²⁺ + 2e⁻        This is an oxidation half in which 2e⁻ is lost

           2H⁺ + 2e⁻ → H₂         This is a reduction half in which 2e⁻ is gained

In the activity series, Mg is higher up and is able to replace the hydrogen ions that in the lower part of the series.

Combining both reaction halves, we have:

               Mg + 2H⁺ → Mg²⁺ + H₂

If we include the spectator ions we have:

             Mg + 2HCl → MgCl₂ + H₂

Answer:

1fertilize

2. gene

3. uterus

4. conception

5.chromosomes

6. deoxyribonucleic acid

7. zygote

Answer:

1. To unite a male reproductive cell with a female reproductive cell ---Fertilize

2. A new cell formed from two cells at fertilization --- Zygote

3. A special, muscular organ inside a mother that protects a developing embryo --- Uterus

4. The fertilization of female egg cell with a male sperm cell --- Conception

5. Strings of DNA in cell nuclei --- Chromosomes

6. The genetic material that determines the nature of life forms --- Deoxyribonucleic acid

7. The code for a particular characteristic of a living organism --- Gene

Explanation:

1- Fertilization is the process by which two gametes fuse during sexual reproduction to create a new individual with a genome derived from both parents.

2- In biology, the cell resulting from the union of the male gamete with the female gamete in the sexual reproduction of organisms is called zygote.

3- The uterus is the organ of gestation and the largest organ of the female reproductive system of most mammals, including humans. It is a muscular, hollow, pear-shaped, infraperitoneal organ located in the lower pelvis of the woman who, when adopting the position in anteversion, leans on the urinary bladder in front, with the rectum behind. It lodges the blastula, that is implanted in the endometrium, giving beginning to the gestation.

4- The term conception refers to the action and effect of conceiving. In biology, it is the fusion of two sex cells to give rise to the zygote cell, where the union of the chromosomes of male and female is found.

5- In biology and cytogenetics, it is called chromosome to each of the highly organized structures, consisting of DNA and proteins, which contains most of the genetic information of a living being.

6- Deoxyribonucleic acid, abbreviated as DNA, is a nucleic acid that contains the genetic instructions used in the development and functioning of all living organisms and some viruses; He is also responsible for the hereditary transmission.

7- A gene is an information unit in a deoxyribonucleic acid locus that encodes a functional product, such as proteins. It is the molecular unit of genetic inheritance, because it stores genetic information and allows it to be transmitted to offspring.

the only process out of the four that does not happen in both animals implants would be photosynthesis. photosynthesis is when the cell takes the energy from the Sun's UV rays and turns into a form of energy that it can use

Answer: Photosynthesis.

Explanation: Photosynthesis can be defined as the process by which autotrophs synthesize food( glucose) from the carbon dioxide and water in the presence of sunlight.

The food that is produced by plants is used by plants for various types of the metabolic processes that takes place in the plant body.

This process only takes place in plants and it does not occurs in animals.Rest processes like cellular respiration, consumption of glucose and metabolic reaction takes place in both the plant and animal cell.

The entropy of a system decreases when a gas condenses into a liquid, which corresponds to option B. a gas condensing. This reflects the second law of thermodynamics where the total entropy of the universe still increases while local decreases are possible with energy transfer.

Entropy is a measure of disorder or randomness in a system, and it is an important concept in thermodynamics. In the question presented, the process in which entropy decreases is the condensation of gas into a liquid or solid. Therefore, the correct answer to which system sees a decrease in entropy is B. a gas condensing.

For example, when water vapor condenses on a cold surface, it goes from a disorderly gas phase to a more ordered liquid phase, which means that its entropy decreases. Energy transfer is necessary for the entropy of a system to decrease. This is consistent with the Second Law of Thermodynamics, which states that for the entropy of a system to decrease, the entropy of the surroundings must increase by a greater amount, thus the total entropy of the universe still increases.

Answer:

On the other hand, the molecules in liquid water are held together by relatively strong hydrogen bonds, and its enthalpy of vaporization, 40.65 kJ/mol, is more than five times the energy required to heat the same quantity of water from 0 °C to 100 °C

Answer: The energy required to vaporize the given amount of water is 22600 J

Explanation:

The conversion involved in this process are:

[tex]H_2O(l)(100^oC)\rightarrow H_2O(l)(100^oC)[/tex]

To calculate the amount of heat required at constant temperature, we use the equation:

[tex]q=m\times L_{vap}[/tex]

where,

[tex]q[/tex] = amount of heat absorbed = ?

m = mass of water = 10 g

[tex]L_{vap}[/tex] = latent heat of vaporization = 2260 J/g

Putting all the values in above equation, we get:

[tex]q=10g\times 2260J/g=22600J[/tex]

Hence, the energy required to vaporize the given amount of water is 22600 J

Answer: When a pendulum is at the bottom of its swing, it has kinetic energy.

Explanation: At the bottom of a swing, the greatest speed is achieved. Speed/Velocity equals Kinetic Energy, as potential energy is when speed is at its lowest.

A Proton has a Positive Charge

A single proton has one unit of positive charge. For a neutral atom the number of electrons and protons is equal and the charges gets canceled each other.

The basic unit every substance in the universe is called an atom like the cell in an organism. An atom is made of sub atomic particles protons, electrons and neutrons.

Neutrons are neutral and protons are positively charged particles. Electrons are negatively charged particles and they are revolving around the nucleus through circular trajectories of fixed energies.

The number of protons and electrons in an atom is same and that make an atom neutral in ground state. The positive charges of protons is canceled by equal number of negative charges.

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Hello There!

Conduction is the transfer of heat from one particle of matter to another.

“I Have 3 Examples Of Convection Provided Below”

“A Pot Sitting On A Hot Burner”

“Picking Up A Hot Cup Of Coffee”

“Feet On Hot Sand”

Answer:

The hot tea should transfer 25.63 kJ the surroundings to cool the tea.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat has to be transferred from the tea to the surroundings to cool the tea (Q = ??? J).

m is the mass of the hot tea (m = dV = (1.0 g/mL)(250 mL) = 250 g), suppose the density of water is the density of tea.

c is the specific heat of the hot tea (c = 4.10 J/°C.g).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 350 K - 375 K = -25°C).

∴ Q = m.c.ΔT = (250 g)(4.10 J/°C.g)(-25°C)) = - 25630 J = - 25.63 kJ.

So, the hot tea should transfer 25.63 kJ the surroundings to cool the tea.

Answer:

2.04 x 10²⁴ molecules

Explanation:

Given parameters:

Mass of Be(OH)₂ = 145.5g

To calculate the number of molecules in this mass of Be(OH)₂ we follow the following steps:

>> Calculate the number of moles first using the formula below:

Number of moles = mass/molarmass

Since we have been given the mass, let us derive the molar mass of Be(OH)₂

Atomic mass of Be = 9g

O = 16g

H = 1g

Molar Mass = 9 + 2(16 + 1)

= 9 + 34

= 43g/mol

Number of moles = 145.5/43 = 3.38mol

>>> We know that a mole is the amount of substance that contains Avogadro’s number of particles. The particles can be atoms, molecules, particles etc. Therefore we use the expression below to determine the number of molecules in 3.38mol of Be(OH)₂:

Number of

molecules= number of moles x 6.02 x 10²³

Number of molecules= 3.38 x 6.02 x 10²³

= 20.37 x 10²³ molecules

= 2.04 x 10²⁴ molecules

a. SiO2 is inorganic

b. CsH4Cl2 and c. CsH202(OH)3 are organic

Got no idea for d. Caci