How much energy would be needed to raise the temperature of a 5kg block of concrete by 10°C?

The total negative charge on the electrons in 1.32 mol of helium is 7.95 kc.

To find the magnitude of the total negative charge on the electrons in 1.32 mol of helium, we need to know the number of electrons in 1.32 mol. Since helium has an atomic number of 2, it means it has 2 electrons per atom. Therefore, 1.32 mol of helium contains (1.32 mol) * (\(6.022 x 10^2^3\) atoms/mol) * (2 electrons/atom) = \(1.59 x 10^2^4\) electrons.  

Each electron has a charge of \(1.6 x 10^-^1^9\) coulombs.

Multiplying the number of electrons by the charge of each electron, we get

(\(1.59 x 10^2^4\)electrons) * (\(1.6 x 10^-^1^9\) C/electron)

= \(2.54 x 10^5\) coulombs.  

To convert this into kc, we divide by 1000 to get the answer in thousands of coulombs. Therefore, the magnitude of the total negative charge on the electrons in 1.32 mol of helium is \(2.54 x 10^2\) kc, which is equivalent to 7.95 kc.

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Answer:

Alkaline Earth Metals

Explanation:

Scientific advances have helped with the advancement of technologies and to help us solve problems. In the area that these advances have helped positively and negatively is waste production. So the correct option is B.

Waste production occurs as a consequence of any activity in which man is involved, such as residentially, by industry. Some of this waste can be recycled and reused, which makes the process cleaner, but there are some products that remain confined and can cause damage to the environment.

Recycling waste will have benefits such as reducing energy consumption, helping the environment, reducing pollution. But it also has its negative side as it has a high cost and the products, when recycled, will be of low quality.

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Answer:

mixture

Explanation:

if u put sand in to a glass of water it is considered to be a mixture.

Answer:

b

Explanation:

The products are formed when a hydrocarbon combusts are carbon dioxide and water and the correct option is option B.

Combustion is a chemical reaction that occurs when a fuel combines with an oxidizing agent, typically oxygen, resulting in the release of heat and the formation of products. It is an exothermic reaction, meaning it releases energy in the form of heat and light.

During combustion, the fuel undergoes rapid oxidation, breaking its chemical bonds and forming new bonds with oxygen. Common examples of combustion include burning of wood, gasoline, natural gas, and other hydrocarbon fuels.

The reaction is often accompanied by the production of flames and the release of carbon dioxide and water vapor.

Thus, the ideal selection is option B.

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Answer:

this lesson you learned that a chemical symbol is a shorthand way to represent an element and that each element on the periodic table has a unique chemical symbol. Chemical symbols are used to standardize the 'language of chemistry' and to identify elements and atoms in a chemical formula easily.23-Dec-2015

Answer:

ffff

Explanation:

Answer:

2 g/cm

Explanation:

Formula for density:

m/v

to find the volume you can multiply 2 times 2 times 2 (since each side is 2 cm tall)

which is 8cm

16/8cm is 2 g/cm

Hope this helps!

Answer:

a

Explanation:

I hope God it has to be 20 characters so here but I hope this right please have a god day

Answer:

The answer is "B. A conductor that has less conductivity than do metallic conductors."

Explanation:

I took the quiz on A P E X, and I got it right.

The volume, in milliliters, of the krypton gas is 523ml.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

                                    PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Mass = 10g

Pressure = 563 mm Hg

Temperature = 298 K

moles of Kr =mass / atomic mass

= 10 / 84

= 0.119 moles

PV = nRT

563 × V = 0.119 × 8.314 × 298

V = 0.523L = 523ml

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The formation of Na2O through the transfer of electrons is Illustrated.

The atom is made up of subatomic particles such as electrons, protons, and neutrons. The atom is made up of a central nucleus that contains neutrons and protons. The nucleus is surrounded by electrons. Electrons are negatively charged, while proton and neutron are positively charged. An electron is a negatively charged subatomic particle that can be bound to or free from an atom.

Because sodium requires two electrons to complete its octet, it transfers one electron to oxygen. To complete the octet, oxygen requires one more electron. As a result, another sodium atom donates its electron to the oxygen atom. Three ions that attract one another form the overall neutral-charge ionic compound.

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Answer:

9.05 g

Explanation:

PV=nRT

Use the ideal gas equation. Substitute values.

P = 5 atm

V = 1.50 L

n = ?

R (gas constant) = 0.08206 L-atm/mol-K

T = 20.0°C

*Always convert °C to K.

T = 20.0° + 273 = 293K

Substitute values.

(5 atm)(1.50 L) = n(0.08206 L-atm/mol-K)(293K)

n = (5 atm)(1.50 L) / (0.08206 L-atm/mol-K)(293K)

n = 0.3119335... mol

Convert to grams with the given average mass of air.

0.3119335... mol x (29.0 g/1 mol) = 9.05 g

When one substance attracts and combines with another substance to form a uniform solution, the process is called Adsorption. The correct answer is b.

Adsorption refers to the process in which one substance is attracted to and combines with another substance to form a uniform solution. In adsorption, the molecules of the adsorbate (the substance being attracted) adhere to the surface of the adsorbent (the substance attracting). This process occurs through weak intermolecular forces such as van der Waals forces or hydrogen bonding. Adsorption is commonly observed in various fields, such as chemistry, biology, and environmental science, and plays a significant role in processes like chromatography, catalysis, and water treatment. Hence the correct answer is b.

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Answer:

1

False. if they all moved together at any time then it would be a million things withinthe human species all at once at a high rate

Answer:

sulfide is S 2- so it will be M 2+

Answer:

Name                        Oxygen

Atomic Mass                 15.999 atomic mass units

Number of Protons 8

Number of Neutrons 8

Number of Electrons 8

Explanation:

Different rock and mineral ,soil profile

The temperature at which ethanol distill at 1 atm (760 mm hg) would be 350K.

Distillation, also known as classical distillation, is the process of separating the components or substances from a liquid mixture via selective boiling and condensation, often inside a still. Dry distillation is the process of heating solid materials to create gaseous products (which might condense into liquids or solids); this can entail chemical changes such as destructive distillation or cracking.

Distillation can result in either an essentially complete separation (resulting in nearly pure components) or a partial separation that increases the concentration of specific components; in either case, the process takes advantage of differences in the relative volatility of the mixture's components. Distillation is a unit operation of virtually universal relevance in industrial applications, although it is a physical separation process, not a chemical reaction.

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Answer:

Potassium-40 (40K) is a radioactive isotope of potassium which has a long half-life of 1.251×109 years. It makes up 0.012% (120 ppm) of the total amount of potassium found in nature.

...

Potassium-40.

General

Natural abundance 0.0117(1)%

Half-life 1.251(3)×109 y

Parent isotopes Primordial

Decay products 40Ca (β−) 40Ar (EC, γ; β+)

To obtain a more reliable or precise value for the optimum temperature in an experiment, several changes can be made. Here are some suggestions: Replicate the experiment, Increase sample size, Use a narrower temperature range, Utilize more precise temperature control etc

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Answer:

The answer to this question is 2.

Since water does not have charged particles, water is a non-conductor. When some solutes dissolve in water they allow an electric current to flow through the water and the solution conducts electricity. These solutes are called electrolytes. ... Non-electrolytes like sugar dissolve to form molecules in solution.

The new temperature in Kelvin that caused the change is 260 K.

Explanation:

STP (Standard Temperature and Pressure) is defined as 0°C (273.15 K) and 1 atm pressure. Using the combined gas law formula, we can find the new temperature of the gas when it is cooled and the pressure is lowered.

The combined gas law is:

(P1V1)/T1 = (P2V2)/T2

where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.

At STP, the gas has a pressure of 1 atm, volume of 12.2 L, and temperature of 273.15 K.

When the gas is cooled and the pressure is lowered to 0.78 atm, the volume becomes 10.1 L. We can plug these values into the combined gas law formula to solve for the new temperature:

(1 atm x 12.2 L) / 273.15 K = (0.78 atm x 10.1 L) / T2

Solving for T2, we get:

T2 = (0.78 atm x 10.1 L x 273.15 K) / (1 atm x 12.2 L) = 260 K

Therefore, the new temperature of the gas is 260 K.

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:0.19m

Explanation:

Molality (m) of the solution is  = 0.192 mol/kg. Molality (also molal concentration) is represented by symbol m, it measures the number of moles of solute (here a non-electrolyte solute A) present  in 1 kg of solvent. Here, moles of solute can be calculated by dividing given mass of non-electrolyte A with molecular weight of A.

Molecular mass of non-electrolyte A = 60g

Mass of non-electrolyte A = 6g

Volume of solution = 500mL

Density of solution = 1.05g

To calculate molality of solution using formula of molality:

Molality = moles of solute / kilograms of solvent (mol/kg). Here we need to calculate mass of the solvent in kg that is not directly given in the question. Hence, it is required to calculate mass of the solution first and then subtract the mass of solute from it. Also, to calculate the mass of solution, density and volume are given. So, the calculations are done as follows;

Firstly,

To calculate mass of solution using formula of density; D (ρ) = mass/volume. Density (ρ) is the mass of substance divide by it's volume. Therefore, Mass of solution = Density  × volume

Mass of solution = 1.05 × 500

Mass of solution = 525 g

Now, Mass of solvent is calculated as Mass of solute (non-electrolyte A) subtracted from mass of solution. Therefore,

Mass of solvent = 525 - 6 = 519 g (0.519 kg)

Moles of solute are calculated as given weight of solute divided by molecular weight of solute. Hence, moles of solute = 6/60

Moles of solute = 0.1

Molality of solution is calculated as moles of solute divided by mass of solvent or kilograms of solvent (mol/kg)

Molality of solution = 0.1/ 0.519

Molality (m) = 0.192 mol/kg

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Answer:

The answer is lemonade.

Weaker acids are those which tend to have a higher pH from 4 to at least 6 stronger acids have low pH from 2 and below that's from 2 to 0.

Hope this helps

Hope

Answer:C

Explanation: Done by reading and is best answer option.

Explanation:

no of moles = mass / molar mass

mr of Al ( OH)3 = 27+ (16 × 3) + (1 ×3)

= 78

n = 384.3 / 78

n = 4.92692...

n = 4.93

therefore, no of moles = 4.93

Answer:

YES that is the molar mass can be found as the atomic mass of a single atom, BUT when you get to larger molecules your molar mass will be a combination of atomic masses.

Explanation:

The molar mass, number of moles of dipyrithione, and moles of carbon in dipyrithione is 252.31 g/mol, 0.0990, 0.99 respectively

The molar mass of a compound is the sum of the molar mass of the constituent elements present in it.

So the molar mass of dipyrithione is as follows;

M.M=12.0107×10+1.008×8+14.067×2+16×2+32.065×2

M.M=252.31 g/mol

The moles is given by dividing the given mass by molar mass. So we have

n=25/252.31

n=0.0990

Dividing the mass of dipyrithione by its molar mass to get the moles.

The subscript of carbon expresses the moles of carbon per mole of dipyrithione.

Moles of carbon is 10×0.0990=0.99 moles

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