Why does the light bulb in a circuit turn on when the switch is closed?

Answer:

Good morning!!!

Explanation:

Catalysts are correctly characterized by each of the following statements except one. Catalysts are characterized by being able to exist in various states (solids, liquids, or gases),
The correct answer is (e) no correct response.

All of the statements are correct and accurately describe catalysts.
(a) Catalysts can exist in any state, whether they are solids, liquids or gases.
(b) One of the primary functions of a catalyst is to lower the activation energy required for a reaction to occur. This allows the reaction to proceed more quickly and efficiently.
(c) Catalysts do not participate in the reaction itself, but rather facilitate it.
(d) Catalysts are not consumed during a reaction and can be reused multiple times.

Catalysts are characterized by being able to exist in various states (solids, liquids, or gases), lowering the activation energy for a reaction, and not being consumed in a reaction. However, they do actively participate in a reaction by providing an alternative reaction pathway and forming temporary intermediate compounds, which ultimately helps increase the reaction rate.

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Answer:

The biodiversity of an area is literally the number of species, both plant and animal, inhabiting the environment being examined.  When a species is no longer found in a region, it is locally extinct.

Explanation:

The reason for the changes in mass D. Procedure 1: One of the products was a gas that escaped into the air. Procedure 2: A gas from the air reacted with one of the other reactants.

From the table given, it can be seen that the mass of the reactants for procedure 1 and procedure 2 were both 100.0g. This changed for the mass of products. While procedure 1 had 97.5g, procedure 2 had 102.5g.

In this case, for Procedure 1, one of the products was a gas that escaped into the air and this led to the reduction in mass. For Procedure 2, gas from the air reacted with one of the other reactants and this increased the mass.

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Answer:

The number of protons, massive, positively charged nuclear particles defines the identity of the nucleus.

Woah. Vocabulary here.

An isotope is any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weight. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties.

Helium is usually defined as an inert, gaseous element present in the sun's atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; atomic weight: 4.0026; atomic number: 2; density: 0.1785 g/l at 0 °C and 760 mm pressure.

Explanation:

The number of protons, massive, positively charged nuclear particles, gives Z, the atomic number, which defines the identity of the nucleus.

Z=1, "hydrogen",Z=2, "helium",Z=3, "lithium",...........Z=21, "scandium".

The nucleus may contain various numbers of neutrons, massive, neutrally charged nuclear particles, which gives to the existence of isotopes.

For hydrogen, \(Z=1\) by defintion. That is there is a proton in all hydrogen nuclei. Some hydrogen nuclei contain 1 neutron to give the deuterium isotope, \(^2H\) ; an even smaller number of hydrogen nuclei contain 2 neutrons, to give the tritium isotope, \(^3H\) ; Most atoms have a number of isotopes in different proportions.

To answer your question, the helium atom has \(Z=2\) ; i.e. there are 2 nuclear protons, which is what defines the atom as helium. The most common isotope of helium is \(^4He.^3He\) and \(^5He\) re known with vanishingly small abundances, and half lives.

This video discusses how to determine the number of subatomic particles in C-12 , C-14 , H-1 , H-2 and H-3 .

Thanks.

Takealot excels at providing convenience, extensive product selection, competitive pricing, and a seamless online shopping experience as its value proposition for consumers.

Convenience is a key aspect of Takealot's value proposition. As an online retailer, Takealot offers the convenience of 24/7 shopping from the comfort of one's own home.

Customers can browse a wide range of products, place orders, and have them delivered directly to their doorstep.

Takealot also offers an extensive product selection, spanning various categories such as electronics, fashion, home goods, and more.

This breadth of choices allows consumers to find and compare different products all in one place, saving them time and effort compared to traditional retailers with limited inventory.

Competitive pricing is another area where Takealot excels. By operating online, the company has lower overhead costs compared to brick-and-mortar retailers, enabling them to offer competitive prices and discounts to their customers.

The seamless online shopping experience provided by Takealot includes user-friendly interfaces, secure payment options, and efficient delivery services. This enhances customer satisfaction and convenience.

In contrast, traditional non-online retailers typically have limited operating hours, smaller product selections, and may not offer the same level of convenience and competitive pricing.

They often require customers to physically visit their stores, which can be time-consuming and may not provide the same level of ease and accessibility as online platforms like Takealot.

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Answer:

Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material. Filtration separates solids of different sizes.

Explanation:

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Answer:

0.064 moles

Explanation:

First, we need to convert the temperature in Kelvin, which can be done by adding 273 to the temperature in Celsius. So the temperature in Kelvin is 294 K. We can now use the Ideal Gas Law, PV = nRT, to solve for the number of moles, n. Rearranging the equation gives us n = PV/RT. Plugging in our values gives us n = (0.553 atm)(1.90 L)/[(0.0821 L·atm/K·mol)(294 K)] = 0.064 mol. Therefore, there are 0.064 moles of krypton gas present in the container.

Answer: B

Explanation:

That ΔHvap is 54.5 kJ/mol, and the boiling point is 83.4°C, 1 atm, if one mole of this substance is vaporized at 1 atm, the correct option is D. 153 J/K mol.

Given that ΔHvap is 54.5 kJ/mol, and the boiling point is 83.4°C, 1 atm, if one mole of this substance is vaporized at 1 atm, calculate ΔS.The ΔS can be calculated using the following equation;ΔS = ΔHvap / Twhere ΔHvap is enthalpy of vaporization and T is the temperature.Since boiling point is 83.4°C, we need to convert it to kelvin by adding 273.15 to it.T = 83.4 + 273.15 = 356.55 KΔS = 54.5 kJ/mol / 356.55 K= 153 J/K mol. Therefore, the correct option is D. 153 J/K mol.Given that the enthalpy of vaporization (ΔHvap) is 54.5 kJ/mol and the boiling point is 83.4°C (which is equivalent to 356.55 K), you can calculate the change in entropy (ΔS) using the equation ΔS = ΔHvap / T, where T is the temperature in Kelvin.

ΔS = 54.5 kJ/mol / 356.55 K = 153 J/K mol

Therefore, the correct option is D. 153 J/K mol.

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the actual quantity of nitrogen, phosphorus, and potassium guaranteed to be applied to the maize field is 50 kg, 50 kg, and 25 kg, respectively.

For Nitrogen (N):

The percentage of nitrogen in the fertilizer is 20%. Therefore, the amount of nitrogen applied can be calculated as:

Nitrogen = (20/100) * 250 kg

Nitrogen = 0.2 * 250 kg

Nitrogen = 50 kg

For Phosphorus (P):

The percentage of phosphorus in the fertilizer is also 20%. Thus, the amount of phosphorus applied can be calculated as:

Phosphorus = (20/100) * 250 kg

Phosphorus = 0.2 * 250 kg

Phosphorus = 50 kg

For Potassium (K):

The percentage of potassium in the fertilizer is 10%. So, the amount of potassium applied can be determined as:

Potassium = (10/100) * 250 kg

Potassium = 0.1 * 250 kg

Potassium = 25 kg

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Explanation:

hope the picture above help u understand I did it in step so it would be easier to understand:)

Answer

1 Mg + 2 HCl 1 MgCl₂ + 1 H₂

(a) 182.29 grams HCl

(b) 174.71 grams

(c) .3.0 moles of hydrogen gas

Explanation

The unbalanced equation given is:

___Mg + ___HCl ___MgCl2 + ___H2

The balanced equation is

1 Mg + 2 HCl 1 MgCl₂ + 1 H₂

(a) What mass of HCl is consumed by the reaction of 2.50 moles of magnesium?

The first step is to calculate the moles of HCl consumed.

From the balanced equation;

1 mole of Mg consumed 2 moles of HCl

So, 2.50 moles of Mg will consume

The final step is to convert 5.0 moles of HCl to mass using the mole formula.

Molar mass of HCl = 36.458 g/mol

Therefore, the mass of HCl consumed by the reaction of 2.50 mol of Mg is 182.29 grams.

(b) What mass of MgCl2 is produced if 3.67 moles of HCl react?

Also, the first step is to calculate the moles of MgCl₂ produced.

From the balanced equation;

2 moles of HCl produced 1 mole of MgCl₂

So, 3.67 moles of HCl will produce

The final step is to convert 1.835 mol MgCl₂ produced to grams using the mole formula.

Molar mass of MgCl₂ = 95.211 g/mol

The mass of MgCl₂ produced is 174.71 grams.

c. How many moles of hydrogen gas are produced when 3.0 moles of magnesium react?

From the balanced equation above;

1 mole of Mg produced 1 mole of H₂

Thus, 3.0 moles of Mg will produce

Hence, the moles of H₂ produced is 3.0 moles.

Answer:

Which separation method is used to separate metals?

Answer : Liquation

Which are the separation methods used in agriculture?

Answer : Handpicking,Threshing,Winnowing,Evaporation and Condensation

Explanation:

Hope it's help. :-)

Answer:

1. Liquation (metals)

Liquation is a metallurgical method for separating metals from an  ore or alloy. The material must be heated until one of the metals starts to melt and drain away from the other and can be collected.

2. Threshing and winnowing ( agriculture )

Wind winnowing is an agricultural method developed by ancient cultures for separating grain from chaff. It is also used to remove weevils or other pests from stored grain.

Threshing, the loosening of grain or seeds from the husks and straw, is the step in the chaff-removal process that comes before winnowing.

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

line graph

Explanation:

i just did the instruction :)

Answer:

line graph

Explanation:

edge chemistry

Answer:

The precise fit on the ring stand. The ability to hold more substance than a test tube. A shallow bottom to increase the surface area of a liquid, leaving the solid behind.

Explanation:

Q and A!

How does an evaporating dish work?

Evaporating dishes are used to evaporate excess solvents – most commonly water – to produce a concentrated solution or a solid precipitate of the dissolved substance. ... The dish is heated with a Bunsen burner, until only stable precipitate remains, which contains the silica content.

What does a evaporating dish looks like?

The evaporating dish is a small bowl with a spout, usually made of porcelain or borosilicate glass. As its name suggests, it is commonly used to evaporate solvents in a sample. The evaporating dishes we encounter in a chemistry lab usually accommodate small samples.

The new volume of the gas at 20 °C is 205 mL

The correct answer to the question is Option C. 205 mL

From the question given, the following data were obtained:

Initial volume (V₁) = 250 mL

Initial temperature (T₁) = 25 °C = 25 + 273 = 298 K

Initial pressure (P₁) = 10 atm

Final temperature (T₂) = 20 °C = 20 + 273 = 293 K

Final pressure (P₂) = 12 atm

The new volume of the gas can be obtained by using the combine gas equation as follow:

\( \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\ \\ \frac{10 \times 250}{298} = \frac{12 \times V_2}{293} \\ \\ cross \: multiply \\ \\ 298 \times 12 \times V_2 = 10 \times 250 \times 293 \\ \\ divide \: both \: side \: by \: 298 \times 12 \\ \\ V_2 = \frac{10 \times 250 \times 293}{298 \times 12} \\ \\ V_2 = 205 \: mL \\ \)

Therefore, the new volume of gas is 205 mL

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Gasoline, which is composed of a variety of different liquid hydrocarbons that do not separate as time passes is an example of compound.

A compound is a substance formed by chemical union of two or more ingredients in definite proportions by weight.

A compound is a type of pure substance that does not separate easily via chemical or physical means.

According to this question, gasoline is composed of a variety of different liquid hydrocarbons, which do not separate as time passes.

Gasoline is specifically a liquid consisting of a mixture of refined petroleum hydrocarbons and is mainly used as a motor fuel e.g. petrol.

This suggests that gasoline is an example of a compound because it is made up of several other substances that do not separate readily.

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Answer:

The answer is that light is faster than sound.

Explanation:

A good example is of lightning and thunder during a thunderstorm.

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The half-life of a compound if 42% of a given sample of the compound decomposes in 60 min is 45.1 min (rounded to one decimal place).

In a first-order reaction, the rate of decomposition is directly proportional to the concentration of the reactant.

That is, the reaction rate (R) is proportional to the concentration (C) raised to the power of :

1.Rate of reaction = - dC/dt = kC

Where k is the rate constant and t is the time taken.

Therefore, the integrated form of the equation for first-order kinetics is:

ln [C]t - ln [C]0 = - kt

Where [C]t and [C]0 are the concentrations at time t and at time zero respectively, k is the rate constant, and t is the time taken for the reaction to proceed.

The half-life of a reaction is the time taken for half of the reactant to be consumed,

i.e., when [C]t = [C]0 / 2.

Substituting these values into the integrated equation, we have:

ln ([C]0 / 2) - ln [C]0 = - kt12 ln 1/2 = - kt1/2 = (ln 2) / k

Now we can use the half-life equation to find k: 60 min

= t1/2

= (ln 2) / kk

= 0.0116 min-1

Now that we know the rate constant, we can use the integrated equation to find the half-life of the reaction for 42% decomposition.

Using 0.42[C]0 and solving for t, we get:

t = 45.1 min

Therefore, the half-life of the reaction for 42% decomposition is 45.1 min.

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Answer:

True

Explanation:

A balanced chemical equation always obeys the law of conservation of mass. According to this law, the mass of products must be equal to the mass of reactants. A reaction is said to be balanced when the total mass of atoms on both sides of the chemical reaction is equal.

Phenolphthalein is a drab, vulnerable acid that is appreciably used as a hallmark in titration experiments to suggest the endpoint of the titration. The endpoint is indicated with the useful resource of the formation of red color on the grounds that this compound dissociates to shape crimson anions at the same time as dissolved in water.

Titration of an antacid consists of a strong acid-susceptible base titration whose pH at the endpoint is plenty much less than seven. therefore, bromophenol blue rather than phenolphthalein is used as a trademark because the pH range of bromophenol blue is a whole lot less than seven. The pH range of phenolphthalein lies above seven.

The use of CO₂ and its impact on the signs, Phenolphthalein is often used as a hallmark in acid-base titrations. Phenolphthalein is often used as an indicator in acid-base titrations. For this utility, it turns colorless in acidic answers and crimson in simple solutions. It belongs to the elegance of dyes referred to as phthalein dyes.

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Answer:

Because elements of group  1 does not have stable electronic configuration and elements of group 18 have stable electronic configuration.

Explanation:

Because elements of group 1 do not contain stable electronic configuration and elements of group 18 include stable electronic configuration.

Group 1 elements contain the alkali metals, Li, Na, K, Rb, Cs, and Fr. The alkali metals exist all soft, shiny, and metallic when cut. They react efficiently with water, have low melting points and densities, and are good conductors of electricity. They all include one valence electron that they lose easily to form ions. Noble gas exists as any of the seven chemical elements that create up Group 18 (VIIIa) of the periodic table. The elements exist as helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

The element of group 1 exist as reactive but those of group 18 exist as inert Because elements of group 1 do not contain stable electronic configuration and elements of group 18 include stable electronic configuration.

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Answer:

0.67 atm

Explanation:

From the question,

Applying Boyles law

PV = P'V'......................... Equation 1

Where P = Initial Pressure of the sample of gas, P' = Final pressure of the sample of gas, V = Initial volume of the sample of gas, V' = Final volume of the sample of gas.

make P' the subject of the equation above

P' = PV/V'.................... Equation 2

Given: P = 10.0 L, V = 1.0 atm, V' = 15.0 L

Substitute these values into equation 2

P' = (10.0×1.0)/15.0

P' = 0.67 atm

Answer:Because there are so many units for energy.

Explanation:

Intermolecular  forces  of attraction prevent ice cubes from adopting the shape of their container,intermolecular forces are overcome when ice melts,intermolecular forces are overcome when liquid water is vaporized and for conversion to hydrogen and oxygen gas intramolecular forces are overcomed.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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The gas-phase decomposition of SO2Cl2 is a first-order reaction, and the rate of the reaction is given by the equation: rate = k[SO2Cl2]

The half-life of a first-order reaction is given by the equation: T1/2 = 0.693/k (a) At 600 K, the half-life for the process is 2.3 x 105 s. To find the rate constant at this temperature, we can use the half-life equation to solve for k: T1/2 = 0.693/k ;2.3 x 105 s = 0.693/k ;k = 0.693 / 2.3 x 105 s = 3 x 10^-5 s-1 , (b) At 320 degree celcius  , the rate constant is 2.2 x 10^-5 s^-1. To find the half-life at this temperature, we can use the half-life equation and substitute in the given rate constant: T1/2 = 0.693/k;T1/2 = 0.693 / 2.2 x 10^-5 s-1 ;T1/2 = 3.15 x 10^4 s Therefore, the half-life of the reaction at 320 degree celcius is 3.15 x 10^4 seconds.

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