Is gasoline a homogeneous or heterogeneous mixture.

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

100.985

Explanation:

Answer:

5ppm

Explanation:

there are 1 million (1,000,000) µg (micrograms or mcg) per g (gram) ("micro" means millionth). So, 4. 1 part per million (ppm) for a 1g sample is 1 µg or .

I know you said no links, but this is a converter that explained it much better than I know how to

http://www.endmemo.com/sconvert/ppmug_g.php#:~:text=%C2%BB%20Microgram%2Fgram%20Conversions%3A&text=ug%2Fg%E2%86%94ppm%201%20ug%2Fg%20%3D%201%20ppm

heres a screenshot of the site (since i understand links are awful)

folic Acid

Folic acid, often known as folate, is a water-soluble B vitamin that is necessary for the generation of healthy red blood cells and the regular functioning of the brain system. Folate is present in numerous foods, including leafy green vegetables, legumes, nuts, and grains. Numerous processed goods, including breakfast cereals, breads, and rice, contain it as well. Folic acid is essential for pregnant women because it prevents birth abnormalities. It is also crucial for people of all ages since it helps maintain the health and normal operation of the body's cells. Folic acid is also essential for the production and repair of DNA, as well as the breakdown of specific proteins. Without appropriate folic acid, the body cannot produce red blood cells effectively, which can result in anemia. It is essential to consume adequate amounts of folic acid through diet or supplementation.

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When 50 grams of water are cooled from 70C to 60C then 2090 joules of heat are released.

The amount of heat released when cooling water, we can use the formula:

Q = m * c * ΔT

Where:

Q is the heat energy released or absorbed (in joules)

m is the mass of the substance (in grams)

c is the specific heat capacity of the substance (in joules per gram-degree Celsius)

ΔT is the change in temperature (in degrees Celsius)

For water, the specific heat capacity is approximately 4.18 J/g°C.

Let's plug in the values for your scenario:

m = 50 grams

c = 4.18 J/g°C

ΔT = (60°C - 70°C) = -10°C (negative because the temperature is decreasing)

Q = 50 g * 4.18 J/g°C * (-10°C)

Q = -2090 J

The negative sign indicates that heat is being released. Therefore, when 50 grams of water are cooled from 70°C to 60°C, approximately 2090 joules of heat are released.

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Around 2090 joules of heat are released when 50 grams of water are cooled from 70°C to 60°C.

To calculate the heat released when cooling water, you can use the formula:

Q = m * C * ΔT

Where:

Q is the heat released or absorbed (in joules)

m is the mass of the substance (in grams)

C is the specific heat capacity of the substance (in joules per gram per degree Celsius)

ΔT is the change in temperature (in degrees Celsius)

For water, the specific heat capacity is approximately 4.18 joules per gram per degree Celsius.

Given:

m = 50 grams

ΔT = 60°C - 70°C = -10°C (negative because the temperature is decreasing)

Substituting the values into the formula:

Q = 50 g * 4.18 J/g°C * (-10°C)

Q = -2090 J

The negative sign indicates that heat is being released by the water as it cools. Therefore, 2090 joules of heat are released when 50 grams of water are cooled from 70°C to 60°C.

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A replacement reaction is one wherein a set of atoms is replaced by another atom in a molecule. In the given reactions is 2Na + Cl₂ → 2NaCl is not a replacement reaction.

A displacement reaction also known as a replacement reaction can be defined as one wherein an atom is displaced by another atom in a molecule. For example, when iron (Fe) is added to a solution of copper sulfate (CuSO₄), it displaces the copper (Cu) metal.

A single replacement reaction can be described as a kind of redox reaction when an element moves out of a compound, one element is replaced by the other in its own compound.

\(A +BC\longrightarrow AB +C\)

Double replacement reactions take place mostly in aqueous solutions wherein the ions precipitate and the exchange of ions occurs. The double replacement reaction can be represented as:

\(AB +CD\longrightarrow AC +BD\)

Therefore, option (D) is correct.

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360g is the mass of Argon present in a sample occupying 76.3L at 31C and 240 kPa of pressure.

A body's mass is an inherent quality. Prior to the discoveries of the atom or particle physics, it was widely considered to be tied to the amount of matter within a physical body.

It was discovered that, despite having the same quantity of matter in theory, different atoms and elementary particles have varied masses. There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent.

P×V = n×R×T  

240 ×76.3= n×0.821×310

n=10 moles

mass = 10×36=360g

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Biometrics was first applied to law enforcement by Alphonse Bertillon, a French police officer, and researcher who borrowed the anthropological method of anthropometry to develop a biometric identification system therefore option D. is the right choice.

The police department's use of anthropometry as a means of criminal identification was the first scientific method of its kind. In the past, authorities could only track down offenders using their names or photographs. Fingerprinting ultimately replaced the technique.

Furthermore, he created the first-ever mug shot. Before Bertillon formalized the practice in 1888, offenders had already been photographed as early as the 1840s, just a few years after the introduction of photography.

In the historic Dreyfus case, Alfred Dreyfus has wrongfully convicted thanks to his faulty evidence.

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Answer:

118.5 grams

Explanation:

150*0.79 because there are 0.79 grams in a milliliter and we need to find out how many are in 150 milliliters

Answer:

11.2

Explanation:

Find molar mass of carbon 12.01 g/mol then divide by 6.00 g of Carbon, then divide by STP 22.4 L = 11.19 and round to sig fig = 11.2 L

11.2 L volume of carbon dioxide gas is released at STP. Hence, option B is correct.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

For this question, use the formula PV=nRT firstly, define your knowns (this requires you to calculate moles of carbon)

Molar mass of carbon = 12.01 g/mol

Moles carbon=\(\frac{mass}{molar \;mass}\)

Moles carbon=\(\frac{6.00 g}{12.01 g/mol }\)

Moles carbon= 0.4995836803 moles

P=101.3 kPa

V=?

n= 6.0÷12 = 0.5

R= 8.31

T= 273 K

V= (0.5 x 8.31 x 273) ÷101.3    

=11.19

Therefore, 11.2 L of carbon dioxide will be produced.

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Answer:

The current location of the North Magnetic Pole is in the Arctic Ocean, near the coast of northern Canada, specifically in the region of northern Quebec and Ellesmere Island in the Canadian Arctic Archipelago.

Explanation:

However, it's important to note that the North Magnetic Pole is not a fixed point on the Earth's surface, but it is instead constantly moving. The North Magnetic Pole is moving away from Canada and towards Siberia at a rate of about 55 km (34 miles) per year. This movement is caused by changes in the Earth's magnetic field and is known as the "wandering" of the magnetic poles. The exact location of the North Magnetic Pole can be determined by regular measurements and it is used as a reference point for navigation.

Balanced trade refers to a situation in which a country's income from exports is equal to its expenditure on imports. This equilibrium in trade is reflected in the country's balance of trade statement, which records the value of exports and imports of goods and services. The net export, representing the difference between total exports and total imports, can be positive or negative.

In economics, a trade deficit occurs when a country's total imports surpass its total exports. Conversely, a trade surplus happens when a country's total exports exceed its total imports. These imbalances in trade are indicators of the economic relationship a country has with other nations.

The trade balance is an important concept in a country's economy and is calculated by subtracting the value of imports from the value of exports. A trade surplus occurs when a country earns more from its exports than it spends on imports, leading to increased export revenue. On the other hand, a trade deficit arises when a country's spending on imports exceeds its income from exports.

It is important to note that balanced trade does not necessarily imply a positive or negative outcome. It simply indicates a state where export earnings match import expenditures. The implications of balanced trade depend on various factors, including the country's economic goals, competitiveness, and overall economic conditions.

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The metals loses electrons forming cations while on the other hand, the non-metals gains the electrons forming anions.

Covalent bonding is a type of bonding linking two non-metallic atoms which are distinguished by the sharing of pairs of electrons joining atoms and other covalent bonds. An ionic bond is the force of appeal that holds together positive and negative ions. It forms when atoms of a metallic element loses electrons to atoms of a nonmetallic element. Ionic bonds form only allying metals and nonmetals. When two nonmetals bond, they share pairs of electrons in a covalent bond and both gets stability.

So w can conclude that A covalent bond is formed between two non-metals. The sharing of electron pairs takes place between their atoms and a covalent bond is formed.

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Answer:

Sulfur

Explanation:

Answer:

1)Filtration to remove sand

2)Evaporation to obtain sugar

Explanation:

Add water to the mixture and mix,sugar will dissolve.

Filter out the sand.

Evaporate the remaining solution to obtain the sugar.

To calculate the number of grams of O2 produced in 15 minutes, we need to find the ratio of CO2 produced to O2 consumed. The molar ratio of CO2 to O2 is 1:1, meaning that for every gram of CO2 produced, one gram of O2 is consumed.

Given that the person exhales 0.65g of CO2 every minute, we can assume that the person consumes 0.65g of O2 as well. Therefore, in 15 minutes, the person will exhale (0.65g/min) x (15 min) = 9.75 grams of CO2. Since the molar ratio of CO2 to O2 is 1:1, we can conclude that the person would also consume 9.75 grams of O2 in the same timeframe.
By assuming a molar ratio of 1:1 between CO2 and O2, we can calculate the number of grams of O2 produced in 15 minutes when a person exhales 0.65g of CO2 every minute.

Multiplying the CO2 production rate by the number of minutes gives us 0.65g/min x 15 min = 9.75 grams of CO2 produced in 15 minutes. As the molar ratio between CO2 and O2 is 1:1, this also means that 9.75 grams of O2 would be consumed in the same time period. This calculation assumes that the person is exclusively exhaling CO2 and consuming O2 at a constant rate without any other factors affecting the gas exchange process. It's important to note that this is a simplified calculation and real-world physiological processes may involve more variables.

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Polysaccharide is a type of carbohydrate (such as glycogen, cellulose, or starch) whose molecules are made up of many sugar molecules bound together.

What purpose does the polysaccharide serve?

In general, polysaccharides serve one of two purposes: they either store energy or sustain structural integrity. Highly compact polymers like starch and glycogen are employed to store energy. In plants and animals, cellulose and chitin, two linear polymers, provide structural support.

What is plant polysaccharide?

More than half of the carbs we consume come from starch, which is the most significant source of carbohydrates in the human diet. Granules of it can be found in plants. Amylose and amylopectin, two polymers, are combined to form starch. 10%–30% amylose and 70%–90% amylopectin make up natural starches.

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Answer:

write the following as fractions in their simplest form

Answer:

By the formula of current,

I = Q/t

I × t = Q

Q/I = t

Explanation:

A) t = Q / I

t = 6 / 0.5

t = 12 sec

B) t = Q / I

First we,

36mA

36 / 1000

0.036A OR 3.6 × 10¯²

t = 48 / 0.036 OR t = 48 / 3.6 × 10¯²

t = 48 × 10² / 3.6

t = 1333.3sec t = 13.3 × 10²

Recheck the answers.

Answer:

279.26K

Explanation:

T(k) = (43 + 459.67)×5/9

502.67 × 5/9

279.26 K

A substance has 0. 0152088 moles per 10 grammes. One can use the equation grams = weight / molar mass to determine this. The volume of one mole of a chemical is represented by its molar mass on the chemical elements.

You would take its weight (10g) and multiply it by the material's molar mass to determine the number of molecules within 10g of a substance. For instance, if the material is water, its molar mass is 18. 015 g/mol, meaning that 10 g is comparable to 0. 555 molecules of water.

However, the formula moles = mass / molar weight can be used to determine the number of moles in an unit weight regardless of the substance. Therefore, there are 0. 0152088 mole in 10

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Answer:

it's a chemical Element

Explanation:

symbol He

atomic number 2.

The molecular geometry or molecular shape. The arrangement of atoms in a molecule determines its molecular geometry, and this arrangement is influenced by the number and distribution of electrons in the molecule. The electrons in a molecule are distributed in various regions around the central atom, and these regions correspond to different geometric shapes.

The shapes are determined by the number of electron pairs, whether they are bonding or nonbonding pairs, and the repulsion between them. The VSEPR (Valence Shell Electron Pair Repulsion) theory is a model used to predict the molecular geometry of a molecule. This theory states that electrons repel each other and therefore, they try to get as far away from each other as possible. As a result, the geometry of the molecule is determined by the positions of the electron pairs around the central atom. In summary, the term for the geometric shape formed by bonding and nonbonding electron pairs surrounding the central atom in a molecule is called the molecular geometry or molecular shape. It is determined by the number and distribution of electrons in the molecule and is predicted by the VSEPR theory.

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When doubling the number of the moles of the HCl decrease the rate of HCl production because the acid convertase enzyme is converting HCl back into H⁺ and Cl⁻.

The reaction is as follows :

H⁺  +  Cl⁻  ⇄ HCl

If we double the number of the moles of the HCl , it decreases the rate of the HCl production because of the reason that  the acid convertase enzyme is converting the HCl back into the H⁺ and Cl⁻. The purpose of the  enzyme is to allow the conversion of the reactant to the product and the product back to the reactant

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The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Answer:

C. Carbon dioxide. (C02.)

Explanation:

Hope this helps. :)

Answer:

Carbon dioxide

Explanation:

Answer:

Cl-35 isotope is more abundant.

Explanation:

How to calculate the abundance of isotopes in a mixture from the mass of isotopes and the average atomic mass of the element?

Solution :

Say the % abundance of Cl - 35 is x, i.e, 100 units of Cl contains x units of Cl-35.

Therefore, the % abundance of Cl - 37 is (100 - x).

∴ [35 x + 37 (100-x)] = 35.45 x 100

Simplifying the above equation, we get

-2x + 3700 = 3545

Subtracting 3700 from both sides of the equation, we get

-2x = -155

or, 2x = 155

Dividing both sides of the equation by 2, we get

x = 155 ÷ 2 = 77.5

∴ 100 -x = 22.5

Thus, Cl-35 is more abundant (77.5%) than Cl-37 (22.5%).

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An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons.

An Arrhenius acid increases the number of\(H^+\) ions in the water.

According to the Arrhenius theory, a substance which has hydrogen atom and can easily give hydrogen ion or proton in its aqueous solution is called as Arrhenius acid.

For example, when hydrochloric acid is dissolved in water, it forms chloride ion (\(Cl^-\)) and hydronium ion (\(H_3O^+\)).

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