I need help please!​

Answer:

A mixture

Explanation: I don't really have one I just know and i just can't explain it

Answer:

1.6mol

Explanation:

CH4 + 2O2 → CO2 + 2H20

From the equation,

1mole of CH4 reacted to produce 2moles of H2O.

Therefore Xmol of CH4 will react to produce 3.2moles of H2O i.e

Xmo of CH4 = 3.2/2 = 1.6mol

Therefore, 1.6mol of CH4 will react to produce 3.2moles of H2O

Using the ideal gas law, we first calculate the number of moles in the balloon using the initial conditions and then apply the combined gas law to find the new volume under increased ocean pressure. The toy balloon will have a volume of approximately 32.89 mL at the bottom of the ocean with a pressure of 95 atm and contains about 0.129 moles of gas.

To solve for the new volume of the toy balloon at the bottom of the ocean, we will use the ideal gas law and its principle that states the product of pressure (P) and volume (V) is proportional to the number of moles (n) and the temperature (T), represented as PV = nRT, where R is the ideal gas constant. Given the internal pressure of the balloon is 126.625 kPa (which is equivalent to 1.25 atm since 1 atm = 101.325 kPa) and the volume is 2500 mL at the surface, we can calculate the number of moles of gas in the balloon using the ideal gas constant (R = 8.3145 J/mol·K or 0.0821 L·atm/mol·K for calculations involving atmospheres) and the provided temperature of 285 K.

Calculating the number of moles:

Calculating the new volume at the bottom of the ocean:

Now, we apply the combined gas law to determine the new volume (V2) when the pressure is 95 atm

The new volume of the balloon at the bottom of the ocean under 95 atmospheres of pressure would be approximately 32.89 mL, and it contains about 0.129 moles of gas.

The new volume of the balloon at the bottom of the ocean is approximately 26.75 mL, and the balloon holds approximately 0.117 moles of gas.

To solve this problem, we will use Boyle's Law, which states that for a given mass of gas at constant temperature, the volume of the gas is inversely proportional to the pressure. Mathematically, this can be expressed as:

[tex]\[ P_1V_1 = P_2V_2 \][/tex]

First, we need to convert the final pressure from atmospheres to kPa to match the units of the initial pressure. We know that 1 atmosphere is approximately 101.325 kPa.

[tex]\[ P_2 = 95 \text{ atm} \times 101.325 \text{ kPa/atm} \] \[ P_2 = 9620.875 \text{ kPa} \][/tex]

Now we can use Boyle's Law to find the new volume \( V_2 \):

[tex]\[ P_1V_1 = P_2V_2 \] \[ V_2 = \frac{P_1V_1}{P_2} \] \[ V_2 = \frac{126.625 \text{ kPa} \times 2500 \text{ mL}}{9620.875 \text{ kPa}} \] \[ V_2 \approx 26.75 \text{ mL} \][/tex]

Next, to find the number of moles of gas in the balloon, we can use the ideal gas law:

[tex]\[ PV = nRT \][/tex]

We will use the initial conditions to find \( n \):

[tex]\[ n = \frac{P_1V_1}{RT} \] \[ n = \frac{126.625 \times 10^3 \text{ Pa} \times 2500 \times 10^{-6} \text{ m}^3}{8.314 \text{ J/(mol·K)} \times 285 \text{ K}} \] \[ n = \frac{126.625 \times 2.5 \text{ J}}{8.314 \times 285} \] \[ n \approx 0.117 \text{ moles} \][/tex]

Therefore, the new volume of the balloon at the bottom of the ocean is approximately 26.75 mL, and the balloon holds approximately 0.117 moles of gas."

Answer:no

Explanation:

Answer:

A. While inconsistent, his average of 1.0 kg made his results quite

accurate

Explanation:

Accuracy is how close the value you gain from test or observation compared with the real value. In this test, all tests relatively close to 1kg and the average of the test is 1kg so this tool can be considered quite accurate.

The precision determines how close the value of multiple repetitions of the test. In this case, the value varies from 0.8kg to 1.2kg. The highest value is about 50% higher than the lowest value, so the range is pretty far and the test can be considered not precise.

Yo sup??

Let the percentage of K-39 be x

then the percentage of K-40 is 100-(x+0.01)

We know that the net weight should be 39.5. Therefore we can say

(39*x+40*(100-(x+0.01))+38*0.01)/100=39.5  

(since we are taking it in percent)

39*x+40*(100-(x+0.01))+38*0.01=3950

39x+4000-40x-0.4+0.38=3950

2x=49.98

x=24.99

=25 (approx)

Therefore K-39 is 25% in nature and K-40 is 75% in nature.

Hope this helps.

Answer:79.904

Explanation:

It's right cause it's right

Answer:

The nucleus of the atom takes up most of the space.

Explanation:

The nucleus of the atom is made up of all the protons and neutrons while the rest of it is just the electron cloud which is made up of only electrons which are so much smaller compared to the nucleus that they don't effect its mass what so ever.

Answer:

the answer is water

Explanation:

because abiotic means non living and all of the other things are living

Answer:

                 The bond between XY is Covalent

Explanation:

                    Types of Bonds can be predicted by either identifying the two bonding elements or by calculating the difference in electronegativity.

                     The two atoms bonded to each other can be both metals, non-metals or one metal and the other non-metal. If both are metals then we can say that the bond is metallic. If both are non-metals then we can say that the bond is nonpolar and covalent. If one is metal and the other is non-metal then the bond between them will be ionic.

Secondly,

If, Electronegativity difference is,

              Less than 0.4 then it is Non Polar Covalent  Bonding

              Between 0.4 and 1.7 then it is Polar Covalent  Bonding

              Greater than 1.7 then it is Ionic  Bonding

As, the element X and Y have the electronegativity difference of 1.2 (which is less than 1.7 and greater than 0.4) therefore, we can say that the bond between them is covalent and it is polar in nature.

Final answer:

The bond between element X and Y with a significant difference in electronegativity of 1:2 is likely ionic, especially if the difference is greater than 1.8. Exact values of electronegativity and the types of elements involved would provide a more accurate determination.

Explanation:

The question concerns whether a bond between element X and element Y with a difference in electronegativity of 1:2 will be covalent or ionic. The electronegativity difference helps to predict the bond type. A higher electronegativity difference indicates more ionic character, whereas a lower difference suggests a covalent bond. Since '1:2' is not a standard way to express electronegativity, we can assume it refers to a ratio indicating a significant difference, suggesting that the bond may be ionic. However, the exact nature of the bond would better be determined if the exact electronegativity values were provided, considering that usually electronegativity differences greater than 1.8 lead to an ionic bond.

Additionally, the types of elements involved can provide a clue as to the bond type. For instance, a bond between a metal and a nonmetal often results in an ionic bond whereas a bond between two nonmetals is more likely to be covalent. Bonds with intermediate electronegativity differences are typically polar covalent, where the shared electrons are drawn more towards the more electronegative atom.

Answer:

gram: 743.8915    milligram: 743891.5

Explanation:

use google my friend

1.64 pounds is equivalent to 743.904 grams or 743904 milligrams; this is achieved by using the conversion factors: 1 pound equals 0.4536 kilograms and 1 kilogram equals 1000 grams.

To convert 1.64 pounds to grams and milligrams, we use the fact that 1 pound is equivalent to 0.4536 kilograms, and 1 kilogram is 1000 grams. Therefore, to get the weight in grams:

1.64 lb x 0.4536 kg/lb x 1000 g/kg = 743.904 g

Now, to convert grams to milligrams, we know that there are 1000 milligrams in one gram:

743.904 g x 1000 mg/g = 743904 mg

Thus, 1.64 pounds is equivalent to 743.904 grams or 743904 milligrams.

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Answer:

                       5.05 × 10²⁴ Zn Atoms

Explanation:

                    In order to find the number of atoms we will follow these two steps;

Step 1:  Finding out the moles of Zn as;

Moles  =  Mass / A. Mass

Moles  =  549 g / 65.38 g/mol

Moles  =  8.397 moles

Step 2: Calculating No. of Atoms as:

According to Avogadro's Law, each mole contains 6.022 × 10²³ particles. These particles can be any entity i.e. atoms, molecules, formula units, ions e.t.c. So,

No. of Atoms  =  Moles × 6.022 × 10²³ atoms/mol

No. of Atoms  =  8.397 mol × 6.022 × 10²³ atoms/mol

No. of Atoms  =  5.05 × 10²⁴ Zn Atoms

Answer:

D. The ionic number.

Explanation:

Whenever an element losses or gains an electron; it becomes charged, thus turns to an ion. The ion can either be positively charged when it losses an electron or negarively charged when it gains an electron. The number shows the required number of electrons gained (negative) or lost (positive).

Answer:

The periodic table tells you the atomic number (which tells you the number of protons and electrons). It also includes the mass number, which is the sum of the protons and neutrons in the nucleus of an atom.

The periodic table provides information about the atomic number, atomic mass, electron configuration, group, and period of elements, allowing you to learn about atoms of different elements.

By examining the periodic table, you can learn important information about different elements and their atoms. The periodic table provides information about the atomic number, symbol, atomic mass, and electron configuration of each element. For example, the atomic number tells you the number of protons in an atom, while the electron configuration gives you information about the arrangement of electrons in different energy levels. Additionally, the periodic table also allows you to determine the group and period of an element, which can provide insights into its chemical properties.

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Answer: no

Explanation:

Answer:

Sunlight travels through space without the aid of fluids or solids.

Explanation:

By definition, radiation is transfer of heat without a medium.

All other options are have convection involved in them, not radiation.

Answer:

Sunlight travels through space without the aid of fluids or solids

Explanation:

Answer:

Below.

Explanation:

For safety reasons.

The fuel is very volatile and the vapour is very inflammable.

Petrol pump attendants close the fuel cap quickly to prevent the evaporation of volatile gasoline, to minimize the risk of overfills and spills, and to maintain the integrity of air gaps in fuel tanks which allows for safe expansion and contraction of the fuel.

When a petrol pump attendant quickly closes the fuel cap after filling a vehicle's tank, it is primarily to prevent the evaporation of gasoline. Gasoline is a volatile, complex mixture of hydrocarbon compounds that can easily vaporize at normal temperatures, leading to a significant loss of fuel due to evaporation. This is why the fuel cap must be securely fastened immediately after refueling.

Moreover, overfilling tanks is a safety hazard that can lead to spills, and in the presence of an ignition source, there is a potential for explosions causing serious property damage, environmental issues, and injury. Therefore, it is also important to avoid over-filling and ensure that fuel levels are appropriate, and safety measures such as securing the cap promptly are critical.

Additionally, fuel tanks, including underground storage tanks (USTs), are designed with air gaps to allow for the expansion and contraction of the liquids. This prevents the leaking of gasoline around the cap or the bursting of the tank. Closing the fuel cap tightly and quickly helps maintain the integrity of these air gaps and prevents the escape of gasoline vapors into the atmosphere.

Answer: 1.4 moles Mg(NO3)2

Explanation: Solution attached:

Convert the formula units of Mg(NO3)2 to moles using the Avogadro's number.

Answer:

[tex]\large \boxed{\text{c = 2.50 mol/L; b = 3.96 mol/kg }}[/tex]

Explanation:

1. Molar concentration

Let's call chloroform C and acetone A.

Molar concentration of C = Moles of C/Litres of solution

(a) Moles of C

Assume 0.187 mol of C.

That takes care of that.

(b) Litres of solution

Then we have 0.813 mol of A.

(i) Mass of each component

[tex]\text{Mass of C} = \text{0.187 mol C} \times \dfrac{\text{119.38 g C}}{\text{1 mol C}} = \text{22.32 g C}\\\\\text{Mass of A} = \text{0.813 mol A} \times \dfrac{\text{58.08 g A}}{\text{1 mol A}} = \text{47.22 g A}[/tex]

(ii) Volume of each component

[tex]\text{Vol. of C} = \text{22.32 g C} \times \dfrac{\text{1 mL C}}{\text{1.48 g C}} = \text{15.08 mL C}\\\\\text{Vol. of A} = \text{47.22 g A} \times \dfrac{\text{1 mL A}}{\text{0.791 g A}} = \text{59.70 mL A}[/tex]

(iii) Volume of solution

If there is no change of volume on mixing.

V = 15.08 mL + 59.70 mL = 74.78 mL

(c) Molar concentration of C

[tex]c = \dfrac{\text{0.187 mol}}{\text{0.07478 L}} = \textbf{2.50 mol/L }\\\\\text{ The molar concentration of chloroform is $\large \boxed{\textbf{2.50 mol/L}}$}[/tex]

2. Molal concentration of C

Molal concentration = moles of solute/kilograms of solvent

Moles of C = 0.187 mol

Mass of A = 47.22 g = 0.047 22 kg

[tex]\text{b} = \dfrac{\text{0.187 mol}}{\text{0.047 22 kg}} = \textbf{3.96 mol/kg }\\\\\text{The molal concentration of chloroform is $\large \boxed{\textbf{3.96 mol/kg}}$}[/tex]

The molarity and molality of a solution can be calculated given the mole fraction of two components, their densities, and molar masses. The acetone will have a larger volume in the solution due to its higher mole fraction. By obtaining the masses of each component for a given volume, the number of moles of each can be calculated and used to compute molarity and molality.

The subject of this question involves the calculation of molarity and molality of a solution. First, let us understand what molarity and molality mean. Molarity (M) is the number of moles of solute per liter of solution. Molality (m) is the number of moles of solute per kilogram of solvent.

Given that the mole fraction of chloroform (Cx) is 0.187, the mole fraction of acetone (Ay) can be calculated as 1 - Cx = 1 - 0.187 = 0.813. From the densities and molar masses of chloroform (119.38 g/mol) and acetone (58.08 g/mol), we can convert these to masses for a given volume. Assuming a total volume of 1 L for the solution, we know that the acetone has more volume due to its mole fraction. We can find the number of moles of each component from these masses, and finally, compute the molarity (moles/L) and the molality (moles/kg).

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Answer:it’s D

Explanation:

Ca0 is the correct answer

Option D (CaO), which is a binary molecule made up of calcium and oxygen, is the appropriate response.

A chemical compound that only contains two elements is known as a binary compound. We'll examine each choice to see which is a binary compound.

A. Nitrogen (N) and four hydrogen (H) atoms make up this chemical, which is not binary because it comprises four different elements. It is an ammonium polyatomic ion.

B. H₂SO₄: Since it comprises three elements—hydrogen (H), sulfur (S), and oxygen (O)—it is not a binary compound. It is a sulfuric acid-related polyatomic chemical.

C. O₂: Because it just contains the element oxygen (O), this compound is not a binary one. It is an oxygen gas molecule, also referred to as molecular oxygen.

D. Calcium oxide (CaO) is a binary molecule because it simply consists of calcium (Ca) and oxygen (O). It's known as calcium oxide.

Therefore, option D (CaO), which is a binary molecule made up of calcium and oxygen, is the appropriate response.

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Answer:

it is refraction

Explanation:

Refraction plays the most important role in the functioning of this type of telescope. Therefore, the correct option is option C.

A telescope is a device that uses electromagnetic radiation to examine distant objects through their emission, absorption, or reflection.   Originally referring only to an optical instrument that used lenses, reflectors, or perhaps a combination of the two to notice distant objects,

The earliest functional telescopes are refracting telescopes using glass lenses, which were created in the Netherlands in the early 17th century. They were employed for both terrestrial and astronomical purposes. Refraction plays the most important role in the functioning of this type of telescope.

Therefore, the correct option is option C.

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Answer:

46

Explanation:

C=12

H=1

O=16

Therefore

(12x2)+6+16= 46

Answer: 46u

Explanation:C2= (12*2)

H5= (1*5)

O= (16*1)

H= (1*1)

Molecular Mass= C2+H5+O+H

= 24+5+16+1

= 46u

The temperature of water is cooler in deep oceans. The temperature there goes to 0°C to -3°C below which the water freezes. The water on the surface of the oceans and deep inside it varies because of the difference in energy of the two layers. One of the widest use of cold water is air conditioning. Cold water has a higher density than warm water. Water gets colder with profundity since chilly, salty sea water sinks to the base of the sea beds underneath the less dense hotter water close to the surface.

Answer:

330

Explanation:

110 times 3

The 110 yards length of the field at BBVA Compass Stadium is equivalent to 330 feet when converted using the fact that 1 yard equals 3 feet.

The length of the field at BBVA Compass Stadium in question is 110 yards. We can convert yards to feet by using the fact that 1 yard is equivalent to 3 feet.

Therefore, multiplying 110 yards by 3 yields a result of 330 feet.

This conversion is commonly utilized because yards and feet are both units used in the US customary system of measurement, thus are commonly interchangeable depending on the context or the precision required.

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Thermal energy transfer shapes the Earth's surface through mantle convection causing geological activity and through the evaporation and precipitation cycle that alters landscapes.

Thermal energy transfer in the Earth can change the landscape in a number of ways. Here are two examples:

In summary, the process of convection within the Earth's mantle and the evaporation and precipitation cycle are crucial for understanding how thermal energy transfer can shape the Earth's surface over time.

Answer:

44.2124+0.81 = 45.0224 + 7.335 = 52.3574

Answer:

Atoms form chemical bonds to make their outer electron shells more stable. ... An ionic bond, where one atom essentially donates an electron to another, forms when one atom becomes stable by losing its outer electrons and the other atoms become stable (usually by filling its valence shell) by gaining the electrons.

Explanation:

Answer:

D.

Bonding gives an atom the same number of electrons as a noble gas.

Explanation:

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