Question 2:
ter:
What type of matter has a fixed
composition?
A - Pure Substances
B- Elements
C - Mixtures
D-A&B

Answer:

C

Explanation:

Answer:

D

Explanation:

it seems the most logical

Answer:

B

Explanation:

6.00 ml

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The ideal gas law formula is used to determine the missing values in questions. When dealing with problems that require solving for missing values using the ideal gas law formula, always ensure that all values are expressed in the correct units and temperature is converted to kelvin.

The ideal gas law formula is represented as PV = nRT, where P represents pressure, V represents volume, n represents the number of moles of gas, T represents the temperature in kelvin, and R represents the universal gas constant. Solve for missing values using the ideal gas law formula:1. 10°C, 5. 5 L, 2 mol, __ atm.The temperature must be converted to kelvin first: T(K) = T(°C) + 273.15K = 10°C + 273.15 = 283.15KPV = nRT

Rearrange the equation to isolate P: P = nRT / V

Substitute the given values:

P = (2 mol)(0.0821 L•atm/mol•K)(283.15K) / 5.5 L

: P = 8.28 atm

2. __ °C, 8. 3 L, 5 mol, 1. 8 atm.The equation PV = nRT can be rearranged to T = PV / nRThe temperature must be converted to kelvin first: T(K) = T(°C) + 273.15T = PV / nR

Substitute the given values: T = (1.8 atm)(8.3 L) / (5 mol)(0.0821 L•atm/mol•K)T(K) = T +

: T = 332 K or 59°C

The temperature must be converted to kelvin first:

T(K) = T(°C) + 273.15K

= 12°C + 273.15

= 285.15

KPV = nRT

Solve for n by rearranging the equation: n = PV / RT

Substitute the given values: n = (1.2 atm)(3.4 L) / (0.0821 L•atm/mol•K)(285.15K): n = 0.141 mol

The ideal gas law formula is used to determine the missing values in questions. When dealing with problems that require solving for missing values using the ideal gas law formula, always ensure that all values are expressed in the correct units and temperature is converted to kelvin.

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Answer:

specular reflection reflects all light which arrives from a given direction at the same angles where diffus reflection reflects light in a broad range of direction

Answer:

stay the same.

Explanation:  Period 3 consists of the full 1s, 2s, and 2p electron orbitals, plus the 3s and 3p valence orbitals, which are filled with a total of 8 more electrons as we move from left (Na) to the far right (Ar):

Na:  1s2 2s2 2p6 3s1

Ar:    s2 2s2 2p6 3s2 3p6

As we move from left to right, and ignoring the already-filled 1s, 2s, and 2p orbitals, the period three starting and ending elements have the following:

Na: 3s1

Ar: 3s2, 3p6

All the new electrons electrons filled the third energy level (3s and 3p).  So the energy level does not change, just the orbitals.

Answer:

livermorium

Explanation:

The atom with the largest number of neutrons is a tie between livermorium and tennessine. Each of these atoms contain 177 neutrons.

Answer:

firer burning I'm thinking

Growing rice results in the release of methane (CH4) into the atmosphere. Option A is correct.

Rice cultivation is a major source of methane emissions globally. Methane is a potent greenhouse gas, with a global warming potential more than 25 times greater than carbon dioxide over a 100-year time horizon.

Methane is produced during the anaerobic decomposition of organic matter in flooded rice paddies, where oxygen is limited. Rice plants also release methane from their roots through a process called methanogenesis, which is facilitated by certain types of bacteria that live in the soil.

In addition to rice cultivation, methane is also produced by livestock, natural gas and oil production, and landfills. Reducing methane emissions is an important strategy for mitigating climate change, as methane has a significant impact on the Earth's radiative balance and contributes to the warming of the planet.

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The theoretical yield of carbon dioxide would be 333.7 g while the percent yield would be 93.5%

From the equation of the reaction: 2C2H6(g) + 702(g) → 4CO2(g) + 6H2O

Mole ratio of C2H6 and CO2 = 2:4 or 1:2

Mole of 114 g C2H6 = 114/30.07

                                  = 3.79 moles

Equivalent mole of CO2 = 3.79 x 2

                                          = 7.58 moles

Theoretical yield of CO2 = 7.58 x 44.01

                        = 333.7 g

If 312 g is actually produced;

Percent yield = yield/theoretical yield x 100%

                       = 312/333.7 x 100%

                        = 93.5%

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This question is providing the mass of ethane that is burnt in excess oxygen as 114 g. Thus, the theoretical and percent yields are required given 312 g of carbon dioxide is actually produced. At the end, the results turns out to be 334 g and 93.4 %.

In chemistry, we can analyze combustion reactions as those between a fuel, usually a hydrocarbon, and oxygen to produce carbon dioxide and water. Therefore, this problem's combustion reaction is:

\(2C_2H_6(g) + 7O_2(g) \rightarrow 4CO_2(g) + 6H_2O (g)\)

Thus, we can calculate the mass of carbon dioxide product via stoichiometry.

In chemistry, we use stoichiometry as a tool to perform mole-mass relationships based on given balanced chemical equations. In such a way, since we are given 114 g of ethane, one can calculate the produced carbon dioxide with the following stoichiometric setup:

\(114gC_2H_6*\frac{1molC_2H_6}{30.07gC_2H_6}*\frac{4molCO_2}{2molC_2H_6}* \frac{44.01gCO_2}{1molCO_2}\)

Where 30.07 is the molar mass of ethane, 4:2 the mole ratio of carbon dioxide to ethane and 44.01 the molar mass of carbon dioxide. Thereby, we obtain the following theoretical yield:

\(334gCO_2\)

Finally, we calculate the percent yield with:

\(Y=\frac{actual\ yield}{theoretical\ yield} *100\%\\\\Y=\frac{312g}{334g}*100\%\\ \\Y=93.4\%\)

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Answer:

balanced

Explanation:

A driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.

Cruise control may be defined as a type of system that significantly controls the speed of a motor vehicle automatically. It maintains the speed of the vehicle constant without the use of the accelerator pedal once you selected a specific speed.

The speed of the vehicle must remain constant during the course of time. This is possible when the force acting on the driver must be in a balanced state. Otherwise, it will be difficult for the driver to sustain the same speed for a long time.

Therefore, a driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.

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In metal casting, a casting pattern is a replica or model of the final product that is used to create a mold cavity. The pattern is typically made of wood, metal, or plastic and has the same shape and dimensions as the final product.

A flask is a container used to hold the casting sand and support the pattern during the molding process. It is typically made of metal and consists of two halves that are separated to remove the pattern and mold after it is complete. A core is a separate mold that is placed inside the main mold to create internal features of the final product. Cores are typically made of sand or a similar material and are shaped to match the internal features of the pattern. The mold cavity is the space created in the sand by the pattern and core. It is the negative space that will be filled with molten metal to create the final product. A riser is a reservoir of molten metal that is connected to the mold cavity to provide additional molten metal to the casting as it cools and solidifies. The riser helps to ensure that the final product is free of defects and has consistent properties throughout.

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Answer:

b and In a primitive unit cell, particles or points are present only at the corners while in a centred unit cell, the particles or points are also present at other positions in addition to the corner

Explanation:

First order in the substrate and first order in the nucleophile define the rate of an SN2 reaction. The reaction rate doubles with a doubling of the substrate concentration. The rate also doubles when the concentration of the nucleophile is increased.

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Answer:

No. 4

Explanation:

Bacteria are produced from pre existing bacteria

Answer:

\( \huge \color{indigo} \boxed{a. \: aldehyde}\)

Explanation:

Pentanal is considered to be a fatty aldehyde lipid molecule. These are compounds containing more than one aldehyde group. Pentanal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.

(a) When two d, one s, and three p atomic orbitals mix:
Number of orbitals: 6 (2d + 1s + 3p)
Type of hybrid orbital: sp3d2

(b) When one p and one s atomic orbitals mix:
Number of orbitals: 2 (1p + 1s)
Type of hybrid orbital: sp

The type of hybrid orbitals formed will depend on the specific hybridization scheme used.

(a) When two d, one s, and three p atomic orbitals mix:
1. Identify the given atomic orbitals (2d, 1s, and 3p).

2. Add the number of given atomic orbitals (2 + 1 + 3 = 6). Therefore, number of orbitals is 6 (2d + 1s + 3p)
3. Determine the type of hybrid orbital by combining the atomic orbitals in the order s, p, and d (sp3d2).



(b) When one p and one s atomic orbitals mix:
1. Identify the given atomic orbitals (1p and 1s).
2. Add the number of given atomic orbitals (1 + 1 = 2). Therefore, number of orbitals is 2 (1p + 1s)
3. Determine the type of hybrid orbital by combining the atomic orbitals in the order s, p (sp).

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Answer

[H⁺] = 1.778 x 10⁻³ M

[OH⁻] = 5.624 x 10⁻¹² M

Explanation

Given:

The pH of the lemon juice = 2.75

What to find:

The [H⁺] and [OH⁻] of the lemon juice.

Step-by-step solution:

pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14.

The equation for calculating pH is

Putting the values of pH as 2.75 into the equation above, the [H⁺] of the juice can be calculated as follows:

The [H⁺] = 1.778 x 10⁻³ M

The [H⁺] and [OH⁻] of an aqeuous solution is related by

So, putting [H⁺] = 1.778 x 10⁻³ M into the relation, we have [OH⁻] of the lemon juice to be:

Therefore, [H⁺] = 1.778 x 10⁻³ M and [OH⁻] = 5.624 x 10⁻¹² M

The resulting pressure will be the average of the pressures in container A and container B.

The pressure of the resulting mixture of gases will be equal to the average of the initial pressures in container A and container B. The volume of the mixture is equal to the sum of the volumes of the two containers, so the pressure will be proportional to the number of gas particles present. To find the average pressure, we can add the initial pressures in container A and container B and divide by 2. In this case, the average pressure is (2.50 atm + 4.80 atm) / 2 = 3.65 atm.

container b holds 174 ml of a different ideal gas at 4.80 atm. container a and container b are glass spheres connnected by a tube with a stopcock. container a is larger than container b. if the gases are allowed to mix together,

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Based on electronegativity of atoms, the inductive effect increases as the electronegativity of the atom increases and the electronegative atom is closer to the site of the acidic proton.

The inductive effect occurs due to the difference in electronegativity of atoms bonded together in which electronegative atoms increases the acidity but decreases the basicity of a compound.

The inductive effect is becomes stronger with decreasing distance between atoms, thus it is effective across short distances only.

Therefore, the inductive effect increases as the electronegativity of the atom increases and the electronegative atom is closer to the site of the acidic proton.

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The 0.1857 mg/L additional concentration of nitrogen the river water due to the farmer' fertilizer.

Please take a look at our nitrogen-rich fertilizers, which consist of the following: if you want to increase the nitrogen content of your soil. 21-0-0 Ammonium Sulfate 4-0-0 Crustacean Meal. 12-0-0 Feather Meal.

Manures, ground-up animal parts (blood meal, feather dust, leather dust), and seed meals are the richest organic sources of nitrogen (soybean meal, cottonseed meal).

Given that a farmer uses 1550.1 kg of fertilizer → 10% nitrogen

15% of the fertilizer is said to be washed into the river,

(15/100) × 1550.1 = 232.51 kg

The amount of  nitrogen molecule in the washed fertilizer is :

10%  of 232.51 kg

= (10/100) × 232.51 kg

= 0.1 × 232.51 kg

=kg in a year.

The river flows at an avg. rate of 0.1401 ft³/sec

Then the amount of river water in a year = \(0.1401\frac{ft^3}{sec} *3.155*10^7sec\)

since 1 ft³ = 28.3168 L

the amount of river water in a year = \(0.1401(28.3168)*3.155*10^7\)

the amount of river water in a year = 125164645

The concentration of nitrogen molecule= mass/volume

\(=\frac{ 23.25 *10^6mg}{125164645L}\)

= 0.1857 mg/L

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Answer:

it expands

Explanation:

this is because when it get warmer it runs out of room and makes it got up the tube.

D) 4. 4  Molecules Are Polar in XeCl_2 COF_2 PCl_4F SF_6. While the molecule's S-F bonds are polar, it is nonpolar due to its octahedral shape and lack of lone pairs.

The existence of polar bonds and the molecular geometry affect a molecule's polarity. When the electronegativity of the atoms making the bond differs significantly, the bond is said to be polar. To ascertain each molecule's polarity:

XeCl2: Because of the difference in electronegativity, Xe-Cl bonds are polar, but because the molecule is linear, it is not polar.

COF2: It is polar because the C-O and C-F bonds are polar and the molecular geometry is trigonal planar.

PCl4F: The molecule has a tetrahedral shape with one lone pair, which makes the P-Cl bonds in the compound polar.

SF6: While the molecule's S-F bonds are polar, it is nonpolar due to its octahedral shape and lack of lone pairs.

The (C)1 molecule (COF2) is polar, thus that is the correct response.

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True. The effect of uncoupling reagents is a consequence of their ability to carry protons through membranes.

Uncoupling reagents, also known as uncouplers, are substances that disrupt the normal process of oxidative phosphorylation in mitochondria. They achieve this by transporting protons across the inner mitochondrial membrane, bypassing the ATP synthase enzyme responsible for ATP production.
When protons are carried through membranes by uncoupling reagents, the electrochemical gradient, which is essential for the synthesis of ATP, is diminished. This process effectively "uncouples" the respiratory chain from ATP synthesis, leading to a decrease in ATP production and an increase in heat generation. As a result, the energy generated from the electron transport chain is released as heat rather than being utilized for ATP synthesis.
In summary, uncoupling reagents carry protons through membranes, which leads to the disruption of oxidative phosphorylation and a decrease in ATP production. This effect is a direct consequence of their ability to transport protons across the inner mitochondrial membrane.

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Answer: 324 g (to 3 sf)

Explanation:

Based on the coefficients of the equation, we know that when 3.00 mol of water is consumed, 3.00 mol of carbon dioxide is also consumed.

Thus, the formula mass of carbon dioxide is:

\(6(15.9994)+12.011=108.0074\) g/mol.

Thus, 3.00 mol has a mass of (108.0074)(3.00)=324 g (to 3 sf)

The second quantum number (l) describes which sublevel the electron is in

Answer:

10 g

Explanation:

Right from the start, just by inspecting the values given, you can say that the answer will be  

10 g

.

Now, here's what that is the case.

As you know, a substance's specific heat tells you how much heat is needed to increase the temperature of  

1 g

of that substance by  

1

∘

C

.

Water has a specific heat of approximately  

4.18

J

g

∘

C

. This tells you that in order to increase the temperature of  

1 g

of water by  

1

∘

C

, you need to provide  

4.18 J

of heat.

Now, how much heat would be required to increase the temperature of  

1 g

of water by  

10

∘

C

?

Well, you'd need  

4.18 J

to increase it by  

1

∘

C

, another  

4.18 J

to increase it by another  

1

∘

C

, and so on. This means that you'd need

4.18 J

×

10

=

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

.

Now look at the value given to you. If you need  

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

, what mass of water would require  

10

times as much heat to increase its temperature by  

10

∘

C

?

1 g

×

10

=

10 g

And that's your answer.

Mathematically, you can calculate this by using the equation

q

=

m

⋅

c

⋅

Δ

T

, where

q

- heat absorbed/lost

m

- the mass of the sample

c

- the specific heat of the substance

Δ

T

- the change in temperature, defined as final temperature minus initial temperature

Plug in your values to get

418

J

=

m

⋅

4.18

J

g

∘

C

⋅

(

20

−

10

)

∘

C

m

=

418

4.18

⋅

10

=

10 g

Answer:

121 million joules energy is released

Explain :

As there are 500 moles of hydrogen gas in a kilogram, this means that burning a kilogram of hydrogen gas releases 500 times as much energy or 121 million joules .

171.34 grams of (Ba(OH)2) is needed to make a 1.00 M aqueous solution.

To determine how many grams of (Ba(OH)2) are needed to make a 1.00 M aqueous solution, we need to use the formula:
Molarity (M) = moles (mol) / liters (L)
First, we need to determine the number of moles of (Ba(OH)2) needed for 1.00 M solution. Since the molar mass of (Ba(OH)2) is 171.34 g/mol, we can use the following formula:
moles (mol) = Molarity (M) x liters (L)
Since we don't know the volume of the solution, we can assume that we want to make a 1 L solution. Therefore, we have:
moles (mol) = 1.00 mol/L x 1.00 L = 1.00 mol
Now, we can use the following formula to find the mass of (Ba(OH)2) needed:
mass (g) = moles (mol) x molar mass (g/mol)
mass (g) = 1.00 mol x 171.34 g/mol = 171.34 g

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The component of paint with which the colored pigment is mixed to make it adhere to a surface is called a binder or a resin.

The binder acts as a glue that holds the pigment particles together and attaches them to the surface. It provides adhesion, durability, and cohesion to the paint film.

Binders in paint can be made from various materials, such as acrylics, alkyds, polyurethanes, or oils. These binders form a film as the paint dries and hardens, effectively binding the pigment particles and creating a protective and adherent layer on the surface.

The choice of binder depends on the specific application and desired properties of the paint. For example, acrylic binders are commonly used in water-based paints due to their fast drying time and excellent adhesion to various surfaces. Alkyd binders, which are oil-based, are often used in oil-based paints for their durability and resistance to weathering.

Overall, the binder is a crucial component of paint that enables the colored pigment to adhere to surfaces, providing protection, longevity, and the desired aesthetic appearance.

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The two types of inner transition metals are the lanthanides and the actinides. The lanthanides consist of the elements from cerium (atomic number 58) to lutetium (atomic number 71). The actinides consist of the elements from thorium (atomic number 90) to lawrencium (atomic number 103).

The lanthanides are also called the rare earth elements, and they tend to have similar chemical properties due to their close proximity on the periodic table. They are all silvery-white metals and are often used in industrial and manufacturing processes.
The actinides are also silvery-white metals, but they tend to be more radioactive than the lanthanides and have less predictable chemical properties. They are generally only found in small amounts in nature, and are mostly produced synthetically for research and industrial uses.

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