Does the strength of the intermolecular forces in a liquid change as the liquid is heated? Explain. Why does liquid viscosity decrease with rising temperature?

Answer: Resources are characterized as renewable or nonrenewable

- a renewable resource can replenish itself at the rate it is used such as solar energy, wind energy, hydro energy, and tidal energy.

- a nonrenewable resource has a limited supply such as coal, gas, nuclear energy, and fossil fuels.

Answer:

Ask the teacher man i couldnt pass because of this

Explanation:

Answer:

When we kick the ball, the force we apply to it causes it to accelerate from a speed of 0 to a speed of dozens of kilometers per hour. When the ball is released from the foot, it begins to decelerate (negative acceleration) due to the force of friction that is exerted upon it (as we observed in the previous example).

Explanation:

Answer:

C

Explanation:

Because i just had to do this on my assignment and got 100

Answer:

hey , its option c because in chemical reaction colour + evolution of gas takes place + temp. + precipitation. but also light can come in the case of chemical reaction.

The step that should be taken to remove air bubbles from the buret tip Ensure that the buret is properly clamped or held securely in an upright position.

An air bubble is a small pocket or sphere of air trapped within a liquid or a solid substance. In the context of liquids, such as water or other fluids, air bubbles often form due to the presence of dissolved gases (like oxygen or carbon dioxide) or through mechanical means like agitation or turbulence. When a liquid is agitated or subjected to pressure changes, it can cause air to be trapped and form bubbles.

Air bubbles are also commonly found in various solid materials, such as glass, plastic, or certain foods like bread or cake. During the manufacturing or baking process, gases, particularly carbon dioxide, can be released and get trapped within the material, leading to the formation of bubbles.

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Answer:

kidneys takes the waste out of the blood. It is then stored in the bladder, until the urinary tract takes the urine out of the body.

In a phospholipid molecule, the charged organic molecule that usually binds is choline or the amino acid serine.

Choline is a hydrophilic (water-loving) molecule that contains a positively charged quaternary ammonium group. It forms an electrostatic interaction with the negatively charged phosphate group on the phospholipid molecule. This interaction helps to stabilize the overall structure of the phospholipid bilayer, as choline is attracted to the polar, hydrophilic head region of the phospholipid.

Similarly, the amino acid serine can also bind to the phospholipid molecule. Serine is a hydrophilic molecule that contains a hydroxyl group. This hydroxyl group can form hydrogen bonds with the phosphate group on the phospholipid, aiding in the stabilization of the phospholipid bilayer.

These interactions between the charged organic molecules, such as choline or serine, and the phospholipid molecule are crucial for the formation and stability of cell membranes. The phospholipid bilayer is the basic structural component of cell membranes, providing a selectively permeable barrier that separates the internal cellular environment from the external surroundings. The binding of choline or serine to the phospholipid molecule helps to maintain the integrity and functionality of the cell membrane.

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In a phospholipid molecule, the charged organic molecule that usually binds is choline or the amino acid serine.

Choline is a hydrophilic (water-loving) molecule that contains a positively charged quaternary ammonium group. It forms an electrostatic interaction with the negatively charged phosphate group on the phospholipid molecule. This interaction helps to stabilize the overall structure of the phospholipid bilayer, as choline is attracted to the polar, hydrophilic head region of the phospholipid.

Similarly, the amino acid serine can also bind to the phospholipid molecule. Serine is a hydrophilic molecule that contains a hydroxyl group. This hydroxyl group can form hydrogen bonds with the phosphate group on the phospholipid, aiding in the stabilization of the phospholipid bilayer.

These interactions between the charged organic molecules, such as choline or serine, and the phospholipid molecule are crucial for the formation and stability of cell membranes. The phospholipid bilayer is the basic structural component of cell membranes, providing a selectively permeable barrier that separates the internal cellular environment from the external surroundings. The binding of choline or serine to the phospholipid molecule helps to maintain the integrity and functionality of the cell membrane.

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To draw the alkenes cis-1,2-dichloroethene, trans-1,2-dichloroethene, and 1,1-dichloroethene, we need to understand the concept of alkenes and their structural formulas.

Alkenes are unsaturated hydrocarbons that contain a carbon-carbon double bond. The general formula for an alkene is CnH2n. In this case, we are dealing with alkenes that contain chlorine atoms.

Let's start by drawing cis-1,2-dichloroethene. In this compound, the two chlorine atoms are on the same side of the double bond. The structural formula can be represented as follows:

```
   Cl
    |
H3C=C(Cl)
```

Now, let's move on to trans-1,2-dichloroethene. In this compound, the two chlorine atoms are on opposite sides of the double bond. The structural formula can be represented as follows:

```
   Cl     Cl
    |     |
H3C=C=CH2
```

Lastly, let's draw 1,1-dichloroethene. In this compound, there is only one carbon atom, and both hydrogen atoms are replaced by chlorine atoms. The structural formula can be represented as follows:

```
   Cl     Cl
    |     |
   C=C
```

In these structural formulas, each line represents a single bond, and each corner and end of a line represents a carbon atom. Hydrogen atoms are not explicitly shown, but we assume that each carbon atom is bonded to the appropriate number of hydrogen atoms to satisfy the valence requirements.

It's important to note that these structural formulas represent a 2D representation of the compounds. In reality, molecules are three-dimensional, and the spatial arrangement of atoms can affect the properties and reactivity of the compound. Additionally, there can be different ways to draw the same compound while maintaining the same connectivity of atoms. However, the structural formulas provided above are the most common representations for these alkenes.

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The molar heat of vaporization of sulfur dioxide is approximately 25,207 J/mol. To calculate the molar heat of vaporization of sulfur dioxide, you can use the Clausius-Clapeyron equation, which is:

ln(P2/P1) = -ΔHvap/R * (1/T2 - 1/T1)

where P1 and P2 are the vapor pressures at temperatures T1 and T2, respectively, ΔHvap is the molar heat of vaporization, and R is the ideal gas constant (8.31 J/K*mol).

First, convert the temperatures from Celsius to Kelvin:
T1 = -21.0°C + 273.15 = 252.15 K
T2 = -44.0°C + 273.15 = 229.15 K

Next, plug the values into the equation:

ln(140.5/462.7) = -ΔHvap/8.31 * (1/229.15 - 1/252.15)

Now, solve for ΔHvap:

ΔHvap = 8.31 * (ln(140.5/462.7) / (1/229.15 - 1/252.15))^-1

ΔHvap ≈ 25,207 J/mol

So, the molar heat of vaporization of sulfur dioxide is approximately 25,207 J/mol.

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Answer:

25

E

12

Explanation:

As shown in the pic

Mass number = 12 + 13 = 25

Atomic number = No of protons = 12

Oxygen gas (O2) is composed of two oxygen atoms connected together, while ozone (O3) is composed of three oxygen atoms. The two molecules have very different effects on us. Oxygen gas is essential for human life and is a vital part of the air we breathe. Ozone, on the other hand, can be toxic in high concentrations and can cause adverse health effects, including irritation of the respiratory system and damage to the lungs.

Chemical Structure is the spatial arrangement of atoms in a molecule. Chemical structure determines the molecular geometry of the molecule. Russian Chemist Alexander Butlerov acknowledged that molecules are not random clusters of atoms and functional groups but are arranged in a concrete pattern.

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Answer:

element

Explanation:

The answers include the following:

Tendons are connective fibrous tissues that attaches muscle to bone and they have a bright white color together with a strong and smooth appearance which can be observed when studied.

Tendons are very important as they help in ensuring that the movement of parts of the body are easy due to its holding some structures such as ligaments in place. It is present in all bone joints due to its numerous functions in the musculoskeletal system of organisms.

The tendon is very flexible and binds the muscles in the body to other structures which is why it is referred to as a connective tissue and the above answers are the most appropriate.

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Starch is a covalent compound as it possesses long chains of glucose molecules that are bonded through covalent bonds.

In a covalent compound, the covalent bonds are involved where the mutual sharing of electrons that can hold all atoms or molecules together. Shared electrons are difficult to give away as nuclei of two atoms together share the electrons and create the bond stronger.

Ionic compounds can be demonstrated as compounds prepared between a cation and an anion. A cation can be defined as an electropositive ion and can lose valence electrons. Similarly, anions are electronegative ions and can a tendency to gain electrons.

Starch can be defined as a polysaccharide composed of 1,4 linkages between glucose monomers. The linear polymer amylose can be defined as the most basic form of starch, while amylopectin can be defined as the branched form.

Therefore, Starch is a covalent compound because of the covalent bonds between the glucose molcules.

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When Benzoic Acid reacts with aqueous NaOH, a species of ester and Benzene named, Benzoate Ion is formed.

When Benzoic acid is reacted with aqueous NaOH, water and Sodium benzoate is formed.

Sodium benzoate is present with water, So, the sodium benzoate dissolves in water and forms benzoate ion.

Benzoate are species of ester.

Benzoate ion is soluble in water while benzoic acid is not soluble in water.

Benzoic acid forms a layer over water.

Benzoate is of great use in industrial purposes, it is used in food preservative and beauty products.

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Answer:

Element Symbol # of Atoms

Hydrogen H          9

Carbon C          8

Nitrogen N           1

Oxygen O          2

Explanation:

there are 5 elements

Answer:

frequency

Explanation:

Sounds are higher or lower in pitch according to the frequency of vibration of the sound waves producing them. A high frequency (e.g., 880 hertz [Hz; cycles per second]) is perceived as a high pitch and a low frequency (e.g., 55 Hz) as a low pitch.

To find the percent by volume concentration for 50.00 ml of a 50% NaCl solution added to more solvent to make 120.00ml of solution, we need to use the following equation:

Volume (V) = Concentration (C) x Amount (A)

We know the amount (A) of NaCl is 50.00 ml, and we know the concentration (C) is 50%. Therefore, we can rearrange the equation to solve for V:

V = 50% x 50.00 ml

V = 25.00 ml

We also know that the total volume of the solution is 120.00 ml, so we can subtract 25.00 ml from 120.00 ml to get the volume of the solvent.
120.00 ml - 25.00 ml = 95.00 ml of solvent

To calculate the percent by volume concentration, we need to divide the volume of NaCl (25.00 ml) by the total volume (120.00 ml) and multiply by 100%.
25.00 ml/120.00 ml x 100% = 20.83%

Therefore, the percent by volume concentration of 50.00 ml of a 50% NaCl solution added to more solvent to make 120.00ml of solution is 20.83%.

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The pH of a solution is a measure of the concentration of H3O+ ions in the solution. A solution with a pH of 13 has a higher concentration of H3O+ ions compared to a solution with a pH of 10.

The pH scale is a logarithmic scale that measures the concentration of hydrogen ions (H+) in a solution. The lower the pH value, the higher the concentration of H+ ions, and the higher the acidity of the solution. Given that the solution with a pH of 13 is more basic (alkaline) than the solution with a pH of 10, we can infer that the concentration of H+ ions in the solution with a pH of 13 is lower than the concentration of H+ ions in the solution with a pH of 10.

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According to the Gibbs Free Energy equation, some reactions only occur spontaneously at very high temperatures. At high temperatures, the reaction becomes spontaneous if both the entropy as well as the enthalpy are positive.

Changes in Enthalpy, Entropy, as well as Free Energy, Remember that such temperature in the Gibbs free energy equation would be the Kelvin temperature, and as such, it can only be positive. The reaction will constantly be spontaneous at any and all temperatures when H is negative and S is positive, and G's sign is going to be negative.

If a reaction happens without any outside influence, it has been said to as spontaneous. This reaction can release energy and only takes place in the specific circumstances.

Therefore, At high temperatures, the reaction becomes spontaneous if both the entropy as well as the enthalpy are positive.

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1. The absolute error is 128.76 g

2. The relative error is 0.99

3. The percentage error is 99%

From the question given above, the following data were obtained:

Absolute error = |Accepted - Measured|

Absolute error = |130 - 1.24|

Absolute error = 128.76 g

Relative error = Absolute error / accepted value

Relaive error = 128.76 / 130

Relative error = 0.99

Percenrage error = relative error × 100

Percenrage error = 0.99 × 100

Percenrage error = 99%

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Answer:

Intervention of Maillard reactions by the addition of natural and synthetic chemical compounds has previously been directed toward removing one of the reactants (the amino groups or the reducing sugars) or adding sulfur-containing compounds, such as sulfur dioxide or N-acetyl cysteine, which inhibit the reactions

Explanation:

If phosphorus with 15 neutrons, the mass number of an isotope of phosphorus is 31.

Isotopes are two or more types of atoms that have the same atomic number and position on the periodic table but differ in the number of nucleons due to the different number of neutrons in the nucleus.

An isotope is one of two or more atomic types of a chemical element that have the same atomic number and position on the periodic table and nearly identical chemical behavior, but different atomic masses and physical properties.

If two atoms have different numbers of protons, they are different elements. However, two atoms with the same number of protons and different number of neutrons are called isotopes. Two terms used to identify nuclides isotopes are atomic number and mass number.

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Approximately 10.94 grams of NaCl need to be measured out and dissolved in water to prepare a 0.25 M NaCl solution with a total volume of 750 mL.

To prepare a 0.25 M NaCl solution with a total volume of 750 mL, we need to calculate the amount of NaCl in grams that needs to be dissolved in water.

First, we need to understand the concept of molarity (M). Molarity represents the number of moles of solute (NaCl) per liter of solution. We can use the formula:

Molarity (M) = Moles of solute / Volume of solution (in liters)

We have the desired molarity (0.25 M) and the desired volume (750 mL = 0.75 L) of the solution. We can rearrange the formula to solve for the moles of solute:

Moles of solute = Molarity x Volume of solution

Moles of solute = 0.25 M x 0.75 L = 0.1875 moles

Now, we need to convert the moles of NaCl to grams. We can use the molar mass of NaCl, which is approximately 58.44 g/mol:

Grams of NaCl = Moles of NaCl x Molar mass of NaCl

Grams of NaCl = 0.1875 moles x 58.44 g/mol ≈ 10.94 grams

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Answer:

E:ammonium chloride

F:sodium hydroxide

G:ammonia

a. I2(g) => 2I(g) (volume is increased):

When the volume is increased, the system will shift towards the side with the greater number of moles of gas to decrease the pressure.

In this case, the number of moles of gas increases from 1 to 2, so the system will shift to the right. Therefore, the effect of increasing the volume is a shift to the right.

b. 2H2S(g) => 2H2(g) + S2(g) (volume is decreased):

When the volume is decreased, the system will shift towards the side with fewer moles of gas to increase the pressure. In this case, the number of moles of gas decreases from 3 to 2, so the system will shift to the left. Therefore, the effect of decreasing the volume is a shift to the left.

c. I2(g) + Cl(g) => 2ICl(g) (volume is decreased):

When the volume is decreased, the system will shift towards the side with fewer moles of gas to increase the pressure. In this case, the number of moles of gas remains the same on both sides (1 mole each), so the volume change will have no effect on the equilibrium position. Therefore, the effect of decreasing the volume is no effect on the equilibrium position.

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Answer:

74.35 g

Explanation:

The equation  of the reaction is given as;

2Al2O3 --> 4Al + 3O2

From the reaction;

2 mol of Al2O3 reacts to produce 3 mol of O2

Converting 2 mol of Al2O3 to mass;

Number of moles = Mass / Molar mass

Mass = Number of moles * Molar mass

Mass = 2 * 101.96 = 203.92 g

Converting 3 mol of O2 to volume;

1 mol = 22.4 L

3 mol = x

x = 22.4 * 3 = 67.2 L

This means 203.92g of Al2O3 produces 67.2L of O2

xg would produce 24.5 L of O2

203.92 = 67.2

x = 24.5

x = (24.5 * 203.92) / 67.2

x = 74.35 g

Answer:

Chemical reaction is a reaction in which there is a change in the chemical composition and thus new substances are formed.

The characteristics of chemical reaction are :

1. Evolution of a gas

2. Formation of a precipitate

3. Absorption or evolution of heat

4. Change in colour

Answer:

atomic, neutrons

Explanation:

the mass number of an atom is equal to the sum of the protons and neutrons in the nucleus of the atom.