FILL IN THE BLANK in each of these examples, the chemical substance is secreted from a cell and delivered to another cell by way of ____________ .

Answer:

Sea turtle

Is the animal in the image

During the process of recrystallization of acetanilide, the color of the compound changes from white or off-white to a pure and brighter white. This change in color is indicative of the success of the purification process, as the impurities that were present in the initial sample have been removed.

The appearance of the crystals can also provide an indication of the success of the purification process. Pure acetanilide crystals are typically well-formed, clear, and have a defined shape, while impure crystals may appear cloudy or irregular in shape.

While appearance can provide some indication of purity, it is not always reliable. A more accurate method for testing purity is to perform a melting point determination. The melting point of pure acetanilide is around 113-115°C, so if the melting point of the crystals obtained through recrystallization is within this range, it can be assumed that the purification process was successful. However, if the melting point is lower or higher, this may indicate the presence of impurities in the sample.

Overall, while the appearance of the crystals can provide some indication of purity, it is important to use additional methods such as melting point determination to confirm the success of the purification process.

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The color of phenolphthalein indicator in a solution of hydrochloric acid will be colorless.

Phenolphthalein is a weak acid that changes color over a pH range of 8.2 to 10.0, going from colorless to pink as the pH increases. In a solution of hydrochloric acid, the pH is less than 8.2, so the phenolphthalein will not be pink, but will remain colorless. This indicates that the solution is acidic, with a pH lower than 8.2.

Phenolphthalein is often used in laboratory experiments, especially in the field of chemistry, to determine the endpoint of titrations and to monitor the pH changes during a reaction.

The color change of phenolphthalein occurs because the pink form of the indicator is a weak base and the colorless form is a weak acid. In an acidic solution, phenolphthalein will exist in its colorless, acidic form, and in a basic solution, it will exist in its pink, basic form. The exact pH range over which the color change occurs depends on the concentration of the phenolphthalein solution, but it is typically between 8.2 and 10.0.

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Answer:

Nonpolar

Explanation:

Well, \(SiBr_4\) or better known as silicon tetrabromide,  is considered nonpolar.

To start,

Polar covalent bonds are a common component of polar molecules, which are covalent chemical compounds. Due to an uneven distribution of bonding valence electrons caused by varying electronegativity values in the connecting atoms, these bonds have partial charge separation. A dipole moment that is directed in a certain direction is represented by each polar covalent link. According to VSEPR theory, the complex itself has a certain molecular geometry at the center atom. Because of this geometry and the polar covalent bonds, the compound itself may occasionally exhibit a net dipole moment.

To put this simply,

Because bromine is more electronegative than silicon, each covalent link between Si and Br is polar. The shape of the molecule, however, prevents it from being polar. In other words, its geometry.

Here is some information of the SiBr4 Lewis Structure, Geometry, Hybridization, and Polarity.

Tetrabromosilane, often known as silicon tetrabromide, is an inorganic molecule in which one Si atom and four Br atoms are covalently connected. It is produced using silicon and bromine vapors at temperatures over 600 °C. SiBr4 is a colorless liquid with an extremely oppressive smell. Its capacity to hydrolyze and emit HBr gas, which has an unpleasant odor, as demonstrated in the equation, is the reason of this distinctive stench.

SiBr4  +  2H2O  →  SiO2  +  4 HBr

Thanks.

The atomic number of rubidium is 37, it means that its electron configuration is as follows:

Rubidium is an alkali metal. Its ion is formed when it loses an electron. It means that the rubidium ion has 36 electrons instead of 37, and its configuration is as follows:

Answer:

S + HNO3 = H2SO4 + NO2 + H2O

Explanation:

Answer:

Based on stoichiometry HNO3 to H2O is 6:2

Use 9 grams to find the moles of HNO3

9 grams/63g/mol=0.143 moles of HNO3

HNO3:H2O

6:2

0.143*2/6=0.048

H2O moles is 0.048moles

Mass of water =0.048moles*18g/mol=0.864g

To the nearest tenth=0.9grams

Explanation:

I think this is right

The following single displacement reaction can be written as,

Mg + CuSO4 (aq.) ----> Cu (s) + MgSO4 (aq.)

F2 + 2KBr ----> 2KF + (aq.) + Br2 (aq.).

Single displacement reaction is defined as a reaction in which one element is substituted for another element in a compound. The starting materials in the reaction are always pure elements. It is a type of reaction in which one element replaces a similar element in a compound. The general form of single-displacement reaction can be expressed as,

                     A+BC→AC+B

Mg + CuSO4 (aq.) ----> Cu (s) + MgSO4 (aq.)

F2 + 2KBr ----> 2KF + (aq.) + Br2 (aq.).

This reaction above is called as an oxidation-reduction or redox reaction:

Single displacement reaction is also called as single- replacement reaction. This involves a reaction in which one element is substituted for another element in a compound.

We can predict a single-displacement reaction if a reaction is characterized by one cation or anion trading places with another to form a new product. It is not difficult to predict when one of the reactants is an element and the other is a compound.

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The correct question is,

Write the reactions and predict the products of each of the following single replacement reactions. balance all reactions. if no reaction occurs write n. r.

Mg + CuSO4 (aq.) ---->

F2 + 2KBr ---->

When the proton number and electron number are unequal, the atom or molecule is an ion.

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The amount of water that should be added to 28 ml of 15​% alcohol solution to reduce the concentration to ​14% is: 2 ml

To solve this problem, the formula and the procedure that we have to use is:

c1 * v1 = c2 * v2

Where:

Information about the problem:

Applying the dissolution of concentrations formula and clearing the volume of the diluted solution (v2) we get:

c1 * v1 = c2 * v2

v2 = (c1 * v1)/ c2

v2 = (15% * 28 ml)/ 14%

v2= 30 ml

In order to know how much water should be added we have to subtract 28 ml from the volume of the diluted solution:

amount of water should be added = v2 - v1

amount of water should be added = 30 ml - 28 ml

amount of water should be added = 2 ml

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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3\(Sr^{2+}\)(aq) +    6Cl- (aq) + 6Na+ (aq) +  2PO43-(aq) → Sr3(PO4)2(s)  +   6Na+ (aq) + 6Cl- (aq) is the balanced net ionic equation for the reaction when strontium chloride and sodium phosphate are mixed in aqueous solution.

When the general reaction equation of any reaction is represented by dissociating its ions is know as ionic equation.

Strontium chloride and sodium phosphate are mixed in aqueous solution to react.

To find:

The balanced net ionic equation for the given statement.

So,

first the general reaction equation for the given Statement is given below

3SrCl2 (aq)   + 2Na3PO4(aq) → Sr3(PO4)2(s)    + 6 NaCl(aq)

Now, we dissociate the ions to get the ionic equation for the same given reaction for the statement provided above:

So the net ionic equation for the same is :

3\(Sr^{2+}\)(aq) +  6Cl- (aq) + 6Na+ (aq) +  2PO43-(aq) → Sr3(PO4)2(s)  + 6Na+ (aq) + 6Cl- (aq)

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A crystalline solid that is greenish or yellow-brown in color is ferrous sulfate. 15.0 lb/gal for density. at 64 °C it melts and at 90 °C it loses the seven fluids of hydration.

Thus, The threat to the environment is the main risk. To prevent it from spreading to the environment, action needs to be taken right away. used as a fertilizer element and for the treatment of sewage or water and density.

The prevalence of iron deficiency anemia is a major global public health issue, particularly in young children, babies, and pregnant women and hydration.

This kind of anemia develops when the development of erythrocytes, or red blood cells, is not sufficiently supported by iron intake, iron reserves, and iron loss. A synthetic substance used to treat iron deficiency is ferrous sulfate.

Thus, A crystalline solid that is greenish or yellow-brown in color is ferrous sulfate. 15.0 lb/gal for density. at 64 °C it melts and at 90 °C it loses the seven fluids of hydration.

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Answer:

iron-56

Explanation:

Iron-56 (56Fe) is the most common isotope of iron. About 91.754% of all iron is iron-56. Of all nuclides, iron-56 has the lowest mass per nucleon.

Answer:

Iron-56

Explanation:

Iron-56 (56Fe) is the most common isotope of iron. About 91.754% of all iron is iron-56. Of all nuclides, iron-56 has the lowest mass per nucleon. With 8.8 MeV binding energy per nucleon, iron-56 is one of the most tightly bound nuclei.

Answer:

The correct statement is;

(B) Only II

Explanation:

I) The atomic mass unit or amu which is also known as daltons which is defined as 1/12 × the mass of a carbon-12 atom, which is therefore, 1.660538921 × ⁻²⁴ grams

Therefore, the mass of 1 atom of carbon-12 = 12 amu

II) The mass of one mole of oxygen-16 is 16 grams while the mass of one mole of carbon-12 is 12 grams

The mass of 4 atoms of carbon 12 = 4 × 12 amu = 48 amu

The mass of 1 atom of oxygen-16 = 15.99491461956 amu

Therefore, the mass of 3 atoms of oxygen-16 = 3 × 15.99491461956 = 47.9847438587 amu ≈ 48 amu

Therefore only II is correct.

k = -1/(slope of plot) is the correct answer to identify the rate constant k for the reaction based on the information in the plot of ln[H2O2] versus time (t).

Therefore, the rate constant can be determined by finding the slope of the plot and then using the formula k = -1/(slope of plot)

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Answer:

higher data rates are

Explanation:

transmitted

as the bandwidth

is more

more antenna gain is possible

If the force is applied to lift the box, then there is no work done as the displacement of the box is not in the same direction of the box.

However, if the force is being applied to move the box in the direction of the force, then the work done is:

Work = force x distance

Work = 1500 x 3

Work = 4,500 Joules

A forklift applies a force of 2,000 N to raise a box 3 m. The work is done by the forklift in raising the box is 6000 Joules.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity, since it has both magnitude and direction.

Isaac Newton's three laws of motion, which are outlined in his Principia Mathematica, are frequently used to illustrate the concept of force (1687).

Contact forces and act at a distance forces are the two different types of forces. Your daily use of force is evident. Basically, push and pull are forces. You exert force on an object when you push against it or pull against it.

The force is applied to move the box in the direction of the force,

Then the work done is

Work = force x distance

Work = 2000 x 3

Work = 6000 Joules.

Thus, A forklift applies a force of 2,000 N to raise a box 3 m. The work is done by the forklift in raising the box is 6000 Joules.

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Explanation:

Answer:

Properties of Salt

☆Crystals or white crystalline powder.

☆Transparent and colourless in crystalline form – rather like ice.

☆Crystallises in the isometric system, usually in the form of cubes.

☆Soluble in water (35.6g/100g at 0°C and 39.2g/100g at 100°).

Explanation:

please mark me brainliest please

Answer:As the ball is at 70 degree celsius and the water is at 30 degree celsius, the heat flow will take place from the hot metal ball towards the water which is at low temperature.

Explanation:

Therefore,  there will be a decrease in the temperature of the metal ball.

Answer:

1. summer 2 spring 3 winter 4 fall/autumn

The answer is 67 108.0888km/s.

Answer

1. The name of the first structure is c1hloromethan and has a tTetrahedra geometry..

2. The name of the second structure is ammonium ion and has a tetrahedral geometry.

3. The name of the third structure is sulfur hexafluoride anion and has an octahedral geometry.

Answer:

as mass and the square of speed is directly proportional to the the kinetic enegry so, more there will be mass and speed there will be more kinetic enegry.

If density of gold is 19.3g/cm3 amd mass is 5.23 g, then volume obtained is 0.27cm3.

Density is defined as how much a matter is packed in given area. It is represented by ρ.

ρ = m/ V

Given,

density of gold = 19.3 g/cm3

mass of gold = 5.23 g

As we know that,

density = mass/ volume

mass = density× volume

19.3 = 5.23 / volume

volume = 5.23/19.3

volume = 0.27 cm3.

Thus, if density and mass is given volume can be obtained.

Volume of gold is given as 0.27 cm3.

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a) Amount of H₂SO₄ = 0.00500 moles.

b) H₂SO₄ + Mg(OH)₂ → MgSO₄ + 2H₂O

c) Amount of excess acid = 0.001180 moles of H₂SO₄

d) The amount of H₂SO₄ that reacted with Mg(OH)₂ is also 0.001180 moles.

e) Amount of Mg(OH)₂ = 0.02126 moles

f) The percentage by mass of magnesium hydroxide in the 1.24 g antacid tablet = 100.5%

g) Repeating quantitative measurements are important to ensure that the results are accurate and precise.

(a) To calculate the amount of sulfuric acid (H₂SO₄) in moles, we'll use the formula:

Amount (in mol) = concentration (in moldm^−3) × volume (in dm^3)

Given that the concentration of sulfuric acid is 0.100 moldm^−3 and the volume is 50.00 cm^3 (which is equivalent to 0.05000 dm^3), we can calculate the amount of sulfuric acid:

Amount = 0.100 moldm^−3 × 0.05000 dm^3

Amount = 0.00500 moles of H₂SO₄

(b) The balanced chemical equation for the reaction of sulfuric acid (H₂SO₄) with magnesium hydroxide (Mg(OH)₂) is:

H₂SO₄ + Mg(OH)₂ → MgSO₄ + 2H₂O

(c) To calculate the amount of excess acid present, we need to determine the amount of sodium hydroxide (NaOH) used to neutralize the excess sulfuric acid. The balanced equation for this reaction is:

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

Given that the concentration of sodium hydroxide is 0.1133 moldm^−3 and the volume used is 20.80 cm^3 (which is equivalent to 0.02080 dm^3), we can calculate the amount of sodium hydroxide used:

Amount of NaOH = 0.1133 moldm^−3 × 0.02080 dm^3

Amount of NaOH = 0.002360 moles of NaOH

Since the balanced equation shows that 2 moles of NaOH react with 1 mole of H₂SO₄, we can calculate the amount of excess acid:

Amount of excess acid = 0.002360 moles of NaOH ÷ 2

Amount of excess acid = 0.001180 moles of H₂SO₄

(d) From the balanced chemical equation in part (b), we can see that 1 mole of magnesium hydroxide (Mg(OH)₂) reacts with 1 mole of sulfuric acid (H₂SO₄). Therefore, the amount of H₂SO₄ that reacted with Mg(OH)₂ is also 0.001180 moles.

(e) To determine the mass of Mg(OH)₂ in the antacid tablet, we need to use the molar mass of Mg(OH)₂. The molar mass of Mg(OH)₂ is:

Mg: 24.31 g/mol

O: 16.00 g/mol (2 atoms)

H: 1.01 g/mol (2 atoms)

Molar mass of Mg(OH)₂ = 24.31 + (16.00 × 2) + (1.01 × 2)

Molar mass of Mg(OH)₂ = 58.33 g/mol

The amount of Mg(OH)₂ can be calculated using the following formula:

Amount (in mol) = mass (in g) ÷ molar mass (in g/mol)

Given that the mass of the antacid tablet is 1.24 g, we can calculate the amount of Mg(OH)₂:

Amount = 1.24 g ÷ 58.33 g/mol

Amount = 0.02126 moles of Mg(OH)₂

(f) The percentage by mass of magnesium hydroxide (Mg(OH)₂) in the antacid tablet can be calculated using the following formula:

Percentage by mass = (mass of Mg(OH)₂ / mass of antacid tablet) × 100

Given that the mass of Mg(OH)₂ is 0.02126 moles (as calculated in part (c)) and the mass of the antacid tablet is 1.24 g, we can calculate the percentage:

Percentage by mass = (0.02126 mol × 58.33 g/mol / 1.24 g) × 100

Percentage by mass = 100.5% (rounded to three significant figures)

(g) Repeating quantitative measurements is important for several reasons:

1. Accuracy: Repeating measurements allows for the detection and reduction of errors. By taking multiple measurements, any random errors or anomalies can be identified and averaged out, leading to a more accurate result.

2. Precision: Repeating measurements helps assess the precision or consistency of the experimental technique. If repeated measurements yield similar results, it indicates a higher level of precision.

3. Reliability: Repeating measurements improves the reliability of the data. It helps confirm the validity of the observed trends, relationships, or conclusions drawn from the data.

4. Statistical analysis: Repeating measurements allows for the application of statistical analysis to determine measures of central tendency (e.g., mean) and variability (e.g., standard deviation), providing a more robust analysis of the data.

5. Error estimation: Repeating measurements aids in error estimation and determining the uncertainty associated with the experimental results. This information is crucial for evaluating the significance of the findings and comparing them with theoretical expectations or previous studies.

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The major factors influencing fusion consist of the required high temperature and high pressure which is not shown in the model and hence becomes one of its limitations.

Two major requirements for fusion are:

1) The energy from the high temperature allows the hydrogen atoms to overcome the electrical attraction between the protons. Temperatures of roughly 100 million Kelvin are necessary for fusion. Hydrogen is not a gas at these temperatures; it is a plasma. The high-energy state of matter known as plasma is one in which all atoms have had their electrons removed and are now free to move about. The sun's massive mass and the compression of that mass in the core caused by gravity allow it to reach these temperatures.

2) The hydrogen atoms are compressed together by high pressure. For Fusion, they need to be within 1x10-15 meters of one another. The sun compresses hydrogen atoms together in its core using gravity and its bulk. We must use strong magnetic fields, potent lasers, and ion beams to force hydrogen atoms together.

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To synthesize 1-bromo-3-chlorobenzene starting from benzene, a multi-step process would be required. This process would involve several reactions to introduce the bromo and chloro groups onto the benzene ring.

The first step would be to introduce a nitro group onto the benzene ring via nitration using a mixture of concentrated nitric acid and sulfuric acid. The nitro group would then be reduced to an amino group using a reducing agent such as iron and hydrochloric acid.

Next, the amino group would be diazotized using sodium nitrite and hydrochloric acid to form a diazonium salt. This diazonium salt would then be coupled with cuprous chloride to form a chlorobenzene ring.

Finally, the chlorobenzene would be further reacted with sodium bromide and hydrobromic acid to replace the chlorine atom with a bromine atom, forming 1-bromo-3-chlorobenzene. Overall, this synthesis would require several steps and careful control of reaction conditions to ensure high yields and purity of the desired product.

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To answer this question we have to use the rule of dilutions:

Where V1 is the initial volume, C1 is the initial concentration, V2 is the final volume and C2 is the final concentration. In this case we need to find V1.

Solve the equation for V1 and replace C1 for 4.00M, V2 for 665mL and C2 for 0.350M

It means that the volume required is 58.2mL.