Describe in a model with a caption how water can dissolve salts.
Must include:
001
molless
1. Water molecule and partial charges
2. Salt molecule and charges
3. Show interactions (attract and repel)
4. Show beginning, middle and end (undissolved, partially dissolved and fully
dissolved)
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The compound:

Can be called as Tungsten (V) hydroxide.

Answer:

26.78 kJ

Explanation:

To solve the problem, we have to first write the stoichiometric coefficients in the chemical equation:

2P + 3Cl₂ → 2PCl₃

With these coefficients, we have the same number of atoms of each chemical element on both sides: 2 atoms of P, 6 atoms of Cl.

According to the equation, 2 moles of phosphorous (P) react with 3 moles of chlorine (Cl₂), and 574 kJ of energy are released. We have to figure out which is the limiting reactant. For this, we convert the mass into moles by using the molar mass(MM):

MM(P) = 30.9 g/mol

67.04 g P/(30.9 g/mol) = 2.17 mol P

MM(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol

10.20 g Cl₂/(70.8 g/mol) = 0.14 mol Cl₂

Now, we multiply the actual moles of P (the amount we have for the reaction) by the stoichiometric ratio given by the chemical equation (3 mol Cl₂/2 mol P):

2.17 mol P x (3 mol Cl₂/2 mol P) = 3.25 mol Cl₂

To completely react 67.04 g P, we need 3.25 mol of Cl₂, and we have only 0.14 moles of Cl₂, so the limiting reactant is Cl₂.

Now, we use the limiting reactant to calculate the energy released from the reaction. The energy released per mole of Cl₂ is:

ΔH/(3 mol Cl₂) = -574 kJ/3 mol Cl₂= 191.3 kJ/mol Cl₂

Finally, we multiply the energy released per mole of Cl₂ by the number of moles of Cl₂ we have:

0.14 mol Cl₂ x 191.3 kJ/mol Cl₂ = 26.78 kJ

Answer:

c,e,f

Explanation:

Judging by what i tried to find out about this reaction, it seems that won't take place, though it could be wrong.

Answer:

4383.28 g

Explanation:

First we'll need to convert molecules into moles, we can do so using Avogadro's number:

Then we will convert 99.62 moles of carbon dioxide (CO₂) into grams, using its molar mass:

Answer:

2.27%

Explanation:

The observed value of the boiling point = 71.8°C

The actual value of the boiling point = 70.2°C

We need to find the percentage error of the student's measurement. The percentage error in any value is given by :

\(\%=\dfrac{\text{calculated value-actual value}}{\text{actual value}}\times 100\\\\=\dfrac{71.8-70.2}{70.2}\times 100\\\\=2.27\%\)

So, the required percentage error is 2.27%.

Answer:

The balanced chemical equation for the reaction of NaHCO3 and Ca(H2PO4)2 is:

2 NaHCO3(aq) + Ca(H2PO4)2(aq) → Na2HPO4(aq) + CaHPO4(aq) + 2 CO2(g) + 2 H2O(l)

From the equation, we see that 2 moles of NaHCO3 produce 2 moles of CO2. Therefore, 1 mole of NaHCO3 produces 1 mole of CO2. We can use the molar mass of NaHCO3 to convert from moles to grams.

The molar mass of NaHCO3 is:

Na: 1 x 22.99 g/mol = 22.99 g/mol

H: 1 x 1.01 g/mol = 1.01 g/mol

C: 1 x 12.01 g/mol = 12.01 g/mol

O: 3 x 16.00 g/mol = 48.00 g/mol

Total molar mass = 22.99 + 1.01 + 12.01 + 48.00 = 83.01 g/mol

One kilogram (1000 g) of baking powder contains 168 g of NaHCO3. Therefore, one kilogram of baking powder contains:

1000 g baking powder × (168 g NaHCO3 / 1000 g baking powder) = 168 g NaHCO3

To produce 2.2 L of CO2 at baking temperature, we need:

2.2 L CO2 × (1.20 g CO2 / 1 L CO2) = 2.64 g CO2

Since 1 mole of NaHCO3 produces 1 mole of CO2, we need 2.64 g of NaHCO3 to produce 2.64 g of CO2. This corresponds to:

2.64 g NaHCO3 × (1 mol NaHCO3 / 83.01 g NaHCO3) × (1 kg baking powder / 168 g NaHCO3) = 0.0198 kg baking powder

Therefore, we need 0.0198 kg, or 19.8 g, of baking powder to generate 2.2 L of CO2 at baking temperature.

Explanation:

O2 is the correct answer.

Explanation:

On a magnetic susceptibility balance, the O2 species will have the strongest mass shift since stronger paramagnetic species will have a larger mass shift.

The oxygen atoms in the O2 species are paramagnetic because unpaired electrons rotate in the same direction, increasing the magnetic field force. As a result, the oxygen atoms with two unpaired electrons will exhibit the largest mass shift on a magnetic susceptibility balance.

The magnitude of the mass shift is -O2, which increases with species paramagneticity. The mass shift increases with species paramagneticity. Therefore, on a magnetic susceptibility balance, oxygen will have the highest mass shift since it has two unpaired electrons in the molecular orbital diagram.

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Answer:

D. The kinetic energy is greater after a substance changes from a

solid to a liquid

Explanation:

During a phase change from solid to liquid, the particles making up the mobile becomes more mobile and as a result there is an increase in kinetic energy of the system.

Answer:

D. The kinetic energy is greater after a substance changes from a solid to a liquid

Explanation:

the nurse will administer approximately 1 teaspoon (tsp) of the medication.1 teaspoon (tsp) is approximately equal to 5 mL.

To determine the number of teaspoons the nurse should administer, we need to calculate the equivalent volume of 30 mEq of KCL using the provided concentration of 60 mEq/10 mL.

First, we'll find the ratio of milliequivalents (mEq) to milliliters (mL) in the given concentration:

60 mEq / 10 mL = 6 mEq/mL

Next, we can set up a proportion to find the volume (in mL) that corresponds to 30 mEq:

6 mEq/mL = 30 mEq / X mL

To solve for X, we can cross-multiply:

6X = 30 * 1

6X = 30

X = 30 / 6

X = 5 mL

Since the medication cup is marked in teaspoons, we need to convert 5 mL to teaspoons.

1 teaspoon (tsp) is approximately equal to 5 mL.

Therefore, the nurse will administer approximately 1 teaspoon (tsp) of the medication.

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Answer:

H2+Cl2--->2 HCl

Explanation:

Hydrogen +Chloride gives out 2 moles of HCl

Answer:

Fe(CH₂CO₂)₂, Fe₂MnO, Pb(CH₂CO₂)₄, PbMnO

Explanation:

Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.

1.) Fe(CH₂CO₂)₂

   ----> Fe²⁺ and 2 CH₂CO₂⁻

   ----> +2 + (-1) + (-1) = 0

2.) Fe₂MnO

   ----> 2 Fe²⁺ and 1 MnO⁴⁻
   ----> 2(+2) + (-4) = 0

3.) Pb(CH₂CO₂)₄
   ----> 1 Pb⁴⁺ and 4 CH₂CO₂⁻
   ----> +4 + (-1) + (-1) + (-1) + (-1) = 0

4.) PbMnO

   ----> 1 Pb⁴⁺ and 1 MnO⁴⁻

   ----> +4 + (-4) = 0

Answer:

Polonium > Tellurium > Selenium> Sulfur > Oxygen

Explanation:

In the periodic table, the trend of the atomic radius is; It increases down the group.

The elements when arranged in increasing atomic radius is given as;

Polonium > Tellurium > Selenium> Sulfur > Oxygen

A refrigerator delays the spoilage of food by slowing down the rate of chemical reactions within microorganisms. Therefore, option B is correct.

The term chemical reaction is defined as the processes, in which substances undergo a chemical change to formed new substances, with all new properties.

Higher temperatures often result in faster chemical reactions. When food is left on the kitchen counter, it can soon become bad. The process is slowed down by the refrigerator's lower temperature, which allows the same food to stay fresh for longer.

Bacteria, molds, and yeasts are all potential sources of microbial deterioration. Food's water activity plays a significant role in determining the type of food decomposition that results.

Thus, option B is correct.

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The molarity of the glucose solution is 8.30 mol/L.

To solve this problem, we need to use the freezing point depression equation:

ΔT = Kf * m

Where ΔT is the change in freezing point, Kf is the freezing point depression constant for the solvent (in this case, water), and m is the molality of the solute (in this case, glucose).

We know that the freezing point depression is 0 - (-10.3) = 10.3°C. The freezing point depression constant for water is 1.86 °C/m, so we can plug in these values to solve for the molality:

10.3°C = 1.86°C/m * m

m = 5.53 mol/kg

Now we need to convert molality to molarity. We know that the density of the solution is 1.50 g/ml, which means that 1 L of solution has a mass of 1500 g. Since the molar mass of glucose is 180.16 g/mol, we can calculate the number of moles of glucose in 1 L of solution:

5.53 mol/kg * 1.50 kg/L = 8.30 mol/L

Therefore, the molarity of the glucose solution is 8.30 M.

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Answer:

VOLTIC CELL

Battery

Electrical to chemical

Endothermic

Electrolysis

Chemical to electrical

Anode

Anode to cathode

Battery

Endothermic

Negative

Enthomeric

Reduction

Oxidation

ELECTRYOTIC CELL

No

Non spontaneous

positive

negative

yes

Anode

Electrical to chemical

Anode to cathode

Exothermic

positive

oxidation

Electroplating

Chemical to electrical

According to the Department of Transportation (DOT), hazardous materials are defined as materials that can pose an unreasonable risk to health, safety, or property during transportation.

These materials can include explosives, flammable gases and liquids, toxic substances, radioactive materials, and more. The DOT has specific regulations in place for the transportation of these materials to ensure that they are handled and transported safely to minimize the risk of accidents or harm.

These regulations include:

It is important to follow these regulations to prevent accidents and protect the health and safety of those involved in the transportation of hazardous materials.

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First, we need to make the exponent of 10 the same for both.

So let's transform 6.5500 x 10^5 into some number x 10^3.

For this, we need to move the dot to the right, some places where it gives the number 3. In this case, 2 places.

655.00 x 10^3

now we can sum the numbers

8.6500 x 10^3 + 655.00 x 10^3 = 663.65 x 10^3

now we need to transform this number into scientific notation. For this, must have only one number before the dot(on the left side of the dot). We will move the dot to the left, 2 places:

6.6365 x 10^5

Answer: 6.6365 x 10^5

Table salt, also known as sodium chloride, is a chemical compound that is made up of the elements sodium and chlorine. Sodium and chlorine, both of which are very reactive, combine to form a stable compound known as table salt. Sodium is a metallic element that is located in Group 1 of the periodic table, while chlorine is a nonmetallic element that is located in Group 17 or 7A of the periodic table.

Table salt is a well-known compound that has a variety of applications, including as a food seasoning, a food preservative, and an ingredient in chemical manufacturing. In addition to its taste-enhancing properties, sodium chloride is essential for maintaining proper fluid balance in the body, aiding nerve and muscle function, and transporting nutrients across cell membranes. Despite its many benefits, excessive intake of table salt can lead to high blood pressure and other health problems. To avoid this, it is recommended that people consume salt in moderation and pay attention to their sodium intake from other sources as well.

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As an electron moves from a high potential to a low potential, its electrical potential energy increases.

Electric potential energy:

Electric potential energy is the energy that is needed to move a charge against an electric field. We need more energy to move a charge further in the electric field, but also more energy to move it through a stronger electric field.

The direction of electric fields is from the region of high potential to low potential and electrons or any negatively charged particle will move against the field or lower potential to a higher potential.

Therefore when an electron moves from higher to lower potential electrical potential energy increases.

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The complete question is:

As an electron moves from a high potential to a low potential, its electrical potential energy :

a) increases

b) decreases

c) remains constant

Answer:

The answer is a compound.

it is a compound as it contains different elements

Explanation:

The answer is: Enantiomers is the stereoisomeric pair that have opposite R,S designations at all stereogenic centers.

Given below are the stereoisomeric pair with the correct relationship between their configurations:

Pair Configurations enantiomers opposite R,S designations at all stereogenic centers.

diastereomers same R,S designation for at least one stereogenic center and opposite R,S designation for at least one stereogenic center identical.

compounds identical R,S designations at all stereogenic centers

Thus, the answer is: Enantiomers is the stereoisomeric pair that have opposite R,S designations at all stereogenic centers.

Diastereomers is the stereoisomeric pair that have the same R,S designation for at least one stereogenic center and opposite R,S designation for at least one stereogenic center.

Identical compounds is the stereoisomeric pair that have identical R,S designations at all stereogenic centers.

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Answer:

It falls in Liquid and Solid.

Explanation:

In tubes 1 and 2, the starch may have been hydrolyzed into smaller units like glucose, which are reducing sugars and can react with the Benedict's reagent.

Tube 4 did not show a reaction with the Benedict's reagent because starch cannot be broken down by Benedict's reagent.

Benedict's reagent is used to test for the presence of reducing sugars, which are sugars that can donate electrons to other substances.

Starch is a polysaccharide made up of many glucose units joined together in a complex structure. The structure of starch prevents it from being able to donate electrons to Benedict's reagent, hence it does not show a reaction.

In tubes 1 and 2, the starch may have been hydrolyzed into smaller units like glucose, which are reducing sugars and can react with the Benedict's reagent.

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Area of Wedge = (Central Angle / 360°) * (π * Radius^2)

The area of the wedge, we need to calculate the central angle corresponding to the given arc length. The formula to find the central angle is:

Central Angle = (Arc Length / Circumference) * 360°

The circumference of the metal disc can be calculated using the formula:

Circumference = 2 * π * Radius

Substituting the given values, we have:

Circumference = 2 * π * 8 inches

The central angle can be calculated as:

Central Angle = (3 inches / (2 * π * 8 inches)) * 360°

Simplifying this expression gives us the central angle in degrees. Once we have the central angle, we can find the area of the wedge using the formula:

Area of Wedge = (Central Angle / 360°) * (π * Radius^2)

Substituting the values, we can calculate the area of the wedge.

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"Hypotonic solution," refers to a solution with the highest water concentration due to its lower solute concentration compared to the other options, leading to water influx into cells.

A hypotonic solution would be most likely to have the highest water concentration. In a hypotonic solution, the solute concentration is lower than that inside the cell or compared to another solution. As a result, water tends to move into the cell or the solution to equalize the concentration.

When a cell is placed in a hypotonic solution, water molecules will move into the cell through the process of osmosis. This influx of water increases the water concentration inside the cell, leading to cell swelling or even bursting in extreme cases.

Compared to hypertonic and isotonic solutions, a hypotonic solution has a lower solute concentration, allowing for a higher concentration of water molecules. This results in a higher water concentration in the solution. It's important to note that the concept of tonicity is related to the relative solute concentrations between two solutions and their effect on cell osmosis. In this case, a hypotonic solution is characterized by a higher water concentration compared to the other options.

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