Answer fast! All transition metals have _______ valence electrons.

For the encapsulation of pharmaceutical drugs or pesticides, the use of starch-borate and starch-glycerol polymers is a promising strategy that can increase their efficacy while also lowering their environmental impact.

\Starch-borate and starch-glycerol polymers are biodegradable and environmentally friendly materials that have been used for encapsulation of pharmaceutical drugs or pesticides. When drugs or pesticides are encapsulated within these polymers, it can help to improve their solubility, stability, and bioavailability, which are critical factors in their effectiveness.

The starch-borate and starch-glycerol polymers are able to form a protective coating around the drug or pesticide molecules, shielding them from external factors that may degrade or reduce their effectiveness, such as moisture, oxygen, and light. This can help to prolong their shelf-life and ensure that they remain effective for longer periods of time.

In addition, these polymers are biodegradable, meaning they can be broken down naturally in the environment without causing harm. This is beneficial as it reduces the environmental impact of these materials, compared to traditional polymers that can persist in the environment for hundreds of years. Overall, the use of starch-borate and starch-glycerol polymers for encapsulation of pharmaceutical drugs or pesticides is a promising approach that can improve their effectiveness while also reducing their environmental impact.

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Propylamine, also known as 1-aminopropane, reacts with water to form propylammonium hydroxide. The chemical equation for this reaction is: CH₃CH₂CH₂NH₂ + H₂O → CH₃CH₂CH₂NH₃⁺ + OH⁻

The condensed structural formula for propylamine is CH₃CH₂CH₂NH₂, and for water is H₂O. Propylamine is an organic compound with the molecular formula C3H9N. It is a primary amine with a propyl group attached to the nitrogen atom. Propylamine is a colorless liquid that has a strong, unpleasant odor. It is used in the production of pharmaceuticals, agrochemicals, and other chemicals.

When propylamine is added to water, it undergoes a chemical reaction in which a proton (H+) from water is transferred to the nitrogen atom of the propylamine molecule, forming a propylammonium ion CH₃CH₂CH₂NH₃⁺ and a hydroxide ion OH⁻. This reaction is an example of a base-catalyzed hydrolysis, as water acts as a base to catalyze the reaction.

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The value of Keq for this reaction is \(\bold{1.8 \times 10^-^5}\)

The correct option is (A).

Acetic acid is an organic compound also called ethanoic acid. It is a colorless liquid with a chemical formula   \((CH_3COOH)\).

It has antibacterial and antifungal properties.

When acetic acid is reacted with water, it completely dissolves in it.

Thus, the correct option is A, \(\bold{1.8 \times 10^-^5}\).

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The mole ratio tells us the simplest whole-number ratio of the atoms in the compound. Therefore, the empirical formula of the compound is:

C2H5O.

To find the empirical formula of the compound, we need to determine the simplest whole-number ratio of the atoms in the compound. We can assume that we have 100 g of the compound, and use the percentages given to find the masses of each element in those 100 g:

Mass of C = 53.31 g

Mass of H = 11.18 g

Mass of O = 35.51 g

Next, we need to convert these masses to moles, using the molar mass of each element:

Moles of C = 53.31 g / 12.01 g/mol = 4.44 mol

Moles of H = 11.18 g / 1.01 g/mol = 11.07 mol

Moles of O = 35.51 g / 16.00 g/mol = 2.22 mol

We can then divide each of the mole values by the smallest mole value to get the mole ratio:

Moles of C = 4.44 mol / 2.22 mol = 2.00 mol

Moles of H = 11.07 mol / 2.22 mol = 4.98 mol

Moles of O = 2.22 mol / 2.22 mol = 1.00 mol

The mole ratio tells us the simplest whole-number ratio of the atoms in the compound. Therefore, the empirical formula of the compound is:

C2H5O.

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Answer: A. It changes shape.

Explanation: A substance changing shape will not affect its chemical makeup.

Answer:

It can be separated by simple fractional method

Answer:

A change in the state of matter is caused if enough thermal energy is added to or removed from an object.

The chemical has a percent composition of 56.35% oxygen and 43.65% phosphorus.

A substance has an oxygen content of 88.79% and a hydrogen content of 11.19%. Calculate this compound's empirical formula. Nonetheless, it's customary to employ the atom ratio with the smallest whole number. H 2 O is the compound's empirical formula as a result.

P mass of 30.98 g and O mass of 40.00 g add up to 70.98 g.

Phosphorus: \((30.98 g / 70.98 g) x 100% = 43.65%\)

\((40 g/70.98 g) x 100% = 56.35% for oxygen.\)

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Answer:

D. tap water

keep on learning!

Answer: ethanol

Explanation: as it is a pure compound and can sometimes be a mixture while all the rest are mixtures.

A girl roller-skating has kinetic energy.

Kinetic energy is the energy of motion. It is the energy possessed by an object due to its movement. In this case, the girl roller-skating has kinetic energy because she is moving.

Potential energy is the energy an object possesses due to its position or configuration. It is the energy an object has stored within it, ready to be released. An object at rest has potential energy because it has the potential to be set in motion and does work.

So, in this case, the girl roller-skating has kinetic energy because she is moving, and not potential energy because she is not at rest.

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Answer:

9.

Explanation:

.

Answer:

●3 refer to No. of molecule

There are 3 molecule of NH4

●4 refer to atom of hydrogen

since there are 3 molecules of NH4.Each molecule containing 4 H.Therefore there are 12 H atom in the compound

Answer:

Its main advantage is they information fits on one line of text (thus works well when using the formula in paragraphs). Disadvantages are they can be confusing for larger molecules

hope this helps :3

Answer:

D. an orbital notation of the atom

Explanation:

Orbital notiation uses lines and arrows to show shells, subshells, and orbitals for electrons in an atom. Since it shows arrows being paired up in this diagram it would be the best model for Chuck to use.

On Edgenuity2020, the answer is D) an orbital notation of the atom

Answer:

the different things that we have and animals are.:

Answer:  " \(1.41 * 10^{24}\) " atoms of aluminum (Al) .

____________________________________

Explanation:

_________________________

Using a technique called "dimensional analysis" ; as follows:

________________________

→  " \(\frac{2.34 mol Al}{1} * \frac{6.022*10^{23}atoms Al}{1 mol Al} = ?\)  

________________________

The units "mol Al" ["moles of aluminum"] cancel out; and we have:

________________________

→  "\([(2.34) * (6.022 * 10^{23})] = ?\) atoms of Al [aluminum].

________________________

Note that by definition: 1 (one) "mole" (abbreviated "mol") of anything consists of " \(6.022*10^{23}\) " units " of that particular thing.

 This number:  6.022*10^{23} —is known as:  "Avogadro's number".

________________________

→  [ 2.34 * 6.022 * 10^23] ;

     = 1.409148 * 10^24 ;

                → Round to 3 (Three) significant figures;

                →  since: "2.34" has 3 (Three) significant figures;

                  →  to get: " \(1.41 *10^{24}\)  atoms of aluminum (Al).

________________________

Hope this is helpful to you!  Wishing you the best!

________________________

The volume of propane gas occupied in the Erlenmeyer flask before the addition of any water was 314.0 ml.

A laboratory flask with a flat bottom, a conical body, and a cylindrical neck is known as an Erlenmeyer flask, sometimes known as a conical flask or a titration flask. It was developed in 1860 by German scientist Emil Erlenmeyer (1825–1909), for whom it is called. 

Erlenmeyer flasks feature broad bases and narrow, vertical necks at their uppermost points.

They might be graduated, and places, where they can be marked with a pencil, are frequently covered in patches of ground glass or enamel. Its short neck and tapering body set it apart from the beaker. They come in a variety of volumes and can be made out of glass or plastic, depending on the application.

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(I know this is late so hopefully other people find it helpful)

Answer: Solid Cu  

Since this is a voltaic cell:

Copper is the cathode, therefore having a positive charge.

Zinc is the anode, therefore having a negative charge.

(Also, I took the exam and it's correct; good luck everyone!)

During exercise, hemoglobin (Hb) has a lower affinity to oxygen (O₂) and can more easily release O₂ to the tissues.

When we exercise, our muscles need more oxygen to produce energy. As a result, hemoglobin's affinity for oxygen decreases, allowing it to release oxygen more easily to the tissues that need it. This process is known as the Bohr effect and is an important part of the body's response to exercise.
So, in short, during exercise, Hb has a lower affinity to O₂ and can more easily release O₂ to the tissues.

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Answer:  This area is known as the intertropical convergence zone

Explanation: i think this is it

Answer:

Terrible human being!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Explanation:

Answer:

An inorganic peroxide consisting of two hydroxy groups joined by a covalent oxygen-oxygen single bond. Hydrogen peroxide is a chemical compound with the formula H2O2.

The limitation of using this simulation to study and understand the behavior of light through a convex lens is:

The simulation may not accurately represent the real-world behavior of light through a convex lens because the measurements of the rays can be influenced by the size of the screen or display used for the simulation.

The scaling and proportions on the screen may affect the accuracy of the simulation, potentially leading to discrepancies in the behavior of the light rays compared to their actual behavior in physical experiments or observations.

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Iodine is less reactive

Answer: Iodine is less reactive in comparison to Lithium

Answer:; 66 g is about 3/2 the value of the molar mass of CO2. It is reasonable that the sample contains 3/2 (1.5) mol.

Explanation:

Approximately 12,083.33 mL of the water sample contains 145 mg of Pb.

To calculate the amount of water (in mL) that contains 145 mg of Pb, we need to use the given information that the water sample contains 0.0012% Pb by mass.

First, we need to find the mass of the entire water sample. Let's assume the mass of the water sample is 1 gram (1000 mg) for ease of calculation.

Since the water sample contains 0.0012% Pb by mass, we can calculate the mass of Pb in the water sample by multiplying the mass of the water sample by 0.0012%.

Mass of Pb = 0.0012% x 1000 mg = 0.012 mg

Next, we can set up a proportion to find the volume of water (in mL) that contains 145 mg of Pb:

Mass of Pb / Volume of water = Mass of Pb in the given water sample / Volume of the given water sample

145 mg / x mL = 0.012 mg / 1 mL

Cross-multiplying, we get:

145 mg x 1 mL = 0.012 mg x x mL

145 = 0.012x

Solving for x:

x = 145 / 0.012

x ≈ 12,083.33 mL

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Chlorine in group 17 in the periodic table and includes halogens (also fluorine, bromine, and iodine)

Electron configuration of Cl : [Ne] 3s² 3p⁵

From this configuration, it can be seen that to obtain stability like the noble gas Ar - [Ne] 3s² 3p⁶, Chlorine will need one more electron so that its configuration is the same as Ar( become anion-Cl⁻)

Then it is said that Cl is reactive

And the Cl element is included in the non-metal group because it attracts electrons (electronegative)

The elements that include non-metals are halogens, noble gases, and 7 elements H, C, N, O, P, S, Se.

Answer:

The Lydia Bourouiba is recorded is around more than the 100 sneezes and coughs cases.

Explanation:

Lydia Bouroubia was a mathematical physicist who does experiments on sneezes and coughs. She was a leading expert in coughs and sneezes. Sneezing is a phenomenal activity that occurs in our body to excrete the dust particles and germs.

The disease also spread through it. Lydia thought that her research will help people related to their health. It will help in stopping epidemics in public. It is a type of outbreak of disease at a bigger level in the public.

1. Based on the stoichiometry of the reaction:

a. The number of moles of iron oxide that would be formed with 1.82 moles of oxygen is 1.213 moles.

b) The number of moles of Fe that are needed to react with 0.5 moles O₂ is 0.66 moles.

c) The number of moles of Fe that are needed to produce 2.77 g of Fe₂O₃ is 0.0346 moles.

2. Based on the stoichiometry of the reaction:

a) When 1.76 moles of Potassium chlorate are reacted, the number of moles of O₂ that will be formed is 2.64 moles

b) The number of moles of O₂ that are produced from 4.17 moles of KCIO₃ is 6.255 moles.

The moles of products that are formed are derived from the mole ratio as given in the equation of the reaction.

1.  Equation of reaction: 4 Fe +  3 O₂ --> 2 Fe₂O₃

The number of moles of iron oxide formed = 1.82 * 2/3

The number of moles of iron oxide formed = 1.213 moles.

b) The number of moles of Fe that are needed to react with 0.5 moles O₂ = 0.5 * 4/3

The number of moles of Fe that are needed =  0.66 moles.

c) The number of moles of Fe that are needed to produce 2.77 g of Fe₂O₃ will be

Molar mass of Fe₂O₃ = 160 g/mol

The number of moles of Fe that are needed = 2.77/169 * 4/2

The number of moles of Fe that are needed = 0.0346 moles.

2. KCIO₃  ---> 2 KCI + 3 O₂

a. the number of moles of O₂ that will be formed = 1.76 * 3/2

the number of moles of O₂ that will be formed = 2.64 moles

b) The number of moles of O₂ produced =  4.17 * 3/2

The number of moles of O₂ produced = 6.255 moles.

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