1. Draw the basic repeating unit of sodium alginate polymer. 2. What is this polymer used for?

Answer:

False

Explanation:

Chemical changes do change the composition of the substance. However, physical changes do not; physical changes simply alter the physical form of the substance.

For example, a melting ice cube is undergoing a physical change, but its overall composition of H2O isn't changing. It's just changing from a solid form to a liquid form.

Hope this helps!

Answer:

false

Explanation:

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.

Answer:

spring tide

Explanation:

when both the sun and moon aligned th affect of each is added together producing higher than normal tides called SPRING TIDES

Answer:

Spring Tide

Explanation:

In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides.

Answer:

an initial velocity that is faster than the final velocity

Explanation:

please like and Mark as brainliest

Answer:

C

Explanation:

Answer:

c

Explanation:

all of the friction from the fan blades and the fan inside has stopped the fan from spinning and friction is heat.

If the electricity is cut off, the fan blades will slow down and further eventually stop spinning in case of all the kinetic energy of the fan blades has been turned into heat energy. The correct option is C.

In physics, an object's kinetic energy is the energy it has basically as a consequence of its motion.

It is described to as the amount of work required to accelerate a body of a given mass from initial state to a given velocity.

The body usually regains its kinetic energy after gaining it during acceleration unless its speed changes.

Kinetic energy is the energy that an object has as a consequence of its movement. The ability of kinetic energy to do work is perhaps its most crucial mandatory property.

Work is renowned as force acting in the direction of motion on an object. Work as well as energy are so inextricably interlinked that they can be utilized even interchangeably.

Thus, the correct option is A.

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Answer:

negative, positive, increase

Explanation:

From the given question,  

During the formation of bond, between two atoms with difference between their electronegativity-

And,

Atoms with different electronegativities share electrons unequally, leading to partial charges. The more electronegative atom gains a partial negative charge, while the other has a partial positive charge. Larger electronegativity differences intensify these charges.

When two atoms with different electronegativities form a covalent bond, the atom with higher electronegativity will attract shared electrons more and will have a partial negative charge. Conversely, the atom with lower electronegativity will have an equal and opposite partial positive charge. As the difference in electronegativity increases, the resulting magnitudes of the partial charges will also increase.

Answer:

Explanation:

D. The transfer of thermal energy to the ice cube causes its molecules to move faster.

Answer:

its A heat causes the molecules in the cube to expand and forces them apart.

Explanation:

Answer:

1.Ca atom has greater radius than Ca+2

2.F- ion has larger radius than F

1. The Ca+2 ion has a smaller radius than the Ca atom. 2. The F- ion has a larger radius than the F atom. 3. The trend for ionic radius vs. atomic radius is that ions are generally smaller than their corresponding atoms.

1. The Ca+2 ion has a smaller radius than the Ca atom. When an atom loses electrons to become a cation, it loses its outermost electrons, resulting in a decrease in the size of its electron cloud and thus a smaller radius.

2. The F- ion has a larger radius than the F atom. When an atom gains electrons to become an anion, it adds electrons to its outermost energy level, resulting in an increase in the size of its electron cloud and thus a larger radius.

3. The trend for ionic radius vs. atomic radius is that ions are generally smaller than their corresponding atoms. Cations are smaller than their parent atoms because they have lost electrons, which reduces the electron cloud and decreases the size. Anions are larger than their parent atoms because they have gained electrons, which increases the electron cloud and increases the size.

Answer:

The answer is I think None.

Answer : The pre-exponential factor in the Arrhenius equation is, 14.99  s⁻¹

Explanation :

Using Arrhenius equation,

[tex]K=A\times e^{\frac{-Ea}{RT}}[/tex]

Taking ln on both the sides, we get:

[tex]\ln K=\frac{-Ea}{RT}+\ln A[/tex]

where,

K = rate constant = [tex]15.0s^{-1}[/tex]

Ea = activation energy = 1.104 J/mol

T = temperature = 300 K

R = gas constant = 8.314 J/mole.K

A = Arrhenius constant

Now put all the given values in the above formula, we get the value of \ln a.

[tex]\ln (15.0s^{-1})=\frac{1.104J/mol}{(8.314J/mole.K)\times (300K)}+\ln A[/tex]

[tex]\ln A=2.708s^{-1}[/tex]

[tex]A=14.99s^{-1}[/tex]

Therefore, the pre-exponential factor in the Arrhenius equation is, 14.99  s⁻¹

Answer:

The specific heat capacity of a substance is the heat capacity of a sample of the substance divided by the mass of the sample. Informally, it is the amount of energy that must be added, in the form of heat, to one unit of mass of the substance in order to cause an increase of one unit in its temperature.

Explanation:

More explanation...

The ratio of the heat energy absorbed by a substance to its increase in temperature. Heat capacity is also called thermal capacity. The specific heat or specific heat capacity of a substance is the heat capacity per unit mass, usually measured in joules per kilogram per degree Kelvin.

- Without the statements, I will not be able to give an exact answer. Hope this helps!

Answer:

D) the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure

Explanation:

on edg

Answer:

It will have expanded

Explanation:

Answer:

It will have expanded

Explanation:

Answer:Eat a light dinner and avoid foods that trigger your heartburn. Don't lie down for at least 2 to 3 hours after you eat. Use blocks or books to raise the head of your bed by 4-6 inches. Or put a foam wedge under your mattress at the head of the bed.

Explanation:

Answer:

CACO3 is a precipitate. answer C definitely.

The chemical reaction that will produce a precipitate is:

C. [tex]Na_2CO_3+CaCl_2----- > CaCO_3+2NaCl[/tex]

Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.

Thus, out of the given options the option c will form a precipitate when sodium carbonate reacts with calcium chloride, calcium carbonate will form with a salt sodium chloride.

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Answer:

Sodium chloride (NaCl)

Explanation:

According to Arrhenius, an acid is a substance that dissociates to give protons, whereas a base dissociates to give hydroxide ions in an aqueous solution.

Therefore, a chemical reaction in which an Arrhenius acid reacts with an Arrhenius base to give salt and water, is known as a Neutralization reaction.

For example: Neutralization reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH)

A strong acid, hydrochloric acid (HCl) reacts with a strong base, sodium hydroxide (NaOH) to give salt, sodium chloride (NaCl) and water (H₂O).

The chemical equation for this Neutralization reaction:

HCl (acid) + NaOH (Base) → NaCl (Salt) + H₂O (Water)

Therefore, sodium chloride (NaCl) is the salt formed during the chemical reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH).

Answer:

A lake because it has more mass

Answer:

A lake at 10 degrees C

Explanation: Got it right on Edge 2020

Answer:

D. none of the above

Explanation:

A. is wrong because pressure and volume have an inverse relationship. When one increases the other decreases, this is not an option.

B. is wrong because temperature and volume have a proportional relationship. One one goes up, the other goes up or vice versa.

C. is wrong because volume cannot increase the then decrease at the same time.

Answer:

1) The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].

2) The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].

3)The given statement is false.

Explanation:

1)

Solubility of lead chloride = [tex]S=3.1\times 10^-2M[/tex]

[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]

                            S     2S

The solubility product of the lead(II) chloride = [tex]K_{sp}[/tex]

[tex]K_{sp}=[Pb^{2+}][Cl^-]^2[/tex]

[tex]K_{sp}=S\times (2S)^2=4S^3=4\times (3.1\times 10^{-2})^3=1.2\times 10^{-4}[/tex]

The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].

2)

Concentration of aluminium nitrate = 0.000010 M

Concentration of aluminum ion =[tex]1\timed 0.000010 M=0.000010 M[/tex]

Solubility of aluminium hydroxide in aluminum nitrate solution = [tex]S[/tex]

[tex]Al(OH)_3(aq)\rightleftharpoons Al^{3+}(aq)+3OH^-(aq)[/tex]

                            S     3S

The solubility product of the aluminium nitrate = [tex]K_{sp}=1.0\times 10^{-33}[/tex]

[tex]K_{sp}=[Al^{3+}][OH^-]^3[/tex]

[tex]1.0\times 10^{-33}=(0.000010+S)\times (3S)^3[/tex]

[tex]S=1.6\times 10^{-10} M[/tex]

The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].

3.

[tex]Molarity=\frac{Moles}{Volume (L)}[/tex]

Mass of NaCl= 3.5 mg = 0.0035 g

1 mg = 0.001 g

Moles of NaCl = [tex]\frac{0.0035 g}{58.5 g/mol}=6.0\times 10^{-5} mol[/tex]

Volume of the solution = 0.250 L

[tex][NaCl]=\frac{6.0\times 10^{-5} mol}{0.250 L}=0.00024 M[/tex]

1 mole of NaCl gives 1 mole of sodium ion and 1 mole of chloride ions.

[tex][Cl^-]=[NaCl]=0.00024 M[/tex]

Moles of lead (II) nitrate = n

Volume of the solution = 0.250 L

Molarity lead(II) nitrate = 0.12 M

[tex]n=0.12 M]\times 0.250 L=0.030 mol[/tex]

1 mole of lead nitrate gives 1 mole of lead (II) ion and 2 moles of nitrate ions.

[tex][Pb^{2+}]=[Pb(NO_2)_3]=0.030 M[/tex]

[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]

Solubility of lead(II) chloride = [tex]K_{sp}=1.2\times 10^{-4}[/tex]

Ionic product of the lead chloride in solution :

[tex]Q_i=[Pb^{2+}][Cl^-]^2=0.030 M\times (0.00024 M)^2=1.7\times 10^{-9}[/tex]

[tex]Q_i<K_{sp}[/tex] ( no precipitation)

The given statement is false.

The Ksp of PbCl2 at a given temperature is calculated using the solubility of the compound. For Al(OH)3 in a solution containing Al(NO3)3, the solubility would be influenced by the common ion effect. The potential formation of a PbCl2 precipitate depends on the concentrations of lead(II) and chloride ions.

Calculation of Ksp and Solubility

The solubility product (Ksp) represents the equilibrium between a solid and its corresponding ions in a solution. It is a unique value for each soluble compound at a given temperature.

1. Ksp of PbCl2

The dissolution of PbCl2 can be written as:

PbCl2(s) ⇌ Pb2+(aq) + 2Cl-(aq)

Given the solubility of PbCl2 is 3.1 x 10-2 M, we can deduce the concentration of Pb2+ is 3.1 x 10-2 M and Cl- is 2 x 3.1 x 10-2 M. Thus, the Ksp can be calculated using the formula:

Ksp = [Pb2+][Cl-]2 = (3.1 x 10-2) x (2 x 3.1 x 10-2)2 =  5.88 x 10-5

2. Solubility of Al(OH)3 in Al(NO3)3 Solution

Given the Ksp of Al(OH)3 is 1.0 x 10-33, and the initial concentration of Al3+ from Al(NO3)3 is known, we need to account for the common ion effect which will reduce the solubility of Al(OH)3. This complex calculation would require additional steps to accurately account for the common ion.

3. Formation of PbCl2 Precipitate

NaCl dissociates to give Cl- ions and the Pb2+ from Pb(NO3)2 can form PbCl2, depending on the product of their concentrations relative to the Ksp of PbCl2. This assessment involves comparing the ionic product to the Ksp to determine if a precipitate will form.

Answer:5.3mol

Explanation:

Answer:

Castings

Explanation:

Worm castings contain concentrated nitrates, calcium, etc.

Answer:

Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.

Explanation:

Each hemoglobin molecules carries 4 oxygen molecules.

Given that the molar mass of  hemoglobin = 64,5000 g/mol

1 gram of  hemoglobin = [tex]\frac{1}{64500}moles[/tex]

Now, no of moles of oxygen carried in 1 mole of  hemoglobin = [tex]\frac{1}{64500}* 4 \ \ moles[/tex]

= [tex]6.2016*10^{-5}[/tex] moles

assuming the oxygen is to be an ideal gas; then:

PV = nRT

[tex]V =\frac{nRT}{P}[/tex]

Given that :

[tex]\frac{RT}{P}= 22.4 \ L/mol[/tex]

Then V = [tex]6.2016*10^{-5}[/tex] [tex]*22.4 *1000 \ mol[/tex]

V = 1.389 mL

Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.

Answer:

The half-reaction that occurs on the anode of an electrolytic cell is called oxidation.

This can easily be depicted by a chemical reaction as such "Zn(s) = Zn2+ (aq) + (2e-)"

While, the Zinc in this reaction loses two elections. Hence copper gains those electrons and becomes solid.

These reactions occurring on the anode are called positive reactions.

While the reaction that occurs on the cathode is called reduction. This reaction can be represented by this equation "Cu2+ (aq) + 2e- = Cu(s)".

These non-spontaneous reactions occurring in an electrolytic cell together are called redox reactions. These generate electrical energy.

In the electrolytic cell for commercial magnesium production, the half-reaction at the anode (positive electrode) is oxidation, where electrons are lost. If magnesium chloride is the electrolyte, chloride ions are oxidized to form chlorine gas.

In the electrolytic cell used for the commercial production of magnesium, the anode is the positive electrode. As it is where oxidation occurs, the half-reaction happening at the anode involves the removal of electrons. The specific half-reaction varies based on the electrolyte used. If pure molten magnesium chloride (MgCl2), a common electrolyte, is used, the half-reaction at the anode would be: Cl- —> Cl2 + 2e- . This equates that chloride ions (Cl-) lose electrons (are oxidized) to form chlorine gas (Cl2).

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Answer:

irreversible, exergonic, pyrophosphate

Explanation:

Reactions leading to nucleic acid and protein synthesis are inherently different from those of intermediary metabolism. Such reactions must be essentially irreversible. The synthesis of polynucleotides is thus coupled to exergonic pyrophosphate hydrolysis.

alpha ,beta and gamma are nuclear radiation

Answer: The concentration of the chemist's working solution is 0.00268 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

According to the neutralization law,

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of stock solution = 10.7 mmol/L =  0.0107 mol/L  [tex]1mmol=10^{-3}mol[/tex]

[tex]V_1[/tex]  = volume of stock solution = 90.0 ml

[tex]M_2[/tex] = molarity of working  solution = ?

[tex]V_2[/tex] = volume of working solution = 360 ml

[tex]0.0107\times 90.0=M_2\times 360[/tex]

[tex]M_2=0.00268M[/tex]

Thus the concentration of the chemist's working solution is 0.00268 M

Answer:

Option B

Explanation:

We have the tree solutions here:

A: weak monoprotic acid HA

B: Strong monoprotic acid HA'

C: weak diprotic acid H₂A

In order to explain this, let's discart the options one by one.

C and D cannot be the correct choice. This is because the pH is an expression that is determined by the following expression:

pH = -log[H₃O⁺]

In order to be the same value for all the solutions, the concentration of hydronium should be the same for all. This will be correct if all solutions were monoprotic and strong. However this is not the case.

Solution A and C are weak acids, so this means that they have dissociation constant Ka (In the case of C, it has two Ka values because it's diprotic). So, when these solutions reach the equivalence point or half the equivalence point, the concentration of the acid do not dissociate completely in solution, instead it do this:

HA + H₂O -------> A⁻ + H₃O⁺   Ka

0.1                        0        0

0.1-x                     x         x

[H₃O⁺] = x

Same thing happen with C, but we can see that the concentration is not the same as the innitial concentration.

Solution B is a strong acid, so it will dissociate completely in solution, so concentration of hydronium will be the same of the initial acid, and therefore the pH cannot be the same in the three solutions.

Option A cannot be either because, we have a diprotic solution, this means this acid requires two equivalence points to reach it's final, so, it takes more time and volume to reach the end point. Therefore, it's not the correct option.

Option B is the correct one, because regardless that we have a weak or a strong acid, or if it's diprotic or triprotic, the three of them have the same concentration of acid, and to reach the first equivalence point (the only point for A and B) will be the same for solution C. Therefore, this is the only thing the three solutions have in common.

The word equation can be represented as the constituents of the equation are written in their full name rather than a symbol.

The word equations for the following descriptions are:

Water = Hydrogen + Oxygen

Magnesium + Oxygen = Magnesium Oxide

Methane + Oxygen = Carbon dioxide + water

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To complete the given word equations:

A. Water -> hydrogen + oxygen;

B. Magnesium + oxygen -> magnesium oxide;

C. Methane + oxygen -> carbon dioxide + water.

To complete the word equations for the described reactions, we need to identify the reactants and products in each case:

A. Electrolysis: The word equation that represents the breakdown of water into hydrogen and oxygen gas is:

B. Magnesium Oxidation: The word equation describing the reaction of magnesium with oxygen to form magnesium oxide is:

C. Methane Combustion: The word equation for the burning of methane in oxygen to produce water and carbon dioxide is:

Write the word(s) to complete the word equation that matches the description of the reaction.

A. Electrolysis breaks down water to form hydrogen and oxygen gas. The word equation that represents this reaction is:

water -->

B. A bright light is produced when magnesium reacts with the oxygen in air to form magnesium oxide. The word equation that represents this reaction is:

magnesium + oxygen -->

C. When methane burns, it reacts with oxygen to produce water and carbon dioxide. The word equation that represents this reaction is:

methane + oxygen -->

Answer:

deoxyribonucleotides are so named because the lack a hydroxyl at the carbon position 2

Answer:

4.2 L

Explanation:

Use Boyle's Law and rearrange formula.

- Hope this helps! Please let me know if you need further explanation.

To find the volume of the neon gas at 1.2 atm, we can use the combined gas law equation.

To solve this problem, we can use the combined gas law equation:

P1V1 / T1 = P2V2 / T2

First, we need to convert the given volume in liters to moles using the ideal gas law equation:

V1 = nRT1 / P1

Then, we can rearrange the combined gas law equation to solve for V2:

V2 = (P2 * V1 * T2) / (P1 * T1)

Substituting the given values, we get:

V2 = (1.2 atm * 2.8 L * 273 K) / (1.8 atm * 273 K) = 1.233 L

Therefore, the volume of the neon gas at 1.2 atm would be 1.233 liters.

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Answer:

966.12 mmHg

Explanation:

-We apply Gay-Lussac's Law which holds that the pressure of a given gas is directly proportional to it's temperature(in Kelvins) for a constant volume:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

Given that:

[tex]0\textdegree C=273.15K\\\\T_1=1.0\textdegree C=274.15K\\P_1=750.0\ mmHg\\\\T_2=80\textdegree C=353.15K\\\\P_2=?[/tex]

#We therefore substitute in the formula above to solve for the final pressure, P2:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}\\\\P_2=T_2\times\frac{P_1}{T_1}\\\\=353.15K\times\frac{750\ mmHg}{274.15K}\\\\=966.12\ mmHg[/tex]

Hence,  is the new pressure inside the containe is 966.12 mmHg

Applying the concept of Gay-Lussac's law from physics, the pressure inside the plastic container of food, when heated from 1.0°C to 80°C, would increase to 966.67 mmHg.

To answer this question, we need to use the concept of Gay-Lussac's Law from physics, which states that the pressure of a gas is directly proportional to its temperature, keeping volume constant. This means when you heat a gas, its pressure will increase.

However, it's important to note that the temperatures must be in Kelvin, not degrees Celsius. So, firstly we convert our temperatures from Celsius to Kelvin. 1°C = 274.15K and 80°C = 353.15K.

Using the formula P1/T1 = P2/T2 (P stands for pressure and T for temperature, the 1's indicating initial conditions and the 2's final), we plug in the values:

750mmHg/274.15K = P2/353.15K. Solving the equation we find P2 = 966.67 mmHg.

So, by heating the plastic container of food from 1.0°C to 80.0°C, the pressure inside the container would increase to 966.67 mmHg.

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