Fill in the Blanks :
1) Number of Proton + Number of Neutron is the ________ of an element.
2) A-Z indicates the number of _______ in the nucleus of an atom.
3) Z = number of protons in the nucleus of an atom = number of _____ in a neutral atom.

Answer:

13.25 M

Explanation:

Molarity is moles over liters so simply plug your values in as such:

5.30 mol ÷ 0.400 L = 13.25 M

Answer:

What do you mean need more details

Explanation:

Since a help device is a a communication gadget, we know that the help device will make use of radio waves.

A help device refers to a device that can be used for emergency communication. They are basically communication gadgets.

We must note that our communication gadgets such as television,  radio, cell phone etc all make use of radio waves. Hence a help device would make use of  radio waves.

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The correct answer describes Newton's second law of motion : A. Force = mass x acceleration (F=m.a)

Newton's 2nd law states that :

the acceleration from the applied force is proportional to the resultant force and inversely proportional to the mass

Can be formulated

\(\tt a=\dfrac{F}{m}\)

or

\(\tt F=m\times a\)

F = force, N

m = mass, kg

a = acceleration, m/s²  

At Intermediate biopolymer concentrations, the viscosity increases because of attraction between polymer molecules. Above a critical biopolymer concentration .

Option B is correct.

Proteins (made up of amino acid polymers), genetic material (made up of nucleic acid polymers), glycoforms (made up of carbohydrates and glycosylated molecules), metabolites, and other structural molecules are all examples of biopolymers.

Polyhydroxyalkanoates (PHAs) and polylactic acid (PLA) are two examples of biopolymers produced by conventional chemical processes and found in microorganisms or genetically modified organisms. These include proteins from milk or collagen as well as polysaccharides made from cellulose.

Incomplete question:

The viscosity of an aqueous solution increases as increasing amounts of a thickening agent are added to it. which of these statements is false?

a. At low biopolymer concentrations, the viscosity increases linierly (Einstan's Law)

b. At Intermediate biopolymer concentrations, the viscosity increases because of attraction between polymer molecules. Above a critical biopolymer concentration

c.  the biopolymer chains overlap and become entangled causing a steep increases in viscosity.

d. The value of c decreases as the volume ratio (Rv) of a biopolymer increases

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Heat is transferred from the sun to the sand by radiation, from the sand to the feet by conduction, and from the feet to the water by convection.

Heat is transferred by 3 methods depending on the molecule:

Heat waves travel through the air to heat up the sand, a radiational process. Walking across the hot sand on the beach, heat from the sand will get transferred to your feet by conduction because your feet are solid.

When you place your feet into the cold beach water, a convectional current helps transfer the heat from your feet to the water.

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The correct answer is c) this structure will be able to either accept a proton or donate a proton. This functional group exhibits both acidic and basic properties.

The organic functional group you mentioned can accept a proton or donate a proton, which means it can act as an acid or a base. Its structure, bonding, and properties are determined by the presence of a hydrogen atom attached to an electronegative atom, such as oxygen or nitrogen.

This functional group is called an amphoteric group. It has a lone pair of electrons that can accept a proton, making it basic, and it can also donate a proton from the hydrogen atom, making it acidic.

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Glucose concentration causes yeast to produce more fermentation, but when the saturation gradient is reached, carbon dioxide production stops.

Chemical processes happen when atoms create or dissolve chemical bonds. Products are the molecules that are produced as a result of a chemical reaction, whereas reactants are the ingredients that initiate one.

A chemical reaction happens when one or more substances change into one or more new substances. Consider the rust that results from the reaction between iron and oxygen. When vinegar & baking soda are mixed, sodium acetate, nitrous oxide, or water are the results.

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Answer:True

Explanation:

Answer:

Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form intermolecular bonds with the polar water molecules. The weak bonds that form between the solute and the solvent compensate for the energy needed to disrupt the structure of both the pure solute and the solvent.

The power required by the "active Na⁺ pumping" system to produce this flow against the +25 mV potential difference is approximately 4 × 10⁻¹⁷ W.

To calculate the power required by the "active Na⁺ pumping" system, we need to consider the current (rate of ion movement) and the potential difference across the axon. Power is given by the equation:

Power = Current × Voltage

Given:

Current (I) = 5 × 10⁻⁷ mol/(m²·s)

Voltage (V) = +25 mV = +25 × 10⁻³ V (since 1 mV = 10⁻³ V)

To determine the power, we need to convert the current to amperes (A) and multiply it by the voltage:

I (in A) = Current × elementary charge (e)

e = 1.6 × 10⁻¹⁹ C (charge of an electron)

Now we can calculate the power:

Power = I × V

First, let's convert the current from mol/(m²·s) to A/m²:

I (in A/m²) = Current (in mol/(m²·s)) × Avogadro's number (Nₐ) / time (s)

Nₐ = 6.022 × 10²³ mol⁻¹ (Avogadro's number)

Now, we can calculate the power:

Power = I (in A/m²) × V (in V)

Note: We assume the axon is a cylinder with a circular cross-section.

Given:

Length of axon (L) = 10 cm = 0.1 m

Diameter of axon (d) = 20 μm = 20 × 10⁻⁶ m

To calculate the cross-sectional area (A) of the axon, we use the formula for the area of a circle:

A = π × (d/2)²

Now, we can calculate the power:

Power = I (in A/m²) × V (in V) × A (in m²)

Substituting the given values:

A = π × (20 × 10⁻⁶ / 2)² = π × 100 × 10⁻¹² m²

Power = (5 × 10⁻⁷ A/m²) × (25 × 10⁻³ V) × (π × 100 × 10⁻¹² m²)

Simplifying the expression:

Power ≈ 4 × 10⁻¹⁷ W

Rounding to one significant figure, the power required by the "active Na⁺ pumping" system to produce this flow against the +25 mV potential difference is approximately 4 × 10⁻¹⁷ W.

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Answer:

1. a) Crystalline hydrated salt lose their mass or moisture on exposure to the air and change into amorphous salt, the phenomenon is called efflorescence.

b) Two salts that x could be are gypsum (Caso4.H2O) and copper (II) sulfate (CuSO4.H2O).

Gypsum (Caso4.H2O) form anhydrite(CaSO4), when exposed to air and copper (II) sulfate (CuSO4.H2O) form a white layer of anhydrous copper (II) Sulfate when expose to sir.

2. a) Salt hydrolysis is defined as the ions from salts react with water and form either basic or an acidic solution.

b) Two examples of salts that produce alkaline solutions when dissolving in water are sodium bicarbonate (NaHCO3) and Calcium Carbonate (CaCO3).

The correct answer is B. 0.2 mole. To determine the mole of pyridirium chloride (\(C_5H_5NH_{Cl}\)) that should be added to 500 mL solution of 0.4 M pyridine (\(C_5H_5N\)) to obtain a buffer solution of pH=5.

We need to use the Henderson-Hasselbalch equation: pH = pKa + log([base]/[acid])We are given the pH (5) and the equilibrium constant (1×10 −9), which we can use to find the pKa:pKa = -log(1×10 −9) = 9.

We can also find the concentration of the base ([base]) by using the given molarity (0.4 M) and volume (500 mL):[base] = (0.4 M)(0.5 L) = 0.2 MNow we can plug in the values into the Henderson-Hasselbalch equation and solve for the concentration of the acid ([acid]):5 = 9 + log(0.2 M/[acid])log(0.2 M/[acid]) = -4[acid] = 0.2 M × 10^4[acid] = 2 M.

To find the moles of the acid, we can use the equation: Moles = Molarity × Volume Moles = (2 M)(0.5 L)Moles = 1 moleBut we need to find the moles of pyridirium chloride (\(C_5H_5NH_{Cl}\)), not the moles of the acid (C5H5NH+). Since there is a 1:1 ratio between the acid and the pyridirium chloride, the moles of pyridirium chloride will be the same as the moles of the acid: Moles of pyridirium chloride = Moles of acid = 1 mole.

Therefore, the mole of pyridirium chloride that should be added to 500 mL solution of 0.4 M pyridine to obtain a buffer solution of pH=5 is 0.2 mole (B).

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Answer: do you guys know the answer

Explanation:

Answer:

gains,oxidizing

Explanation:

Zn(s) + Cu^2+---> Zn^2+(aq) + Cu(s)

I got the answer right on usatp.

Answer:

\(m_{NH_3}^{leftover}=57.88g\)

\(Y= 92.0\%\)

Explanation:

Hello there!

In this case, according to the following chemical reaction between iodine monobromide and ammonia:

\(3IBr+NH_3\rightarrow NI_3+3HBr\)

It turns out firstly necessary to identify the limiting reactant, by considering the proper molar masses and the 3:1 and 1:1 mole ratios of iodine monobromide to nitrogen triiodide and ammonia to nitrogen triiodide respectively:

\(n_{NI_3}^{by\ IBr}=164.8gIBr*\frac{1molIBr}{206.81gIBr}*\frac{1molNI_3}{3molIBr} =0.266molNI_3\\\\n_{NI_3}^{by\ NH_3}=62.4gNH_3*\frac{1molNH_3}{17.03gNH_3}*\frac{1molNI_3}{1molNH_3} =3.66molNI_3\)

Thus, we conclude that the limiting reactant is IBr as is yields the fewest moles of nitrogen triiodide product. Next, we can calculate the reacted grams of ammonia as the excess reactant:

\(m_{NH_3}^{reacted}=0.266molNI_3*\frac{1molNH_3}{1molNI_3}*\frac{17.03gNH_3}{1molNH_3}=4.52gNH_3\)

And therefore the leftover of ammonia is:

\(m_{NH_3}^{leftover}=62.4g-4.52g=57.88g\)

Next, the percent yield is calculated by firstly calculating the theoretical yield of nitrogen triiodide as follows:

\(m_{NI_3}^{theoretical}=0.266molNI_3*\frac{394.72gNI_3}{1molNI_3} =104.8gNI_3\)

And finally the percent yield by dividing the given actual yield of 96.4 g by the previously computed theoretical yield:

\(Y=\frac{96.4g}{104.8g}*100\%\\\\Y= 92.0\%\)

Best regards!

Answer:

I think A does because there are so many letters in their so a

Answer:

I know for a fact the correct answer is B

Answer:

A

Explanation:

BECAUSE plants use carbon dioxide for photosynthesis.

It is important not to dilute the initial sample before it has been loaded on chromatography column, it is crucial to avoid dilution in order to reduce the matrix effect and prevent detector saturation.

Additionally, it is done to guarantee that saturation stays within the calibration curve's acceptable range. The solvent level must be lower than the TLC's starting line in order to prevent the spots from dissolving. It is imperative that you just use a few drops of solvent to load the sample in this situation if you choose to load the column wet. If you utilise too much solvent, the loading solvent will obstruct the elution and, as a result, the mixture's separation. Because veins and bubbles will form and lead to poor separation, the solvent drop must not extend below the top of the adsorbent.

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To calculate the volume percent of dioxane we will apply the following formula:

In this case, the solute will be dioxane, and the volume will be 69.3 mL.

To calculate the volume of solution we will sum both volumes:

Volume of solution = Volume of dioxane + Volume of Toluene

Volume of solution = 69.3 mL + 1300 mL

Volume of solution = 1369.3 mL

We are given all the data with a significant digit, therefore we must report the result also with a significant digit. So the answer will be.

The volume percent of dioxane in the solution is 5.1 %(v/v)

The mass number of the daughter nuclide will remain the same as Thorium-234 (mass number 234). The correct answer is D. 234, 91.

When there are too many protons or neutrons in a nucleus, one of the protons or neutrons will turn into the other, which is known as beta decay. During beta minus decay, a neutron transforms into a proton, electron, and antineutrino.

A daughter nuclide is created when a neutron in the nucleus decays into a proton during beta decay. While the mass number stays constant, the atomic number rises by 1.

We know the daughter nuclide will have an atomic number one unit higher than thorium (atomic number 90) because thorium-234 (Th-234) undergoes beta decay. The daughter nuclide will continue to have the same mass number as thorium-234 (mass number 234).

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To determine the stability of the given closed-loop transfer functions, we need to analyze the locations of the poles in the complex plane. If all the poles have negative real parts, the system is stable.

If any pole has a positive real part, the system is unstable. If there are poles on the imaginary axis or have zero real parts, further analysis is required.

a) Transfer function: 8Kc / (5S + 1)

The pole of this transfer function is at S = -1/5. Since the real part of the pole is negative, the system is stable.

b) Transfer function: 8Kc / (S^2 + 3S + 2)

The poles of this transfer function are at S = -1 and S = -2. Both poles have negative real parts, so the system is stable.

c) Transfer function: 8Kc / (S^3 + 6S^2 + 12S + 8 + 8Kc)

To determine the stability of this transfer function, we need to find the roots of the polynomial in the denominator. The characteristic equation is S^3 + 6S^2 + 12S + 8 + 8Kc = 0.

By analyzing the roots of the characteristic equation for different values of Kc, we can determine the stability. If all the roots have negative real parts for any value of Kc, the system is stable.

However, without a specific value for Kc provided, we cannot conclusively determine the stability of the system. The stability of the system will depend on the specific value of Kc and the locations of the roots of the characteristic equation. Further analysis is required to determine the stability.

In summary:

a) The system is stable.

b) The system is stable.

c) The stability requires further analysis as it depends on the specific value of Kc and the locations of the roots of the characteristic equation.

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The original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water is 147.08°C.

The temperature in a calorimetry experiment can be calculated using the following formula:

Q = mc∆T

Where;

For a calorimetry;

Q(water) = -Q(metal)

mc∆T (water) = -(mc∆T) (metal)

100 × 4.18 × 4.6 = - (80 × 0.20 × {26.9 - x}

1922.8 = -430.4 + 16x

16x = 2353.2

x = 147.08°C

Therefore, the original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water is 147.08°C.

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Answer:

According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products

Explanation:

law of conservation of mass

From this equation, we can see that the mole ratio of FeO to MgO is 1:1. This means that for every one mole of FeO, there is one mole of MgO involved in the reaction.

What is Mole?

In chemistry, a mole is a unit of measurement that represents an amount of substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro's number and is approximately equal to 6.022 x 10²³ entities per mole.

The mole is used as a convenient way to express the amount of a substance in chemical reactions and calculations. For example, the stoichiometry of a chemical reaction is expressed in terms of mole ratios, which show the relative numbers of moles of reactants and products involved in the reaction. The concept of mole also allows us to convert between different units of measurement, such as grams and moles, using the molar mass of a substance.

The mole ratio of iron (II) oxide (FeO) and magnesium oxide (MgO) can be determined from the balanced chemical equation for the reaction between these two compounds. The balanced equation is:

FeO + MgO → Fe + Mg

From this equation, we can see that the mole ratio of FeO to MgO is 1:1. This means that for every one mole of FeO, there is one mole of MgO involved in the reaction.

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The LD50 (Lethal Dose 50) is a measure used in toxicology to determine the lethal dose of a substance that would cause death in 50% of the test population.

However, it is important to note that conducting experiments to determine the LD50 of a substance on humans is unethical and illegal. The LD50 values are typically determined through animal testing, usually on rodents such as rats or mice.To calculate the amount of a substance that would harm a person of a certain weight, various factors need to be considered, including the toxicity of the substance and the individual's weight. In toxicology, a commonly used measure is the oral median lethal dose (LD50) expressed as milligrams per kilogram of body weight (mg/kg).To estimate the harmful dose for an individual of a certain weight, you would need to know the LD50 value of the substance and apply it to the weight of the person. The calculation involves multiplying the LD50 value by the person's weight in kilograms. However, it is crucial to emphasize that estimating harmful doses for humans based on animal LD50 values alone can be inaccurate and potentially dangerous.

It is essential to consult professionals in toxicology or poison control centers to obtain accurate information regarding the toxicity of a substance and its potential effects on human health.

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Answer:

1.fluorine

3.carbon group element

5.yttrium

7.Ammonium

8Titanium

Explanation:

This is what I founded in my books. Sorry If it's wrong