The stomach is an example of ....
a cell or a tissue or an organ or an organ system

Answer:

C) one magnesium and one oxygen

Answer:

pH = -log₁₀ [H⁺]

Explanation:

pH is a value in chemistry used in to measure solution trying to determine each quality, purity, risks for health of some products, etc.

As you write in the question, [H⁺] = 10^(-pH)

Using logarithm law (log (m^(p) = p log(m):

log₁₀ [H⁺] = -pH

And

Answer:

7 (a neutral solution)

Answer: 10-7= 0.0000001 moles per liter

5.6 (unpolluted rainwater)

Answer: 10-5.6 = 0.0000025 moles per liter

3.7 (first acid rain sample in North America)

Answer: 10-3.7 = 0.00020 moles per liter

The concentration of H+ in the Hubbard Brook sample is 0.00020/0.0000025, which is 80 times higher than the H+ concentration in unpolluted rainwater.

Explanation:

plato

Answer:

4. KCl(s)

Explanation:

KCl is an ionic salt that dissolves in water to form a KCl aqueous solution.

A solution is defined as the homogeneous mixture of one or more solutes dissolved in a solvent. Here in the saturated solution of potassium chloride, the solute is KCl. The correct option is 4.

A solute is defined as the substance which is dissolved in a solution. In a solution the amount of the solute present is always smaller than the amount of the solvent. For example in a salt solution, salt dissolves in water and therefore salt is the solute.

The particles of the solute present in a solution cannot be seen by our eye. The solute from a solution is not possible to separate by filtration. In an unsaturated solution, the concentration of the solute is much lower than that of the concentration of the solvent.

A solution is a combination of the solute and the solvent.

Thus the correct option is 4 - KCl.

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Answer:

Compound 1- ionic solid

Compound 2- can't really decide

Compound 3- molecular solid

Explanation:

An ionic solid has a very high melting point. It is hard but not brittle. It's solution or melt but not it's solid conducts electricity. Compound 1 is an ionic solid.

We can't really decide on compound 2 since it is brittle yet it's solution conducts electricity.

Lastly, compound 3 is a molecular solid since it has a low melting point.

Answer:

Compound 1- ionic solid

Compound 2- can't really decide

Compound 3- molecular solid

Explanation:

Answer:

Point the syringe upright and tap firmly to move the bubbles to the top and expel by pushing the plunger

Explanation:

If you hold the syringe upside down the bubbles will end up at the bottom of the syringe by the plunger since they float up when tapped

The electric current is  0.025 A

Electric current refers back to the go with the flow of energy in an electronic circuit and to the amount of strength flowing through a circuit. it's far measured in amperes (A). the bigger the cost in amperes, the more energy is flowing within the circuit.

Ag+ + e¯ →Ag

1F deposits 107.87 g/mol (molecular mass) of silver

1F = 96500 C

Let, 107.87 g/mol needed = 96500 C

Number of coulombs required to deposit 0.3650 g of silver =(96500/107.87) 0.3650  

Q = 326.5 C

According to Faraday’s law, Q = I x t

I = 326.5 C / (216 x 60 s) = 0.025 A

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The awnser is D. polarity

A microscopic property that helps determine whether or not two substances will dissolve with each other is: D. polarity.

Solubility can be defined as a measure of how readily a substance dissolves in a solvent to form a solution. Therefore, a substance is generally considered to be soluble if it is able it dissolve completely in a solvent and it is said to be insoluble if it does not dissolve in a solvent or only dissolves partially.

On a related note, polarity refers to a microscopic property that is typically used to determine whether or not two (2) substances will dissolve with each other.

Basically, the polarity of a substance connotes the distribution of electrical charge (electrons) around its atom by virtue of a chemical bond. Thus, the polarity of a substance is grouped into two (2) main categories and these are:

In conclusion, this microscopic property referred to as polarity helps to determine whether or not two substances will dissolve with each other.

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The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

985.2 moles of nitrogen can produce 1970.4 moles of ammonia.

Explanation:

The balanced chemical equation for the production of ammonia from nitrogen is:

N2 + 3H2 → 2NH3

From the balanced equation, we can see that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia.

So, to determine how many moles of ammonia can be produced from 985.2 moles of nitrogen, we need to use the mole ratio from the balanced chemical equation as follows:

985.2 moles N2 x (2 moles NH3 / 1 mole N2) = 1970.4 moles NH3

Therefore, 985.2 moles of nitrogen can produce 1970.4 moles of ammonia.

NaOH is present in the final solution in an amount of 0.0229 M.

The dilution is calculated by dividing the total volume by the volume of stock that was introduced. To obtain the final concentration, one doubles the stock concentration by this dilution factor.

First, we must determine how many moles of NaOH are present in the 747 mL of 0.250 M NaOH solution:

moles of NaOH = (0.250 mol/L) x (0.747 L) = 0.187 moles

The total volume of the finished solution in litres must then be determined. The resulting solution's total volume is: 1.96 gallons = 7.41 litres, or:

total volume = 747 mL + 7.41 L = 8.157 L

Finally, we can figure out how much NaOH is in the finished solution:

concentration of NaOH = moles of NaOH / total volume of solution

concentration of NaOH = 0.187 moles / 8.157 L

concentration of NaOH = 0.0229 M

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Explanation:

The answer is directly proportional, because when there is more concentration their will more reactants to react fast diring the chemical reaction which increases the rate of chemical reaction.

So, we can state that the relationship between them are directly proportional.

Hope it helps...

According to the given statement 1812.5 g mass of solution can be prepared.

When one substance dissolves, or separates into the other, a solution is created. A solute is the name for the material that dissolves to create a solution. A solvents is the material that a solution will dissolve in. Sugar is the solute while water is the solvent in a sugar syrup.

8.0% by mass NaCl means 8 g NaCl in a total of 145 g solution. (note it is g of total solution)

Use dimensional analysis:

145 g NaCl x 100 g solution/8 g NaCl

= 1812.5 g solution

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Answer:

0.016 m³

Explanation:

Step 1: Given data

Width of the tank (w): 18 in

Height of the tank (h): 11 in

Depth of the tank (d): 5 in

Step 2: Calculate the volume of the tank in in³

The fuel tank is a cuboid. We can calculate its volume using the following expression.

V = w × h × d

V = 18 in × 11 in × 5 in

V = 990 in³

Step 3: Convert 990 in³ to m³

We will use the relationship 1 m³ = 61023.7 in³.

990 in³ × (1 m³ / 61023.7 in³) = 0.016 m³

The volume of hydrogen gas collected over water is approximately 25.10 liters. We need to consider the stoichiometry of the reaction, the ideal gas law, and the partial pressure of hydrogen gas.

First, let's balance the equation for the reaction between magnesium (Mg) and hydrochloric acid (HCl):

Mg + 2HCl -> MgCl₂ + H₂

From the balanced equation, we can see that 1 mole of magnesium reacts to produce 1 mole of hydrogen gas.

1. Calculate the number of moles of magnesium (Mg):

Molar mass of Mg = 24.31 g/mol

Number of moles of Mg = Mass of Mg / Molar mass of Mg = 25.6 g / 24.31 g/mol = 1.054 mol

2. Calculate the number of moles of hydrogen gas (H₂):

Number of moles of H₂ = Number of moles of Mg = 1.054 mol

3. Apply the ideal gas law to calculate the volume of hydrogen gas (V₂):

PV = nRT

Given:

Pressure (P) = 785.4 torr

Temperature (T) = 36.5 °C = 36.5 + 273.15 K = 309.65 K

R = 0.0821 L·atm/(mol·K) (gas constant)

Number of moles (n) = 1.054 mol

Convert the pressure to atm:

785.4 torr = 785.4 torr * (1 atm / 760 torr) = 1.032 atm

Substituting the values into the ideal gas law equation:

V₂ = (nRT) / P = (1.054 mol * 0.0821 L·atm/(mol·K) * 309.65 K) / 1.032 atm ≈ 25.10 L

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Lead levels in plankton and algae are high, mostly as a result of environmental pollution brought on by human activity. While it is true that some brown algae species have the ability to accumulate heavy metals like lead.

Plankton and algae have high levels of lead, mostly as a result of environmental contamination brought on by human activities including mining, industrial operations, and the burning of fossil fuels.

Due to the fact that plankton and algae take up trace quantities of lead from the surrounding water, their tissues contain greater concentrations of the metal.

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Answer:

temperature, or true. I don't know which you want.

Explanation:

hope this helps

Answer:

Explanation:

Here, we want to get the pressure of the tank

To get this, we use the ideal gas equation as follows

Mathematically:

Where:

P is the pressure which we want to calculate

V is the volume which is 20 L

n is the number of moles which is 8.20

T is the temperature that we have to convert to Kelvin by adding 273 (53 + 273 = 326 K

R is the molar gas constant which is 0.0821 L.atm/mol.K

Substituting the values, we have it that:

We would need about 16 hydrogen atoms so that we can convert the compound to a saturated fat.

In animal products like meat and dairy, saturated fat is a form of dietary fat that is normally solid at room temperature. It is known as being "saturated" because each molecule of fat has the most hydrogen atoms possible, giving it a stable structure.

We can see this by counting the number of double bonds in the fat and there are eight of them so sixteen hydrogen atoms are needed for saturation.

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Triple beam balance is not used to measure the weight of water because it is used to  measure mass.

The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.

Spring balance is used to measure the weight of the body whereas beam balance is used to measure the mass of the body. Since the mass of the body remains the same on earth as well as on moon but the acceleration due to gravity differs.

Therefore Triple beam balance is not used to measure the weight of the water.

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The relative atomic mass of the inert gas would be 201.7.

The rate of diffusion of a gas is inversely proportional to the square root of its molar mass. So, we can use the following formula to find the relative atomic mass of the noble gas:

( Molar mass of noble gas / Molar mass of oxygen ) = ( Rate of diffusion of oxygen / Rate of diffusion of noble gas )^2

We can plug in the given values:

( Molar mass of noble gas / Molar mass of oxygen ) = (500 cm^3 / 141.1 cm^3)^2

Simplifying:

( Molar mass of noble gas / Molar mass of oxygen ) = (3.541)^2

Molar mass of noble gas = Molar mass of oxygen * (3.541)^2

We know that the molar mass of oxygen is approximately 16 g/mol (as it is the most common isotope of oxygen), so we can substitute that value:

Molar mass of noble gas = 16 g/mol * (3.541)^2

Molar mass of noble gas = 201.7 g/mol

The relative atomic mass of the noble gas is equal to its molar mass, since its atomic mass is based on the atomic mass unit (amu) which is defined in relation to the molar mass of carbon-12. Therefore, the relative atomic mass of the noble gas is approximately 201.7.

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Atomic radius. Option B is corect

Periodic table are tables that consist of elements arrnaged in rows and columns. From the given question, we are to find the determine which property decreases across the periodic table.

From the given option, the atomic radius is the only property that decreases as you proceed from left to right across a row on the periodic table

It is accurate what is said about membranes below: an enzyme-mediated mechanism is mostly responsible for lateral diffusion.

A substance can be either hydrophobic or hydrophilic. Given that the word "hydr" is derived from the Greek word "hydor," which means "water," hydrophobic materials are "water-fearing" and do not blend with water, whereas hydrodynamic materials are "water-loving" and have a propensity to become wetted by water.

Non-polar substances with a low affinity for water are referred to as hydrophobic substances and are water-repellent. As opposed to a hydrophobic interaction, which is indicated by a contact angle larger than 90°, a hydrophilic interaction is indicated by a contact angle less than 90°.

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Answer: Well one difference is that Jupiter's moons are large and are closer to each other. Also Jupiter has more moons than Saturn.

Explanation:

Answer:

The difference are :

jupiter moon saturn moon

1.jupitor moon has 4 1.saturn moon

moon has 7 moon

a) H2 + O2 = H2O -----> Synthesis

b) N2H4(l)—> NH3(g)+N2(g) ----> Decomposition

c) H2SO4 + NaOH —> H2O+Na2SO4 ----> Double-displacement

d)Al2 (CO3) -^-> Al2O3 + CO2----> Decomposition

e) NH4I+ Cl2 —-> NH4Cl+I2 ----> Single displacement

Concentration of H+ ions in HNO3 solution is 10⁻¹ which is equal to 0.1 M

\( \bf \: pH \: = - log[{h}^{ + }]\)

putting the value we get

\( \sf \dashrightarrow \: pH \: = - log \: [ \frac{1}{10}] \\ \\ \sf \dashrightarrow \: pH \: = - log \: {10}^{ - 1} \\ \\ \sf \dashrightarrow \: pH \: = 1\)

So, the required option is A) 1

The ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)).

Aluminum (Al) typically has an atomic number of 13, which means it has 13 protons and 13 electrons in its neutral state. However, in the given ion, \(Al^{3+}\), the ion has lost three electrons, resulting in a +3 charge. This means that the ion now has 13 protons and only 10 electrons remaining, giving it a net positive charge of +3.

The atomic mass of aluminum is 26.98 atomic mass units (amu). The given ion has an atomic mass of 71 amu, which suggests that the ion has gained additional particles. In this case, the ion has also gained three neutrons, resulting in a higher atomic mass.

The total number of particles (protons, neutrons, and electrons) in the ion can be calculated by adding the number of protons (13) and the number of neutrons (3), which equals 16. Since the ion has a net charge of +3, it only contains 10 electrons.

In summary, the ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)), which has 13 protons, 10 electrons, and 3 neutrons.

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