what is the function of the cell membrane?​

Given that the compound contains 68.42% chromium and the rest oxygen, we can assume that the total mass of the compound is 100 grams. Therefore, the mass of chromium in the compound is:mass of Cr = 68.42 The mass of oxygen in the compound is:mass of O = 100 g - 68.42 31.58 g.

A compound is a substance that is made up of two or more different elements that are chemically bonded together in a fixed ratio. Compounds can be formed through chemical reactions between atoms, ions, or molecules, and they can have a wide range of physical and chemical properties.

Compounds are distinct from mixtures, which are combinations of substances that are not chemically bonded together and can be separated by physical means. In contrast, the atoms in a compound are held together by strong chemical bonds, and the compound has a unique set of properties that are different from those of its constituent elements.

Examples of common compounds include water (H2O), carbon dioxide (CO2), sodium chloride (NaCl), and glucose (C6H12O6). Compounds play an important role in many areas of science and industry, including medicine, agriculture, materials science, and environmental science.

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Here's link\(^{}\) to the answer:

bit.\(^{}\)ly/3gVQKw3

Answer:

B

Explanation:

The enthalpy change for the precipitation of PbBr₂ (s) is -79.4 kJ/mol.

To calculate the enthalpy change, we start with the balanced equation:

Pb(NO₃)₂ (aq) + 2NaBr (aq) → PbBr₂ (s) + 2NaNO₃ (aq)

First, we need to determine the moles of Pb(NO₃)₂ and NaBr used in the reaction.

Moles of Pb(NO₃)₂ = Volume (L) x Molarity = 0.2 L x 0.75 mol/L = 0.15 mol

Moles of NaBr = Volume (L) x Molarity = 0.2 L x 1.5 mol/L = 0.3 mol

The limiting reactant is Pb(NO₃)₂ because it has fewer moles. So, the moles of PbBr₂ formed will be equal to the moles of Pb(NO₃)₂ used, which is 0.15 mol.

Next, we need to calculate the heat evolved using the equation:

q = m × C × ΔT

The mass of the solution is the sum of the masses of Pb(NO₃)₂ and NaBr solutions:

Mass of solution = Volume (L) x Density (g/mL) = 0.2 L x 1.0 g/mL = 200 g

ΔT is given as 2.44°C, which is 2.44 K.

The specific heat capacity of the solution is 4.2 J/g°C.

Now we can calculate the heat evolved:

q = 200 g × 4.2 J/g°C × 2.44 K = 2028.96 J

Finally, we can convert the heat to kJ/mol:

ΔH = q / moles of PbBr₂ formed = 2028.96 J / 0.15 mol = -13526.4 J/mol ≈ -79.4 kJ/mol

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Answer

B. 11.2 grams

Explanation:

Molar mass of CaCl = 110.98 g/mol

Molar mass of KCl = 74.5513 g/mol

From the balanced chemical equation of the reaction given;

1 mole CaCl produced 2 moles KCl.

In grams;

(1 mol x 110.98 g/mol) CaCl produce (2 mol x 74.5513 g/mol) KCl, i.e

110.98 g CaCl produced 149.10236 g KCl,

Therefore, the grams of CaCl needed to produce 15.0 g KCl will be:

Therefore, 11.2 grams of calcium chloride are needed to produce 15.0 g of potassium chloride.

Answer:

V = 21.2 cm³

Explanation:

Given data:

Diameter of block = 3.0 cm

Volume of block = ?

Solution:

Formula:

V = 2πr³

First of all we will calculate the radius from diameter.

r = d/2

r = 3.0 cm/2

r = 1.5cm

V = 2(22/7) (1.5cm)³

V = 2(3.14) (3.375cm³)

V = 21.2 cm³

In this way, the Adhesion of water through hydrogen bonds to the molecules, which comprise the Villi on the cat's tongue.

What is Adhesion?

The act or quality of sticking or remaining fastened: the glue's adherence to the wood b. Physics The attraction between two substances that is strong enough to be seen at a macroscale and is caused by their differences.

What kind of bonds do water molecules form?

Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water. A bond known as a hydrogen bond is formed when individual water molecules are attracted to one another.

Which of the cat's tongue's villi works to resist gravity's pull downward?

By forming hydrogen bonds with the molecules that make up the villi on the cat's tongue, water adheres to them in this way, helping to fend off the effects of gravity. As a result, the phenomenon of adhesion aids in the maintenance of entire, joined drops of water.

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Answer: high temperatures

Explanation:

It varies.

Answer:

Melting point

Explanation:

Melting point is a intensive property and Intensive properties can be used to help identify a sample because these characteristics do not depend on the amount of sample, nor do they change according to conditions.

IF IT WAS HELPFUL HIT THE CROWN

Answer:

Explanation:

Yes melting point!

At the threshold value of a neuron, voltage-gated sodium (Na+) channels open. The threshold value of a neuron is the critical level of depolarization that must be reached in order for an action potential to be generated. When this threshold value is reached, it causes voltage-gated sodium (Na+) channels in the neuron's membrane to open.

This allows sodium ions to flow into the neuron, causing further depolarization and leading to the generation of an action potential.Voltage-gated potassium (K+) channels also play a role in the generation of action potentials. However, these channels do not open at the threshold value of a neuron.

Instead, they open later in the action potential, allowing potassium ions to flow out of the neuron and repolarize the membrane. Chemically-gated sodium (Na+) channels are also involved in the generation of action potentials, but these channels are not voltage-gated and are not involved in the threshold value of a neuron.

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Hydrolysis occurs when Fe2O3 is dissolved in water, resulting in the formation of Fe(OH)3 and H+ ions. For every Fe in Fe2O3, there are 1.5 O. Thus, the iron content of Fe2O3 is reduced.

Water in the liquid state serves as the solvent in an aqueous solution. In other words, water molecules surround and integrate solute (dissolved) ions and molecules into their web of bonds. Following that, the dissolved species dispersed all over the water.

Aqueous solutions are made up of water and one or more dissolved materials. Solids, gases, or other liquids can all dissolve in an aqueous solution.

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Question:

How Many Particles Fe2O3 Will Produce In An Aqueous Solution (In Water).

Answer:

4

Explanation:

Answer:

B.

Explanation:

I don't know much about this subject, but it seems that a wave is when the line is above the line in the middle.

Freezing of water: Exothermic , Boiling of water: Endothermic , Breakdown of food during digestion , A person running: Endothermic , A person growing: Endothermic, Turning graphite into diamond: Endothermic,

Exothermic refers to a process or reaction that releases heat or energy to the surroundings, typically resulting in an increase in temperature or the emission of heat.

Endothermic refers to a process or reaction that absorbs heat or energy from the surroundings, resulting in a decrease in temperature or the absorption of heat. It requires an external source of energy to occur.

Freezing of water: Exothermic (heat is released during the process)

Boiling of water: Endothermic (heat is absorbed during the process)

Breakdown of food during digestion: Exothermic (chemical reactions release energy)

A person running: Endothermic (body generates heat and consumes energy)

A person growing: Endothermic (energy is required for growth processes)

Turning graphite into diamond: Endothermic (energy is absorbed during the transformation)

Heating with a furnace: Endothermic or Exothermic, depending on the specific context and what is being heated.

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Exothermic processes release heat and include freezing of water, breaking down of food during digestion, and a person running. Endothermic processes absorb heat and include boiling of water, a person growing, turning graphite into diamond, and heating with a furnace.

Each process can be classified as exothermic or endothermic based on whether it releases or absorbs heat. The freezing of water is an exothermic process, as it releases heat into the environment. The boiling of water is endothermic because it requires heat to initiate the process.

The breakdown of food during digestion is also an exothermic process. It releases energy in the form of heat, which the body uses for metabolism. Similarly, a person running is going through an exothermic process as energy is released by the body in the form of heat and work.

A person growing, however, can be considered an endothermic process as it requires an input of energy. Turning graphite into diamond and heating with a furnace are generally endothermic processes, as they absorb heat and energy from their surroundings.

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The ATP (Available-to-Promise) for weeks 1 to 8 is the amount of inventory that a firm can commit to fulfilling customer orders within that time frame.

To calculate the ATP, you need to consider the MPS (Master Production Schedule) and the ATP calculations.

1. Start by looking at the MPS for weeks 1 to 8. The MPS represents the planned production quantities for each week.
2. Determine the beginning inventory for week 1. This is the inventory available at the start of week 1.
3. Add the MPS quantity for week 1 to the beginning inventory. This gives you the available inventory for week 1.
4. Subtract customer orders for week 1 from the available inventory. This gives you the remaining inventory after fulfilling customer orders for week 1.
5. Repeat steps 3 and 4 for each subsequent week, using the previous week's remaining inventory as the beginning inventory for the next week.
6. Continue this process until you reach week 8, calculating the available inventory and subtracting customer orders for each week.
7. The resulting values represent the ATP for weeks 1 to 8.

The ATP can fluctuate as new customer orders are received or changes are made to the MPS. Regular monitoring and adjustment of the ATP is necessary to ensure accurate order fulfillment.

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The age of the rock, based on the given parent to daughter ratio (1:0.5) and using the decay constant for the Potassium-40 isotopic system, is approximately 760 million years.

To determine the age of the rock using the radiometric age equation, we need the parent ratio (P), daughter ratio (D), and the decay constant (λ) for the specific isotope system being used. In this case, the Potassium-40 (K-40) isotopic system is used.

Given:

Parent ratio (P) = 1

Daughter ratio (D) = 0.5

Decay constant (λ) = 5.34 x 10^(-10) (per year for K-40)

Using the radiometric age equation: t = ln(1 + (D/P)) ÷ λ

Substituting the given values:

t = ln(1 + (0.5/1)) ÷ (5.34 x 10^(-10))

Calculating:

t = ln(1.5) ÷ (5.34 x 10^(-10))

Using a scientific calculator, we find that ln(1.5) is approximately 0.4055.

Substituting the value:

t = 0.4055 ÷ (5.34 x 10^(-10))

Calculating:

t ≈ 7.60 x 10^8 years

Therefore, the age of the rock, based on the given parent to daughter ratio (1:0.5) and using the decay constant for the Potassium-40 isotopic system, is approximately 760 million years.

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Answer:

the answer is ecosystem i believe.

Answer:

ecosystem

Explanation:

2-Methyl-2-butanol is a type of alcohol that is also known as tert-butyl alcohol or 2-methylpropyl alcohol.

what are the properties of 2-Methyl-2-butanol ?

It is a clear, colorless liquid that has a characteristic sweet and fruity odor. This alcohol is used in a variety of applications, including as a solvent, as a fuel additive, and as an intermediate in the synthesis of other chemicals. It is also used in the production of various fragrances and flavors, as well as in the formulation of certain pharmaceuticals and personal care products.

2-Methyl-2-butanol (tert-butyl alcohol) is a branched-chain alcohol that is characterized by its four carbon atoms and its secondary alcohol functional group. It is a clear, colorless, and relatively low-volatility liquid that has a low water solubility and a relatively low boiling point compared to other alcohols of similar molecular weight.

In terms of its properties and uses, 2-methyl-2-butanol is an effective solvent for a variety of organic compounds, including resins, fats, and oils, and it is also used as a starting material for the production of other chemicals. As a fuel additive, it can help to increase the octane rating of gasoline, and it can also help to reduce engine knock and improve fuel efficiency.

2-Methyl-2-butanol is a type of alcohol that is also known as tert-butyl alcohol or 2-methylpropyl alcohol.

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Answer:

b,c,d

Explanation:

bc i got it right

The apparatus that could be used to detect that a chemical change occurred with a substance in a laboratory setting are as follows:

Thus, the correct options for this question are B and C.

A chemical change may be defined as an alteration in the properties of one material into another. New materials or substances are formed with different properties along with appearance. It results when a substance combines with another to form a new substance.

An odor test and detecting the liberation of gas in the experiment are some of the best ways to reveal whether a chemical change may occur during the reaction or not, while the rest of the options are not as much as practical.

Therefore, the correct options for this question are B and C.

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Answer:

the breaking down of rock is known as weathering

Answer:

True

Explanation:

The endocrine system's main function is to distribute hormones throughout the body.

hope this helps, brainliest appreciated!

Using the ideal gas law PV =nRTPV=nRT , we find that the pressure will be P =\frac{nRT}{V}P=

V

nRT

​

 . Then, we'll substitute and find the pressure, using T = -25 °C = 248.15 K and R = 0.0821 \frac{atm\cdot L}{mol \cdot K}

mol⋅K

atm⋅L

​

 :

P =\frac{nRT}{V} = \frac{(0.33\,\cancel{mol})(0.0821\frac{atm\cdot \cancel{L}}{\cancel{mol \cdot K}})(248.15\,\cancel{K})}{15.0\,\cancel{L}} = 0.4482\,atmP=

V

nRT

​

=

15.0

L

​

(0.33

mol

)(0.0821

mol⋅K

atm⋅

L

​

​

)(248.15

K

​

)

​

=0.4482atm

In conclusion, the pressure of this gas is P=0.4482 atm.

Reference:

Chang, R. (2010). Chemistry. McGraw-Hill, New York.

Answer:

Electric Current

This is a flow of electrons (such as the flow of electrons in a wire to light up a lamp).

Insulator

These stop the electricity from flowing (think rubber and glass).

Resistance

This is slowing the flow of electrons (the current) and where some of the electrons' energy gets converted into heat.

Conductor

These allow electricity to flow easily through them (think copper and aluminum).

This question is providing the equilibrium constant for the decomposition of PCl5, by the way, to PCl3 and Cl2. Thus, the equilibrium concentrations of all species are required  and found to be 0.0206 M, 0.0294 M and 0.0294 M, respectively, and  after doing the following equilibrium-based calculations:

In chemistry, chemical equilibrium is a condition a chemical reaction reaches when it cannot proceed anymore up to a specific extent of conversion of reactants to products.

In such a way, when having a chemical equation, one can apply the law of mass action, in order to know a constant ratio, or equilibrium expression, at which the reaction stops and maintains constant as the time goes by.

Thus, we can write the equilibrium expression for this reaction as follows:

\(K=\frac{[PCl_3][Cl_2]}{[PCl_5]}\)

Next, we apply the ICE chart to write the aforementioned in terms of the reaction extent, x:

\(0.0420=\frac{x*x}{0.0500M-x}\)

And thus solve for x to get the following results:

\(x_1=-0.0714M\\\\x_2=0.0294M\)

Evidently, the correct answer is x2 because we are talking about concentrations that cannot be negative for any reason. Hence, the concentrations at equilibrium turn out to be:

\([PCl_3]=x=0.0294M\)

\([Cl_2]=x=0.0294M\)

\([PCl_5]=0.0500M-x=0.0206M\)

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Answer:

The SI system : The international system of units.

It is a scientific method of expressing the magnitudes or quantities of important natural phenomena.

Benefits of SI system

Answer:

1) mixture of elements

2) single compound

3) mixture of elements and compounds

Explanation:

1) there are two different elements in the diagram, which are not chemically combined together, so they are a mixture

2) two elements chemically combined together

3) there are different elements and compounds present

The answer is False.

Answer:

Negative

Explanation:

Electron is a subatomic particle with a negative charge of -1e unlike the proton which has a positive charge of +1e

In an atom, an electron has a net negative charge revolving in orbits around the nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

a) [H₃O⁺] = 1.8x10⁻⁵ M

b) pH = 4.75

c) % rxn = 3.5x10⁻³ %

Explanation:

a) The dissociation reaction of HCN is:

HCN(aq) + H₂O(l) ⇄ H₃O⁺(aq) + CN⁻(aq)

0.5 M - x                       x               x

The dissociation constant from the above reactions is given by:

\(Ka = \frac{[H_{3}O^{+}][CN^{-}]}{[HCN]} = 6.17 \cdot 10^{-10}\)

\( 6.17 \cdot 10^{-10} = \frac{x*x}{(0.5 - x)} \)

\( 6.17 \cdot 10^{-10}*(0.5 - x) - x^{2} = 0 \)

By solving the above quadratic equation we have:

x = 1.75x10⁻⁵ M = 1.8x10⁻⁵ M = [H₃O⁺] = [CN⁻]

Hence, the [H₃O⁺] is 1.8x10⁻⁵ M.

b) The pH is equal to:

\(pH = -log[H_{3}O^{+}] = -log(1.75 \cdot 10^{-5} M) = 4.75\)    

Then, the pH of the HCN solution is 4.75.

c) The % reaction is the % ionization:

\( \% = \frac{x}{[HCN]} \times 100 \)

\( \% = \frac{1.75 \cdot 10^{-5} M}{0.5 M} \times 100 \)

\( \% = 3.5 \cdot 10^{-3} \% \)          

Therefore, the % reaction or % ionization is 3.5x10⁻³ %.

I hope it helps you!