I really need help plz I’ll give 40 points

Answer:

gkfbhs DC hdshgagfzh

Answer:

A) It increases when the concentration of reactants increases.

Explanation:

When you increase the concentration, there is more of a substance, and therefore more opportunities for the reactants to collide together with enough energy to create a product.

Answer:

A) It increases when the concentration of reactants increases.

Explanation:

It's just right!!!

When the concentrations of a weak acid and its conjugate base are equal in a solution, the -log of the [H+] and the -log of the Ka are equal.

The -log of the [H+] represents the pH of a solution, while the -log of the Ka represents the pKa, which is a measure of the acid dissociation constant. When the concentrations of a weak acid and its conjugate base are equal, it indicates that the system is at the half-equivalence point of a buffer solution.

At this point, the pH of the solution is equal to the pKa of the weak acid, resulting in the -log of the [H+] being equal to the -log of the Ka. This condition is important in buffer systems as it helps maintain the pH of a solution within a certain range and provides resistance to changes in acidity or alkalinity.

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Answer:

D

Explanation:

Answer:

C. Structure

Explanation:

Most water on Earth contains dissolved solvents because of water's polarity. Water is polar because of the polar covalent bond between hydrogen and water.This allows water to separate polar solutes and is what makes it such a good solvent. It is known as the universal solvent because it is capable of dissolving more substances than any other.

There would be more of the bicarbonate ion present in the solution at low pH.

We know that the pH has to do with the degree of the acidity of the alkalinity of a given solution. We know that carbonic acid can be able to dissociate in solution via a reversible reaction.

In this case, when the pH is low, we know that there would now be more of the bicarbonate ion as the acid would  begin to dissociate so as to counter the constraint of the pH that has been imposed on the system.

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Answer:

About 2.29 M.

Explanation:

Recall that molarity is defined by moles of solute over liters of solution.

Our solute is 105 grams of calcium nitrate (Ca(NO₃)₂)).

Convert 105 grams of Ca(NO₃)₂ to moles. The molecular weight of Ca(NO₃)₂ is 164.10 g/mol:

\(\displaystyle 105\text{ g Ca(NO$_3$)$_2$}\cdot \frac{1\text{ mol Ca(NO$_3$)$_2$}}{164.10\text{ g Ca(NO$_3$)$_2$}} = 0.640\text{ mol Ca(NO$_3$)$_2$}}\)

Convert 280. grams of water to liters. Recall that the density of water is given by 1.00 g/mL:

\(\displaystyle \begin{aligned} D & = \frac{m}{V} \\ \\ V & = \frac{m}{D} \\ \\ & = \frac{(280.\text{ g})}{\left(\dfrac{1.00\text{ g}}{1\text{ mL}}\right)} \\ \\ & = 280. \text{ mL}\cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.280\text{ L soln.}\end{aligned}\)

Hence, the molarity of the solution is:
\(\displaystyle \begin{aligned} \text{M} &= \frac{\text{ mols solute}}{\text{L soln.}} \\ \\ & = \frac{(0.640\text{ mol})}{(0.280\text{ L soln.})} \\ \\ & = 2.29\text{ M} \end{aligned}\)

In conclusion, the solution is about 2.29 M.

Answer:

the answer is 383.0

hope it is helpful

Answer:

Glucose

Explanation:

Photosynthesis is the process of the transformation of the light energy from the Sun into stored chemical energy that can serves as the major source of energy in the food chain

The overall chemical equation for photosynthesis reaction can be presented as follows;

6CO₂(g) + 12H₂O(l) + Light Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O

During cellular respiration, the energy in the glucose, C₆H₁₂O₆, is converted to energy stored in Adenosine Triphosphate (ATP) molecules which are released when the the ATP is converted into Adenosine Diphosphate (ADP)

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy containing ATP

The distance travelled by the particle between 0 seconds and 6 seconds is 12 m

Velocity is simply defined as the rate of change of displacement with time. Mathematically, it can be expressed as:

Velocity = displacement / time

From the question given above, the following data were obtained:

Velocity = displacement / time

The displacement of the object between 0 and 6 s is calculated as;

2 = displacement / 6

Cross multiply

Displacement = 2 × 6

Displacement = 12 m

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Option 2) Bromoethane and methanol is correct

The major products obtained upon treatment of ethyl methyl ether with excess HBr are Bromoethane and methanol.

What is ethyl methyl ether?

Ethyl methyl ether is a colorless gas that is used as a solvent. The IUPAC name for this compound is methoxyethane. It is a member of the ether family of compounds. When ethyl methyl ether reacts with excess HBr, it undergoes a substitution reaction and forms Bromoethane and methanol. The mechanism for this reaction is given below: Methoxyethane reacts with hydrogen bromide to produce methanol and ethyl bromide (bromoethane). Here are the products that are formed in this reaction: Bromoethane (C2H5Br) and Methanol (CH3OH)

The chemical equation for this reaction can be written as: CH3OCH2CH3 + HBr → CH3OH + CH3CH2Br \(\boxed{Option\ 2)}\)

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The approximate volume of reaction solution used in the experiments described in the passage was 500 μL.

Experiments are scientific procedures used to test hypotheses and evaluate theories. They involve manipulating one or more variables and measuring the outcome, allowing scientists to observe cause and effect relationships between the variables. Experiments are often conducted in controlled environments, such as laboratories, in order to ensure that the results are accurate and reproducible. Experiments are the cornerstone of scientific inquiry, allowing us to gain new knowledge and insights about the natural world.

This is because 0.5 mg of MgCl2 was added to the reaction mixture, and 1 mg of MgCl2 is equivalent to 2.3 μL of MgCl2. Therefore, the 0.5 mg of MgCl2 added to the reaction mixture is equivalent to 1.15 μL. Multiplying this by the dilution factor of 435, the approximate volume of reaction solution used in the experiments is 500 μL.

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Answer:

Explanation:

When it cools it turns back into a solid

Answer:

When a solid is heated the particles gain energy and start to vibrate faster and faster. At this point, the solid is melting to form a liquid.

Explanation:

The particles in the liquid are the same as in the solid but they have more energy.

On a relative basis, the weaker the intermolecular forces in a substance, the lower its boiling point and the higher its vapor pressure. Here, option A is the correct answer.

Intermolecular forces are the forces of attraction between molecules. They play a significant role in determining the physical properties of substances, such as boiling point, melting point, and vapor pressure. Strong intermolecular forces, such as hydrogen bonding or ion-dipole interactions, require more energy to overcome. As a result, substances with strong intermolecular forces tend to have higher boiling points because it takes more heat energy to break those forces and convert the substance from a liquid to a gas.

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complete question is below

on a relative basis, the weaker the intermolecular forces in a substance,

A.the lower its boiling point and the higher its vapor pressure.

B.the higher its vapor pressure.

The maximum possible efficiency for such an engine is 6.039 %.

Temperature of water near the surface of a tropical ocean = 298.2 K

Temperature of water 700 m beneath the surface = 280.2 K

To find the maximum possible efficiency for the given heat engine,

The maximum possible efficiency of a heat engine depends only on the temperatures of the hot and cold reservoirs, and is given by Carnot efficiency,  η = (T₁ - T₂)/T₁

whereT₁ is the temperature of hot reservoir, T₂ is the temperature of cold reservoir. Temperature is given in Kelvin.

The temperature difference between the hot and cold reservoirs is, T₁ - T₂ = 298.2 K - 280.2 K = 18 K

Substitute these values in the Carnot efficiency equation,

Carnot efficiency, η = (T₁ - T₂)/T₁ = (18 K)/298.2 K = 0.06039. The maximum possible efficiency for such an engine is 6.039 %.

Generalised function is given as η = (T₁ - T₂)/T₁

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Quantity of matter measured to know the weight is called mass, it can be measured in kilograms, grams and many other units. The mass of chalk used is 3.9 g.

Chalk is made up of calcium carbonate \((\rm CaCO_{3})\) and has some amount of weight called mass.

Given,

The total amount of the chalk used is calculated as:

Mass used = Initial mass - final mass

Substituting values in the above formula:

\(\begin{aligned}\text{Mass used} &= \text{Initial mass - final mass}\\\\&= 43.5 - 39.6 \\\\&= 3.90\;\rm gm\end{aligned}\)

Therefore, 3.9 gms of chalk is used.

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The  speed of the fallen tree from the hill in km/hr would be 46.4 km/hr.

simple unit conversion is applied here so, The problem here is about converting the speed of an object from one unit to another. Specifically, we are to convert from m/s to km/hr.

Speed is the function of distance and time. Thus, the distance needs to be converted to km from m and the time to hr from s.

13 m/s is equivalent to 13 m distance and 1 second time.

remember that:

1000 m = 1 km

13 m = 13/1000

 = 0.013 km

3600 seconds = 1 hr

1 second = 1/3600

  = 0.00028 hour

The speed of the fallen tree in km/hr will be then:

0.013/ 0.00028  = 46.4 km/hr

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According to  Le Châtelier's principle the equilibrium for the given reaction shifts towards right of the reaction.

Le Chatelier's principle states that "if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish an equilibrium". Basically if a chemical reaction is at the equilibrium and experiences a change in pressure, temperature, or concentration of products or reactants, the equilibrium generally shifts in the opposite direction towards the offset of the change.

The balanced chemical reaction is given as,

CH₃COOH ( aq ) + H₂O ( l ) ⇄ H₃O + ( aq ) + CH₃COO⁻

In the above chemical reaction equilibrium shifts towards right of the reaction.

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The correct answer is: a) NMDA-gated channels are permeable to both Na+ and Ca2+

AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) and NMDA (N-methyl-D-aspartate) receptors are two types of ion channels that respond to the neurotransmitter glutamate in the central nervous system. While both types of receptors are involved in mediating excitatory synaptic transmission, there are distinct differences between them.

One major difference is in their ion permeability. AMPA receptors are primarily permeable to sodium ions (Na+). When glutamate binds to AMPA receptors, it leads to the influx of sodium ions, which depolarizes the postsynaptic neuron and promotes the generation of an action potential.

On the other hand, NMDA receptors are unique in that they are permeable to both sodium ions (Na+) and calcium ions (Ca2+).

However, the permeability to calcium is voltage-dependent. NMDA receptors require two conditions to be met for them to open: the presynaptic neuron must release a sufficient amount of glutamate, and the postsynaptic neuron must be depolarized.

When these conditions are met, NMDA receptors allow the influx of both sodium and calcium ions. The calcium influx through NMDA receptors is particularly important in triggering intracellular signaling pathways and mediating long-term changes in synaptic strength, which can lead to lasting modifications in the postsynaptic neuron (option b).

Option c is incorrect because NMDA-gated channels are indeed permeable to calcium ions. Option d is also incorrect because the inward current through AMPA-gated channels is not voltage-dependent.

In summary, the key difference between AMPA and NMDA glutamate-gated channels lies in their ion permeability, with NMDA receptors being permeable to both sodium and calcium ions.

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Answer:

1.92

Explanation:

Answer:C

Explanation:

Because they use it so that they can find more information about it.

What scientists use to describe a constellation: C. It’s star pattern

A star is a giant astronomical or celestial object that comprises a luminous sphere of plasma and bounded together by its own gravitational force.

Generally, a star is typically made up of two (2) main hot gas and these are Hydrogen (H) and Helium (He).  Some examples of a star are;  

A galaxy can be defined as a collection (group) of many billions of stars, which are existing independently. Thus, the greatest number of stars are found in a galaxy.

A constellation can be defined as a collection (group) of visible stars forming a recognizable or perceived pattern in the sky. Also, this pattern or outline is sometimes attributed by scientists to a mythological figure.

In conclusion, scientists use the pattern of a star to describe a constellation.

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The pH at the equivalence point in the titration of 50.0 ml of 0.300 M CH₃COOH with 0.3 M NaOH is approximately 4.68.

To calculate the pH at the equivalence point, we need to determine the concentration of acetate ion (CH₃COO⁻) and hydronium ion (H³O⁺) at this point.

At the start of the titration, the initial concentration of acetic acid is 0.300 M and the initial concentration of hydronium ion is the same.

Let's say that x moles of NaOH are added to the solution. This will lead to the formation of x moles of acetate ion (CH³COO⁻) and x moles of hydroxide ion (OH⁻).

The final concentration of acetic acid will be (0.300 M - x M) and the final concentration of hydronium ion will be (x M).

The ionization constant (Ka) for acetic acid can be used to determine the concentration of acetate ion and hydronium ion in the solution. The equation for the ionization of acetic acid is:

CH₃COOH + H₂O ↔ CH₃COO⁻ + H₃O⁺

Ka = [CH₃COO⁻][H₃O⁺] / [CH₃COOH]

At the equivalence point, [CH₃COOH] = (0.300 M - x M), [CH₃COO⁻] = x M, and [H₃O⁺] = x M. Substituting these values into the equation for Ka, we get:

1.8 x 10⁻⁵ = (x)(x) / (0.300 - x)

Solving for x, we get:

x = 2.1 x 10⁻⁵ M

The pH at the equivalence point is equal to the negative log of the hydronium ion concentration:

pH = -log[H₃O⁺] = -log(2.1 x 10⁻⁵) = 4.68

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Answer:

Explanation:

A perfect diamond is a single molecule made of carbon atoms.

DNA is a super long molecule that has information uniquely describing every human being.

When two or more atoms chemically bond together, they form a molecule.

They are very small in size.

They have space between them.

They are in constant random motion.

molecules move when Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.

In 1926, French physicist Jean Perrin received the Nobel Prize in physics for proving, conclusively, the existence of molecules.

Molecules can exist in free state because they are very stable.

The smallest particle of a compound capable of existing on its own is a Molecule-not a atom.

We would know from the appearance of the samples if they belong to the kind of substances

The question is incomplete but I will show you how to know if all the substances that are shown belong to one substance.

If two substances have the same chemical formula, then they are the same type of substance. So we have to look at the appearance that stand for the substances and that we tell us if we are dealing with the same type of substances or not as we can see here.

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The color of phenolphthalein indicator in an acidic medium is colorless, while in a basic medium it turns pink or magenta.

Phenolphthalein is a commonly used pH indicator that changes color depending on the acidity or basicity of the solution it is in.

In an acidic medium, which has a low pH, phenolphthalein remains colorless. This is because the acidic environment prevents the phenolphthalein from undergoing a chemical reaction that would result in a color change.

On the other hand, in a basic medium with a high pH, phenolphthalein turns pink or magenta. This is because the basic environment allows the phenolphthalein molecules to undergo a chemical reaction, causing them to turn pink or magenta.

It's important to note that the exact pH at which the color change occurs can vary depending on the concentration of the phenolphthalein solution and the specific experimental conditions. However, the general trend is that phenolphthalein is colorless in acidic conditions and pink/magenta in basic conditions.

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The heat capacity of the calorimeter is approximately -6.808 kJ/°C.

To determine the heat capacity of the calorimeter, we need to use the heat released during the combustion of benzoic acid and the temperature change observed in the calorimeter.

First, let's calculate the heat released during the combustion of benzoic acid.

Mass of benzoic acid (C6H5COOH) = 0.9862 g

Molar mass of benzoic acid = 122.12 g/mol

Number of moles of benzoic acid = mass / molar mass

= 0.9862 g / 122.12 g/mol

= 0.00808 mol

Enthalpy change during combustion of benzoic acid = -3226.7 kJ/mol

Heat released during the combustion of benzoic acid = enthalpy change * number of moles

= -3226.7 kJ/mol * 0.00808 mol

= -26.091 kJ

Next, let's calculate the temperature change in the calorimeter.

Initial temperature (T1) = 21.84 °C

Final temperature (T2) = 25.67 °C

Temperature change (ΔT) = T2 - T1

= 25.67 °C - 21.84 °C

= 3.83 °C

Now, we can use the heat released during combustion and the temperature change to calculate the heat capacity of the calorimeter.

Heat capacity of the calorimeter = Heat released / Temperature change

= -26.091 kJ / 3.83 °C

Since the heat capacity is typically expressed in kJ/°C, the units of kJ and °C cancel out.

Heat capacity of the calorimeter ≈ -6.808 kJ/°C

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A dipole moment is the development of a  positive end and a negative end within a bond due to the sharing of electrons.

All atoms include this stable subatomic particle, which serves as the main electrical conductor in solids. It has a charge of negative electricity.

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Answer:

Approximately 7.65

Explanation:

math.

skillz.

According to the ionic bonding model, the compound with the highest melting point is likely to be the one with the strongest ionic bonds.

In the ionic bonding model, compounds form when there is a transfer of electrons from one element to another, resulting in the formation of positive and negative ions. The strength of the ionic bond is influenced by factors such as the charges and sizes of the ions involved.

Among the given compounds, MgO (magnesium oxide) is expected to have the highest melting point. This is because magnesium (Mg) is a metal that tends to lose two electrons and form a 2+ cation, while oxygen (O) is a nonmetal that tends to gain two electrons and form a 2- anion. The resulting Mg2+ and O2- ions have strong electrostatic attraction due to the opposite charges. This strong ionic bond requires a significant amount of energy to break, leading to a high melting point for MgO.

On the other hand, compounds like AlN (aluminum nitride), NaCl (sodium chloride), CaS (calcium sulfide), and RbI (rubidium iodide) also exhibit ionic bonding but with different ion sizes and charges. While these compounds have varying degrees of ionic bonding strength, they are expected to have lower melting points compared to MgO.

In conclusion, based on the ionic bonding model, MgO (option B) is likely to have the highest melting point among the given compounds due to its strong ionic bond resulting from the combination of a 2+ metal cation and a 2- nonmetal anion.

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Answer:

1. V2.

2. 299K.

3. 451K

4. 0.25 x 451 = V2 x 299

Explanation:

1. The data obtained from the question include:

Initial volume (V1) = 0.25mL

Initial temperature (T1) = 26°C

Final temperature (T2) = 178°C

Final volume (V2) =.?

2. Conversion from celsius to Kelvin temperature.

T(K) = T (°C) + 273

Initial temperature (T1) = 26°C

Initial temperature (T1) = 26°C + 273 = 299K

3. Conversion from celsius to Kelvin temperature.

T(K) = T (°C) + 273

Final temperature (T2) = 178°C

Final temperature (T1) = 178°C + 273 = 451K

4. Initial volume (V1) = 0.25mL

Initial temperature (T1) = 299K

Final temperature (T2) = 451K

Final volume (V2) =.?

V1 x T2 = V2 x T1

0.25 x 451 = V2 x 299