Math and science skills




Please answer


1.
|Predict|
2.
|Use variables|
3.
|Plan and conduct investigations|
4.
Draw conclusions
5.
Hypothesize
6.
Measure
7.
Classify and order
8.
Record and display data
9.
|Use time and space relationships|
10.
Use numbers

Answers

Answer 1

Answer:6

Explanation:


Related Questions

During the displacement reaction a student observe that the metal P can displace Q from its salt solution. But Q cannot displace R from its salt solution. Based on the above observation a) Name the most reactive metal. b) Name the salt formed when P displace Cu from CuSO 4 solution.

Answers

Answer:

See the answer below

Explanation:

P can displace Q from its salt solution means that P is more reactive than Q.

Q cannot displace R from its salt solutions means that R is more reactive than Q.

a) There is no information as to which of P and R has the capacity to displace one another from their salt solutions. Hence, the most reactive metal can be either of P and R.

b) When P displaces Cu from CuSO4 solution, the equation can be represented below (assuming that P is monoatomic):

\(P + CuSO_4 --> P_2SO_4 + Cu\)

Hence, the product formed is \(P_2SO_4\)

Physical, Chemical, or Therapeutic Incompatibility?:
Antagonism between tetracycline and penicillin.

Answers

The antagonism between tetracycline and penicillin is an example of therapeutic incompatibility.

Therapeutic incompatibility occurs when the effect of one drug is diminished or counteracted by the presence of another drug in the system. In this case, tetracycline and penicillin have different modes of action. Tetracycline is a bacteriostatic antibiotic, which means it inhibits the growth and reproduction of bacteria, while penicillin is a bactericidal antibiotic that actively kills bacteria.

When both drugs are administered together, the bacteriostatic effect of tetracycline can reduce the effectiveness of penicillin, as penicillin works best on actively growing bacteria.

Due to the different modes of action, the antagonism between tetracycline and penicillin results in therapeutic incompatibility, which may reduce the overall effectiveness of the treatment. It is crucial to consider this interaction when prescribing these antibiotics together.

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A student believes that a solution of potassium chromate should be insoluble
because chromate ions form insoluble compounds. Explain why the student is
incorrect.

Answers

Answer:

All ionic compounds with alkali metals are soluble.

Explanation:

Certain elements always form soluble substances. Most of those elements are alkali metals/group 1 metals.

5. __Li3N + NH4NO3 →_LINO3 + __(NH4)3N

Answers

Answer: Li3N + 3 NH4NO3 → 3 LiNO3 + (NH4)3N

Explanation:

This is a type of double displacement reaction.

Here, on the reactant side, we have 3 Li, 1 N, 1 NH4, and 1 NO3.

On the product side, we have 1 Li, 1 N, 3 NH4, and 1 NO3.

To balance the two sides, we have to equal the number of atoms of Li and NO4. Thus, we get:

⇒ Li3N + 3 NH4NO3 → 3 LiNO3 + (NH4)3N

what are the factors affecting gravity?​

Answers

Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

Mass: The most significant factor affecting gravity is the mass of the objects involved. According to Newton's law of universal gravitation, the gravitational force between two objects is directly proportional to the product of their masses. Greater mass leads to a stronger gravitational force.Distance: The distance between two objects also plays a crucial role in the strength of gravity. According to the inverse square law, the gravitational force decreases as the distance between objects increases. As objects move farther apart, the gravitational attraction between them weakens.Gravitational Constant: The gravitational constant, denoted by G, is a fundamental constant in physics that determines the strength of the gravitational force. It is a universal constant and does not change, affecting the overall magnitude of gravity.Shape and Distribution of Mass: The distribution of mass within an object can influence the gravitational field it generates. Objects with a more compact and concentrated mass distribution will have a stronger gravitational pull compared to those with a more spread-out mass distribution.External Influences: Gravity can be influenced by external factors such as nearby celestial bodies or the presence of other forces. For example, the gravitational interaction between the Earth and the Moon affects tides on Earth's surface.

if 3.95 mol of an ideal gas has a pressure of 2.33 atm and a volume of 60.87 l, what is the temperature of the sample in degrees celsius? g

Answers

If 3.95 mol of an ideal gas has a pressure of 2.33 atm and a volume of 60.87 l, 164.65 temperature of the sample in degrees Celsius.

T=PV/nR

T= 2.33*60.87/3.95*0.082 atms

T=437.8

Convert the temperature of sample from K to С = k-273.15

C=437.8-273.15

⁰C=164.6

The temperature of the sample is 164.6⁰С

The relationship between temperature and pressure for a given volume of gas is straightforward. Pressure increases in systems when temperature increases and vice versa. The Gay-law Lussac's specifies the link between a gas's pressure and temperature. Air pressure is the result of molecules colliding and air pressing against its surroundings. The difference between temperature and air density is how many molecules there are in a given volume of air.

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Consider the reaction below.
21 (aq) + Cl₂(g) →→2C1¯(aq) +12(aq)
Which half reaction correctly describes the reduction that is taking place?
O Cl2(g) +2e2C1(aq)
O Cl2(g) + e->2Cl¯ (aq)
O2 (aq)12(aq) + 2e¯
21 (aq) 12(aq) + e¯

Answers

2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

What is Reduction Half Reaction ?

The half reaction of overall reaction in which reactants gain its electrons during the reaction is called Reduction Half Reaction.

What is Oxidation Half Reaction ?

The half reaction of overall reaction in which reactant loses electrons during the reaction is called Oxidation Half Reaction.

The given reaction is

2I⁻ (aq) + Cl₂ (aq) → 2Cl⁻ (aq) + I₂ (aq)

Reduction Half Reaction: 2Cl + 2e⁻ → 2Cl⁻

Oxidation Half Reaction: 2I⁻ - 2e⁻ → 2I

Here Cl₂ is an oxidizing agent and I⁻ is reducing agent.

Thus from the above conclusion we can say that 2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

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The ability of a substance to conduct electricity is called_______​

Answers

Answer:

Electrical conductivity

Explanation:

Electrical conductivity - A material's ability to conduct electricity

Which soil develops in the wettest climate?

Answers

Answer:

Prairie

Explanation:

because it grows in the same type of climate, its amount of humus.  sorry if its wrong I am not good with chem but i hope its right :)

the gram staining procedure is best described as a(n) __ staining technique.

Answers

Answer:

differential

Explanation:

According to openstax.org, "Gram-staining is a differential staining technique that uses a primary stain and a secondary counterstain to distinguish between gram-positive and gram-negative bacteria."

Which of the following metals is most reactive?
a. Mg
b. Rb
c. Cs
d. Li

Answers

the answer would be c :)

The item that is not normally used in preparing
a slide is
A. medicine dropper
B. scissors
C. slip cover
D vereis


Answers

Answer:

What is the name of the lab tool that is used to transfer a sample to a microscope slide?

A-a dropper

B-forceps

C-scissors

D-a ruler

Explanation:

got it wrong but this is the answer edg 2021

In the preparation of a microscopic slide, the items which are used are medicine dropper, scissors, and a slip cover. Thus, the correct option is D.

What is a microscopic slide?

Microscope slides are made for the purpose of observations of different objects. After the observation, the slides are discarded. In most cases, the slides use a liquid mounting medium such as water or glycerin.

The procedure for the preparation of the slide is as follows:

1. Place a drop of liquid mounting medium in the center of the slide.

2. Position the sample on liquid with the use of tweezers.

3. At an angle, place one side of the cover slip against the microscopic slide making contact with outer edge of the liquid drop.

4. Lower the cover slip slowly, avoiding air bubbles.

5. Remove the excess water present in it with the help of paper towel.

Therefore, the correct option is D.

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explain why aspirin contains 4 peaks in the aromatic region of the spectrum.

Answers

Because it possesses a phenyl ring in its structure, aspirin has four peaks in the aromatic part of the spectrum.

Aspirin contains four peaks in the aromatic region of the spectrum because it has a phenyl ring in its structure. The phenyl ring is an aromatic compound, which means it has a specific type of bonding that creates a ring of electrons. This ring is highly stable and gives the compound its characteristic smell or "aromatic" nature. The peaks in the spectrum correspond to the different types of hydrogen atoms attached to the phenyl ring. The four peaks represent the different types of protons (hydrogen atoms) on the ring, each with a different chemical shift, resulting in four separate signals in the NMR spectrum. This is a common feature of many aromatic compounds and is due to the nature of their electronic structure.

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Which of the following is true about a hypothesis that is proven to be inaccurate? WILL GIVE BRAINLIEST FOR CORRECT ANSWER!!

A. An inaccurate hypothesis is not valuable.

B. It allows the scientist to eliminate any possibility of a relationship between two variables.

C. It will provide information to help formulate a new hypothesis in the future.

D. It proves that the exact opposite of the hypothesis is true.

Answers

Answer:

C. It Will Provide information to help formulate a new hypothesis in the future.

Explanation:

I had AP Chemistry.

The following statement that it will provide information to help formulate a new hypothesis in the future is  true about a hypothesis that is proven to be inaccurate.

What is hypothesis?

Hypothesis can be defined as an assumption which is made for the sake of argument . It is an interpretation of a practical condition for which action needs to be taken.It is defined as a tentative assumption which is made to test logical consequences.It is an antecedent clause of a statement which is conditional.

It is constructed before research. There are six types of hypothesis 1)simple hypothesis 2) complex hypothesis 3) directional hypothesis 4)non-directional hypothesis 5) null hypothesis 6)casual hypothesis

The hypothesis should be clear and precise, it must be specific and way of explanation of hypothesis should be simple.

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Explain the mechanism of a Horner-Wadsworth-Emmons reaction between diethyl benzylphosphonate and 3,4-methylenedioxybenzaldehyde in the presence of aqueous NaOH forming 3,4-methylenedioxystilbene as the product.

Answers

Horner-Wadsworth-Emmons (HWE) reaction is an important synthetic reaction in organic chemistry. It is widely used for synthesizing various compounds. The reaction is between an aldehyde or ketone and a phosphonate or phosphonate ester in the presence of a strong base.

The Horner-Wadsworth-Emmons reaction is one of the most convenient and well-known methods of constructing carbon-carbon double bonds. The reaction proceeds via the formation of an ylide intermediate. The HWE reaction is particularly useful for the synthesis of compounds with a Z-configuration.

The mechanism for the reaction of diethyl benzylphosphonate and 3,4-methylenedioxybenzaldehyde in the presence of aqueous NaOH, forming 3,4-methylenedioxystilbene as the product, can be explained in the following steps:

Step 1: Formation of the ylide intermediate

The reaction starts with the formation of an ylide intermediate. This is achieved by the reaction of diethyl benzylphosphonate and 3,4-methylenedioxybenzaldehyde in the presence of a strong base like NaOH or KOH. In this reaction, a deprotonated species called an ylide intermediate is generated.

Step 2: Addition of the ylide intermediate to the aldehyde

The ylide intermediate then attacks the aldehyde, leading to the formation of a betaine intermediate.

Step 3: Formation of the phosphonate ester

The betaine intermediate undergoes elimination to form the final product, 3,4-methylenedioxystilbene, and the by-product phosphonate ester.

The mechanism of the Horner-Wadsworth-Emmons (HWE) reaction between diethyl benzylphosphonate and 3,4-methylenedioxybenzaldehyde in the presence of aqueous NaOH, forming 3,4-methylenedioxystilbene as the product, is complete. This reaction is significant in organic chemistry and finds applications in the pharmaceutical industry.

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a pot contains 3 l of brine at a concentration of 80 g/l. how much of the water should be boiled off to increase the concentration to 200 g/l?

Answers

To increase the concentration of the brine from 80 g/L to 200 g/L, we need to boil off some of the water in the pot. This will decrease the volume of the solution while keeping the amount of salt the same, thereby increasing the concentration. We can use the formula C1V1 = C2V2 to find the new volume of the solution.

C1 = initial concentration = 80 g/L
V1 = initial volume = 3 L
C2 = final concentration = 200 g/L
V2 = final volume = ?

Plug in the values into the formula and solve for V2:
80 g/L × 3 L = 200 g/L × V2
240 g = 200 g/L × V2
V2 = 240 g / 200 g/L
V2 = 1.2 L

Therefore, the final volume of the solution should be 1.2 L. To find the amount of water that should be boiled off, we can subtract the final volume from the initial volume:
3 L - 1.2 L = 1.8 L

So, 1.8 L of water should be boiled off to increase the concentration of the brine to 200 g/L.

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spotting a specimen on a silica-coated glass plate and calculating the retention factor for migrated substances in a sample is referred to as tlc. what type of chromatography is this

Answers

The type of chromatography described, where a specimen is spotted on a silica-coated glass plate and the retention factor for migrated substances is calculated, is called Thin-Layer Chromatography (TLC).

TLC is a chromatographic technique used to separate and analyze mixtures of compounds. In TLC, a thin layer of adsorbent material, such as silica gel or alumina, is coated onto a glass or plastic plate. The specimen is applied as a spot near the bottom of the plate, and the plate is then placed in a solvent system. As the solvent moves up the plate through capillary action, the different components of the mixture will migrate at different rates, resulting in separation. The retention factor (Rf) is a ratio that represents the distance traveled by the compound divided by the distance traveled by the solvent front and is used to identify and characterize the components in the mixture.

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PLS HELP ASAP I NEED HELP IMAGE BELOW

PLS HELP ASAP I NEED HELP IMAGE BELOW

Answers

I think it would be 1, 4, 5! Also I love your profile picture!

Answer:

1, 4, 5 are the correct answers

Explanation:

Hope this helps! :D

what are some of the Differces between normal cells and cancer cells?

Answers

Answer:

Normal cells are either repaired or die (undergo apoptosis) when they are damaged or get old. Cancer cells are either not repaired or do not undergo apoptosis.

Explanation:

which standard iv solution has an osmolarity of approximately 150 mosm?

Answers

A standard IV solution with an osmolarity of approximately 150 mosm is a 0.9% (w/v) sodium chloride (NaCl) solution.

Osmolarity is a measure of the concentration of solute particles in a solution per unit volume. In the context of IV solutions, osmolarity is an important parameter to ensure compatibility with the patient's body fluids.

A 0.9% (w/v) NaCl solution, also known as normal saline or physiological saline, is commonly used as a standard IV solution. This solution is prepared by dissolving 0.9 grams of NaCl in 100 mL of water.

To determine the osmolarity of the solution, we need to calculate the number of moles of NaCl and then convert it to osmoles.

The molar mass of NaCl is 58.44 g/mol. By calculating the moles of NaCl in the 0.9% solution, we have:

Moles of NaCl = (0.9 g / 58.44 g/mol) = 0.0154 mol

Since each NaCl molecule dissociates into two ions (Na⁺ and Cl⁻) in solution, the total number of solute particles is doubled:

Total osmoles = 2 × Moles of NaCl = 2 × 0.0154 mol = 0.0308 osmoles

Since the osmolarity is expressed per liter of solution, we need to convert the osmoles to mosmoles (osmoles per liter):

Osmolarity = Total osmoles / Volume of solution

Assuming a volume of 1 liter, the osmolarity is 0.0308 mosmoles/L = 30.8 mosm.

Therefore, to achieve an osmolarity of approximately 150 mosm, the 0.9% NaCl solution is commonly used as a standard IV solution.

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What is the decay mode of radium-226?

Answers

Answer:

Radium-226 is a radioactive decay product in the uranium-238 decay series and is the precursor of radon-222. Radium-228 is a radioactive decay product in the thorium-232 decay series. Both isotopes give rise to many additional short-lived radionuclides, resulting in a wide spectrum of alpha, beta and gamma radiations.

The table shows the nature of the reactants and products formed in a certain type of chemical reaction. Nature of Reactants and Products Reactants Products Ionic compound + Ionic compound Ionic compound + Ionic compound Which of the following is true about this type of chemical reaction? (4 points) Group of answer choices It is a single replacement reaction, and all four compounds are different. It is a double replacement reaction, and all four compounds are different. It is a single replacement reaction, and each compound has the same set of ions. It is a double replacement reaction, and each compound has the same set of ions.

Answers

The given reaction is a double replacement reaction; option B.

What is a chemical reaction?

A chemical reaction is a reaction in which chemical changes occurs in the atoms of reactants which results in the formation pf products.

The given reaction is as follows:

Ionic compound + Ionic compound ---> Ionic compound + Ionic compound

Since exchange of ions occur, it is a double replacement reaction.

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Pls help thank you I would really appreciate it

Pls help thank you I would really appreciate it

Answers

Answer:

Explanation:

3618

When might Accurate length measurement be important?​

Answers

Answer:

When you are going to measure small lengths or objects or when you are going to measure things with great accuracy.

Explanation:

A monatomic gas and a diatomic gas have equal numbers of moles and equal temperatures. Both are heated at constant pressure until their volume doubles. What is the ratio �
diatomic /

monatomic Q diatomic ​
/Q monatomic ​
?

Answers

The ideal monatomic molecule has three degrees of freedom, thus let N=the total number of molecules in each gas maintained at temperature T.

Hence, the monatomic gas's typical kinetic energy  E₁=(3/2) Nkt

, then its heat capacity at constant volume,

\(e1=\frac{3}{2} nKt\)

. [k= Boltzman constant]

Similarly, for the diatomic gas

Cv₂=5/2Nk

as 5 degrees of freedom are available to a diatomic molecule.

Now, each of the gases receives a certain quantity of energy E in the form of heat. If T₁ and T₂ are the corresponding temperature increases, then

E=Cv₁T₁=Cv₂T₂,

or,

T₁/T₂=Cv₂/Cv₁ = 5/3

So,

T1>T2

this monatomic gas will be more heated.

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The ratio of the final volumes is 1:1

The ratio of the final volume of the diatomic gas to that of the monatomic gas can be found using the ideal gas law, which relates pressure, volume, number of moles, and temperature:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = the gas constant

T = temperature

Since the gases are at the same temperature and have the same number of moles, their ratio of volumes will depend only on the ratio of their pressures.

Let's consider the monatomic gas first. Since the pressure is constant during heating, we can write:

P₁V₁ = nRT₁

After doubling the volume, the new volume is 2V₁, and we can write:

P₂(2V₁) = nRT₂

where P₂ is the new pressure and T₂ is the final temperature of the gas.

Dividing the second equation by the first equation, we get:

P₂(2V₁) / (P₁V₁) = nRT₂ / nRT₁

Canceling out n and rearranging the terms, we get:

P₂ / P₁ = (2V₁ / V₁) * (T₂ / T₁)

P₂ / P₁ = 2(T₂ / T₁)

Similarly, for the diatomic gas, we have:

P₃V₃ = nRT₁

P₄(2V₃) = nRT₂

Dividing the second equation by the first equation, we get:

P₄ / P₃ = (2V₃ / V₃) * (T₂ / T₁)

P₄ / P₃ = 2(T₂ / T₁)

Since both gases have the same number of moles and are heated at constant pressure, their initial pressures are the same (P₁ = P₃). Therefore, the ratio of the final pressures is:

P₂ / P₄ = (P₂ / P₁) * (P₃ / P₄) = 1 * (P₃ / P₄) = P₃ / P₄

Substituting the expressions we found for P₂ / P₁ and P₄ / P₃, we get:

P₃ / P₄ = (2(T₂ / T₁)) / (2(T₂ / T₁)) = 1

Therefore, the ratio of the final volumes of the diatomic gas to the monatomic gas is:

(2V₃) / (2V₁) = V₃ / V₁ = P₃ / P₁ = 1

So the ratio of the final volumes is 1:1. This means that both gases will occupy the same volume after being heated at constant pressure until their volume doubles, as long as they have the same number of moles and the same initial temperature.

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If it is in group _______ or group ________, the element ____________________________or is a ____________________________________________, then the compound is ionic.

Answers

If it is in group 1 or group 7 (or any group higher than 7), the element is a metal or is a non-metal, then the compound is ionic.

What is ionic ?

Ionic chemistry is the study of how atoms and molecules interact with each other through the transfer of electrons. It involves the transfer of ions, which are atoms or molecules that have gained or lost an electron. These ions interact with each other to form ionic compounds, which are composed of ionic bonds. These bonds are formed by the attraction between the positive and negative charges of the ions.

This is because ions form when atoms of a metal lose electrons to a non-metal in order to achieve a full outer shell of electrons. Group 1 elements tend to lose one electron, while group 7 elements tend to gain seven electrons.

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50 POINTS

a 6.7g piece of rock boiled to 100.0 degrees celsius is placed in 100.0 mL of water with an initial temperature of 23 degrees celsius. the equilibrium temperature when the rock is added is 45 degrees celsius. what is the specific heat of the rock?

Answers

To solve this problem, we can use the equation:

q = m * c * ΔT

where q is the heat absorbed or released, m is the mass of the substance, c is the specific heat of the substance, and ΔT is the change in temperature.

In this case, the heat released by the rock is equal to the heat absorbed by the water, so we can write:

q_rock = -q_water

where q_rock is the heat released by the rock and q_water is the heat absorbed by the water.

The heat released by the rock can be calculated as:

q_rock = m_rock * c_rock * ΔT

where m_rock is the mass of the rock and c_rock is the specific heat of the rock. We know that the mass of the rock is 6.7 g and the ΔT is 45 - 100 = -55 degrees Celsius (because the rock is losing heat to the water).

The heat absorbed by the water can be calculated as:

q_water = m_water * c_water * ΔT

where m_water is the mass of the water and c_water is the specific heat of water. We know that the mass of the water is 100.0 g (which is equivalent to 100.0 mL) and the ΔT is 45 - 23 = 22 degrees Celsius (because the water is gaining heat from the rock).

Since q_rock = -q_water, we can set the two equations equal to each other and solve for c_rock:

m_rock * c_rock * ΔT = -m_water * c_water * ΔT

c_rock = -m_water * c_water * ΔT / (m_rock * ΔT)

Plugging in the values, we get:

c_rock = -(100.0 g) * (4.184 J/g°C) * (22°C) / [(6.7 g) * (-55°C)]

c_rock = 0.811 J/g°C

Therefore, the specific heat of the rock is 0.811 J/g°C.

Answer:

To calculate the specific heat of the rock, you can use the formula for heat transfer: Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity and ΔT is the change in temperature.

In this case, we can assume that the heat lost by the rock is equal to the heat gained by the water. Therefore:

Q(rock) = Q(water)

m(rock)c(rock)(T(final) - T(initial, rock)) = m(water)c(water)(T(final) - T(initial, water))

where m(rock) = 6.7 g, T(initial, rock) = 100.0°C, T(final) = 45°C, m(water) = 100.0 g (assuming the density of water is 1 g/mL), c(water) = 4.18 J/g°C (specific heat capacity of water), and T(initial, water) = 23°C.

Substituting these values into the equation above and solving for c(rock), we get:

c(rock) = (m(water)c(water)(T(final) - T(initial, water))) / (m(rock)(T(final) - T(initial, rock)))

c(rock) = (100.0 g * 4.18 J/g°C * (45°C - 23°C)) / (6.7 g * (45°C - 100.0°C))

c(rock) ≈ 1.26 J/g°C

So the specific heat of the rock is approximately 1.26 J/g°C.

11.All of the following properties of a diamond are physical except...Select one:a. It does not conduct electricity.b. It produces carbon dioxide when burned in pure oxygen.c. It is transparent like glass.d. It is the hardest material.

Answers

Answer

b. It produces carbon dioxide when burned in pure oxygen.

Explanation

The reaction between diamond and oxygen, producing carbon dioxide is not a physical property of diamond, it is a chemical property because breaking and synthesis of chemical bonds occur.

What is the pH of a 2.20 M solution of the weak acid CH3CO2H, given that the Ka of the acid is 1.76×10−5? The equilibrium expression is:

CH3CO2H(aq)+H2O(l)⇋H3O+(aq)+CH3CO−2(aq)

Answers

The pH of the 2.20 M solution of the weak acid CH3CO2H can be calculated using the equilibrium expression and the dissociation constant (Ka) of the acid.

What is the pH of the solution?

To determine the pH of the solution, we need to consider the dissociation of the weak acid CH3CO2H. The equilibrium expression shows the formation of H3O+ ions (hydronium ions) and CH3CO−2 ions (acetate ions) from the dissociation of CH3CO2H in water.

The Ka value represents the acid dissociation constant and is given as 1.76×10−5. This value indicates the degree of dissociation of the acid. Since the acid is weak, it only partially dissociates, and we can assume that the initial concentration of CH3CO2H remains relatively unchanged.

To find the pH, we need to determine the concentration of H3O+ ions. Since CH3CO2H is a weak acid, we can approximate the concentration of H3O+ ions to be equal to the concentration of the acid that dissociates. Therefore, the concentration of H3O+ ions is approximately 2.20 M.

Using the equation pH = -log[H3O+], we can calculate the pH of the solution.

In this case,

\(pH = -log(2.20) = -log(2.20) = 0.657.\)

Therefore, the pH of the 2.20 M solution of CH3CO2H is approximately 0.657.

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which solution is a buffer? hcl(aq) and nacl(aq) nacl(aq) and naoh(aq) h2so4(aq) and h2so3(aq) hf(aq) and naf(aq)

Answers

The solution of HF(aq) and NaF(aq) is a buffer.

A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The presence of both the weak acid and its conjugate base (or weak base and its conjugate acid) allows the buffer solution to maintain a relatively stable pH. Among the options provided, the solution of HF(aq) and NaF(aq) is a buffer.

HF is a weak acid, and NaF is the salt of its conjugate base. When these two substances are mixed together in water, they form a buffer system that can resist changes in pH. On the other hand, HCl(aq) and NaCl(aq), NaCl(aq) and NaOH(aq), and H2SO4(aq) and H2SO3(aq) are not buffer solutions because they do not contain a weak acid and its conjugate base (or weak base and its conjugate acid) in the appropriate ratios to maintain a stable pH. Therefore, the correct answer is option D: HF(aq) and NaF(aq) as it forms a buffer system.

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