A buffer solution is composed of 8.50 mol of acid and 2.25 mol of the conjugate base. if the pa of the acid is 4.20 , what is the ph of the buffer?

In scientific investigations, the effect of fertilizer on plant growth can be studied by examining various variables. Two key variables in this context are the presence or absence of fertilizer (independent variable) and the size or growth of the plant (dependent variable).

When investigating the effect of fertilizer on plant growth, the independent variable is the presence or absence of fertilizer. This variable is controlled by having two groups of plants: one group receiving fertilizer (experimental group) and another group without fertilizer (control group). By comparing the growth of these two groups, we can determine the impact of fertilizer on plant size.

The dependent variable, on the other hand, is the size or growth of the plant. This variable is measured or observed as the outcome of interest. In this case, it would be the height, weight, or overall size of the plants.

By systematically changing the independent variable (presence or absence of fertilizer), we can observe how it affects the dependent variable (plant growth). The experimental group receiving fertilizer is expected to show greater plant growth compared to the control group without fertilizer. This allows us to draw conclusions about the effect of fertilizer on plant growth.

However, it is important to note that the specific outcome may vary depending on other factors such as plant species, soil conditions, and environmental factors. Conducting a controlled experiment while considering these factors helps in obtaining more reliable results.

learn more about fertilizer here

https://brainly.com/question/14012927

#SPJ11

Volume of Argon = 59.972 L

In general, the gas equation can be written  

\(\large {\boxed {\bold {PV = nRT}}}\)

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

At STP(0 C, 1 atm), 1 mol gas= 22.4 L

so for 20 L

\(\tt \dfrac{20}{22.4}=0.893\)

For Argon

P = 1 atm

T = 273 K x 3 =819 K (tripled)

n = 0.893 (the same number of moles)

R = 0.082 L/atm.mol K

\(\tt V=\dfrac{nRT}{P}=\dfrac{0.893\times 0.082\times 819}{1}=59.972~L\)

Answer:

It would be this below.

Explanation:

I am not 100% sure this is write but I did my best this is still kinda hard for me. I just did this a few years ago and i struggled with it but I have been doing better since then.

Hope this helps :))

Answer:

B.) SnO and SnO₂

Explanation:

Tin can either exist as Sn²⁺ or Sn⁴⁺ when ionized. Oxygen always exists as O²⁻ when ionized.

When ions combine, sometimes there needs to be different amounts of each ion in order to create an overall charge of 0. In one combination of the ions (Sn²⁺ and O²⁻), there only needs to be one atom of each ion. In another combination (Sn⁴⁺ and O²⁻), you need to have more anions to balance the high positive charge of the cation.

SnO
-----> Sn²⁺ and O²⁻

-----> +2 + (-2) = 0

SnO₂

-----> Sn⁴⁺ and O²⁻

-----> +4 + (-2) + (-2) = 0

Answer: It is possible that the seller's claims about the bone being a genuine dinosaur bone and being 400 million years old are true. However, without additional evidence or verification from independent scientists, it is also possible that the bone is not authentic or that the carbon dating results have been manipulated or misinterpreted. It is important to be skeptical and to conduct further research before making a decision about the authenticity of the bone. Additionally, it is important to consider the source of the bone and the seller's reputation and credentials. It would be wise to seek out additional opinions from experts in the field before making a decision about the authenticity of the bone.

Answer:

Boiling the subtance

Explanation:

To determine the nature of an unknown liquid the first thing you can do is boil it:

* If the sample is water, the boiling point must be near to 100°C

*When all pure water is evaporated, there is no residue, the glass must be empty.

* But if the sample is salt water, when all water is evaporated, you will see a solid white residue that, possibly, is salt.

Jennifer has a jar full of stones. For one year, Jennifer shakes the jar several times each day. The illustration below shows the changes that occurred after one year, and this shows that because of the fragmentation, this happens.

Initially, before a year, there were many rocks, but as she continuously shrank the box, that led to the fragmentation. Due to vibration for a long time, the larger rocks break into the smaller particles as a result of the amount of rocks converted into the small particles and sands. These smaller stone fragments may then accumulate at the bottom of the jar as a result of this there is a decrease in the overall number of stones in the jar.

Learn more about the rock fragments here

https://brainly.com/question/30182426

#SPJ2

The numerical value of x is 4 for the elements belonging to group 16.

The outermost shell or orbital of an atom is called its valence shell. The electrons in these shells take part in bonding with other atoms. It may be fully filled or half-filled. The group 16 elements have the general electronic configuration ns2 npx. The general valence electron configuration of group 16 elements is ns2 np4. Group 16 elements have six electrons in their valence shell. Thus, the value of x=4.

The group 16 elements are oxygen (O), Sulfur (S), Selenium (Se), Tellurium (Te), Polonium (Po) etc.

Thus, the valence electrons will be same for the elements is ns2 np4 and therefore the numerical value of x is 4.

To learn more about valence electrons check the ink below:

https://brainly.com/question/371590

#SPJ4

The B: oxygen in O2 is oxidized in the given redox reaction. In a redox reaction, oxidation is the loss of electrons, while reduction is the gain of electrons. In the given reaction, oxygen gains electrons from sulfur, which means oxygen undergoes reduction. At the same time, sulfur loses electrons to oxygen, which means sulfur undergoes oxidation. Therefore, the element that is oxidized in this reaction is sulfur.

To describe the answer more accurately, it should be noted that the question is asking about which element is oxidized, not which compound or molecule. The reactants in the reaction are 2 molecules of H2S and 1 molecule of O2, and the products are 2 molecules of H2O and 1 molecule of S. It is the oxygen in O2 that is oxidized, as it gains electrons during the reaction.

learn more about redox reaction

https://brainly.com/question/21851295

#SPJ11

Answer:

Substances that are used up in a reaction.

Explanation:

E.g In the Scientific equation Sodium +Chlorine=Sodium Chloride, Sodium and Chlorine are the reactants and the product is Sodium Chloride.

Hope this helps

The law of diminishing marginal rate of substitution indicates that the rate at which one input can be substituted for another decreases as the quantity of one input increases, leading to isoquants being bent toward the origin.

In other words, as the quantity of one good increases, the individual is willing to sacrifice fewer units of the other good to obtain an additional unit of the first good. This reflects a diminishing rate of substitution between the two goods.

The reason why the law of diminishing marginal rate of substitution suggests that isoquants must be bent toward the origin is rooted in the concept of diminishing marginal utility. As more units of a particular input (e.g., labor or capital) are added while holding other inputs constant, the additional output gained from each additional unit of the input will decrease. This diminishing marginal productivity leads to a decreasing MRS.

When isoquants (which represent different combinations of inputs that produce the same level of output) are bent toward the origin, it reflects the fact that as more of one input is used, the amount of the other input that needs to be substituted decreases. This bending signifies the diminishing MRS and captures the idea that a larger quantity of one input can be substituted for a smaller quantity of the other input to maintain the same level of output.

Overall, the law of diminishing marginal rate of substitution indicates that the rate at which one input can be substituted for another decreases as the quantity of one input increases, leading to isoquants being bent toward the origin.

To know more about marginal rate of substitution, click here, https://brainly.com/question/30763866

#SPJ11

A temperature reversal is a layer in the air where air temperature increments with level. The lower part of a cap has an inversion. The cap is a layer of relatively warm air above. In the winter, a long, clear night is ideal for temperature inversion.

It ensures that the heat that escapes is greater than the heat that enters. Nevertheless, air should not be mixed vertically at lower levels. The earth is cooler than the air above it in the early morning hours because the day's heat is reflected off during the night. Temperature inversion is typical over polar regions.

Learn more about temperature inversion, here:

https://brainly.com/question/31985108

#SPJ1

Answer: Diploid Cells (?)

Explanation:

A battery is a device that converts chemical energy into electrical energy through a process known as an electrochemical reaction.

When a battery is connected to a circuit, the electrochemical reaction causes a flow of electrons from the anode to the cathode, generating an electric current that can power a device.

The metal chosen for the anode must be capable of losing electrons easily, while the metal chosen for the cathode must be capable of accepting electrons. The choice of metals can also affect the voltage and capacity of the battery, as well as its overall efficiency.

In general, the metals used in a battery should have a large difference in their electronegativity values, which determines how easily an atom can attract electrons. Common metals used in batteries include zinc, lithium, nickel, and cadmium.

Find out more on batteries at https://brainly.com/question/16553902

#SPJ1

Answer:

The density of aluminum is 2.7 g/cm³. Thus given sample is aluminum.

Explanation:

Given data:

Mass of sample = 54 g

Volume of sample = 20 cm³

Density of sample = ?

Is the sample is aluminum = ?

Solution:

We will calculate the density from given mass and volume.

d = m/v

d = density

m = mass

v = volume

d = 54 g/ 20cm³

d =  2.7 g/cm³

From literature it is known that the density of aluminum is 2.7 g/cm³. Thus given sample is aluminum.

When a drop of red food coloring is added to a glass of water, the red-colored molecules will diffuse uniformly throughout the water due to Brownian motion.

Diffusion is the movement of molecules or ions from a region of higher concentration to a region of lower concentration. It is driven by a concentration gradient, which is the difference in concentration between two regions.

Diffusion is a random process, meaning that the molecules move in a disordered manner due to Brownian motion.

Brownian motion is the motion of particles in a fluid, such as water, due to collisions with other particles. The random motion of the particles causes them to diffuse throughout the fluid.

Therefore, the red-colored molecules will diffuse uniformly throughout the water due to Brownian motion.

To learn more about brownian motion :

https://brainly.com/question/2604539

#SPJ11

Answer:

It takes 62863 dimes to equal the height of the Statue of Liberty.

Explanation:

If the Statue of Liberty is 305 ft tall and a coin is 1.35mm thick, how many coins will it take to equal the height of the statue?

Convert 305 ft to mm:

1 ft = 30.48 cm

305 ft = 9296.4 cm

92 964 mm

Now, if a dime is 1.35 mm thick, how many dimes will it take to get to 92 964 mm?

1 dime = 1.35mm

X dimes = 92964 mm

X coins = 92964 / 1.35

X = 62863 dimes

Answer:

The Earth rotates on its axis at a constant tilt.

Earths rotation on its axis at a constant tilt provides seasonal changes in the different part of the country. This resulted to the distribution of the heat of the sun from northern hemisphere and to southern hemisphere. Making areas with hot temperature may experience rainy season in a year. This will help production of crops or food supply and water supply available for living organism.

If the Earth's rotation is not tilted, then both the northern hemisphere and southern hemisphere will be covered with thick ice sheet. The equatorial region or near the equatorial region will experience tremendous warm temperature. Making our life on Earth not ideal for living.

Magnetic Field

Earth is protected by the magnetic from the dangerous radiation coming from the heat of the sun.

Water and oxygen

These two elements are essential for living organism in order to survive. The existence of waters proves that Earth temperature is conducive for living.

Answer:

false, Rutherford's experiment proved the nucleus being positive and dense.

Answer:

Yes Because the calculated volume is more accurate because you are able to measure the smaller dimensions.

~Apex lab

Answer:

8.24 mL

Explanation:

Density can be defined as mass per unit volume, according to the relationship shown in the attached image. Moles (a unit of measurement for small entities) can also be related to mass. Let's look at two formulas which would be useful for answering this question.

\(\boxed{\text{Density}=\frac{\text{Mass}}{\text{Volume}} }\)

\(\boxed{\text{Mole}\times\text{Mr}=\text{Mass (in grams)}}\) , where Mr stands for relative molecular mass

From the periodic table the Mr of nickel is 58.7.

Multiply the number of moles by the Mr:

Mass of Ni

= 1.25(58.7)

= 73.375 g

Calculate the volume of Ni:

Volume

= mass ÷density

= 73.375 ÷8.90

= 8.24 ml (3 s.f.)

To learn more about density, check out: https://brainly.com/question/15278418

The number of protons in an atom always determines its identity.

Each atom has a unique number of protons in its nucleus, which is also known as the atomic number. This number is what distinguishes one element from another.

For example, all carbon atoms have six protons, while all oxygen atoms have eight protons. The number of protons also determines the arrangement of electrons around the nucleus, which plays a role in chemical reactions.

While the number of neutrons and electrons can vary within an element, the number of protons remains constant and determines the identity of the atom.

This is why the periodic table is arranged by atomic number, as it groups together elements with the same number of protons and therefore similar chemical properties. Overall, the number of protons in an atom is the key characteristic that determines its identity.

Learn more about periodic table here.

https://brainly.com/questions/28747247

#SPJ11

To calculate the molar mass of the unknown protein, we can use the formula for osmotic pressure:

π = (n/V)RT

where:

π is the osmotic pressure,

n is the number of moles of solute,

V is the volume of the solution in liters,

R is the ideal gas constant (0.0821 L·atm/(mol·K)), and

T is the temperature in Kelvin.

First, let's convert the given values to the appropriate units:

Mass of protein = 28.85 mg = 0.02885 g

Volume of solution = 29.0 mL = 0.0290 L

Osmotic pressure = 3.28 torr

Now, we rearrange the osmotic pressure formula to solve for n:

n = (πV) / (RT)

Substituting the values:

n = (3.28 torr * 0.0290 L) / (0.0821 L·atm/(mol·K) * 289 K)

n ≈ 0.0386 mol

Next, we can calculate the molar mass (M) of the protein using the formula:

M = mass / moles

M = 0.02885 g / 0.0386 mol

M ≈ 0.746 g/mol

Therefore, the molar mass of the unknown protein is approximately 0.746 g/mol.

Learn more about  osmotic pressure here:

https://brainly.com/question/29823250

#SPJ11

Oxidation half equation; 2Fe^2+ ----> 2Fe^3+ + 6e

Reduction half equation; 3Cu^2+  + 6e ---->3Cu

An oxidation-reduction (redox) reaction is a type of chemical reaction that involves the transfer of electrons between two species. Oxidation refers to the loss of electrons by a substance, while reduction refers to the gain of electrons by a substance.

Redox reactions are important in many chemical and biological processes, such as cellular respiration, photosynthesis, corrosion, and combustion. They can also be used in industrial processes, such as electroplating, battery operation, and chemical synthesis.

Learn more about oxidation:https://brainly.com/question/9496279

#SPJ1

Answer:

671080887.616

Explanation:

The pH of a 0.014 M Ca(OH)2 solution is 12.45.

The pH of a solution is a measure of its acidity or alkalinity. It is determined by the concentration of hydrogen ions (H+) present in the solution. In the case of basic solutions, like Ca(OH)₂, the concentration of hydroxide ions (OH⁻) is important.

Calcium hydroxide, Ca(OH)₂, is a strong base that dissociates completely in water, releasing two hydroxide ions for every molecule of Ca(OH)₂. Therefore, the concentration of OH⁻ ions in a 0.014 M Ca(OH)₂ solution would be twice the concentration of the calcium hydroxide.

To find the pH of the solution, we can use the fact that pOH + pH = 14 for any aqueous solution. Since we have the concentration of OH⁻ ions, we can calculate the pOH and then subtract it from 14 to obtain the pH.

First, let's calculate the pOH. The concentration of OH⁻ ions in a 0.014 M Ca(OH)₂ solution is 2 times the concentration of Ca(OH)₂, which is 2 * 0.014 M = 0.028 M. Using the equation pOH = -log[OH⁻], we can find the pOH:

pOH = -log(0.028) ≈ 1.55

Now, we can find the pH by subtracting the pOH from 14:

pH = 14 - 1.55 ≈ 12.45

Therefore, the pH of the 0.014 M Ca(OH)₂ solution is approximately 12.45.

Learn more about  pH

https://brainly.com/question/2288405

#SPJ11

Answer:

H2SO4 + Cu(OH)2​ ---> CuSO4+ 2H2O

Absolutely, scientists can create plant food that is remarkably close to a leaf or plant using all the chemicals available to us today.

A scientist is someone who methodically acquires data and uses it to form hypotheses, test those assumptions, and further knowledge and understanding. Despite the fact that the name "scientist" predates Aristotle by more than two millennia, he is frequently referred to as the first scientist. He invented the methods of reasoning, observation, inquiry, and demonstration in Greece in the fourth century BC.

Because they provide specialized explanations for how the world functions, scientists play a crucial role in society. Science is a powerful tool for survival, despite the fact that it doesn't always provide us with joy, and humans have spent considerable time starting to figure out how to do both.

To know more about Scientists visit:

https://brainly.com/question/17450573

#SPJ4

Separation techniques include handpicking, threshing, winnowing, and sieving, Evaporation, Distillation.

Sedimentation or Filtration, Filtering Funnel.

Key ideas and a summary Using techniques like evaporation, distillation, filtration, and chromatography, which employ variations in the components of a mixture's physical qualities to separate them, mixtures can be physically separated.

To know more about Seperatation of mixture please click here ; https://brainly.com/question/11859222

#SPJ13

Answer:

the metal is gold I'd say

The mass of one metal atom is \(1.770\times 10^{-22}\)grams.

The metal atom is palladium.

Explanation:

Given:

A face-centered unit cell.

The density of the unit cell is \(12020 kg/m^3\).

The edge length of the unit cell 389.08 pm

To find:

The mass of one atom of the metal

Solution:

The density of the unit cell = d = \(12020 kg/m^3\)

The edge length of the unit cell = a = 389.08 pm

\(1 pm = 10^{-12} m\\a=389.08 pm=389.08\times 10^{-12} m=3.8908\times 10^{-10}m\)

Total number of atoms in F.C.C unit cell = z = 4

The atomic mass of the metal atom = M

The density of the unit cell is given by:

\(d=\frac{z\times M}{N_A\times a^3}\\12020 kg/m^3=\frac{4\times M}{6.022\times 10^{23}mol^{-1}\times (3.8908\times 10^{-10}m)^3}\\M=0.106586 kg/mol\\1 kg=1000 g\\M=0.106586 kg/mol=0.106586 \times 1000 g/mol\\M=106.586 g/mol\)

The mass of one mole of metal atom = 106.586 g

The mass of 1 atom of metal :

\(=\frac{106.586 g}{6.022\times 10^{23}}\\=1.770\times 10^{-22} g\)

The mass of one metal atom is \(1.770\times 10^{-22}\) grams.

The atomic mass of the metal atom is 106.586 g/mol which is close to the atomic mass of the palladium. Hence, the metal atom is palladium.

Learn more about the density of unit cell here:

brainly.com/question/7210717?referrer=searchResults

brainly.com/question/1594030?referrer=searchResults