Answer:
see the explanation
Explanation:
1. IV
2. VI
3. II
4. IV
5. II
6. VI
7. IV
8. III
9. II
10. I
11. I
12. V
13. VII
14. III
15. I
16. III
17. V
18. IV
19. V
20. III
21. IV
22. III
23. IV
24. VII
25. II
26. II
27. III
what is the result of applying too much sample to the tlc plate? select one: the sample leeches out into the elution solvent reduced separation between the spots some of the sample moves down instead of up the spot does not leave the origin the sample moves past the solvent front
Applying too much sample to the TLC (thin layer chromatography) plate results in reduced separation between the spots.
When performing thin layer chromatography it is necessary to not apply too much of the sample onto the plate. Once the elution solvent starts climbing up the plate, all the components of the sample will be separated along the plate according to the intensity of their interactions with the plate and the solvent (quantified as the Rf value - retention factor).
In a sample that is too concentrated or too much of it has been applied, the separation will be negatively affected because the huge spots originating from the sample components will overlap, making Rf determination difficult, if not impossible.
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Use the concepts of energy and stability as they relate to
orbital filling to write the electron configuration for iron. (Look at image)
The orbital diagram shows us the number of electrons that can be found in the atom.
How do you fill up an orbital?We know that the orbital is a region in pace where there is a high probability of finding the electron. We also know that the filling of the electrons into the respective orbitals where they fall in can be done by the use of the Aufbau principle.
According to the Aufbau principle, it is clear that in the filling of the electrons into the orbitals, the orbitals that are lesser in energy are first filled. The orbitals that are lesser in energy are always found quite close to the nucleus.
This implies that the relative energies of the orbitals would tend to increase as we move away from the nucleus. In other words, the nucleus is the part of the atom that would be at the lowest energy. The orbital diagram of iron by the use of the Aufbau principle have been shown in the image attached to this answer.
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1. Using PbS + 3PbO -> 3Pb + SO2a. How many moles of Pb will form from 17 moles of PbO (excess PbS)?b. How many moles of PbO are needed to make 27.4 moles of SO2 (excess PbS)c. Give 17.6 moles of PbS and 36 moles of PbO, which is the limiting reactant (show mathematical proof). It’s
Answer:
a. 25.5 moles of Pb will be formed.
b. 54.8 moles of PbO are needed.
c. PbS is the limiting reactant.
Explanation:
1st) It is necessary to write the balanced chemical reaction:
[tex]PbS+2PbO\rightarrow3Pb+SO_2[/tex]From the balanced chemical reaction we know that 1 mole of PbS reacts with 2 moles of PbO to produce three moles of Pb and 1 mole of SO2.
2nd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of Pb that will be produced from 17 moles of PbO and excess of PbS:
[tex]\begin{gathered} 2molesPbO-3molesPb \\ 17molesPbO-x=\frac{17molesPbO*3molesPb}{2molesPbO} \\ x=25.5molesPb \end{gathered}[/tex]So, 25.5 moles of Pb will be formed.
3rd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of PbO that are needed to make 27.4 moles of SO2 in excess of PbS:
[tex]\begin{gathered} 1molSO_2-2molPbO \\ 27.4molSO_2-x=\frac{27.4molSO_2*2molPbO}{1molSO_2} \\ x=54.8molPbO \end{gathered}[/tex]So, 54.8 moles of PbO are needed.
4th) Using the stoichiometry of the reaction we can calculate the limiting reactant:
- Calculation from 17.6 moles of PbS:
[tex]\begin{gathered} 1molPbS-2molPbO \\ 17.6molPbS-x=\frac{17.6molPbS*2molPbO}{1molPbS} \\ x=35.2molPbO \end{gathered}[/tex]From the stoichiometry of the reaction 1 mol of PbS reacts with 2 moles of PbO, so the 17.6 moles of PbS will need 35.2 moles of PbO to react properly, but we have 36g of PbO, so PbO will be the excess reactant and PbS the limiting reactant.
- Calculation from 36 moles of PbO:
We can do this calculation to confirm the previous one:
[tex]\begin{gathered} 2molPbO-1molPbS \\ 36molPbO-x=\frac{36molPbO*1molPbS}{2molPbO} \\ x=18molPbS \end{gathered}[/tex]In this case, we can see that 36 moles of PbO will need 18 moles of PbS to react properly, but we only have 17.6 moles of PbS. Here we confirm that PbS is the limiting reactant.
When a mycelium infiltrates an unexploited source of dead organic matter, what are most likely to appear within the food source soon thereafter?.
When a mycelium infiltrates an unexploited source of dead organic matter, Fungal digestive enzymes are most likely to appear within the food source soon thereafter.
A network of hyphae with fungal filaments is called mycelium. Although they can thrive in various habitats, such as rotting tree trunks, mycelia frequently grow underground. Mycelium can be produced by a single spore. Many fungi, including mushrooms, grow their fruiting bodies from mycelium. Mycelia are crucial to the health of the soil. They decompose organic matter, returning essential elements to the ecosystem as a result.
Fungal enzymes are active in an acidic environment that mimics the physiology of the human stomach. In vitro, fungi enzymes enhance the digestion of dietary fat, protein, and carbohydrates. The research of digestive deterioration with aging has been established using an adapted in vitro technique.
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A 3.00 L sample of paint that has a density of 4.65 g/mL is found to contain 33.1 g lead (II) nitride. Determine (A) how many grams of lead ion are in the paint sample? (B) How many ions of lead are in the paint? (C) what is mass percentage of lead in the paint/ What is the ppm?
1) Grams of lead.
Convert grams of lead (II) nitride to moles of lead (II) nitride
[tex]molofPb_3N_2=33.1gPb_3N_2\cdot\frac{1molPb_3N_2}{649.61gPb_3N_2}=0.0509lofPb_3N_2[/tex]Convert moles of lead (II) nitride into moles of Pb
[tex]\text{molesofPb}=0.0509molPb_3N_2\cdot\frac{3\text{molPb}}{1molPb_3N_2}=0.1527\text{molPb}[/tex]Convert moles of Pb into grams of Pb
[tex]\text{gofPb}=0.1527\text{molPb}\cdot\frac{207.2\text{ g Pb}}{1\text{molPb}}=31.64\text{ g Pb}[/tex]There is 31.64 g of ions of lead in the sample of paint.
aldol condensation is an easy way of making: group of answer choices carbon-carbon bond carbon-oxygen bond carbon-nitrogen bond carbon-hydrogen bond all of these bond types
Aldol condensation is an easy way of making carbon-carbon bond.
In the field of chemistry, we can describe aldol condensation as a type of bond that occurs due to electrophilic substitution at the alpha carbons of the enol.
Aldol condensation is known to be the easiest way for one carbon to form bonds with another carbon.
Such an aldol reaction that takes place between carbonyl compunds instead of aldehydes or enols is referred to as crossed aldol condensation.
Aldol reactions are known to be an important part of synthesizing organic compounds as carbon-carbon bonds are formed due to it.
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aqueous ammonia is commercially available at a concentration of 16.0 m. how much of the concentrated solution would you use to prepare 500.0 ml of a 1.90 m solution?
Volume of 16.0 m aqueous ammonia solution required to prepare 500.0 ml of a 1.90 m solution is 50ml
What is molarity?Molarity is used to describe the concentration of a solution. Molarity, also called molarity, is the number of moles of solute (dissolved substance) per liter of solution. The unit of molarity is moles per cubic decimeter, written as mol dm⁻³ or simply M. A cubic decimeter is the same as a liter. In many old textbooks you can find concentrations in moles/liter written as mol l⁻¹
Original concentration x initial volume = final concentration x final volume.
We will use the equation (M₁)(V₁) = (M₂)(V₂)
Given,
M₁ = 16.0 m
M₂ = 1.90 m
V₂ = 500.0 ml or 0.5L
So, 16 × V₁ = 1.90 × 0.5
16 V₁ = 0.9 m
V₁ = [tex]\frac{0.9}{16}[/tex]
V₁ = 0.05L or 50ml
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a 100 ml solution contains 0.100 m formic acid (pka 3.75) and 0.100 m sodium formate. if 1.00 ml of 0.050 m hcl were added, what would be the ph of the solution?
Answer:
ngl ts ngl ts ts ngl...imma keep it a buck.96 ion got the answers kanye do.
Explanation:
what is acetaldehyde? group of answer choices a substance in liver that helps detoxify alcohol an enzyme used in alcohol metabolism a ketone body the final product of alcohol metabolism. a toxic compound created in alcohol metabolism
Acetaldehyde is a toxic compound created in alcohol metabolism.
what is alcohol metabolism?
Alcohol dehydrogenase, an enzyme found in the liver cells, is responsible for the majority of alcohol metabolism (ADH).
Alcohol metabolism is governed by a number of processes.
The two enzymes involved in the most common of these methods are alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ADH) (ALDH). These enzymes assist in breaking down the alcohol molecule so that the body can eliminate it. ADH first breaks down alcohol into acetaldehyde, an extremely dangerous molecule and known carcinogen. In a following phase, acetaldehyde is further transformed to acetate, a less active byproduct, for rapid removal. Acetate can then be easily converted into carbon dioxide and water.
The researchers reported that heavy drinking leads to elevated acetaldehyde levels, which leads to inhibited ALDH enzymes, and in turn causes these adverse effects. The alcohol does not properly metabolize.
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What is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (Formula:)
Answer: so the answer will be 25 J
Explanation: The mass is 0.5 kg and the velocity is 10 meters per second. So: KE = (1/2)(0.5)(10)^2. Thus the kinetic energy of the ball is 25 J
Does the outer core have convection currents?
Answer:
yes there R, The Earth’s outer core is in a state of turbulent convection
Explanation:
have good day
Answer:
Technically? Yes. Because the Earth's outer core is in a state of turbulent convection as the result of radioactive heating and chemical differentiation. This sets up a process that is a bit like a naturally occurring electrical generator, where the convective kinetic energy is converted to electrical and magnetic energy.
Explanation:
Brainlest, Please!
Which principle did you apply in Step 4 of the
investigation?
Answer:
Find root causes.
Explanation:
i hope the answer be right
how do atoms form a new substance? responses by sharing electrons with each other by sharing electrons with each other by losing electrons by losing electrons by gaining electrons from each other by gaining electrons from each other by losing neutrons to each other
By exchanging electrons with one another, atoms create new materials. When two atoms share at least one pair of electrons, this is known as a covalent link. Ionic bonds form when positive are attracted to one another and share an electron as a consequence.
What does joining atoms to create new compounds and sharing electrons have in common?When two atoms share , they establish a connection. Because the two positively charged atomic nuclei and shared, negatively charged electrons in a covalent bond are attracted to one another by electrostatic forces, the bond is stable.
One or more pairs of electrons from each atom are shared by the other atoms to form a covalent link. The two atomic nuclei are pulling these electrons in opposite directions. When the gap between two atoms' electronegativities is too narrow for an electron transfer to take place and form ions, a covalent bond is created.
Reactants interact with one another in a chemical reaction, breaking the bonds that hold their atoms together.
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Answer:
Here's your answer on the Image!
Explanation:
I took the K-12 Quiz
To find the order of a reaction with respect to one reactant, you will monitor the __________ as the _________of ________ is changed.
To find the order of a reaction with respect to one reactant, you will monitor the Percentage as the reactant of product is changed.
To determine the reaction order from experimental data, either the differential rate law or the integrated rate law can be used. In the rate law, the exponents are frequently positive integers: 1 and 2 or even 0. As a result, the reactions in each reactant are of zeroth, first, or second order. Changes in the concentration of the reactants or products can be used to calculate the rate. changes in reactant or product mass or volume If the reaction is the result of multiple reaction steps with different orders, the order of the reaction can be changed by adjusting the reagent concentration. Because the order is often ruled by the slowest reaction, you can manipulate the relative reaction speed by varying the concentrations.
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Answer:
Explanation:
You will watch the Percentage when the reactant of the product is changed in order to determine the sequence of a reaction with respect to one reactant.
Either the differential rate law or the integrated rate law can be used to infer the reaction order from experimental data.
The exponents of the rate law are frequently positive numbers, such as 1 and 2 or even 0.
Because of this, each reactant undergoes reactions of the zeroth, first, or second order.
The rate can be calculated using changes in the concentration of the reactants or products.
A change in the reactant, product, or reactant's volume by changing the reagent concentration, the reaction order can be modified if it involves several steps that have been performed in a different sequence.
You can also control the relative reaction speed by changing the concentrations because the order is frequently determined by the slowest reaction.
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A solution of potassium hydroxide (KOH) is added to a solution of hydrochloric acid. How many moles of potassium hydroxide would react with 1 mole of hydrochloric acid? (Hint: It may help to write out a balanced symbol equation for the reaction.)
Taking into account the reaction stoichiometry, 1 mole of potassium hydroxide would react with 1 mole of hydrochloric acid
Reaction stoichiometryIn first place, the balanced reaction is:
KOH + HCl → KCl + H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KOH: 1 moleHCl: 1 moleKCl: 1 moleH₂O: 1 moleAmount of moles of KOHYou can see that the stoichiometric mole ratio of KOH to that of HCl is 1:1. This means that 1 mole of KOH will require 1 mole of HCl.
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There are 120.0 mL of O2 at 700. 0 mmHg and 15⁰ C. What is the number of grams present?
Answer:
0.1498 g of O2.
Explanation:
The Behavior of Gases => Ideal Gas Law.
The ideal gas law is a single equation that relates the pressure, volume, temperature, and the number of moles of an ideal gas, which is:
[tex]PV=nRT,[/tex]where P is pressure in atm, V is the volume in liters, n is the number of moles, R is the ideal gas constant (0.082 L*atm/mol*K), and T is the temperature in the Kelvin scale.
So we have to convert pressure from 700.0 mmHg to atm, volume from 120.0 mL to L, and 15 °C to K.
Let's convert pressure taking into account that 1 atm equals 760 mmHg, like this:
[tex]700.0\text{ mmHg}\cdot\frac{1\text{ atm}}{760\text{ mmHg}}=0.9211\text{ atm.}[/tex]Remember that 1 L equals 1000 mL, so 120.0 mL would be equal:
[tex]120.0\text{ mL}\cdot\frac{1\text{ L}}{1000\text{ mL}}=0.1200\text{ L.}[/tex]And the conversion from °C to K is just sum °C with 273, so 15 °C in K is:
[tex]K=\degree C+273=15\degree C+273=288\text{ K.}[/tex]Finally, we can use the ideal gas formula, solving for 'n' (number of moles) and replacing the data that we have, as follows:
[tex]\begin{gathered} n=\frac{PV}{RT}, \\ \\ n=\frac{0.9211\text{ atm}\cdot0.1200\text{ L}}{0.082\frac{L\cdot atm}{mol\cdot K}\cdot288\text{ K}}, \\ \\ n=4.680\cdot10^{-3}\text{ moles.} \end{gathered}[/tex]Now, the final step is to convert 4.680 x 10⁻³ moles of O2 to grams using the molar mass of O2 that can be calculated using the periodic table, which is 32 g/mol. The conversion will look like this:
[tex]4.68\cdot10^{-3\text{ }}moles\text{ O}_2\cdot\frac{32\text{ g O}_2}{1\text{ mol O}_2}=0.1498\text{ g O}_2.[/tex]The answer would be that there are 0.1498 g of O2.
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of.
Answer:
12.
Explanation:
Beryllium is in Group 2 (Column 2) with the atomic number 4.
The atomic number to the next element in the group would be right below it, Magnesium (Mg). Magnesium has an atomic number 12.
The atomic number is the small number on the top left corner of the square of the element.
When a mycelium infiltrates an unexploited source of dead organic matter, what are most likely to appear within the food source soon thereafter?.
Fungal digestive enzymes are most likely to appear within the food source soon thereafter. Mycelium has a porous structure made up of tubular filaments known as hypha.
Every single mycelium fiber is made up of an array of slender cells that are separated by cross walls, known as septum, and are all enclosed within the same cell wall. Tiny holes in the septum allow nutrients, water, and other small molecules, as well as mycelium fiber, to move quickly from cell to cell. Mycorrhizae are symbiotic relationships that fungi and plants form. Fungi colonize the root system of a host plant, increasing water and nutrient absorption, while the plant provides carbohydrates formed by photosynthesis to the fungus.
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Answer:
Explanation:
Fungal haustoria are most likely to appear in the food source shortly after a mycelium invades an untapped source of dead organic matter.
What do fungal haustoria do?
A specialized fungal hypha that breaks through the wall of a plant cell and expands inside of it creates a haustorium.
The haustorium is encircled by an extrahaustorial membrane, a thickened version of the plant cell plasma membrane, rather than being situated inside the cytoplasm of the plant cell.
Are haustoria produced by fungi?
All significant divisions of fungi create haustoria.
There are various types of haustoria.
Generally, the fungus increases the surface area in contact with the host plasma membrane upon penetration and releases enzymes that disintegrate the cell walls, allowing for a greater potential transfer of organic carbon from the host to the fungus.
What kind of structure is a haustoria?
Haustoria are incredibly diverse plant parasite structures.
Haustoria are visible on exposed roots in root parasites.
At the location of contact between the parasite and the host, they manifest as swollen tissue.
In dodders, haustoria are structures that connect the host and parasite and have the appearance of pegs or suction cups.
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The _______ the number of theoretical plates, the _______ the separation of a mixture of two liquids.
The effectiveness of columns is the number of theoretical plates, the the Fractional distillation is separation of a mixture of two liquids.
Fractional distillation divides a mixture into a number of distinct parts known as fractions.
What is fraction distillation process?Fractional distillation divides a mixture into a number of distinct parts known as fractions. A tall fractionating column is installed above the mixture, with several condensers exiting at various heights. The bottom of the column is hot, while the top is cool.In oil refineries, fractional distillation is used to separate the complex mixture into fractions with similar boiling points and thus similar molecular weights and properties. An oil refinery produces various fractions such as gasoline, diesel fuel, kerosene, and jet fuel.fractional distillation : A process that involves heating, vaporization, condensing, and cooling. A lower boiling point liquid will vaporize before a higher boiling point liquid.To learn more about : fractional distillation
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The following diagram of a pendulum shows the path it takes as it swings back and forth.
As the pendulum moves from point 2 to point 3, what happens to its mechanical energy?
Pendulum shows the path it takes as it swings back and forth and it is because of kinetic energy is converted into potential energy only once
Pendulum is the point mass suspended by the weightless and inextensible string fixed rigidly to support pendulum is also used in scientific instrument and it form because of gravity and in that pendulum potential energy is transformed to the kinetic energy and come back again and weight of pendulum is released and then it get active and gravity pull it back and that's why kinetic energy is converted into potential energy only once
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a compound differs from a mixture in that a compound: a. contains only one element b. varies in chemical composition depending on the size of the sample c. has a definite composition d. can be classified as either heterogeneous or homogeneous
A compound differs from a mix in that a compound has a definite composition by the mass of the elements it contains. Option C.
A compound may be a substance formed by the chemical combination of two or more elements. a mix is a substance formed by physically mixing two or more substances. a mix is two or more substances that are not chemically combined, and a compound is 2 or more elements that are chemically combined.
This differs from compounds, which are composed of drugs in fixed proportions. Substances during a mixture do not chemically combine to form new substances as compounds do. A compound may be a substance formed by the combination of two other chemical elements. a mix is a substance formed from two or more substances that can be separated using physical methods.
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when making soap, if 890 g of a specific fat react completely with 120 g of sodium hydroxide, the product formed are soap and 92 g of glycerin. calculate the mass of soap formed to satisfy the law of conservation of mass.
The mass of soap formed to satisfy the law of conservation of mass is 918g.
What is law of conservation of mass?According to the rule of conservation of mass, in a chemical process, mass neither creates nor destroys itself. When coal is burned, for instance, the carbon atom in it transforms into carbon dioxide. Although the carbon atom's shape changes from solid to gas, its mass remains constant.
The mass of the reactants and products in a chemical reaction must equal each other according to the law of conservation of mass.
Fat + sodium hydroxide = soap + glycerin
890+ 120 = soap + 92
1010 = soap + 92
soap = 1010 - 92
soap = 918g.
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how many moles are in a 60gram sample of NaCI
Answer:
[tex]1.03\text{ moles}[/tex]Explantion
Here, we want to get the number of moles in 60 g sample of NaCl
Mathematically, to get this, we have to divide the mass given by the molar mass of NaCl
Thenmolar mass of NaCl is 58.44 g/mol
Thus, we have the number of moles as:
[tex]\frac{60}{58.44}\text{ = 1.03 mole}[/tex]9. which flask contains the sample with the greatest density? a flask a b flask b c flask c d flask d e flask e 10. which flask contains the smallest number of moles of gas?
9 = T = 40 degrees Celsius, P = 2 atm is the greatest density
10 = T = 50 degrees Celsius, P = 0.5 atm is the smallest number of moles of gas .
Exactly which flask has the highest density?The gas with the highest atomic mass will be contained in the flask with the highest density.
Which flask would hold the most moles of gas at any given time?At constant volume and pressure, the ratio of the gas's moles to the temperature is inverse. Since the temperature was dropped, the flask containing helium will thus contain the most moles of gas.
Which flask is under the greatest pressure?Pressure and temperature have a straight relationship, PV = nRT, according to the ideal gas law. The pressure will be maximum in the heated helium flask because of this. d.
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which of the following pairs of aqueous solutions will form a precipitate when mixed? a) nh4no3 k2co3 b) hg2(no3)2 nabr c) kcl li3po4 d) agc2h3o2 cu(no3)2 e) none of the above solution pairs will produce a precipitate.
Hg2(NO3)2 NaBr will precipitate when combined in an aqueous solution without a catalyst at room temperature.
What is an aqueous solution?A solution that uses water as the solvent is said to be aqueous. It is frequently represented in chemical equations by adding to the relevant chemical formula.
To represent a solution of table salt, or sodium chloride, in water, the symbol Na+ + Cl can be used.
In an aqueous solution, liquid water acts as the solvent.
In other words, the ions and molecules that make up the solute (dissolved) are surrounded by the water molecules and incorporated into their web of connections.
The dissolved organisms then spread out across the water.
An aqueous solution is, to put it simply, anything that has dissolved in water.
The water sign represents (aq).
A substance that has been dissolved in water is called an aqueous solution.
Therefore, Hg2(NO3)2 NaBr will precipitate when combined in an aqueous solution without a catalyst at room temperature.
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order the steps to show how energy is trranformed in plant cells
Solar energy is converted into chemical energy i.e. glucose with the help of photosynthesis.
What is photosynthesis?Photosynthesis is the process in which light energy is converted to chemical energy in plant cells. In cellular respiration, plants use the chemical energy that is stored during the process of photosynthesis. Photosynthesis is a process in which plants convert energy from the sun into usable energy that is used by the cells in different activities. Plants use the light energy of the sun, carbon dioxide, and water to make glucose and oxygen. The glucose is stored in different parts of the plant while on the other hand, the oxygen is released in the atmosphere.
So we can conclude that with the help of the photosynthesis process, Solar energy is converted into chemical energy.
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a lab assistant has asked to dissolved 18.4 g of hcl is added in 662 ml of water. what is the ph of resulting solution. (assume that the volume remains constant.)
The pH value of the resulting solution is 11.9.
To calculate the pH value of the solution we need to calculate the molarity (c) of the solution, using the number of moles of HCl (n) and the volume of the solution (V = 662 mL = 0.662 L).
c = n/V
To obtain the number of moles of HCl, we are going to use the mass of HCl (m = 18.4 g) and its molar mass (M = 36.5 g/mol):
n = m/M
n = 18.4 g / 36.5 g/mol
n = 0.504 mol
Now we can calculate the molarity:
c = 0.504 mol / 0.662 L
c = 0.761 M
Because HCl is a monoprotic acid, the molarity of the solution is equal to the concentration of H⁺ ions ([H⁺] = 0.761 M), which is important for calculating pH:
pH = -log[H⁺]
pH = -log(0.761)
pH = 11.9
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a 0.450 m solution of kcl needs to be prepared through dilution. a 2.00 m stock solution will be added to a 0.250 l volumetric flask and then water will be added to the 0.250 l mark. determine the volume (in ml) of the 2.00 m stock solution of kcl needed to produce this solution.
Taking into account the definition of dilution, the volume of the 2.00 M stock solution of KCl needed to produce the solution is 56.25 mL.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. It is accomplished by simply adding more solvent to the solution at the same amount of solute.
The amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeVolume of the stock solutionIn this case, you know:
Ci= 2 MVi= ?Cf= 0.450 MVf= 0.250 LReplacing in the definition of dilution:
2 M× Vi= 0.450 M× 0.250 L
Solving:
Vi= (0.450 M× 0.250 L)÷ 2 M
Vi= 0.05625 L= 56.25 mL (being 1 L= 1000 mL)
In summary, 56.25 mL of stock solution are needed.
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which statement correctly compares the weight and the mass of an object?
The statement that correctly compares the weight and the mass of an object is as follows: its weight changes based on location but the mass stays the same (option C).
What is weight and mass?Weight is the force on an object due to the gravitational attraction between it and the Earth. Weight is a function of an object's mass and it's gravitational force.
Mass, on the other hand, is the quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter and is measured in kilograms in the SI system of measurement.
An object's mass does not change, however, its weight is subjective to changes in location. This means that a ball on Earth will weigh differently from a ball in mars.
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Why was temperature change for the water slight in your experiments while the temperature change for the metal was large?.
The difference in the temperature change can be explained by the difference in the specific heat capacity for water (4.186 J/g°C) and the specific heat capacity for the metal you used (metals have small values for specific heat capacities).
Specific heat capacity is a material characteristic that quantifies how much heat (in Joules) is needed to change the temperature of 1 g of the material by a single degree (°C or K). Water has a relatively high specific heat capacity (4.186 J/g°C), which means that you need to add 4.186 Joules of heat to increase the temperature of 1 g of water by 1 °C.
On the other hand, metals have small values for their specific heat capacities (0.900 J/g°C for aluminum, 0.386 J/g°C for copper, 0.420 J/g°C for steel), which means that their temperature will drastically change for the same amount of heat invested or taken away.
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