The cell potential for the standard galvanic cell shown above is +1.56 V. If AgNO3(aq)|Ag(s) is replaced with
1 M Pb(NO3)2(aq) solution and a Pb electrode, which of the following describes what happens to the operation
of the cell, and why?
(A)
Nothing changes because galvanic cells that have a Zn(s) electrode have a constant cell potential, E cell, of
+1.56 V.
(B)
The cell stops generating a voltage because the standard reduction potentials of Pb²+ and Zn²+
negative.
are both
(C)
The cell potential decreases because the reduction of Pb2+ is less thermodynamically favorable than the
reduction of Ag+.
(D)
The cell potential increases because twice as many electrons are transferred between Pb²+ and Zn than
between Ag and Zn.
Answers
The correct answer is (C) The cell potential decreases because the reduction of \(Pb_{2}^{+}\) is less thermodynamically favorable than the reduction of \(Ag^{+}\).
What is reduction?
Reduction is a chemical reaction in which an atom or molecule gains one or more electrons, resulting in a decrease in its oxidation state. It is the opposite of oxidation, which involves the loss of electrons.
In a reduction reaction, the species that gains electrons is said to be reduced, while the species that loses electrons is said to be oxidized. This is because the reduction of a species involves a decrease in the number of positively charged species, which corresponds to a decrease in its oxidation state.
The standard galvanic cell given in the question is:
Zn(s) | \(Zn_{2}^{+}\)(aq, 1 M) || \(Ag^{+}\)(aq, 1 M) | Ag(s)
The cell potential, as given in the question, is +1.56 V, which means that the reaction is thermodynamically favorable and the cell is generating a voltage.
Now, if we replace the \(AgNO_{3}\)(aq)|Ag(s) half-cell with a \(Pb(NO_{3})_{2}\)(aq)|Pb(s) half-cell, the new cell becomes:
Zn(s) | \(Zn_{2}^{+}\)(aq, 1 M) || \(Pb_{2}^{+}\)(aq, 1 M) | Pb(s)
The standard reduction potential of \(Pb_{2}^{+}\) is -0.13 V, which is less than that of \(Ag^{+}\) which is +0.80 V. This means that the reduction of \(Pb_{2}^{+}\) is less thermodynamically favorable than the reduction of \(Ag^{+}\). As a result, the cell potential will decrease when the \(AgNO_{3}\)(aq)|Ag(s) half-cell is replaced with a \(Pb(NO_{3})_{2}\)(aq)|Pb(s) half-cell.
Therefore, option (C) is the correct answer.
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Related Questions
Which sentence most accurately describes the daily growth rate of plants? (1 point)
Answers
Answer: D- average change in plant height, divided by, the number of days.
(i had to look up the test you were talking about to find what the answer choices were.)
Hope this helps!
True or False: In every gram of sucrose (table sugar) there is 0.513 g of oxygen
Answers
Answer:
True
Explanation:
Step 1: Find molecular formula of sucrose
C₁₂H₂₂O₁₁
Step 2: Convert moles of oxygen present to grams
1 mol O = 16 g O
11 mol O = 176 g O
Step 3: Find molar mass of sucrose
C - 12.01 g/mol
H - 1.01 g/mol
O - 16.00 g/mol
12.01(12) + 22(1.01) + 11(16.00) = 342.34 g/mol C₁₂H₂₂O₁₁
Step 4: Set up dimensional analysis
\(1 gC_{12}H_{22}O_{11}(\frac{176 gO}{342.34gC_{12}H_{22}O_{11}} )\)
Step 5: Multiply/Divide and cancel out units
Grams of C₁₂H₂₂O₁₁ and grams of C₁₂H₂₂O₁₁ cancel out.
We are left with grams Oxygen
176/342.34 = 0.514109 grams Oxygen
In mass-volume and volume-mass calculations all gases are considered to be at standard.
Answers
In mass-volume and volume-mass calculations all gases are considered to be at standard temperature.
what is standard temperature?
Standard sets of settings for experimental measurements are produced at standard temperatures and pressures (STP), allowing comparisons to be made between various sets of data. The most popular standards, though not universally acknowledged, are those of the National Institute of Standards and Technology (NIST) and the International Union of Pure and Applied Chemistry (IUPAC). For their common reference conditions, other organizations have developed a number of different alternative definitions.
In 1982, the IUPAC modified its definition of standard pressure and temperature for chemistry.
Before 1982, the standard temperature and pressure (STP) were 273.15 K (0 °C, 32 °F) and exactly 1 atm, respectively (101.325 kPa).
STP has been defined since 1982 as having a temperature of 273.15 K (0 °C,32F
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Need the remaining questions answered thank you
Answers
Explanation:
14) We need to find the # of moles of NaOH in 3.5 L solution. Note: 1 M = 1 mol/Ll
(3.00 mol NaOH/1 L)(3.5 L) = 10.5 mol NaOH
Next we need find the volume of 19.4M NaOH solution that contains 10.5 mol NaOH:
(10.5 mol NaOH)×(1 L NaOH/19.4 mol NaOH)
= 0.541 L NaOH
This means that 0.541 L (541 mL) of 19.4M NaOH solution must be diluted to 3.5 L in order to get 3.00M NaOH solution.
15) 425 mL (0.425 L) of 0.105M HCl solution contains
(0.105 mol HCl/1 L)×(0.425 L) = 0.0446 mol HCl
so when enough water is added to 1L, the molarity becomes
0.0446 mol HCl/1 L = 0.0446M HCl
16) CaBr2 ---> Ca^+2 + 2Br^-1
For every Ca^+2 ion in the solution, you have 2 Br^-1 ions
If the concentration of CaBr2 is 6 mol/L (or 6M),.then the concentration of Br^-1 irons is
[Br^-1] = 2×[Ca^+2] = 2×(6 mol/L) = 12 mol Br^-1/L
17) The reason you won't need 1.0 L of water is that part of the volume of the solution is taken up by the NaOH so you will always need slightly less than 1 L.
The color of light emitted during a flame test depends on
A) the location of electrons only
B) the size of the atom only
C) the size of the atom and the location of protons
D) the location of electrons and size of the atom
Answers
option of d is the write answer
Answer:
I would say A
hope this is right
5) Bob was walking home from school at a rate of 2 miles per hour at 3:30 and at 4:00, he
was walking 4 miles per hour. What was his rate of acceleration during that time? (Hint:
Him needs to be in hours, not minutes.)
Answers
Answer:
Explanation:
Applying,
naming compoundingLi2O • 9 H2O
Answers
Let's see that the first compound represents an oxide which is a combination resulting from the union of a metallic or nonmetallic element with oxygen. To name an oxide, you have to write "___ oxide", where the line is the name of the element. In this case, lithium is the element that is bonded with oxygen, so its name is lithium oxide.
The second compound that you can recognize as water, is an oxide too. So its name is also hydrogen oxide.
What is the chemical equation for the burning of propane if all the products and reactants are in the gas phase?
Answers
Answer:
C3H8(g) + 5O2(g) —> 3CO2(g) + 4H2O(g)
Explanation:
The burning of propane is simply called Combustion of propane.
When an organic compound under goes Combustion, carbon dioxide, CO2 and water, H2O are produced respectively.
Thus, the burning of propane will yield the following:
C3H8(g) + O2(g) —> CO2(g) + H2O(g)
Now, let us balance the equation. This is illustrated below:
C3H8(g) + O2(g) —> CO2(g) + H2O(g)
There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 3 in front of CO2 as shown below:
C3H8(g) + O2(g) —> 3CO2(g) + H2O(g)
There are 8 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of H2O as shown below:
C3H8(g) + O2(g) —> 3CO2(g) + 4H2O(g)
There are 2 atoms of O on the left side and a total of 10 atoms on the right side. It can be balance by putting 5 in front of O2 as shown below:
C3H8(g) + 5O2(g) —> 3CO2(g) + 4H2O(g)
Now, the equation is balanced.
find the ph and fraction of association of 0.026 m naocl
Answers
The pH and the fraction of the association of the 0.026 m NaOCl is the 10 ans 0.0035.
The chemical equation is :
NaOCl ---> Na⁺ + OCl⁻
0.026 0.026 0.026
OCl⁻ + H₂O ⇄ HOCl + OH⁻
0.026-x x x
The Kb is as :
Kb = 10⁻¹⁴ / 3 × 10⁻⁸
Kb = 3.3 x 10⁻⁷
x² / 0.026 - x = 3.3 x 10⁻⁷
x = 9.2 × 10⁻⁵
[OH⁻] = [HClO] = 9.2 × 10⁻⁵
[OCl⁻ ] = 0.026
pOH = -log [OH⁻]
pOH = - log (9.2 × 10⁻⁵)
pOH = 4.0
pH = 14 - 4
pH = 10
The fraction of the association is as :
α = [HOCl] / [OCl⁻ ]
α = 9.2 × 10⁻⁵ / 0.026
α = 0.0035
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Identify the species oxidized, the species reduced, the oxidizing agent and the reducing agent in the following electron transfer reaction.: Cl2_Clo -> 2Cl +Co^2+ As the reaction proceeds, electrons are transferred from _____ to _____.
Answers
Always moving from anode to cathode, electrons. This is the transition from an oxidation to a reduction half cell. Electrons will switch from Fe²⁺ towards Cl₂ in this reaction.
What is an electron, for instance?The smallest elemental component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. One electron but one proton are all that the hydrogen atom has. The uranium atom, on the other hand, has 92 protons, which translates to 92 electrons.
Briefing:Net reaction:
Cl₂ + 2Fe²⁺ → 2Cl⁻ + 2Fe³⁺
Oxidation state:
0 +2 -1 +3
Because Cl's oxidation state is shifting form 0 to -1. Cl₂ is thus transformed into Cl. Fe²⁺ is oxidising to Fe³⁺ as the oxidation number of Fe changes from +2 to +3.
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She sees that the cells are joined together, so she knows that they are from one organism. She also sees that all of them have cell walls.
what could Rosa could be looking at:
Answers
Answer:
animal tissue/ flesh
Explanation:
multi cell like us we have all that in our flesh so if we looked at it under the scope it would look that way
hope that helps and have a great day
if it helps think about giving a good rating and branniest answer
PLS I NEED HELP ITS IMPORTANT I AM GIVING 25 POINTS HELP PLEASE. I NEED IT FAST
Why is it important for cells to be able to turn genes on and off? Select ALL Correct reasons!
Question 2 options:
A. so the cell is not too chaotic
B. so the cell can respond to the environment
C. so the cells can grow uncontrollably
D.so the cell does not waste energy
Answers
Answer:
B
Explanation: Since you need this quick, its because it needs to respond to the environment. I dont remember the exact term
answer for the rate please help me with my chemistry homework thank you so much
Answers
Answer:
Rate cup 1: 36.00 tsp/h.
Rate cup 2: 59.50 tsp/h.
Rate cup 3: 70.13 tsp/h.
Explanation:
Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.
Let's calculate each case:
- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:
\(\frac{1\text{ tsp}}{100\text{ s}}\cdot\frac{3600\text{ s}}{1\text{ h}}=36.00\frac{tsp}{h}.\)The rate of cup 1 is 36.00 tsp/h.
- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:
\(\frac{2\text{ tsp}}{121\text{ s}}\cdot\frac{3600\text{ s}}{1\text{ h}}=59.50\frac{tsp}{h}.\)The rate of cup 2 is 59.50 tsp/h.
- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:
\(\frac{3\text{ tsp}}{154\text{ s}}\cdot\frac{3600\text{ s}}{1\text{ h}}=70.13\frac{tsp}{h}.\)The rate of cup 3 is 70.13 tsp/h.
Predict whether or not the substances in the table will sublime at STP. Base your predictions only on the type of force holding the solid together.
Answers
The states of matter of the materials;
1) Dispersion forces - Yes
2) Hydrogen bonding - No
3) Ionic - No
4) Dispersion forces - No
5) Dispersion forces - Yes
6) Ionic - No
7) Hydrogen bonding - No
What is the sublimation?
Sublimation is a physical process in which a substance transitions directly from its solid phase to its gaseous phase without passing through the intermediate liquid phase. In sublimation, the solid substance is heated, and the resulting gas molecules escape from the solid lattice structure without the need for melting.
One common example of sublimation is the process of dry ice. Dry ice is solid carbon dioxide (CO2) that sublimes at a temperature of -78.5 degrees Celsius (-109.3 degrees Fahrenheit). When dry ice is exposed to room temperature, it transitions directly from a solid to a gas, producing a fog-like effect.
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interview at least three farmers in your community. ask them how they prepare their field for planting vegetable crops.And the common tools, implements and equipment they used in preparing for planting
Answers
Answer:
I think they use water,shovel,and rake.
Explanation:I was in ag in 8th grade and first we used a rake and raked all the stuff up. Then we waterd the dirt. Then dug a hole and planted the plant and waterd it after.
I hoped this help have a nice day! Comment if you need more help.
Also please rate 5 and give thanks.
Consider the reaction H2 + I2 2HI for which K = 44.8 at a high temperature. If an equimolar mixture of reactants gives the concentration of the product to be 0.50 M at equilibrium, determine the equilibrium concentration of the hydrogen.
A) 1.1 * 10^–1 M
B) 7.5 * 10^–2 M
C) 3.7 *10^–2 M
D) 1.3 * 10^1 M
E) 5.6 * 10^–3 M
Answers
Equilibrium constant K= 44.8 for H₂ + I₂ → 2HI Equimolar reactants, HI = 0.50M, H₂ = 5.6×10⁻³ M. The correct option is e.
given equilibrium constant (K) and the equilibrium concentration of the product HI = 0.50M
balanced equation for the reaction
H₂ + I₂ → 2HI
K =\(\frac{HI^{2} }{[H_{2][I_{2}] } }\)
K=44.8 and [HI]=0.50M
[H₂] = \(\frac{[HI]^{2} }{K}\)
[H₂] =\(\frac{(0.50M)^{2} }{44.8}\)
[H₂] ≈0.0056M
equilibrium concentration of hydrogen is 0.0056M sa per the given reaction.
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The graph represents the change in that occurs when food is cooked over a charcoal grill. Which statement correctly explains the graph?A. The reactants are unlit charcoal that has already released its energy, and the products are charcoal that has already burned.B. The reactants are charcoal that has already burned and released its energy, and the products are unlit charcoal.C. The reactants are unlit charcoal, and the products are charcoal that has already burned and released its energy.D. The reactants are charcoal that has already burned, and the products are unlit charcoal that has already released its energy.
Answers
The answer is C.
The reactants are charcoal that is unlit + oxygen and the products are the burnt charcoal + energy.
\(C_xH_y+O_{2\text{ }}\rightarrow CO_2+H_2O\text{ + heat}\)So for every combustion reaction like this one, CxHy is the wood. So before you light the wood, it is actally a reactant together with oxygen, because without oxygen the wood will not burn. So under the influence of heat, wood produces substances like carbon dioxide and heat, the moment you see wood burning it it already producing products, CO2 and heat (which is the fire). This is a combustion reaction.
Combustion reaction is exothermic because it releases energy.
if a molecule contains 4 elements of unsaturation (degree of unsaturation) and 1h nmr peaks are between 7.0 - 8.0 ppm, what structural group is likely to be present?
Answers
A molecule's structure is likely to contain numerous double bonds, triple bonds, or rings if it has four unsaturation components. These unsaturations may be connected to different functional entities or structural elements.
The following functional groupings or structural elements could be present:
Quatre double bonds. One ring and two double bonds, such as an aromatic molecule or cycloalkene One ring and one triple bond, such as an aromatic compound with an alkyne
Four rings, such as those seen in polycyclic aromatic hydrocarbons
In the proton NMR spectrum, there are peaks between 7.0 and 8.0 ppm that are often connected to aromatic protons. In this chemical shift area, aromatic compounds, such as benzene derivatives or other aromatic rings, frequently display proton signals.
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--The complete Question is, If a molecule contains 4 elements of unsaturation, what functional groups or structural features might be present in the molecule, and what would be the likely interpretation of the peaks observed between 7.0 - 8.0 ppm in the proton NMR spectrum?--
How many moles in 3.22 g of aluminum chloride?
Answers
3.22 g containing aluminum chloride contains 0.0241486951 moles, making 1 mole of an element's atoms weigh the same as its atomic mass in grams.
Why would one use aluminum chloride?Rubber, lubricants, wood preservers, and paints are all made in large part using aluminum chloride. In both medications and pesticides, it is utilized. while melting aluminum, as a flux Antiperspirant is how you apply it.
For what purpose does deodorant contain aluminum chloride?Cosmetic and pharmaceutical goods frequently contain aluminum compounds. The components that stop sweating in antiperspirants are aluminum salts. To prevent sweat from collecting on your pores' surface, the salts must dissolve.
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What is an example of a physical change that happens inside your body?
Answers
you’re weight
hair growth
how tall you get over the years
hope this helped ! c:
1. A very small number of babies are lactose intolerant. Lactose intolerance is
much more serious in a baby than in an adult. Why do you think this is so?
Answers
Answer:
Baby's take in milk but if they are lactose intolerant they cant have milk.
according to collision theory, what three things are needed in order for a chemical reaction to occur?
Answers
Answer:
the particles must 1. collide
2. with sufficient energy
3. in proper orientation.
Explanation:
hope this helps
A donut has a density of 0.75 g/cm cubed and a mass of 100.0g. What is the volume of the donut?
Answers
Answer:
133.333333333 cm^3
Explanation:
Volume = Mass/Density
A researcher notices that atoms of an element x are releasing energy. Why does this happen?
Answers
Answer:
The atoms are affected by light.Please give me Brainliest it would mean a lot
Identify the color absorbed by a solution that appears the color given.
Blue=
Red=
Orange=
Green=
Answers
Blue = orange/yellow light (wavelengths around 450-500 nm) is absorbed by the solution that appears blue.
Red = green light (wavelengths around 550-600 nm) is absorbed by the solution that appears red.
Orange = blue light (wavelengths around 450-500 nm) is absorbed by the solution that appears orange.
Green = red light (wavelengths around 650-700 nm) is absorbed by the solution that appears green.
Give a short note on absorption.
Color absorption takes place because substances selectively absorb certain wavelengths of visible light, while transmitting or reflecting others. The color that we perceive is the result of the wavelengths of light that are not absorbed, but rather transmitted or reflected, and detected by our eyes. This phenomenon is commonly used in colorimetric analysis and can provide important information about the electronic structure and composition of a substance.
Hence, the answer is,
Blue = orange/yellow light
Red = green light
Orange = blue light
Green = red light
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Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed.
This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state?
answer choices
1s2; 2s2; 2p6; 3s2; 3p6; 4d1
1s2; 2s2; 2p6; 3s2;3p6; 3d1
1s2; 2s2; 2d6; 3s2; 3d6; 4s1
1s2; 2s2; 2p6; 3s2; 3p6; 4s1
Answers
A potassium atom's ground state electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 4s1.
What substance is electronic configuration 1s2 2s2 2p6 3s2 3p6 4s1?An atom's electron configuration is a picture of how electrons are arranged in relation to orbital shells and subshells. Consequently, this is potassium's electron configuration.
How can you express a whole electron configuration in writing?Making Electron Configurations in Writing. Write the energy level (the period) first, then the subshell that needs to be filled, and finally the superscript, which indicates how many electrons are in that subshell. The atomic number, Z, is the sum of all the electrons.
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How much work is done when 7 N of force is used to push a stalled motorbike 5 m?
Answers
Hey there!
========================================| Welcome to Physics |
Topic for Discussion - Work
========================================What is "work" when it comes to Physics?"
In physics, work is the energy transferred to or from an object via the application of force along a displacement. In short, it is the force applied to an object over distance.
The formula for work is \(W=Fs\).
\(W=work\)\(F=force\)\(s=displacement/distance\)Given the scenario above, there is "a force of 7 N on a stalled motorbike for a distance of 5 meters (m)". Now, we have to "determine the amount of work" that is being done during this
Knowing our formula for work, simply apply the given data in the scenario using the formula to determine the work being done.
\(W=Fs\)
\(F=7\)
\(s=5\)
\(W=7*5\)
\(W=35\)
Hence, the work being done in the given scenario would be 35.
__________________________________________________
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for each acid-base reaction, determine whether the equilibrium favors the starting materials or the products. click on the side of the reaction, which is favored.
Answers
Stronger/stronger weaker/weaker is indeed the reaction that is energetically preferred because acids and bases are conjugates, where the stronger acids is on the same side as that of the stronger base.
Equilibrium inside an acid-base reaction favors what?In acid-base processes, equilibrium is always in the favor of the weaker side.The pKa values for the compounds functioning as acids are displayed beneath their structures in the example below.Because the weaker acid and base are on the left, equilibrium is in the favor of the left.
How is the path of an acid-base balance determined?Finding the pKa for the acid on the left and deducting it from it allows us to utilize our pKa values to anticipate the point of equilibrium.
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Glass is typically produced by mixing sand (quartz or silica, SiO_2) with other compounds or minerals, which are then crushed, melted, and then cooled (vitrification). Given the compositions and properties of the different types of glass in the table above, consider the role each compound plays in the type of glass formed, and then complete the statements below. Match the compounds in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Adding to the mixture that undergoes vitrification produces a glass with brilliant optical properties. Adding to the mixture that undergoes vitrification produces a glass that can be used for baking purposes or storing chemical solutions. Adding to the mixture that undergoes vitrification produces a glass that is insoluble in water. Adding to the mixture that undergoes vitrification allows the glass to be produced at much lower temperatures.
Answers
Addition of soda (Na₂CO₃) to the vitrifying mixture produces glasses with excellent optical properties.
Give a brief account on silica?Silica is the common name for the compound silicon dioxide, which consists of one silicon atom and two oxygen atoms. It is an important component of many rocks, sands, and clays, and is also found in many plants and animals. Silica is used in a wide variety of products, from beer and wine to pottery, glass, and paint. It is also used in building materials such as concrete and mortar, and as a food additive. Silica is also used to make silicon-based electronics such as computer chips.
Adding lime (CaCO₃) to the vitrifying mixture creates a jar that can be used to bake or store the liquid medicine.
Addition of alumina (Al₂O₃) to a mixture undergoing vitrification produces a glass that is insoluble in water.
Addition of borax (Na₂B₄O₇) to the mixture during vitrification allows glass to be produced at much lower temperatures.
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14. In the image below, a similarity between the salad dressing and the
raisin bran is that they are both
Answers
Answer:
mixture
Explanation:
the other logical option would be compound but a compound consists of 2 or more chemically bonded elements and salad dressing nor raisin brand are elements.