Metal that won't be oxidized:
Metal that will not be able to oxidize by any of the other metals is gold.
What causes oxidation to happen?
This chemical reaction might take place in the air or after the metal has been in contact with acids or water. The most prevalent example is corrosion of steel, which occurs when the iron molecules on the surface of steel change into iron oxides, most frequently Fe2O3 and Fe3O4.
If you've ever seen a rusted-out vehicle or corroded metal bits, you've witnessed oxidation in action.
Metals that don't oxidize:
In their native condition, noble metals like platinum or gold resist oxidation. Ruthenium, rhodium, palladium, silver, osmium, and iridium are more examples of these metals. Humans have developed a wide variety of corrosion-resistant alloys, including brass and stainless steel.
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Which statement is always true about a reversible chemical reaction?
A.
The concentration of reactants is higher than that of the products.
B.
The products can form reactants, and the reactants can form products.
C.
The concentrations of reactants and products are not constant.
D.
The concentration of the products is higher than that of the reactants.
Answer: b
Explanation:
A sample of gas has its number of molecules quadrupled, its Kelvin temperature doubled, and its volume tripled. By what factor has the new pressure changed relative to the original pressure
The new pressure changed relative to the original by a factor of 8/3.
What is the change in the pressure?Using the ideal gas equation;
PV = nRT
P = pressure
V = volume
n = number of moles
R = gas constant
T = temperature
P1 = nRT/V
P2 = 4n * R * 2T/3V
Hence;
P2/P1 = 4n * R * 2T/3V ÷ nRT/V
P2/P1 = 4n * R * 2T/3V * V/nRT
P2/P1 =4 * 2/3
= 8/3
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Which answer best describes what is happening in the following reaction?
2C8H18 + 25O2 Right arrow. 16CO2 + 18H2O
This is not a redox reaction. It is an example of combustion.
This is a redox reaction in which octane (C8H18) is the reducing agent.
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
This is not a redox reaction, because a solution of carbon dioxide and water results.
A. This is not a redox reaction. It is an example of combustion.
Combustion reaction of hydrocarbonDuring the combustion of a hydrocarbon, the hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.
Example of combustion reaction2C8H18 + 25O2 → 16CO2 + 18H2O
Thus, we can conclude that, this is not a redox reaction. It is an example of combustion.
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Answer:
A: This is not a redox reaction. It is an example of combustion.
Explanation:
What type of cleaning agent should be used to clean a laminar flow hood?
a. 70% Isopropyl Alcohol.
b. 90% Ethyl Propyl alcohol.
c. 90% Isopropyl Alcohol.
d. 50% Ethyl Propyl alcohol.
The type of cleaning agent that should be used to clean a laminar flow hood is 70% Isopropyl Alcohol.
Isopropyl alcohol is mixed with water for use as a rubbing-alcohol antiseptic. It is also utilized in aftershave creams, hand lotions, and other cosmetics. In enterprise, it is used as a less expensive solvent for cosmetics, drugs, shellacs, and gums, in addition to denaturing ethanol (ethyl alcohol).
Isopropyl alcohol is a colorless, flammable chemical compound with a robust alcoholic smell. As an isopropyl institution related to a hydroxyl group, it's far the handiest example of a secondary alcohol, wherein the alcohol carbon atom is connected to 2 other carbon atoms.
Isopropyl alcohol is pure alcohol and is a colorless liquid with a musty, sharp odor. There are no other components in a bottle of isopropyl alcohol. through assessment, rubbing alcohol consists of isopropyl alcohol among different components, including water. maximum rubbing alcohol manufacturers incorporate 70% isopropyl alcohol.
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According to the modern periodic law the properties of elements are periodic function of their
Potassium secretion is linked to:________.
a. sodium reabsorption
b. glucose reabsorption
c. sodium secretion
d. chloride reabsorption
e. chloride secretion
Vinegar contains carbon, hydrogen, and oxygen with percent masses of 40.01% C, 6.70% H, and 53.29% O, respectively. Determine the empirical and molecular formulas of the compound. The molar mass of vinegar is about 60 g/mol. HOW DO WE GET THERE
The empirical formula is = C2H4O2
Molecular formula=C2H4O2
Calculation of Molecular formula and empirical formula:-Vinegar has three elements:
oxygen = 53.29%,
hydrogen = 6.70%,
and carbon = 40.01%.
We can create an equation for the total mass of vinegar with 'a' carbon atom,' b' hydrogen atom, and 'c' oxygen atoms using the molar masses of C, H, and O.
12*a + 1*b + 16*c = 60
We also know that C makes up 24 g/mol, or 40.01 percent, of the overall mass of 60 g/mol.
The formula contains two C atoms because each C atom has a molecular mass of 12 g/mol. You may determine that the formula contains 4 H and 2 O atoms by using the same reasoning for H and O.
The empirical formula is = C2H4O2
Molecular formula= (C2H4O2)n
(4 x 12 + 1 x 4 + 16 x 2)n = 60
(84)n = 60
n=60/84
n=0.71=1
Molecular formula=C2H4O2
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_____ was the first expert system developed to determine the chemical structure of molecules.
Answer:
Dendral was the first expert system developed to determine the chemical structure of molecules.
In 1869, mendeleev created a periodic table in which elements were ordered by weight and placed in groups based on their chemical properties. mendeleev's decision to design the periodic table in this way allowed immediate advances in chemistry by.?
a.) providing an explanation for the reactive properties of the alkali metals
b.) providing a framework for models of electron configurations
c.) predicting the existence of a group of undiscovered inert gases
d.) predicting the properties of undiscovered elements in specific atomic weight ranges.
please explain
Answer:
D
Explanation:
Mendeleev periodic table predicted the properties of undiscovered element like the eka-aluminium.
The elements of the group IA are termed as alkali metals, because their ___ are alkaline.
The answer is hydroxides.
The elements of the group IA are termed as alkali metals, because their hydroxides are alkaline.
Place the items in order from lowest to highest degree of internal organization
The order of internal organization from lowest to highest degree is; cell < tissue < organ < organ system
What is the order of organization?The complexity of the parts that compose an organism lays the bedrock for the classification of life. Some organisms are composed only of one cell while others are composed of many complex systems.
The order of internal organization from lowest to highest degree is; cell < tissue < organ < organ system
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Missing parts:
Place the items in order from lowest to highest degree of internal organization.
1.organ system
2.tissue
3.cell
4.organ
Lead crystallizes in the face-centered cubic lattice. What is the coordination number for pb?.
The coordination number for pb will be 12
Four atoms make up each unit cell of the face-centered cubic (fcc), which has a coordination number of 12. Two atoms make up each unit cell of the body-centered cubic (bcc), which has a coordination number of eight.
What is Coordination number ?The number of atoms, ions, or molecules that a central atom or ion in a complex, coordination compound, or crystal holds as its closest neighbours.
The number of nearby atoms or ions that surround an atom or ion is known as the coordination number. The coordination number for FCC and HCP systems is 12.Tetracarbonylnickel, Ni(CO)4, for instance, has a coordination number of 4 due to the four CO ligands that are bonded to the Ni atom.Learn more about Coordination number here:
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How many molecules of zinc oxide are there in a 2 kg (2,000 g) sample?
Answer:
1.48 x 10²⁵ molecules ZnO
Explanation:
To find the amount of molecules, you need to (1) convert grams to moles (via molar mass) and then (2) convert moles to molecules (via Avogadro's Number). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.
Molar Mass (ZnO): 65.380 g/mol + 15.998 g/mol
Molar Mass (ZnO): 81.378 g/mol
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
2,000 g ZnO 1 mole 6.022 x 10²³ molecules
--------------------- x ----------------- x --------------------------------------- =
81.378 g 1 mole
= 1.48 x 10²⁵ molecules ZnO
Draw the major product formed in the reaction of an epoxide with methoxide in methanol.
the major product of the reaction is (2S,3R)-3-methoxy-3-methylpentan-2-ol.
Epoxy, epoxide, oxirane, and ethoxyline are all names for substances that contain the epoxide functional group. Oxides are a common name for simple epoxides. Consequently, ethylene oxide is the epoxide of ethylene (C2H4).
Reaction and explanation.
In order to answer this question, we must draw the main product and the studio chemistry. Yeah. Therefore, we will begin by drawing the reactant, which is an oxide.
As with this structure. Therefore, C. S. is applied to this epoxy side. Three ohs and two hash marks. As a result, the oxygen will be presented with the lone pair on the initial stage. And after that, we will receive the prototype for a thirty-plus-year-old product. And everything else will proceed as usual, even this.
Now this bond will be severed, and three miners from O. C. S. will attack from the back, in which case we will receive the finished product as seen here.
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(2S,3R)-3-methoxy-3-methylpentan-2-ol is the reaction's main product.
Epoxide functional group-containing compounds go by the names epoxy, epoxide, oxirane, and ethoxyline. Simple epoxides are frequently referred to as oxides. As a result, ethylene oxide is ethylene's epoxide (C2H4).Reaction and justification.We must illustrate the primary product and the studio chemistry in order to provide a response. As a result, we shall start by drawing the oxide reactant.similar to this structure C. S. is therefore applied to this epoxy side. Two hash marks and three OHs. As a result, on the initial stage, the oxygen will be presented with the sole pair. Then we will get the prototype for a product that has been around for more than thirty years. And even this will occur according to plan.This relationship will now be broken, and three O. C. S. miners will assault from behind, resulting in the finished article you see here.To learn more about epoxide visit:
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15. What is the mass of mercury in a 250 g fish if the ppm was measured to be 0.23?
Answer: The mass of mercury will be 57.5 micrograms.
The given question deals with Analytical Chemistry where Concentration is asked here.
Concentration: Generally concentration is defined as amount of the substance per unit volume. Concentration is also expressed in parts per million(ppm) when it is a small quantity as in case of mercury content in fish.
Explanation: Given mass of the fish = 250 g,
ppm = 0.23
Now mass of mercury = 0.23 ppm × 250 g
= 0.23/1,000,000 × 250g
=0.23×250/1,000,000 g
= 0.0000575 g
=57.5 micrograms
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H. If you had 64 amu of ch4, how many molecules would this be? i. If you had 64 g of ch4, how many moles would this be?
The number of molecules and number of moles of [tex]CH_{4}[/tex] is 4 moles and 24.088×[tex]10^{23}[/tex] molecules.
Calculation,
Atomic mass of carbon is 12 u and H is 1 u
So, molar mass of [tex]CH_{4}[/tex] = 12 + 1×4 = 16 u = 16 g/mole
Number of moles = given mass / molar mass = 64 g/ 16 g/mol = 4 moles
1 moles of substance contains 6 .022 ×[tex]10^{23}[/tex] molecules.
So, number of molecules in 3 moles of methane = 4×6.022 ×[tex]10^{23}[/tex]
number of molecules in 3 moles of methane = 24.088×[tex]10^{23}[/tex] molecules.
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Read the chemical equation.
n2 + 3h2
2nh3
using the volume ratio, determine how many liters of nh3 is produced if 3.6 liters of
h2 reacts with an excess of n2, if all measurements are taken at the same
temperature and pressure? (5 points)
1) 5.4 liters
2) 2.4 liters
3) 1.8 liters
4) 1.2 liters
The volume of [tex]NH_3[/tex] that will be produced is 2.4 liters. The correct option is 2.
Volume ratioThe equation of the reaction goes thus: [tex]N_2 + 3H_2 --- > 2NH_3[/tex]
The ratio of H2 to NH3 is 3:2.
Thus, with 3.6 L of H2, the volume of NH3 that will be produced is:
2/3 x 3.6 = 2.4 liters.
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Which is the site of gaseous exchange in the lungs?
Write the relationship between displacement, velocity and time?
Explanation:
1. The gaseous exchange in the lungs occurs in the alveoli. They are tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
please help me with this questio
The mass of the precipitate is 8.74 g and the concentration of the calcium nitrate is 0.061 M.
What mass of precipitate is formed?The reaction is given by; 2AgNO3(aq) + CaCl2 (aq) ------>2AgCl(s) + Ca(NO3)2(aq)
Number of moles of AgNO3 = 195/1000 * 0.500 = 0.0975 moles
Number of moles of CaCl2 = 305/1000 * 0.100 = 0.0305 moles
If 2 moles of AgNO3 reacts with 1 mole of CaCl2
0.0975 moles reacts with 0.0975 moles * 1 mole / 2 moles = 0.04875 moles
Thus CaCl2 is the limiting reactant.
1 mole of CaCl2 produces 2moles of AgCl
0.0305 moles produces 0.0305 moles * 2 moles/ 1mole
= 0.061 moles
Mass of precipitate = 0.061 moles * 143.32 g/mol
= 8.74 g
Now 1 mole of CaCl2 produces 1 mole of Ca(NO3)2
Total volume of solution = 195 ml + 305 ml = 500 ml or 0.5 L
Concentration of Ca(NO3)2 = 0.0305 moles/ 0.5 L
= 0.061 M
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(a) List any four properties of colloidal and mention any two properties in which colloids differ from suspension. (b) State what is Tyndall effect? Which of the following solution will show Tyndall effect? Starch solution, sodium chloride solution, tincture iodine, air, milk
Explanation:
(1) they are heterogenous mixture
(2) the size of particles of colloids is too small to be seen by bare eyes.
(3) they scatter light passing through them making it's path visible.
A saturated solution of baso4 has a concentration of 0.5mol/l. a 55ml sample is taken by you. what is the mass of baso4 in the solution
Answer:
6.4 g BaSO₄
Explanation:
You have been given the molarity and the volume of the solution. To find the mass of the solution, you need to (1) find the moles BaSO₄ (via the molarity ratio) and then (2) convert moles BaSO₄ to grams BaSO₄ (via the molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs to reflect the sig figs of the given values.
Molarity (mol/L) = moles / volume (L)
(Step 1)
55 mL / 1,000 = 0.055 L
Molarity = moles / volume <----- Molarity ratio
0.5 (mol/L) = moles / 0.055 L <----- Insert values
0.0275 = moles <----- Multiply both sides by 0.055
(Step 2)
Molar Mass (BaSO₄): 137.33 g/mol + 32.065 g/mol + 4(15.998 g/mol)
Molar Mass (BaSO₄): 233.387 g/mol
0.0275 moles BaSO₄ 233.387 g
--------------------------------- x ------------------- = 6.4 g BaSO₄
1 mole
state and appearance sodium chloride
Sodium chloride is white, crystalline solid at room temperature.
Sodium chlorideIt is a compound whose components atoms are sodium and chlorine.
The atoms of the two elements combine chemically through an ionic bond. The sodium donates it valence electron to the chlorine atom.
Thus, sodium chloride is an ionic compound. It has a characteristic white appearance and crystalline structure.
The compound is a solid at room temperature. It has a melting point of 801 °C.
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Pls Help!
A sample of seawater from a tidal estuary was found to contain a concentration of 727 mg of chloride ion per kg of seawater. If the density of the sample was 1.035 g/mL, what is the molarity of the chloride ion?
The molarity of the chloride ion is 2.0 * 10⁻⁵ M.
What is the molarity of the chloride ion?The molarity of the chloride ion is calculated using the formula below:
Molarity = (Percentage concentration * Density ) / (Molar mass * 100)The percentage concentration of chloride ion = 727/kg * 10⁻⁶ Kg * 100/1
The percentage concentration of chloride ion = 0.0727%
Molar mass of Chloride ion = 35.5 g/mol
Molarity = (0.0727 * 1.035)/(35.5 * 100)
Molarity of chloride ion = 2.0 * 10⁻⁵ M
In conclusion, the molarity of the chloride ion is obtained from the density and percent concentration of chloride ions in seawater.
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Which models of the atom from task 1 are not supported by rutherfords experimental evidence?
Model not supported is:
Thomson's atomic model of the atom from task 1 are not supported by Rutherford's experimental evidence.
Experiments given by Thomson, Rutherford & Dalton:
The cathode ray tube experiments of J.J. Thomson demonstrated that all atoms contain minute, electron-like subatomic particles that are negatively charged.The plum pudding model of the atom was put up by Thomson and featured negatively charged electrons embedded within a positively charged "soup."The majority of an atom is empty space, with a small, dense, positively-charged nucleus, as demonstrated by Rutherford's gold foil experiment.Rutherford postulated the nuclear model of the atom in light of these findings.Atoms, in Dalton's opinion, are the tiniest pieces of matter that can never be further divided. This belief persisted up until the time it was learned that the atom was made up of subatomic particles.Dalton and Thomson's concepts are in conflict with the experimental findings of Rutherford. Dalton's model is unsupported by evidence because it does not include electrons, protons, or neutrons.
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? Question
The article mentions that the difference in the responses of men and women to the research study could be due to
confirmation bias. Use the Internet to look up "confirmation bias." Which of the following statements could support the
view that the difference is due to confirmation bias?
Select all the correct answers.
Many of the men may believe that they are fair and unbiased against women.
Many of the women may already believe that they face biases.
More men than women participated in the study.
The men who participated in the study were younger than the women.
Many of the men may believe that they are fair and unbiased against women.
Many of the women may already believe that they face biases.
What is confirmation bias ?
The propensity to seek for, understand, favor, and remember information that supports or confirms one's preexisting opinions or values is known as confirmation bias. People exhibit this bias when they choose facts that support their opinions while rejecting those that contradict them or when they interpret ambiguous facts as supporting their preexisting beliefs. Although confirmation bias cannot be completely avoided, it can be controlled, for instance, by critical thinking education and training.
Confirmation bias has been linked to poor decisions in the scientific, organizational, financial, and political spheres. These biases can preserve or reinforce views in the face of contradictory data and contribute to overconfidence in personal opinions.
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Answer:
Many of the men may believe that they are fair and unbiased against women.
Many of the women may already believe that they face biases.
Explanation:
At the stoichiometric (equivalence) point in a titration of benzoic acid with naoh(aq) shown by equation 3, the ph is:_______
Benzoic acid is one of the weakest acid for titration. The pH of the salt solution generated is the pH greater than 7( >7 ) at the equivalence point in any titration.
The benzoate anion, combines with water to create OH- and undissociated benzoic acid. This reaction is stronger than OH-. As a result of the hydroxide ions generated by this reaction, the final solution has a pH greater than 7. Hydrolysis is the term for an ion's reaction with water, such as the benzoate ion.
What is titration?A titration is a method for figuring out the concentration of an unknown solution by using a solution with known concentration.Until the reaction is finished, the titrant (the known solution) is typically added from a buret to a known volume of the analyte (the unknown solution).The concentration of the unknown can be determined by knowing the amount of titrant that was added. An indicator is frequently used to indicate the reaction's endpoint or end of the reaction.Know more about titration numerical https://brainly.com/question/14501686
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If you remove two protons and two neutrons from a gold atom (au), what new element is formed (if any)?
Answer: Iridium
Explanation:
The atomic number of Iridium is 77.
The element we obtain if we remove two protons and two neutrons from the gold is iridium. The atomic number of gold is 79 and that of iridium is 77.
What is iridium?Iridium is the 77th element in the periodic table. It is a transition metal like gold, silver, platinum etc. Iridium is a d-block metal and have its valence electrons in d-orbital.
Gold is 79th element and it is also a transition metal. Gold is a precious metal used in making ornaments and its having high cost.
The atomic number of gold is 79 and it have 79 electrons and 79 protons. The atomic number of an element is the number of its protons and the mass number of the element is the sum of number of electrons and number of protons.
If we remove two protons from the 79 protons of gold the proton number becomes 77 and thus the atomic number. The elements with the atomic number 77 is iridium.
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Iansiqnsdijsijnweijnjwn
Answer:
What is your question?
Explanation:
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???
Answer:
Stan TXT
Explanation:
because they are amazing
Elements on the periodic table are arranged in order by their
Answer:
in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass
livesciencecom
When exothermic reactions occur, ______________.
i. heat energy is absorbed.
ii. water is produced.
iii. heat energy is released.
iv. oxygen is produced.
Answer:
heat energy is released into the surrounding