The process of turning pennies into brass simply has to do with dissolving the copper in the penny by a chemical process and this is then replaced with a brass alloy and this process could theoretically be applied to other coins.
What is a coin?A coin is a tiny, flat, round piece of metal or plastic which is used as legal tender or a medium of exchange. It should be noted that they are mass-produced at a mint so as to facilitate trade, and their weight is standardized.
In order achieve various mechanical, electrical, and chemical properties, it should be noted that copper and zinc can be combined in different ratios in order to create the alloy known as brass.
The composition of other coins, such as quarters, nickels, and dimes, is different from pennies and would require different chemical processes to alter. Additionally, it is illegal to deface or alter U.S. coin currency, so it would not be legal to do this process on any other coin. In this case, it can be applied to other coins.
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If Si bonds with O, what type of bond is it? *
Answer:
covalent bond
the answer is short I don6 know why brainly is telling me it needs to be 20 characters long
PLEASE HELP ASAP!!!!
A law summarizes a set of observations about an experiment.
What exactly does the word law mean?Chemical law: Most of the properties and the atomic structure of the elements vary periodically when the elements are arranged in the order of their atomic numbers.
A sound explanation for observations is referred to as a theory. A summary of the relationship between variables constitutes a scientific law. A controlled method of testing a hypothesis is through an experiment.
The fundamental chemistry laws in chemistry are considered to be the following three: the mass conservation principle. the principle of proportional equality. A multiple proportions law.
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What is the percent by volume of isopropyl alcohol in a solution made by mixing 120 mL of the alcohol with enough water to make 350 mL of solution?
Answer: The percent by volume of isopropyl alcohol in a solution made by mixing 120 mL of the alcohol with enough water to make 350 mL of solution is 25.5%.
Explanation:
Given: Volume of solute = 120 mL
Volume of solvent = 350 mL
Now, total volume of the solution is as follows.
[tex]V_{total} = V_{solute} + V_{solvent}\\= 120 mL + 350 mL\\= 470 mL[/tex]
Let us assume that 100 mL of solution is taken and the amount of isopropyl alcohol present in it is as follows.
[tex]\frac{V_{solute}}{V_{total}} \times 100 mL\\\frac{120 mL}{470} \times 100 mL\\= 25.53 mL[/tex]
Hence, there is 25.53 mL isopropyl alcohol is present in 100 mL of solution. Therefore, %v/v is calculated as follows.
[tex]Percent (v/v) = \frac{25.53 mL}{100 mL}\\= 25.5%[/tex]
Thus, we can conclude that the percent by volume of isopropyl alcohol in a solution made by mixing 120 mL of the alcohol with enough water to make 350 mL of solution is 25.5%.
Almost all of the oxygen (O2) one consumes in breathing is converted to:
a. acetyl-CoA.
b. carbon dioxide (CO2).
c. carbon monoxide and then to carbon dioxide.
d. none of the above.
e. water.
Almost all of the oxygen (O2) one consumes in breathing is converted to: b. carbon dioxide (CO2).
When we breathe in oxygen, it is used in cellular respiration, which is the process by which our body converts glucose and oxygen into energy in the form of ATP. In the process, the oxygen is combined with the hydrogen atoms from glucose to form water, and the carbon atoms from glucose are converted to carbon dioxide (CO2) as a waste product. Therefore, almost all of the oxygen that one consumes in breathing is converted to carbon dioxide (CO2).Breathing is the process by which an organism takes in oxygen and expels carbon dioxide. In humans and other mammals, this process is accomplished through the respiratory system, which includes the nose, trachea, bronchi, and lungs. When we inhale, air is drawn into the lungs through the nose or mouth, passing through the trachea and bronchi before reaching the alveoli, which are small air sacs in the lungs where gas exchange occurs.
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Investigating Jessie's Claim
Identifying the Other Reactant
If the container was not empty when Jessie added the chlorine gas, then what could have been inside it? Below is an image
showing the reaction inside the container. There is also a table that lists some of the substances that Dr. Yung keeps in her lab.
The group of atoms that repeat to form each substance, as well as some of the properties of each substance, are included in the
table.
Procedure
1. Use the tokens and the information in the table to determine what the other reactant inside the container could have been.
2. Once you have identified the other reactant, answer the questions below.
What is the percent of S K2S?
Answer:
29.07778262 (i don't know what you have to round to, but just be aware of rounding)
Explanation:
to answer this you have to convert both elements into grams, you do this by finding their atomic weight on a periodic table then multiplying it by how many moles of the molecule you have, k=39.098 and S=32.06, so you have to multiply k by two since you have two moles, so now you know that k2=78.196. then add the two amounts together to get the total weight of the compound, 110.256, now that you have that you can create a proportion to solve for the percent, the proportion is equal to the mass of one element, in this case S, over the total weight of the compound, 110.256. then divide [tex]\frac{32.06}{110.256}[/tex] =.290777... this is your percent in decimal form, so multiply by 100 to get you percentage.
if you have any questions, leave them in the comments and i will try to answer them, if this helped, pls give brainliest
A 13.1-g sample of ice at −17.9°C is mixed with 103.5 g of water at 73.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.03 and 4.18 J/g·°C, respectively, and the enthalpy of fusion for ice is 6.02 kJ/mol.
The final temperature of the mixture when no heat loss to the surroundings is equal to 69.57 °C
What is the specific heat capacity?The specific heat capacity can be defined as the amount of heat required to increase the temperature in 1 unit of substance by 1° Celcius.
The specific heat capacity can be expressed in the form of the mentioned formula below:
Q = mSΔT
The specific heat capacity of the water, S = 4.184 J/g°C
The heat lost by water = heat gained by the ice
Heat lost by water = heat gained by the ice + heat increased by the water
m₁S₁ (T₂ - T₁) = m₂L + m₂S₂ (T₂ - T₁)
103.5 × 4.18 × (73- T) = 13.1 × (2.03) + 5 × 4.18 × (T-0)
31582 - 432.63 T = 26.59 + 20.9 T
453.53 T = 31555
T = 69.57 °C
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Give a Question/Problem for Hot and Cold Compress Pillow.
Help mee plsss
THANK you!!!
Answer:
One problem that people may encounter when using a hot and cold compress pillow is that the pillow may not stay hot or cold for a long enough period of time. This can be frustrating for people who are using the pillow to alleviate muscle pain or reduce inflammation, as they may need to continually reheat or refreeze the pillow in order to maintain its therapeutic benefits. To solve this problem, people may need to find a pillow that is better at retaining heat or cold, or they may need to use additional heating or cooling elements (such as hot water bottles or ice packs) in conjunction with the pillow.
Explanation:
Elements whose properties are between those of metals and solid nonmetals are called:
metals
neutrons
metalloids
nonmetals
Answer:
mettaliods
Explanation:
It has the both property of metal and non metal so it is called mettaliod.
Answer:
metalloids
Explanation:
they are solid at roomtempreture and alloys with metals.
examples boron,silicon,arsenic,tellurium
Which of the following individuals would be most likely to display conforming behavior?Immersive Reader
(1 Point)
A.a carpenter who has been widely praised for his work
B.the school chess champion
C.a teenage girl who thinks she is unattractive
D.a successful business executive
1.___The enthalpy of the reactants of the reaction is about:
2.___The enthalpy of the products of the reaction is about:
3.___The activation energy of the reaction is about:
4.___The heat of reaction (ΔH) of the reaction is about:
5.___The forward reaction is:
6.___Addition of a catalyst would lower the:
7.___The enthalpy of the reactants is _______than the enthalpy of the products
a. greater
b. kinetic energy
c. 200 kJ
d. 120 kJ
e. exothermic
f. endothermic.
g. 80 kJ
h. 160 kJ
I. enthalpy
j. activation energy
k. less
Answer:
1.c 2.j 3.h 4.a 5.d 6. b 7.k 8.e
Explanation:
help help help help help help help help help
Answer:
what do u need help with sir
Please help! Worth 20 points and I’ll give brainliest.
Air currents transfer energy by the method of heat transfer called
Answer:
convection
Explanation:
A student dissolved 0.178 grams of a solid monoprotic acid in water and then titrated it. They then performed the same calculation as you just did in question 2 to find the moles and they found that 0.00685 moles were neutralized. What is the molar mass of the unknown acid that was dissolved? (Hint: What are the units for molar mass?)
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 25.98g/mol is the molar mass of the unknown acid that was dissolved.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
Molar mass of unknown acid= ?
mass of unknown acid= 0.178 grams
moles of unknown acid= 0.00685 moles
Substituting the values in above formula we get
0.00685 = 0.178 ÷ molar mass
molar mass=25.98g/mol
Therefore, 25.98g/mol is the molar mass of the unknown acid that was dissolved.
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Which of the following alkenes cannot be converted into an alkyne by reacting it with bromine followed by an excess of sodium amide and then with water? X X II III DIVE, III and IV II &IX
Among the following alkenes (D) IV cannot be converted into an alkyne by reacting it with bromine followed by an excess of sodium amide and then with water.
An alkene must first be brominated by an addition reaction that produces a vicinal dibromide in order to transform it into an alkyne. All alkenes that have at least one double bond double substituted render them unsuitable for this method due to the requirement of this vicinal dibromide. This is so that the alkane can undergo a double elimination and produce an alkene, which needs at least one C-H and C-X bond. This hinders the conversion of molecule IV into an alkyne.
The dibromo alkane would change into the provided alkene by losing one unit of HBr if it were to react with bromine. However, the second beta-elimination cannot take place since there isn't hydrogen that is physically linked to the alkene carbon. So (D) IV is the right option.
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How many protons does one oxygen atom contain
Answer:
8
Explanation:
Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus
7. Convert 25.0 grams of KMnO4 to moles.
K-39.098
Mn- 54.938
0-15.999
Answer in THREE Sig Figs with Units
What is the total number of moles contained in 115 grams
of C₂H5OH?
A. 1.00
B. 1.50
C. 2.50
D. 3.00
The total number of moles contained in 115 grams of C₂H5OH is 2.50 moles .
What is the term "mole"?The term "mole" refers to the quantity of a substance that has the same amount of subatomic particles (ions, molecules, or atoms) as there are carbon atoms.
Atomic weight of carbon(C)= 12 gm
Atomic weight of Hydrogen (H)=1 gm
Atomic weight of oxygen (o)=16 gm
∴Molecula weight of C2H5OH =(12×2 + 1×6 + 16×1) gm
24 + 6 + 16 gm = 46 gm
∴ 46 gm of C2H5OH contains 1 mole
1 gm of C2H5OH contain = 1/46 moles
115 gm of C2H5OH contains = 115×1/46 moles
⇒2.5 moles
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How many hydrogen atoms are in 1 mg of aspartame?
Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0. 271 s−1. Part a part complete what is the half-life for this reaction?
After solving the equation: The half-life for this reaction is 0.693/0.271 = 2.56 s.
What is reaction?Reaction is the response of a system to an external or internal stimulus. It is the way a person or object behaves in response to a change in their environment. Reactions can be physical, chemical, or psychological. Physical reactions involve changes in the body, such as muscle tension, sweating, or heart rate.
The half-life for this reaction is the time it takes for the concentration of molecular iodine to decrease by a factor of 2, or for half of the original amount of molecular iodine to react. This can be calculated using the equation:
T1/2 = 0.693/k
where k is the first-order rate constant.
Therefore, the half-life for this reaction is 0.693/0.271 = 2.56 s.
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1. Ito ay binubuo ng apat na parte/bahag, isa na rito ang pinakamahalaga ang Lobo ng Usapan.
B. Tabloid
C. Komiks
A. Pahayagan
D. Aklat
A reaction produces 4.93 L of oxygen, but was supposed to produce 1 mol of oxygen. What is the percent yield
When only 1 mol of oxygen was intended to be produced, a process instead yields 4.93 L of oxygen. The percent yield of the reaction is 493%.
Percent yield is a measure of how much of the desired product is produced in a chemical reaction. It is calculated by comparing the actual yield of a product to the theoretical yield, which is the amount of product that would be produced if the reaction were 100% efficient.
To calculate the percent yield, you can use the formula:
= percent yield
= (actual yield / theoretical yield) x 100%
The theoretical yield of a reaction is calculated by multiplying the number of moles of reactant used by the stoichiometry of the reaction. In this case, the reaction is supposed to produce 1 mol of oxygen, which is the theoretical yield. To calculate the actual yield, we can use the Ideal gas law PV = nRT, where P is the pressure, V is the volume, n is the number of mol. Since we know that V = 4.93 L, we can use this information to find n:
= n
= (PV) / RT
The actual yield is 4.93 L of O2 or 4.93 L of any gas at STP (Standard Temperature and Pressure) is equivalent to 4.93 moles of O2.
Then we can use this information to calculate the percent yield:
= percent yield
= (actual yield / theoretical yield) x 100%
= (4.93 moles O2 / 1 mole O2) x 100%
= 493%
So, the percent yield of the reaction is 493%.
It's important to note that a percent yield of greater than 100% is usually an indication of an error in the measurement or calculation of the actual yield, or it could be an indication that the theoretical yield is incorrect.
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Why do we use an excess of aldehyde in the aldol-dehydration reaction? O to form an enolate anion O to insure that the double aldol-dehydration takes place O to react with the free radicals
O to prevent air-oxidation
Option B, Using an excess of aldehyde in the aldol-dehydration reaction is done primarily to ensure complete conversion of the reactants to the desired product.
An excess of aldehyde is used to ensure that there is a sufficient concentration of the aldehyde present in order to form the enolate anion, which is the reactive intermediate in the aldol-dehydration reaction. To achieve high yield: Using an excess of aldehyde allows for the formation of multiple enolate anions, which increases the chances of a double aldol-dehydration reaction taking place, resulting in the formation of the desired product. Using an excess of aldehyde helps aldol-dehydration to prevent this by reducing the exposure of the aldehyde to air.
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world production of ammonia is now about 30 times greater than it was in 1950 suggest why the demand for ammonia is increased
There are a few reasons why the demand for ammonia has increased over time:
Population growth: The world's population has grown significantly over the past 70 years, and as the population has grown, so has the demand for food. Ammonia is a key ingredient in the production of fertilizers, which are used to help grow crops and increase food production. As the population has increased, so has the demand for fertilizers, which has contributed to the increase in the production of ammonia.Industrialization: As more countries have industrialized and developed, there has been an increased demand for ammonia to use as a feedstock in the production of chemicals, plastics, and other industrial products.Energy production: Ammonia can be used as a source of renewable energy, and there has been an increased demand for clean energy sources in recent years. This has led to an increase in the production of ammonia for use in energy production.Environmental concerns: Ammonia can be used to reduce greenhouse gas emissions, and there has been an increased focus on finding ways to reduce environmental impact. This has led to an increase in the production of ammonia for use in environmental applications.Hope This Helps You!
what is the formula for dinitrogen pentoxide?
A)NO5
B)N5O2
C)N2O5
D)N2O7
Answer:
C) N2O5
Explanation:
Which type of plate boundary is represented at point A?
Answer:
You haven't put an image so that I can determine your answer
Explanation:
Answer:
Point A represents a location on a tectonic plate boundary. Plates X and Y represent major tectonic plates. The island of Crete; the Anatolian Plate, which is a minor tectonic plate; and the Hellenic Trench have been labeled. Arrows indicate the relative directions of plate motion.
Explanation:
The solubility of glucose (a type of sugar) is 133 g/1000mL. Would you expect a mixture made of 60 g of glucose in 500 mL of water to be saturated? Why or why not?
Answer:
yes
Explanation:
60/500 is less than 133/1000 meaning that the glucose will be able to disolve without a salute
Determine the freezing point and boiling point of a solution that has 68.4 g of sucrose
(C12H22011) dissolved in 100.g of water?
Answer:
Freezing T° of solution = - 3.72°C
Boiling T° of solution = 101.02°C
Explanation:
To solve this we apply colligative properties. Firstly, freezing point depression:
ΔT = Kf . m . i
ΔT = Freezing T° of pure solvent - Freezing T° of solution
Kf = Cryoscopic constant, for water is 1.86 °C/m
m = molality (moles of solute in 1kg of solvent)
i = Ions dissolved in solution
Our solute is sucrose, an organic compound so no ions are defined. i = 1.
Let's determine the moles: 68.4 g . 1mol/ 342g = 0.2 moles
molality = 0.2 mol / 0.1kg of water = 2 m
We replace data: ΔT = 1.86°C/m . 2m . 1
Freezing T° of solution = - 3.72°C
Now, we apply elevation of boiling point: ΔT = Kb . m . i
ΔT = Boiling T° of solution - Boiling T° of pure solvent
Kf = Ebulloscopic constant, for water is 0.512 °C/m
We replace:
Boiling T° of solution - Boiling T° of pure solvent = 0.512 °C/m . 2 . 1
Boiling T° of solution = 0.512 °C/m . 2 . 1 + 100°C → 101.02°C
What information does the percent composition of an atom in
a molecule give?
The relative number of atoms one element
contributes to a molecule
B. The total number of atoms of that element in a molecule
• C. The total mass that element contributes to a molecule a
O
D. The relative amount of mass an atom contributes to
a molecule
Answer:
I think Option no D is the suitable answer