Is pewter OK in water?
Although frequent handling and living near seawater can cause pewter to oxidize and discolor, pewter does not tarnish like silver and copper. Warm, soapy water can be used to clean pewter. After rinsing, the metal can be towel dried.
In water, is pewter safe?Lead-free and secure to use, modern pewter. It is primarily comprised of tin, with some antimony and copper. The goods are guaranteed to be lead-free and are perfectly safe to be used for all types of food and beverages, claims one maker.
Lead content in antique pewter?30 percent lead and 70 percent tin were the main components of ancient pewter. With time, this pewter, sometimes known as black metal, darkened significantly, and lead rapidly leached out when it came into touch with acidic foods.
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Chemistry
Can you answer these for me please
Among the given elements, fluorine is the most electronegative and the outer shell electrons are greatly attracted y the nucleus for the same reason, fluorine is more reactive than bromine. magnesium is more reactive than calcium because, Ca contains more inner electrons and experience shielding effect.
What is electronegativity?Electronegativity is the ability of an atomic nucleus to attracts its own electrons as well as the bonded electrons. Fluorine is the most electronegative element in periodic table.
F is more prone to be reactive since it needs gain an electrons to achieve stability. Cl has the same number valence electrons and but it contains more inner electron which shield each other. The most electronegative F will be more reactive in the group. For the same reason F is more reactive than Br also.
Potassium is more reactive than lithium because, potassium contains more loosely bound electron in its valence shell. Hence, it can be easily lose that electron through chemical bonding.
Magnesium is less reactive than Ca because, its valence electrons are more close to the nucleus. Whereas, Ca has one more shell in which the valence electrons are located which can be easily participated in bonding.
Similarly, oxygen is more reactive than sulfur, because, oxygen is highly electronegative and it tends to gain two electrons by reaction.
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Carbon-14 has a half-life of 5,730 years. If a sample contained 80 mg originally, how much is left after 17,190 years? Show your work for complete credit.
Answer: 10 mg
Explanation:
First, take 17,190 divided by 5730 = 3 half-life
We know that after each half-life, the sample will decrease by half
80 mg = 0 half-life
40 mg = 1 half- life
20 mg = 2 half-life
10 mg = 3 half-life
Why is ethane rarely used as a fuel?
Answer:
its because due to The lack of awareness is the major barrier for using ethane as a transportation fuel.
Explanation:
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brainliest for the brains:)
a student wanted to determine the order with respect to a green food dye for the reaction between the dye and bleach. what change to the procedure that you performed would the student have to make?
A plot of ln(Abs) vs. time shows a straight line, indicating that the order with regard to the dye is "first order." The sequence of the reaction with respect to the bleach can be determined by looking at the rate constants and bleach volume.
What happens when food colouring is mixed with bleach?When household bleach and a green food coloring solution are combined, the yellow dye component is first oxidized, leaving just the blue coloring.
Which reactant is in excess when the rate of reaction of bleach and dye is studied?One reactant's concentration will be maintained in excess. The dye may be thought of as the only reactant influencing rate as long as OCl is kept in excess.
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What do you think a ion is
Culinary emulsion can disperse fat into the water, but it cannot disperse water into the fat.
a. True
b. False
Culinary emulsion can disperse fat into the water, but it cannot disperse water into the fat. The sentence is True.
The two types of culinary emulsions are fat dissolved in water and water dissolved in fat. The emulsions of fat and water that are most frequently used are hollandaise, mayonnaise, aioli, milk, and pan sauces. The most typical forms of water in fat emulsifications are vinaigrettes and whole butter. The vinaigrette is made by mixing vinegar and oil. Mayonnaise is typically made with egg yolks and oil. Aioli is made with garlic and oil. Milk sauces can be made with any type of milk, but are mostly commonly seen in cream sauces. The fat in butter is emulsified with water. The butter is created when the butterfat is emulsified with salt and water.
Therefore, the given statement is right.
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Answer: its false
Explanation: got it right on test
When dichlorocarbene is generated in the presence of an atkene. a dichlorocyclopropane is formed. Write the complete stepwise mechanism for the formation of dichlorocarbene, CCl2. Show all intermediate structures and show all electron flow with arrows. Draw the complete Lewis electron dot structure for dichlorocarbene, CCl2.
Dichlorocarbene is an intermediate species which is formed from the reaction of trichloromethane with a base. The intermediate CCl₃ further loss a Cl formes CCl₂.
What is dichlorocarbene?The reactive intermediate with the chemical formula CCl₂ is called dichlorocarbene. Despite not having been isolated, this chemical species is a typical intermediate in organic chemistry since it is produced from chloroform. This twisted diamagnetic molecule enters other bonds quickly.
Carbenes contains two electrons in their valence shell and they are highly reactive and therefore used in many synthetic reactions.
CHCl₃ on reaction with a strong base such as NaOH produce the intermediate anion CCl₃⁻ by the elimination of water molecule. This trichlorocarban further eliminates one Cl forms dichlorocarbene.
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What is the maximum amount of sugar that will completely dissolved in 20 mL of water?
To get a saturated solution, we must dissolve 200 divide by 100 multiply by 20 grams of sugar in 20 l of water. The alternative to this statement is 40 grams of sugar.
Describe saturated solution and provide an example.The highest concentrations of an immediately following in the solvent is called a saturated solution, and any more solute will not breakdown in a liquid medium. Example: A sugar solution.
What causes a saturated solution to form?The sodium ions leave the exterior of the solids when a solvent containing the solute is added, becoming solvated by the solution and initially creating an imbalanced solution. The solution reaches saturation when the maximum amount of solute that can dissolve has done so.
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How to calculate the RMS value?
Square each value, add up the squares (which are all positive) and divide by the number of samples to find the average square or mean square. Then take the square root of that.
What is RMS value?In math and its applications, the root mean square of a bunch of numbers is characterized as the square foundation of the mean square (number-crunching mean of squares) of that set. RMS, likewise called root mean square, is an extraordinary instance of summed up mean. The RMS worth of a constantly shifting capability can be characterized as the basic of the square of the prompt worth more than one cycle.
For AC current, RMS rises to the worth of consistent DC current that delivers a similar power utilization with a resistive burden. In assessment hypothesis, the root mean square blunder of an assessor is a proportion of the blemish of the assessor's fit to the information.
Square each worth, include the squares (which are positive) and separation by the quantity of tests to view as the normal square or mean square. Then, at that point, take the square base of
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Does lemon juice rust metal?
Yes, lemon juice can cause rust on some metals. Lemon juice is acidic and can corrode some metals, such as iron and steel, when left exposed to air.
What do you mean by Rust?
Rust is a general term for iron oxide, a chemical compound that forms when iron and oxygen react with each other in the presence of water or air moisture. It is a reddish-brown corrosion product that is formed on the surface of metals that contain iron. Rust is an example of corrosion, which is the breakdown of materials due to chemical reactions with their environment.
Lemon juice is acidic and contains citric acid, which can corrode some metals, such as iron and steel, when left exposed to air. The acid in lemon juice reacts with the metal surface, causing the metal to rust. The rusting process can be accelerated by the presence of oxygen, moisture, and salt. The more acidic the lemon juice, the more likely it is to cause rust.
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What is the ratio of rms velocity?
The ratio of root mean square velocity to average velocity of a gas molecule at a particular temperature is: 1.086:1.
What is ratio of RMS velocity yo average velocity of gas molecule?
RMS is root mean Square can be defined as square root of the mean square. It is the arithmetic mean of the squares of group of values.
In kinetic theory of gases, the RMS of the speed pf particles in a gas can be defined by
Vrms= √ 3RT/M
T is the temperature
R is the gas constant
M is the molar mass of the gas
Calculation:Here, we will apply Maxwell-Boltzmann Distribution,
Given Vrms= √(3RT/M)
Average speed Vavg= √8RT/πM
Thus, dividing the two
Vrms/Vavg = √(3RT/M )/(8RT/πM)
Vrns/Vavg = √3π/8
Vrms/Vavg=1.086:1
The ratio of root mean square velocity to average velocity of a gas molecule at a particular temperature is: 1.086:1.
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How do you find the pH of a HBr solution?
Therefore, the pH of the solution is -9 + log([HBr]/[HBr]) = -9 + log(1) = -9.
What is solution?Solution is a term used to describe the answer or resolution to a problem, challenge, or inquiry of some kind. It is an act or means of solving a problem or reconciling differences. A solution may also involve setting a goal or plan of action to reach the desired outcome. Solutions are often creative and require collaboration from multiple individuals or groups. Solutions can also be found in the form of products, services, or information.
The pH of a HBr solution can be found by using the Henderson-Hasselbalch equation, which states that pH = pKa + log([salt]/[acid]). In this case, the pKa of HBr is -9 and the molar concentration of HBr is [HBr].
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50 Points
A sample of hydrogen was prepared and collected over water at 25 °C and a total pressure of 742 torr. It occupied a volume of 288 mL. Calculate its partial pressure (in torr) and what its dry volume would be (in mL) under a pressure of 1.00 atm.
The partial pressure of the hydrogen is 718.24 torr
The volume of the hydrogen is 273.6 mL
What is the partial pressure?We know that the partial pressure is the pressure of a gas that is part of a mixture of gases. Following the law of the partial pressures, it is clear that the number of gases that can be mixed would give rise to the combination of gases that we can call a mixture of gasses.
The total pressure of the mixture of gases can be obtained by the use of the formula that was deduced from the Dalton's law of partial pressures.
Vapor pressure of water in torr = 23.76 torr
Partial pressure of the hydrogen = 742 torr - 23.76 torr
= 718.24 torr
Pressure in atm = 0.95 atm
From the Boyle's law to get the volume;
[tex]P_{1}[/tex][tex]V_{1}[/tex] = [tex]P_{2}[/tex][tex]V_{2}[/tex]
[tex]V_{2}[/tex] = 0.95 atm * 288/1.00 atm
[tex]V_{2}[/tex] = 273.6 mL
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Why RMS value is calculated?
RMS value is calculated because it helps to find the effective value of AC (voltage or current).
What is RMS value?In science and its applications, the root mean square of a bunch of numbers is characterized as the square foundation of the mean square of the set. RMS, likewise called root mean square, is an extraordinary instance of summed up mean. The RMS worth of a ceaselessly changing capability can be characterized as the fundamental of the square of the momentary worth more than one cycle.
For AC current, RMS rises to the worth of steady DC current that delivers a similar power utilization with a resistive burden. In assessment hypothesis, the root mean square mistake of an assessor is a proportion of the defect of the assessor's fit to the information.
RMS value is calculated because it helps to find the effective value of AC (voltage or current).
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What bacteria grows in juice?
The most common bacteria found in juice are Listeria monocytogenes, Escherichia coli, Salmonella, and Staphylococcus aureus.
What is Bacteria?
Bacteria are single-celled microorganisms that exist in their millions, in every environment, both inside and outside other organisms. Bacteria are the most diverse group of organisms on earth, and are believed to be one of the earliest forms of life. They can cause diseases, but can also be beneficial to humans, such as by producing food and vitamins, breaking down organic matter, and helping the body digest food.
Bacteria grows in juice because juice typically contains organic matter and moisture, which provide nutrients and an environment in which bacteria can thrive. Additionally, some types of juice may contain natural sugars and other ingredients which can further encourage bacterial growth.
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A mixture of nitrogen and hydrogen was allowed to come to equilibrium at a given
temperature.
3H2 + N2 2NH3
An analysis of the mixture at equilibrium revealed 2.1 mol N2, 3.2 mol H2, and 1.8 mol NH3.
How many moles of H2 were present at the beginning of the reaction?
A) 3.2
B) 4.8
C) 5.0
D) 5.9
E) 4.4
The number of moles of the hydrogen at the beginning is 5.0. Option C
What is the amount of the hydrogen gas at the beginning?In this case, we have that the system does include the hydrogen gas, the nitrogen gas and the ammonia gas. The analysis of the mixture has shown the amount of each of the species that we have at equilibrium.
All we need to do is to look at the amount of the ammonia that we have at the point of equilibrium and this would give us the value of M. We would then have that at equilibrium;
3.2 = M - (1.8)
M = 3.2 + (1.8)
M = 5.0
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The loss of a beta particle by a radioactive nuclide causes an INCREASE in the atomic number. True or False?
Answer:
False
Explanation:
Beta particles are electrons...which do not affect the atomic number...losing a beta particle will not change the atomic number.
The atomic number is determined by the number of PROTONS in the matter.
( ALPHA particles will change the atomic number as they have protons in them)
The following
compound, lited with their boiling
point, are liquid at -10°C: butane, -0. 5°C;
ethanol, 78. 3°C; toluene, 110. 6°C. At -10°C,
which of thee liquid would you expect to
have the highet vapor preure? Which the
lowet? Briefly explain
The given question is incomplete, and hence, can not be answered. Still, adding some relevant information for your reference.
What is vapor pressure?
Vapor pressure , or equilibrium vapor pressure, is the pressure produced by a vapor in thermodynamic equilibrium with a condensed phase (solid or liquid) at a given temperature. Defined as applied pressure. temperature in a closed system. Equilibrium vapor pressure is a measure of the evaporation rate of a liquid. This refers to the tendency of particles to escape from liquids (or solids). Substances that have a high vapor pressure at room temperature are often called volatile. The pressure that vapor exerts on the liquid surface is known as vapor pressure. As the temperature of a liquid increases, so does the kinetic energy of its molecules. As the kinetic energy of the molecules increases, the number of molecules that become vapor also increases, increasing the vapor pressure.
The given question is incomplete, and hence, can not be answered. Still, adding some relevant information for your reference.
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True/False. A characteristic of a good cardiac biomarker is that it is normally present in a HIGH concentration in the peripheral blood.
Good cardiac biomarkers typically have a HIGH concentration in the peripheral blood, which is one of their distinguishing traits.
A biomarker that accurately predicts heart injury is one that is normal. The cardiac biomarker levels in your blood are determined by this test. Enzymes, hormones, and proteins are some examples of these markers. After your heart has been put under a lot of stress and has become harmed from not getting enough oxygen, cardiac biomarkers become visible in your blood. This could be the result of a heart attack.
Cardiac indicators are biomarkers that can be used to assess heart health. They may be helpful in the early diagnosis or prediction of disease. Even though they are frequently mentioned in relation to myocardial infarction, other diseases can cause an increase in cardiac.
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a parent nucleus 82x227 decays 6 particles and 5 electrons (e-). what then is the z value for the daughter nucleus y?
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, the z value for the daughter nucleus y is 14.5.
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle.
₈₂²²⁷X[tex]\rightarrow[/tex] 6 Y + 5 ⁰₋₁e
total atomic number on left side= total atomic number on right side
82= 6(atomic number of Y)+5(-1)
82=6(atomic number of Y)-5
87=6(atomic number of Y)
atomic number of Y= 14.5
Therefore, the z value for the daughter nucleus y is 14.5.
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balance the reaction equation with the lowest set of whole number coefficients. what is the coefficient (d) of h2o? a c4h10 b o2 ---> c co2 d h2o
The coefficient for the balanced chemical equation 2C4H10 + 13O2 ---> 8CO2 + 10H2O is 10.
Every chemical equation can be balanced by following some simple steps and rules.
- Count any element on both sides, while paying attention to all numbers that modify this element’s count in a certain occurrence. If one side has fewer of this element than the other one, add multipliers in front of the molecules that contain this element.
- Go back to step one and repeat with a different element. In complicated cases, you might need to do an element twice or even more often.
- When you are sure everything is balanced, look at the equation again and try to find a greatest common divisor among all multipliers.
so following these rules, we got the stoichiometrically balanced equation.
2C4H10 + 13O2 ----> 8CO2 + 10H2O
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the epa threshold for acceptable levels of lead ions in water is <15 ppb . what is the molarity of an aqueous solution with a concentration of 15 ppb ?
Molarity of an aqueous solution is 15ˣ10⁻⁷M. if the concentration of an aqueous solution 15ppb.
Molar concentration or Molarity is characterized as the quantity of moles of solute present in an unmistakable measure of liters of the arrangement, that is to say, moles per liters of an answer.
The term Molality was first found in a distribution that goes by the name "Thermodynamics and the Free Energies of Compound Substances", which was distributed in the year 1923 by G N Lewis and M Randall. It is represented by 'm'.
Molarity is the computation of the quantity of solutes that are available in a liter of an answer. As we have referenced before, an answer contains both the solute and the dissolvable. Though, Molality is the estimation of the quantity of solutes that are available in a kilogram of the dissolvable itself. As we definitely know, a dissolvable is something that breaks down the solute.
Now, we are given concentration of aqueous solution is 15ppb,which means in 1 billion number of moles of lead ions are 15
∵In 1 billion ml number of moles of lead ions are =15
∴In 1000 ml number of moles of lead ions are =(15×1000) / 10¹⁰
=>In 1000 ml number of moles of lead ions are=15ˣ10⁻⁷
Hence, molarity of aqueous solution is 15ˣ10⁻⁷M.
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A(n) _____ is the smallest particle of an element that retains its identity in a chemical reaction.
Answer:
atom
Explanation:
This describes an ATOM
What are the properties of sodium bicarbonate?
Some of the properties of sodium bicarbonate are it is a white crystalline powder which can sometimes forms lumps. It is odorless and has a bitter, salty taste. At room temperature sodium bicarbonate it is a solid.
It is soluble in water and can be removed from water by the chemical process known as evaporation.
Some applications of this compound is in the baking, cleaning and deodorizing industries.
They are alkaline in nature and releases gas such as CO2 when involved in an acid - base reaction.
Sodium bicarbonate decomposes, or gets separated to form carbon dioxide (CO2) and water (H2O) with small amounts of sodium carbonate (NaCO3).
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Classify each molecular art as an element or a compound. Element Compound
The balls with same color are considered to be atoms of same elements. Then, A, C, D, E are compounds and B and F are molecules.
What are compounds?Compounds are combinations of atoms of different elements. Atoms combine together through a type of bonding such as ionic bond, covalent bond, hydrogen bond etc.
Molecules are formed by atoms of same elements. They are called as molecules of an element. For example H₂, O₂, N₃ etc are molecules. H₂O, CO₂,etc are compounds.
The balls with the same colors are atoms of same element. The model with balls of different colors are compounds. Hence, A, C, D and E are compounds and B and F are molecules.
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Is oxygen the deadliest gas?
Answer: Nitrogen is the deadliest gas
Explanation:
It is the most prevalent gas in the atmosphere. Nitrogen comprises more than 75% of the air we breathe. Therefore, N2 is the most lethal of all destructive, dangerous, and toxic gases. Since it is the gas that we breathe in the most, it is found abundantly in the atmosphere.
The molecular geometry (shape) of the PF4+ ion IS tetrahedral trigonal planar trigonal bipyramidal octahedral trigonal pyramidal Using VSEPR Theory, the predicted Cl-B-Cl bond angle for BCI3 is 180° 107° 120° 109.5° 900 Using VSEPR Theory the molecular geometry (shape) for SF4 is square planar trigonal bipyramidal T-shaped octahedral see-saw
According to the modern VSEPR theory, the shape of [tex]PF^{+}_4[/tex] is Tetrahedral. The predicted Cl - B - Cl bond angle forming [tex]BCl_{3}[/tex] is 120°. The molecular geometry (shape) of [tex]SF_{4}[/tex] is See-saw.
According to the modern VSEPR theory, we can calculate geometry(shape) by calculating the valence electrons.
number of electron - shape
6 - Trigonal
8 - Tetrahedral
10 - Trigonal bipyramidal (TBP)
12 - Octahedral
a. [tex]PF^{+}_4[/tex]
Here, the total valence electrons = 5 + 4 - 1 = 8.
valence electrons of P = 5
Valence electrons of F = 1.
hence, we get the total F = 4.
So, the number of valence electrons is 8. So the shape is Tetrahedral.
b. [tex]BCl_{3}[/tex]
Here, the total valence electrons = 3 + 3 = 6.
this means that the shape is trigonal planar.
So, the predicted Cl - B - Cl bond angle forming [tex]BCl_{3}[/tex] is 120°.
c. [tex]SF_{4}[/tex]
Here, the total valence electrons = 6 + 4 = 10.
valence electrons of P = 6
Valence electrons of 4 F = 4.
So, the number of valence electrons is 10. So the shape is Trigonal Bipyramidal (TBP).
Geometry is TBP according to VSEPR but the shape is see-saw according to Bents rule.
Check out the molecular geometry (shape) given below.
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there are four branched isomers of hexane. draw bond-line structures of all four of its isomers.
There are chain isomer of hexane, which include both branched and straight chain.
Compounds with the same molecular formula but a distinct structural formula are known as isomers. The structural isomers are those that differ in the atomic arrangement of the molecules without any consideration of the spatial arrangement. Structural isomerism is the term for this phenomena of these structural isomers. A hydrocarbon compound with the chemical formula of hexane. Five distinct isomer types of hexane are possible.
A five-carbon chain with one methyl branch on the second is called 2-Methylpentane (Isohexane). A five-carbon chain with one methyl branch on the third is called 3-methylpentane. Four-carbon chain with one methyl branch on the second and third is known as 2,3-dimethylbutane. Neohexane, a four-carbon chain with two methyl branching on the second, is 2,2-dimethylbutane.
Hence, isomer have different spatial arrangement and same chemical formula.
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The two solids are similar and the ratio between the lengths of their edges is 2 7.
The ratio of the surface areas of The two solids are similar and the ratio between the lengths of their edges is 2:7 is 4:49
The ratio of the surface area can be calculates as follows:
The fact that
The scale factor is the ratio between the equivalent sides of two figures that are similar to one another.
The scale factor in this question is equal to the ratio 2
7
and
Acknowledge this
When two solid are similar, their surface area ratios are equal to the square of the scale factor.
therefore,
The ratio of their surface areas in this question is (2/7)² = 4/49
Your question is incomplete but most probably your full question was
The two solids are similar and the ratio between the lengths of their edges is 2:7 what is the ratio of their surface areas?
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