The type of pollutant in waterways which can be toxic at high levels is nitrates.
What is pollutant?Pollutant is a substance that is introduced into the environment and has negative effects on living organisms and the environment. It can be either natural or man-made and can include air pollutants such as carbon dioxide, sulfur dioxide, nitrogen oxides, and particulate matter, as well as water pollutants such as nutrients, heavy metals, and toxic chemicals.
Nitrates are nitrogen-containing compounds and are often found in fertilizers, wastewater and agricultural runoff. Nitrates can lead to oxygen depletion in water and can be harmful to aquatic life and humans if consumed in high amounts. The River Avon in Warwickshire is known to have high levels of nitrates due to agricultural runoff.
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Sodium chloride and calcium carbonate have been mixed together. Sodium chloride i oluble in water but calcium carbonate i not. Which decription give the correct tep in the eparation of thee two olid
As sodium chloride is soluble in water, it will dissolve in water and being insoluble calcium carbonate will make precipitate, which can be separated easily.
To separate calcium carbonate and sodium chloride follow the steps given below:-
firstly water should be added to the mixture of sodium chloride and calcium carbonate.stir water into the mixture and dissolve the NaCl.Then pour off the solution and evaporate it to recover the separated NaCl.Calcium carbonate is not soluble in water but sodium chloride is.Remove the calcium carbonate.we should repeat the process several times to obtain proper results.This is how sodium chloride and calcium carbonate can be separated.Go through the given link below to know more about NaCl:-
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Each of the given reactions is catalyzed by an enzyme. For each reaction, classify the enzyme according to one of the six categories suggested by the International Union of Biochemistry. Consider the reaction. H 2 O + A dipeptide and water forms two amino acids. Which category does the catalyzing enzyme belong to?
Considering the given reaction, H 2 O + A dipeptide and water forms two amino acids, hydrolase category does the catalyzing enzyme belongs.
The catalyzing enzyme in the reaction H2O + A dipeptide → two amino acids belongs to the Hydrolase category. This is because the enzyme catalyzes the hydrolysis of a dipeptide, which involves the addition of water (H2O) to the dipeptide to form two amino acids. Hydrolases are enzymes that catalyze the hydrolysis of various types of biological molecules, such as carbohydrates, lipids, and nucleic acids.
1. Esterases, which catalyze the hydrolysis of esters, breaking the bond between the carboxyl and alcohol groups.
2. Lipases, which catalyze the hydrolysis of lipids, breaking the bond between the glycerol and fatty acid groups.
3. Peptidases, which catalyze the hydrolysis of peptides, breaking the bond between the amino acids.
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what is the entropy of this collection of training examples with respect to the target function classification?
Deciding whether or not to approve a mortgage Future changes in consumer purchase tendencies can be predicted using classification models.
A mortgage is a kind of loan used to buy or keep up real estate, such as a home, piece of land, or other construction. The borrower agrees to make a series of monthly payments, divided into principal and interest, to the mortgage lender. This frequently emerges as a succession of regular, weekly episodes. After then, the asset is forfeited as loan collateral.
Borrowers are need to fill out an application with their selected lender and fulfill a number of criteria, such as down payments and minimum credit scores. Before going on to the closing stage, mortgage applications must pass a stringent underwriting procedure.
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identify tools that are ideal for cleaning glassware.
tools that are ideal for cleaning glassware Brushes and Detergent
Scrub the interior of curved glassware with warm tap water and a brush dipped in soapy water. You can flush the sink with this waste water. To avoid severe water stains, detergents, remove soap suds with deionized water. Pouring the DI water rinse through clean glassware should result in a smooth sheet. According to the University of Wisconsin Office of Chemical Safety, acid solutions such fuming sulfuric acid, diluted sulfuric acid, chromic acid solution, piranha solution, and aqua regia (a blend of nitric acid and hydrochloric acid) are used to clean laboratory glassware.
identify tools that are ideal for cleaning glassware.
1. reusable clothes
2.brushes
3. detergents
4. steel wool water
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an empty container with a volume of 160.0 cm3 is weighed and found to have a mass of 72.3 g. the container is filled with a liquid and reweighed. the mass of the container and the liquid is 199.9 g. what is the density of the liquid to the appropriate number of significant figures?
An empty container with a volume of 160.0 cm³ is weighed and found to have a mass of 72.3 g. The density of the liquid is 0.797 g/ cm³.
The Mass of empty container = 72.3 g
The Mass of container + Liquid = 199.9 g
The Mass of Liquid =?
The Mass of Liquid = (Mass of container + Liquid) – (Mass of the empty
container)
The Mass of Liquid = 199.9 - 72.3
The Mass of Liquid = 127.6 g
The volume = 160 cm³
The density is given as:
Density = mass / volume
Density = 127.6 / 160
Density = 0.797 g/cm³
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what is the process of splitting a uranium atom called?
Answer:
Nuclear fission
conclusions: how do the results for methane compare to those for butane? does your experimental data verify charles's law?
The rule of conservation of mass only holds when the combined masses of the reactants and products are equal. As a result, if we know the masses of one reactant and one product, we can calculate the masses of the other reactant and product.
We know that the reactants in this case have beginning concentrations of 25.0 g of lithium and 25.0 g of bromine. The molar mass of lithium is 6.939 g/mol, whereas the molar mass of bromine is 159.808 g/mol.
In order to convert the mass of any material into a unit of moles the temperature and volume of methane and butane must be measured and recorded at various pressures and temperatures in an experiment to confirm Charles's Law. The data from the experiment must then be analyzed to determine whether the relationship between temperature and volume is direct and linear, as predicted by Charles's Law.
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Introduction
Use your responses from the Project Summary to describe the project goal and criteria. Add one to two sentences to describe your optimal design.
*
5000 characters remaining
Design Decisions
Use your Proposal Outline and feedback from your project director to explain how your design addresses each criterion.
The specific aims that you want the project to achieve are known as project objectives.
What is Project goal?Every choice made throughout the project life cycle will be influenced by the project objectives, which is why it's so important to articulate them as clearly as possible at the outset.
Using the SMART methodology for creating project management objectives is one of the greatest ways to ensure that your project goals are clear and explicit.
PMs and their teams may plan projects effectively and guarantee on-time, on-budget delivery by using SMART project objectives.
Therefore, The specific aims that you want the project to achieve are known as project objectives.
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a fictitious element z has an average atomic mass of 223.13 u. element z has two naturally occuring isotopes. the more abundant isotope has an exact mass of 224.75 u and a relative abundance of 62.94%. calculate the exact mass of the second isotope.
The exact mass of the second isotope is 224.15 u
The following equation can be used to get the average atomic mass:
average atomic mass = (% of the first isotope/100) x mass of the first isotope+ (% of the second isotope/100) x mass of the second isotope)
Due to this:
Initially isotope:
% = 62.94 %
Mass = 224.75 u
The second isotope is:
Since there are only two isotopes of the element, the second percentage is equal to 100 minus the first percentage.
% = 100 % - 62.94 % = 37.06 %
Assume Mass = x u.
Average Mass = 223.13 u, as stated
Thus,
average atomic mass = (% of the first isotope/100) x mass of the first isotope+ (% of the second isotope/100) x mass of the second isotope)
223.13 = (62.94 % x 224.75) +( 37.06 % x 223.13 )
100 100
When we solve for x, we obtain:
x = 224.15 u
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In the compound, A is the ___, B is the ____, C is the ___.
Multiple choices:
-Hydrate
-Anhydrate
-Waters of hydration
The highlighted parts of the compound are;
A - Anhydrate
B - Waters of hydration
C - Hydrate
What is a hydrated compound?We know that a compound can be said to be hydrated if the compound does contain a water of crystallization. The implication of this is that If we have a compound that has a certain specified number of water molecules attached to it, we can say that the compound is hydrated.
The anhydrous compound is the compound that has lost its water of crystallization. We can tell that for the compound that we have, there is a water of hydration attached.
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in one trial, scientist find that a 200-g sample of chalk, CaCO3, contains 80g of calcium. in a second trial, the scientist find that a 100-g sample of chalk contains 40g of calcium. explain how the data demonstrate the law of definite proportions.
According to law of definite proportion, the ratio of elements in calcium carbonate is always fixed. Thus on mole of calcium carbonate is 100 g which contains one Ca atom weighs 40 g. Thus,200 g of CaCO₃ contains 80 g of Ca.
What is law of definite proportion ?Law of definite proportion states that, every compound will maintain a definite proportion of its constituent elements always irrespective of the source and method of preparation.
Therefore, all the elements in a compound will be in a fixed ratio with total mass of the compound. There is only one Ca in one formula unit of CaCO₃.
atomic mass of Ca = 40 g/mol
molar mass of CaCO₃ = 100 g/mol/
Hence, 100 g of CaCO₃ contains 40 g of Ca, if 200 g of CaCO₃ is taken, the mass of Ca doubles to 80 g to keep the definite proportion of the composition.
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hich of the following options correctly describe entropy? select all that apply. multiple select question. the symbol for entropy is e. entropy is a measure of the energy dispersal of a system. the greater the freedom of motion of particles in a system, the greater the entropy of the system. any process that causes an increase in the entropy of a system will be spontaneous. entropy is another term for kinetic energy or energy of movement.
The options which correctly describe entropy are- Entropy is a measure of the energy dispersal of a system, The greater the freedom of motion of particles in a system, the greater the entropy of the system and Any process that causes an increase in the entropy of a system will be spontaneous.
What is the definition of entropy?Entropy is a measure of the disorder or randomness of a system, and it is often associated with the amount of energy that is unavailable to do work. The symbol for entropy is S. It is not another term for kinetic energy or energy of movement.
What is the second law of thermodynamics?The second law of thermodynamics says that the total entropy of a system either increases or will remain constant in any spontaneous process. It never decreases.
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I need a description for the rocks mass-spectrum
Table C. Arrangement of Layers with Rock Intrusion and Description of Rocks
Basalt is an ingenious salt which is found near the surface. Limestone fossils are found in sedimentary sequences and they are old by 2.7 billion years. Sand stones with trilobites are old about 500 million years.
What are rock types?Rocks are the major parts of the tectonic plates of earth, There are broadly three classes of rocks namely, sedimentary rocks, igneous rocks and metamorphic rocks.
Basalt is a type of well grained igneous rocks found near the surface of earth. Rapid cooling of lava rich in Mg and Ca composes Basalt rock
Limestone, a form of carbonate sedimentary rock composed primarily of calcium carbonate (CaCO3). The minerals calcite and aragonite, which are various crystal forms of CaCO3, make up the majority of its material. When these minerals separate from water that has dissolved calcium, limestone is created.
Sileous sandstone is a typical component of nearshore deposits about 500-600 million years of age. This often grades into siltstone and shale as it moves into the sea, with finer-grained sediment accumulating in deeper water to create these rocks.
Shale rocks with ammonites have an age of about 70 million years. Ammonites are spiral shaped fossilized shells of marine animals.
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a certain hydrocarbon (a compound consisting of carbon and hydrogen) is carbon by mass and has a molar mass of . determine its molecular formula.
The molecular formula of the hydrocarbon having 82.76 % carbon and hydrogen is [tex]C_{4} H_{10}[/tex].
Hydrocarbon are defined as an organic compound consisting of hydrogen and carbon. These are the examples of group 14 hydrides. Hydrocarbons are colorless compounds and these are hydrophobic. The odors of hydrocarbons are weak.
Suppose we have 100 g of the given compound. if there are 82.76 g of carbon then it should have 17.24 g of hydrogen in it.
The molar mass of carbon is 12.01 g/mol.
The molar mass of hydrogen is 1.01 g/mol.
We have to calculate the number of moles.
Number of moles of carbon = 82.76 g / 12.01g/ mole
= 6.89 mole
Number of moles of Hydrogen = 17.24 g / 1.01g/ mole
= 17.07 mole
Now we have to divide the moles of carbon and hydrogen by the smallest value.
For carbon, 6.89 mole / 6.89 mole = 1
For Hydrogen, 17.07 mole / 6.89 mole = 2.5
Then the ratio becomes 2: 5. so the empirical formula is [tex]C_{2}H_{5}[/tex] having the weight of 29.07 g / mole.
n = molecular mass / weight of empirical
= 58.1 g/ mole / 29.07 g / mole
= 2
so the molecular formula becomes 2 * [tex]C_{2} H_{5}[/tex] = [tex]C_{4} H_{10}[/tex] .
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The complete question is,
What is the molecular formula for a compound that composed of 82.76% carbon having a molecular mass of 58.1 g/mole and is composed solely of carbon and hydrogen?
molecular formula is [tex]C{4H{10} }[/tex] for the hydrocarbon compound consisting of carbon and hydrogen.
An organic substance made up of hydrogen and carbon is referred to as a hydrocarbon. These group 14 hydride examples are shown. Hydrocarbons are invisible molecules that repel water. Hydrocarbons have hardly detectable smells. Consider that we have 100 g of the specified chemical. 17.24 g of hydrogen should be present if there are 82.76 g of carbon.
Carbon has a molar mass of 12.01 g/mol.
Hydrogen has a molar mass of 1.01 g/mol.
We must determine the amount of moles.
Number of moles of carbon = 82.76 g / 12.01g/ mol = 6.89 mole
Number of moles of Hydrogen = 17.24 g / 1.01g/ mol = 17.07 mole
The next step is to divide the moles of hydrogen and carbon by the least number. 6.89 mole / 6.89 mole equals one for carbon.
17.07 moles / 6.89 moles of hydrogen equal 2.5
Then, the ratio changes to 2 to 5. Therefore, the empirical formula weighs 29.07 g per mole.
n = empirical weight / molecular mass
29.07 g/mole / 58.1 g/mole = 2
Consequently, the molecular equation is 2 * [tex]C_{2} H_{5\\}[/tex] = [tex]C_{4} H_{10}[/tex]
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The complete question is,
What is the molecular formula for a compound that composed of 82.76% carbon having a molecular mass of 58.1 g/mole and is composed solely of carbon and hydrogen?
What is the formula for this ionic crystal ?
The chemical formula of the ionic crystal is Ca₄F₈ (option D).
What is an ionic crystal?Ionic crystal in chemistry is a crystalline form of an ionic compound.
According to this question, an ionic crystal is depicted in the attached image. The green balls represent fluoride ions while the blue balls represent calcium ions.
Based on the ionic crystal, there are four (4) calcium ions and eight (8) fluoride ions, hence, the formula of the ionic crystal is Ca₄F₈.
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How many moles are in .3 g of water
Answer:
n(H2O)=0.167mol
Explanation:
n(H2O)=m/M
m(H2O)=3g, M(H2O)=18g/mol
=>n(H2O)=3/18=o.167mol
what mass of precipitate forms when 22.0ml of 0.125mol sodium hydroxide reacts with 34.5ml of 0.110mol zinc sulfate
0.13 gram of precipitate forms when 22.0ml of 0.125mol sodium hydroxide reacts with 34.5ml of 0.110mol zinc sulfate.
What is molarity ?The term molarity is defined as the number solute dissolve in per litre of solution.
The balanced chemical equation that describes this double replacement reaction is as follows:
2NaOH + ZnSO₄ ⇒ Zn(OH)₂ + Na₂(SO)₄
Notice that you need 2 moles of sodium hydroxide in order to react with
1 mole of zinc(II) sulfate and produce 1 mole of zinc(II) hydroxide.
Use the molarities and volumes of the two solutions to figure out how many moles of each reactant you are mixing together.
0.00275 moles of NaOH
0.00379 moles of zinc sulphate
0.00379 moles of zinc sulphate × 2 mole NaOH / 1 mole zinc sulphate
= 0.00759
0.00137 moles of zinc oxide × 99.42 / 1 mole zinc hydroxide
= 0.13 gram
Thus, 0.13 gram of precipitate forms when 22.0ml of 0.125mol sodium hydroxide reacts with 34.5ml of 0.110mol zinc sulfate.
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polyatomic ion examples with explanation
A polyatomic ion examples with explanation are:
Carbonate (CO₃²⁻): This ion is made up of one carbon atom, three oxygen atoms, and a negative 2 charge. It is commonly found in rocks such as limestone and can also be found in baking soda.Nitrate (NO₃⁻): This ion is made up of one nitrogen atom and three oxygen atoms and it carries a negative 1 charge. It is commonly found in fertilizers and is also a component of nitric acid.What are polyatomic ion?A polyatomic ion is a group of atoms that are chemically bonded together and carry an overall electric charge. Here are a few examples of polyatomic ions:
Sulfate (SO₄²⁻): This ion is made up of one sulfur atom and four oxygen atoms, and it carries a negative 2 charge. It is commonly found in minerals such as gypsum and also in sulfate salts like Epsom salt.Lastly, Hydroxide (OH⁻): This ion is made up of one oxygen atom and one hydrogen atom and it carries a negative 1 charge. It is commonly found in water and it is the basis of many acids and bases.
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If zinc replaces iron, iron replaces lead, and zinc replaces lead in a chemical reactions, the order of activity from most active to least active is
In the given scenario, the order of activity from most active to least active is zinc, iron and lead.
The activity of an element in a chemical reaction is determined by its ability to participate in the formation of a compound. In this case, zinc is replacing both iron and lead, meaning it is more active than both of those elements and considered to be the most active element. Iron is only replacing lead, making it less active than zinc but more active than lead.
Lead is the only element that is being replaced, making it the least active element among the three. This order of activity is based on the relative ability of these elements to participate in chemical reactions and form compounds.
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A skydiver fall at 10 m/s. If he falls for 15 seconds, how many meters did he fall?
To find out how many meters the skydiver fell, you can use the formula:
distance = speed x time
distance = 10 m/s x 15 seconds
distance = 150 meters
Therefore, the skydiver fell 150 meters during his 15-second fall.
What is speed?Speed is a scalar quantity that describes how fast an object is moving. It is typically measured in units of distance per time, such as meters per second (m/s) or kilometers per hour (km/h).
Speed is different from velocity, which is also a measure of an object's movement, but velocity is a vector quantity and it describes an object's speed in a certain direction. Speed is the magnitude of velocity and it's a scalar quantity which only describes how fast an object is moving without considering direction. The formula for speed is distance traveled divided by the time it takes to travel that distance.
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How much change in temperature would the addition of 39,231J of heat have on a 532g sample of copper?
which is the most abundant chemical found in all living systems?
A. Protein
B. Water
C. Sugar
D. Nucleic acid
B. Water. Water is the most abundant chemical in the living organisms.Water is essential to all living things because it is involved in many chemical processes .
that occur within their cells and bodies. The universal solvent, water, functions as a medium for the chemical processes to take place. Additionally, substances that have been dissolved are transferred throughout the body from one area to another. Water is present in great quantity in living things. It is the only polar molecule found in living things that can passively diffuse through a cell membrane. It serves as one among the building blocks for photosynthesis and is essential for several metabolic processes. The most prevalent element found in living things, oxygen, makes up around 65% of the mass of the entire body. that have been dissolved are transferred throughout the body from one area to another.
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Which two changes would decrease the gravitational force between two objects?
Decreasing mass and increasing distance between two objects decrease the gravitational force between two objects.
What is gravitational force?The concept of gravitational force is described by Newton's Law of Universal Gravitation. This gravitational force is indeed a form of non-contact force; it is a constant attracting and constrictive force in nature.
The attraction force felt by two or even more objects into contact is known as gravitational force. The Gravitational Force Formula, which was derived from Newton's Universal Law of Gravitation, is used to calculate the gravitational force.
F=GmM/r²
From formula we can see that decreasing mass and increasing distance between two objects decrease the gravitational force between two objects.
Therefore, decreasing mass and increasing distance between two objects decrease the gravitational force between two objects.
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what volume of 6 m acetic acid is required to fully react with 0.5 g of sodium bicarbonate (nahco3)?
The volume of 6 M acetic acid required to fully react with 0.5 g of sodium bicarbonate is 0.099167 mL.
To determine the volume of 6 M acetic acid required to fully react with 0.5 g of sodium bicarbonate (NaHCO3), we need to use the balanced equation for the reaction between acetic acid and sodium bicarbonate.
The balanced equation is:
CH3COOH(aq) + NaHCO3(aq) → CH3COONa(aq) + H2O(l) + CO2(g)
From the balanced equation, we know that one mole of acetic acid reacts with one mole of sodium bicarbonate.
we know that the molarity is moles of solute per liters of solvent, so the number of moles in 0.5 g of sodium bicarbonate is 0.5/84 = 0.00595 mol
And since one mole of acetic acid reacts with one mole of sodium bicarbonate, we know that we need 0.00595 mole of acetic acid to fully react with 0.5 g of sodium bicarbonate.
If we know the molarity of acetic acid, we can calculate the volume of acetic acid required to react with 0.5 g of sodium bicarbonate. we have
V = n / M = 0.00595 / 6 = 0.00099167 L = 0.099167 mL
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Firocoxib (CHoOS) is s an anti-inflammatory medication used to treat pain and inflammation in dogs and horses. Dobby, a Yorkie, is given one half of a tablet each morning. Each tablet contains 125 milligrams of medication. You must show all calculations to
earn full credit.
• Calculate the molar mass of this medication.
• Calculate the number of moles of medication in one
tablet.
• How many moles of firocoxib does Dobby take each
day?
The molar mass of a compound is defined as the sum of the molar masses of the various elements that makes up the compound.
The molar mass of the medication, C₁₇H₂₀O₅S can be obtained as follow:
Molar mass of C = 12 g/molMolar mass of H = 1 g/molMolar mass of O = 16 g/molMolar mass of S = 32 g/molMolar mass of C₁₇H₂₀O₅S =?Molar mass of C₁₇H₂₀O₅S = (17 × 12) + (20 × 1) + (5 × 16) + 32
Molar mass of C₁₇H₂₀O₅S = 204 + 20 + 80 + 32
Molar mass of C₁₇H₂₀O₅S = 336 g/mol
2. How do I determine the number of mole?The number of mole of medication in one tablet can be obtained as follow:
Mass of one tablet = 125 mg = 25 / 1000 = 0.125 gMolar mass of C₁₇H₂₀O₅S = 336 g/molNumber of mole of one tablet =?Mole = mass / molar mass
Number of mole of one tablet = 0.125 / 336
Number of mole of one tablet = 0.000372 mole
3. How do I determine the number of mole?The number of mole of firocoxib that Dobby takes each day can be obtained as follow:
Tablets taken each day = 1½ tabletsMass of tablets each day tablet = 0.125 gMass of tablets taken each day = 0.125 + (0.125/2) = 0.1875 gMolar mass of C₁₇H₂₀O₅S = 336 g/molNumber of mole of tablets taken each day =?Mole = mass / molar mass
Number of mole of tablets taken each day = 0.1875 / 336
Number of mole of tablets taken each day = 0.000558 mole
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How many milligrams are in 5.7 grams
Answer:
5700 milligrams
Explanation:
To go to a smaller unit you move the decimal to the right.
a 140.0 g sample of water at 20.0 °c is mixed with 100.0 g of a certain metal at 95.0 °c. after thermal equilibrium was established, the temperature of the mixture is 24.6 °c. what is the specific heat capacity of the metal?
the specific heat capacity of the metal is 0.3427 J/g°C.
Water mass is 140.0 g.
Water started out at a temperature of 20.0 °C.
100 g is the mass of a specific metal.
Metal's initial temperature is 95.0°C.
Water and metal's combined final temperature is 24.6°C.
The water will gain heat because its initial temperature is lower than that of the metal, which will lose heat because it is at a greater initial temperature. Therefore, heat obtained by water equals heat lost by metal.
formula: (mass water)(finalT- initalT) = (mass metal)(initialT- finalT)(Cp metal) ( Cp water)
after entering the provided info we obtain,
(100g )(95°C -24.6°C)
(140.0g)(24.6°C–20.0°C) = (Cp metal) (4.184 J/g°C)
The formula is (100g)(70.4°C)(Cp metal)=(140.0g)(4.6°C)(4.184 J/g°C)
7863.7 g°C = 2694.5 J (Cp metal)
Cp metal = 2694.5% J/7863.7% g°C
Cp of metal therefore equals 0.3427 J/g°C.
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the rate constant for a reaction at 40.0oc is exactly three times that at 20.0oc. calculate the activation energy for the reaction. report your answer in kj/mol.
The activation energy for the reaction is 4.187 x 10⁴ J/mol.
The reaction's starting point temperature is 40.0° C
T' = 20.0° C is the reaction's final temperature.
Initial temperature's rate constant is three times higher than final temperature's.
The relationship between the Arrhenius energy and the rate constant is the basis of the presented problem. And the mathematical expression is as follows:
ln k'/k = (Eₐ/R) x (1/T-1/T')
The universal gas constant, R, is used here. And is the activation's Arrhenius energy.
As stated in the issue,
K'/k = 3
Solving as,
ln k'/k = (Eₐ/R) x (1/T-1/T')
ln 3 = (Eₐ/8.134) x (1/293-1/313)
1.098 = (Eₐ/8.134) x2.18 x10⁻⁴
Eₐ = 4.187x 10⁻⁴ J
Thus, it follows that the required amount of activation energy for the specified reaction is 4.187x 10⁻⁴ J.
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a student mixes 50.0 ml of 0.10 m pb(no3)2 solution with 50.0 ml of 0.10 m kcl. a white precipitate forms, and the concentration of the chloride ion becomes very small. which list places the concentrations of the remaining ions in order of decreasing concentration?
[ NO3-] > [K+] > [Pb2+] is correctly places the concentrations of the remaining ions in order of decreasing concentration.
As from the given data, we know that,
Pb(NO3)2 + 2KCl = PbCl2 + 2KNO3
we know,
Pb(NO3)2= 0.005mol
2KCL = 0.005mol
PbCl2 = 0.0025mol
2KNO3 = 0.005mol
SO,
K+ and NO3- spectators 2NO3- for each K+
Pb and K+ are equal but some Pb precipitate
Hence, giving the concentration order as,
[ NO3-] > [K+] > [Pb2+] and the concentration of the chloride ion becomes very small and hence it is negligible.
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the density of gold is 19.3 g/ml. what is the volume of a gold nugget that weighs 67.0 g? write your numerical answer without unit inside the box. the answer should be in three significant figures and in standard not scientific notation.
The volume of a gold nugget that weighs 67.0 g is 3.47 mL
The relationship between an object's mass and the volume it occupies is known as its density. This means that if an object's volume increases but its mass remains constant, its density will decrease.
We use the equation: to determine the mass of the solution.
ρ = m/V
whre,
ρ = density
m= mass
v= volume
so,
V= m/ρ
We receive:
Gold mass =67.0 grams.
Gold has a density of 19.3 g/mL.
Using the values in the equation above, we obtain:
V= m/ρ
V = 67.0 grams./ 19.3 g/mL.
V= 3.47 mL
Consequently, the gold nugget's volume is 3.47 mL
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