Bronze is an alloy made of copper (cu) and tin (sn). calculate the mass of a bronze cylinder of radius 3.77 cm and length 35.38 cm. the composition of the bronze is 79.42 percent cu and 20.58 percent sn and the densities of cu and sn are 8.94 g/cm3 and 7.31 g/cm3, respectively. what assumption should you make in this calculation? enter your answer in scientific notation.
Final answer:
To find the mass of a bronze cylinder, calculate its volume using its dimensions, then compute the weighted average density based on the proportions of copper and tin, and finally multiply the volume by this average density. Convert to scientific notation as the last step.
Explanation:
To calculate the mass of the bronze cylinder, we must first determine its volume using the formula for the volume of a cylinder, V = πr^2h, where π is Pi, r is the radius, and h is the height or length of the cylinder. Then, we can use the composition percentages of copper (Cu) and tin (Sn) along with their densities to calculate the mass.
First, we must assume that the alloy is uniformly mixed such that the ratio of the densities corresponds exactly to the percentage composition provided. Now, let's calculate the volume:
Radius (r) = 3.77 cm
Length (h) = 35.38 cm
Volume (V) = π * (3.77 cm)^2 * 35.38 cm
Next, we calculate the contribution of each metal's mass to the total mass of the cylinder:
Density of Cu = 8.94 g/cm^3
Density of Sn = 7.31 g/cm^3
Percentage of Cu = 79.42%
Percentage of Sn = 20.58%
To find the total mass (m), we multiply the volume (V) by the weighted average density (ρ_avg), which factors in the percentages of Cu and Sn:
ρ_avg = (0.7942 * 8.94 g/cm^3) + (0.2058 * 7.31 g/cm^3)
Mass (m) = Volume (V) * ρ_avg
Lastly, the mass can be converted to scientific notation as required.
How calculate how many milliliters of glycerin (specific gravity=1.26) will have a mass of 0.75 lbs?
To calculate the volume in milliliters of glycerin with a mass of 0.75 lbs, first convert the mass to kilograms, then use the specific gravity of glycerin (1.26) to find its density and divide the mass by this density to get the volume, which is then converted from cubic meters to milliliters.
To calculate the volume of glycerin in milliliters with a mass of 0.75 lbs, we need to use the specific gravity and the relationship between mass, density, and volume. The specific gravity of glycerin is given as 1.26, which means glycerin is 1.26 times denser than water at the same temperature and pressure. The density of water is approximately 1 g/cm³ or 1000 kg/m³.
To find the density of glycerin, we multiply the specific gravity by the density of water: density of glycerin = 1.26 x 1000 kg/m³ = 1260 kg/m³.
Next, we need to convert 0.75 pounds to kilograms, knowing that 1 pound is equivalent to 0.453592 kilograms. Therefore, the mass of glycerin is 0.75 lbs x 0.453592 kg/lbs = 0.340194 kg.
To find the volume in cubic meters, we divide the mass by the density: volume of glycerin = 0.340194 kg / 1260 kg/m³ = 0.00027015 m³.
Finally, to convert cubic meters to milliliters, we use the conversion factor that 1 m³ is equal to 1,000,000 milliliters, resulting in a volume of glycerin of about: 0.00027015 m³ x 1,000,000 mL/m³ = 270.15 mL of glycerin.
a patient is to receive 25 mg of methimazole, a drug used to treat hyperthyroid conditions. the drug is dissolved in solution containing 6.0 mg/mL
The volume of methimazole solution required to deliver a 25 mg dose of the drug, given a concentration of 6.0 mg/mL, is a little over 4 mL.
Explanation:The patient needs to receive 25 mg of methimazole that is available at a concentration of 6.0 mg/mL. To calculate the volume, we'll use the simple formula: volume = desired dose / concentration. Therefore, the volume = 25 mg / 6.0 mg/mL, which results in a little more than 4 mL, which is the amount of methimazole solution needed for the patient's dose.
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Which is made by weathering?
A.Sediments
B.Ash
C.Minerals
D.Magma
"The correct answer is A. Sediments.
Weathering is the process by which rocks are broken down into smaller particles and altered chemically by the action of water, wind, and temperature changes. This process occurs in situ, meaning it happens where the rock is located, without any transport of the material. The products of weathering include soil, ions in solution, and small particles known as sediments. These sediments can be transported by agents such as water, wind, ice, or gravity to other locations where they may eventually form sedimentary rocks.
Let's consider the other options:
B. Ash - Ash is typically the product of volcanic eruptions and is composed of fragmented rock and glass particles that are ejected into the atmosphere during an eruption. It is not formed by weathering.
C. Minerals - Minerals are naturally occurring inorganic solids with a definite chemical composition and crystal structure. They are the building blocks of rocks and can be altered by weathering, but they are not created by the weathering process itself.
D. Magma - Magma is molten rock that is found beneath the Earth's surface. It can contain crystals, dissolved gases, and sometimes even bits of solid rock. Magma is formed by the melting of existing rock within the Earth's mantle or crust, not by weathering.
Therefore, the most accurate answer to the question of which is made by weathering is A. Sediments."
What is the theoretical yield of Na2SO4, in grams?
A silver necklace is made from a pure sample of silver that is free of I'm purities. Which term or terms could be used to describe this sample of silver ?
Conditions for an experimental chemistry reaction require a temperature of 300 K. The temperature in the lab is 55 F. Which of the following must you do to meet the requirements?
Answer:
decrease the room temperature by 26°F
F=95(K−273)+32 .
Select the ions below which possess the electron configuration of a noble gas.
The correct options are A and B.
The correct ions with noble gas electron configurations are A. [tex]$\mathrm{H}^{-}$[/tex] and B. [tex]$\mathrm{Na}^{+}$[/tex].
The electron configuration of a noble gas is characterized by a completely filled electron shell. Noble gases have electron configurations that end in s²p⁶, where 's' and 'p' represent the electron orbitals. Let's analyze the ions in question:
A. [tex]$\mathrm{H}^{-}$[/tex]: Hydrogen normally has 1 electron in its 1s orbital. However, [tex]$\mathrm{H}^{-}$[/tex] has gained an extra electron, making its electron configuration 1s², which is similar to helium, a noble gas.
B. [tex]$\mathrm{Na}^{+}$[/tex]: Sodium has an electron configuration of [Ne] 3s¹, but [tex]$\mathrm{Na}^{+}$[/tex] loses its 3s¹ electron to become [Ne], which is like a noble gas configuration.
C. [tex]$\mathrm{Br}^{+}$[/tex]: Bromine normally has an electron configuration of [Ar] 3d¹⁰ 4s² 4p⁵. When it loses an electron to form [tex]$\mathrm{Br}^{+}$[/tex], it becomes [Ar] 3d¹⁰ 4s² 4p⁴, which is not a noble gas configuration.
D. [tex]$\mathrm{F}^{+}$[/tex]: Fluorine normally has an electron configuration of [He] 2s² 2p⁵. When it loses an electron to form [tex]$\mathrm{F}^{+}$[/tex], it becomes [He] 2s² 2p⁴, which is not a noble gas configuration.
So, the ions that possess the electron configuration of a noble gas are A. [tex]$\mathrm{H}^{-}$[/tex] and B. [tex]$\mathrm{Na}^{+}$[/tex].
The complete question is here:
Select the ions below which possess the electron configuration of a noble gas.
A. [tex]$\mathrm{H}^{-}$[/tex]
B. [tex]$\mathrm{Na}^{+}$[/tex]
C. [tex]$\mathrm{Br}^{+}$[/tex]
D. [tex]$\mathrm{F}^{+}$[/tex]
The ions Cl-, O2-, H-, and Na+ all have the electron configuration of a noble gas: Cl- matches Argon, O2- matches Neon, H- matches Helium, and Na+ matches Neon.
The question is asking us to identify which ions have the electron configuration of a noble gas. In the periodic table, noble gases have a full outer shell of electrons, typically reaching the stable octet configuration. Let's examine the ions given:
Cl− has an atomic number of 17. In its neutral state, chlorine has the configuration [Ne]3s23p5. Gaining one electron to form Cl− would fill its 3p orbital, achieving the noble gas configuration of [Ar].O2− has an atomic number of 8. In its neutral state, oxygen has the configuration [He]2s22p4. Gaining two electrons to form O2− would fill its 2p orbital, achieving the noble gas configuration of [Ne].H− has an atomic number of 1. In its neutral state, hydrogen has one electron. Gaining one electron to form H− gives it the noble gas configuration of [He].Na+ has an atomic number of 11. In its neutral state, sodium has the configuration [Ne]3s1. Losing one electron to form Na+ would leave it with the noble gas configuration of [Ne].All of these ions indeed match the noble gas configurations; Cl− matches Argon, O2− matches Neon, H− matches Helium, and Na+ matches Neon.
Complete Question: Select the ions below which possess the electron configuration of a noble gas.
Cl−
O2−
H −
Na +
What can affect the properties of a substance
Answer:
the arrangement and types of atoms
Explanation:
A mixture was found to contain 3.50 g of sugar, 4.80 g of NaCl, and 7.20 g of sand. What is the percentage of sand?
First get the sum of the mass of each substance.
total mass = 3.50 g + 4.80 g + 7.20 g
total mass = 15.50 g
The percentage mass would be:
% mass = (7.20 g / 15.50 g) * 100%
% mass = 46.45%
A 0.100-g sample of your favorite candy is burned in a calorimeter that contains 1.00 kg of water initially at 21.0 ∘C. After the candy is burned, the water temperature is 34.5 ∘C. How many Calories are there per gram of your candy?
When the candy is burned, the heat transferred to the water is 13500 small calories. Consequently, there are 135 dietary Calories (Cal) per gram of the candy, calculated from the temperature change and the mass of the water and candy.
Explanation:To calculate the number of Calories per gram of candy based on a calorimetry experiment, we use the concept of specific heat capacity. The specific heat capacity of water is typically 4.184 J/g°C (or 1 cal/g°C). Given that 1,000 small calories are equivalent to one large calorie (also known as the dietary Calorie), we can determine the amount of heat transferred to the water in Calories and then divide by the mass of the candy.
We'll apply the formula: Heat (q) = mass (m) × specific heat capacity (c) × temperature change (ΔT), then convert joules to Calories and determine the Calories per gram of candy.
Let's calculate: mass of water = 1.00 kg = 1000 g, specific heat capacity of water = 1 cal/g°C, initial temperature = 21.0 °C, final temperature = 34.5 °C. Heat (q) = (1000 g) × (1 cal/g°C) × (34.5 °C - 21.0 °C) = 1000 g × 1 cal/g°C × 13.5 °C = 13500 cal. This is the heat absorbed by the water, which is the heat released by burning the candy. To find the Calories per gram of candy, we then divide this value by the mass of the candy: Calories/g = 13500 cal / 0.100 g = 135000 cal/g = 135 Cal/g.
Calculate the number of cells in a hummingbird assuming it weighs 10-2 kg
A hummingbird weighing 10^-2 kg contains approximately one trillion cells, assuming the average cell is ten times the mass of a bacterium. For a human weighing 70 kg with the same assumption, it would contain around 7 quadrillion cells.
Explanation:To calculate the number of cells in a hummingbird assuming it weighs 10-2 kg and considering the mass of an average cell is ten times the mass of a bacterium, we first need to establish the average mass of a bacterium. From the reference information given, we understand that the mass of a bacterium is on the order of 10-15 kg. Therefore, the average cell mass would be 10 times this, which is 10-14 kg.
Next, we divide the total mass of the hummingbird by the mass of one of its cells to determine the number of cells:
Number of cells = Mass of hummingbird / Mass of one cell
Number of cells = 10-2 kg / 10-14 kg
Number of cells = 1012
Therefore, a hummingbird that weighs 10-2 kg contains approximately one trillion (1012) cells.
To address part (b) of the question, assuming a human weighs about 70 kg and also assuming the mass of a human cell is ten times the mass of a bacterium (10-14 kg), we can perform a similar calculation:
Number of cells in a human = Mass of human / Mass of one cell
Number of cells in a human = 70 kg / 10-14 kg
Number of cells in a human = 7 x 1015
This suggests that a human has around 7 quadrillion (7 x 1015) cells.
Classify these compounds as strong electrolytes weak electrolytes or nonelectrolytes. fecl2 hf
FeCl2, or iron(II) chloride, is a strong electrolyte, while HF, or hydrofluoric acid, is a weak electrolyte.
Explanation:To classify the compounds FeCl2 and HF as strong electrolytes, weak electrolytes, or nonelectrolytes, we first need to understand what these terms mean. An electrolyte is a substance that produces an electrically conducting solution when dissolved in water based on its ability to dissociate into ions.
FeCl2, or iron(II) chloride, is a strong electrolyte. In solution, FeCl2 completely dissociates into iron(II) cations (Fe2+) and chloride anions (Cl-) sustaining an electric current.
HF, or hydrofluoric acid, is a weak electrolyte. This is because it partially dissociates into H+ ions and F- ions in solution, thus conducting electricity less than strong electrolytes.
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FeCl2 is a strong electrolyte because it dissociates completely in water, and HF is a weak electrolyte as it only partially dissociates in water.
Explanation:The classification of compounds as electrolytes or nonelectrolytes is based on their ability to conduct electricity when dissolved in water. This depends on whether they dissociate into ions in solution. For the compounds FeCl2 and HF:
FeCl2 (Iron II Chloride): This compound is ionic and when it dissolves in water, it dissociates completely into its constituent ions, Fe2+ and Cl-. This characteristic makes it a strong electrolyte.HF (Hydrofluoric Acid): While HF is an acid, it is a weak one. This means it dissociates only partially in water to form H+ and F- ions, so it is a weak electrolyte.Learn more about Electrolytes here:https://brainly.com/question/32888859
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The average density of human blood is 1.06 g/mL. What is the mass of blood in an adult with a blood volume of 5.5L? Express your answer in (a) grams & (b) ounces.
Answer : The mass of human blood in grams and ounce are 5830 grams and 205.647 ounce.
Explanation :
Density : It is defined as the mass contained per unit volume.
Formula used for density :
[tex]Density=\frac{Mass}{Volume}[/tex]
Given :
Density of human blood = 1.06 g/mL
Volume of human blood = 5.5 L = 5500 mL
conversion used : 1 L = 1000 mL
Now put all the given values in the above formula, we get the mass of human blood.
[tex]1.06g/mL=\frac{Mass}{5500mL}[/tex]
[tex]Mass=5830g[/tex]
The mass of human blood in grams = 5830 grams
Conversion used :
[tex]1\text{ ounce}=28.3495g\\\\1g=\frac{1}{28.3495}\text{ ounce}[/tex]
As, [tex]1g=\frac{1}{28.3495}\text{ ounce}[/tex]
So, [tex]5830g=\frac{5830g}{1g}\times \frac{1}{28.3495}\text{ ounce}=205.647\text{ ounce}[/tex]
Therefore, the mass of human blood in grams and ounce are 5830 grams and 205.647 ounce.
An organic solid has a vapor pressure of 900 torr at its melting point explain how you would purify this compound
Approximately 1.0g of caffeine will dissolve in 28ml of methylene chloride and in 46ml of water. calculate the distribution coefficient of caffeine in this solvent system.
The distribution coefficient of caffeine in this solvent system is approximately 0.579.
Explanation:The distribution coefficient of caffeine in this solvent system can be calculated using the formula:
Distribution Coefficient = Mass of Caffeine in Methylene Chloride / Mass of Caffeine in Water
From the given information, we know that approximately 1.0g of caffeine dissolves in 28ml of methylene chloride and in 46ml of water. Therefore, the distribution coefficient can be calculated as:
Distribution Coefficient = 1.0g / 28ml / (1.0g / 46ml) ≈ 0.579
Write a structural formula for 1-pentanol, the alcohol derived from pentane, by making a substitution on one of the carbon atoms.
Final answer:
The structural formula for 1-pentanol, an alcohol derived from pentane, is CH3(CH2)3CH2OH, with the OH group attached to the first carbon atom of the pentane chain.
Explanation:
To write the structural formula for 1-pentanol, start by considering the structure of pentane, C5H12. Since 1-pentanol is an alcohol derived by making a substitution on one of the carbon atoms of pentane, you replace a hydrogen on the first carbon with an OH (hydroxyl group). This yields the structural formula for 1-pentanol, which is CH3(CH2)3CH2OH, with the OH group attached to the first (terminal) carbon. 1-Pentanol is an alcohol with its hydroxyl group attached to the end carbon atom in the five-carbon chain. Therefore, the molecule is named as such, and the number 1 in 1-pentanol shows that the hydroxyl group is on the first carbon. The molecular ion mass (M+1) is 102, and this molecule would be a substituted alkane if additional substituents like chlorine were added.
Identify the oxidizing agent and the reducing agent for mg(s)+fe2+(aq)→mg2+(aq)+fe(s). express your answers as chemical formulas separated by a comma.
The Mg element is the reducing agent and the Fe element is the oxidizing agent
Further explanationThe oxidation-reduction reaction or abbreviated as Redox is a chemical reaction in which there is a change in oxidation number
3 basic theories explain this Redox concept:
1. Binding/release of oxygenThe oxidation reaction is the binding of a substance with oxygen. (O₂)
For example:
2SO₂ + O₂ ----> 2SO₃
The reduction reaction is the release of oxygen from a substance.
For example:
2CuO → 2Cu + O₂
2. Electron release / binding reactionOxidation is an electron release event
Example:
2F ---> 2Fe³⁺ + 6e⁻
The reduction is an electron capture event
Example:
3O₂ + 6e⁻ ---> 3O²⁻
3. The reaction of addition/reduction of oxidation numberOxidation is an increase/increase in oxidation number, while reduction is a decrease in oxidation number.
In the redox reaction, it is also known
Reducing agents are substances that experience oxidation
The oxidizing agent is a substance that is reduced
The formula for determining Oxidation Numbers in general:
1. Single element atomic oxidation number = 0. Examples of Ar, Mg, Cu, Fe, N₂, O₂, etc. = 0
Group IA (Li, Na, K, Rb, Cs, and Fr): +1
Group IIA (Be, Mg, Ca, Sr and Ba): +2
H in compound = +1, except metal hydride compounds (Hydrogen which binds to IA or IIA groups) oxidation number H= -1, for example, LiH, MgH₂, etc.
2. Oxidation number O in compound = -2, except OF2 = + 2 and in peroxide (Na₂O₂, BaO₂) = -1 and superoxide, for example KO₂ = -1/2.
3 The oxidation number in an uncharged compound = 0,
Total oxidation number in ion = ion charge, Example NO₃⁻ = -1
Redox reactions are reactions that are accompanied by changes in oxidation numbers, so what must be examined is whether there are elements that experience changes in oxidation numbers in the reaction
Let's look at the reaction
Mg(s)+Fe²⁺(aq)→Mg²⁺(aq)+Fe(s)
Let see the change in the oxidation number of each element
Mg on the left = 0 (single element)
Fe²⁺ on the left = +2 ( ion charge)
Mg on the right = +2 ( ion charge)
Fe on the right = 0 (single element)
Means that the element Mg has increased oxidation number from 0 to +2 so that it experiences an oxidation reaction and acts as a reducing agent
While Fe has decreased the oxidation number from +2 to 0, so it has a reduction reaction and acts as an oxidizer
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Keywords: oxidation-reduction, an oxidizing agent, a reducing agent
Aqueous solutions of barium nitrate and potassium phosphate are mixed. What is the precipitate and how many molecules are formed?
Answer: The precipitate is [tex]Ba_3(PO_4)_2[/tex] and 1 molecule of Barium phosphate and 6 molecules of Potassium nitrate is formed.
Explanation: We are given Barium nitrate and Potassium phosphate , that will lead to the formation of Barium phosphate and Potassium nitrate.
As we know that these solutions are present in water, therefore we will obtain Barium phosphate as a precipitate because Barium phosphate is insoluble in water and Potassium nitrate is soluble in water. Thus the reaction is
[tex]Ba(NO_3)_2(aq.)+K_3PO_4(aq.)\rightarrow Ba_3(PO_4)_2(ppt.)+KNO_3(aq.)[/tex]
To know how many molecules are formed at the end, we need to balance the above equation.
Balancing the equation, we get:
[tex]3Ba(NO_3)_2(aq.)+2K_3PO_4(aq.)\rightarrow Ba_3(PO_4)_2(ppt.)+6KNO_3(aq.)[/tex]
Thus, we get 1 molecule of Barium phosphate as a precipitate and 6 molecules of Potassium nitrate which is easily soluble in water.
Answer:
The barium phosphate is precipitate and 1 molecule is formed.
According to the reaction mentioned,
[tex]\rm \bold { 3BaNO_3_(_a_q_)+ 2K_3PO_4_(_a_q_) \rightarrow Ba_3(PO_4)_2_(_p_p_t_)+ 6 KNO_3_(_a_q_)}[/tex]
We can conclude that, the barium phosphate is precipitate and 1 molecule is formed.
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A colored solution gives the maximum absorbance value in the spectrophotometer at the wavelength of 533 nm. what are the absorbed and perceived colors of this solution?
Select all the items that are related to compounds. 1.chemical bonding 2.physical change 3.maintain original physical properties 4.new physical properties 5.mixture of 2 or more elements
The correct answer is option 3 and 5.
Compounds are made up of a mixture of 2 or more elements such as H₂O or NaCl.
Compounds have physical properties that are constant and hence allow us to identify them. Different physical properties include color, solubility, mass, odor, density, boiling point, melting point etc
Answer:
The correct answers are, "Maintain Original Physical Properties", "Mixture of 2 or More Elements", and "Physical Change"
Explanation:
21 g each of Li (molar mass = 7 g/mol) and N2 (molar mass = 28 g/mol) are placed in a reaction vessel. What is the maximum mass of Li3N (molar mass = 35) that can be produced?
Given 21 grams each of Lithium (Li) and Nitrogen (N2), the maximum mass of Lithium Nitride (Li3N) that can be produced is 52.5 grams.
Explanation:The chemical reaction between Lithium (Li) and Nitrogen (N2) can be represented as:
6Li + N2 → 2Li3N
From this balanced chemical equation, it is clear that 6 moles of Li react with 1 mole of N2 to produce 2 moles of Li3N. Given that the molar mass of Li is 7 g/mol and that of N2 is 28 g/mol, if we have 21 g each of Li (3 moles) and N2 (0.75 moles), the limiting reactant is N2 because we have fewer moles of N2 compared to Li according to the stoichiometry of the reaction.
Because N2 is our limiting reactant, we can only produce a stoichiometrically equivalent amount of Li3N based on the moles of N2. Thus, for every mole of N2, we produce 2 moles of Li3N. Therefore, if we have 0.75 moles of N2, we could produce 1.5 moles of Li3N. Given that the molar mass of Li3N is 35 g/mol, the maximum mass of Li3N that can be produced is 52.5 g.
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A 257-ml sample of a sugar solution containing 1.10 g of the sugar has an osmotic pressure of 31.5 mm hg at 39°c. what is the molar mass of the sugar
To find the molar mass of the sugar, rearrange the osmotic pressure formula II = MRT, solve for M (molarity), use the given osmotic pressure and temperature in Kelvin to calculate the molarity, and then use the molarity and given mass of the sugar to find the molar mass.
Explanation:To find the molar mass of the sugar, we need to rearrange the osmotic pressure formula (II = MRT) to solve for M (molarity). We can use the given osmotic pressure (31.5 mmHg) and temperature (39°C) in Kelvin (312 K) to calculate the molarity.
Then, we can use the molarity and the given mass of the sugar (1.10 g) to find the number of moles. Finally, dividing the mass by the number of moles will give us the molar mass of the sugar, which is approximately 176.1 g/mol.
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Marsha can cook 5 cakes or 10 pizzas in an hour Howard can cook 3 cakes or 12 pizzas in a hour. Which items should each person specialize in
Predict what precipitate will form when a solution of barium chloride is mixed with a solution of potassium sulfate.
The chemical reaction between solution of barium chloride and potassium sulfate will form a precipitate of barium sulfate.
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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What is the density of an object having a volume of 253 ml and a mass of 91.6 g?
What is the concentration of k+ ions in a 0.025 m k2co3 solution assuming complete dissociation?
The complete dissolution of 0.025 M [tex]\rm K_2CO_3[/tex] will result in 0.050 M [tex]\rm K^+[/tex].
The complete dissolution of [tex]\rm K_2CO_3[/tex] will result in:
[tex]\rm K_2CO_3\;\rightarrow\;2\;K^+\;+\;CO_3^2^-[/tex]
1 molecule of [tex]\rm K_2CO_3[/tex] will gives 2 molecules of [tex]\rm K^+[/tex].
So 0.025 M [tex]\rm K_2CO_3[/tex] will give: 1 M
0.025 M [tex]\rm K_2CO_3[/tex] = [tex]\rm 0.025\;\times\;2\;K^+[/tex] M
= 0.05 M [tex]\rm K^+[/tex].
Thus the complete dissolution of 0.025 M [tex]\rm K_2CO_3[/tex] will result in 0.050 M [tex]\rm K^+[/tex]
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In a particular experiment, a 2.00-g sample of cao is reacted with excess water and 2.14 g of ca(oh)2 is recovered. what is the percent yield in this experiment?
Final answer:
In an experiment with a 2.00-g sample of CaO reacting to form 2.14 g of Ca(OH)₂, the percent yield is calculated as more than 100%, suggesting an error in measurement or theoretical yield assumptions.
Explanation:
In this experiment, a 2.00-g sample of CaO is reacted with excess water to produce Ca(OH)₂, and 2.14 g of Ca(OH)₂ is recovered. To calculate the percent yield of this reaction, we first need to understand that percent yield is calculated using the formula: percent yield = (actual yield/theoretical yield) x 100%. However, to calculate the percent yield in this case, we will presuppose that under ideal conditions, the reaction of the 2.00 g of CaO would yield an equivalent molar amount of Ca(OH)₂.
Without going into detailed stoichiometry and assuming perfect conversion, the amount ofCa(OH)₂ produced directly mirrors the starting amount of CaO due to the 1:1 molar ratio in the reaction CaO + H2O = Ca(OH)₂. If 2.14 g of Ca(OH)2 is the actual yield and we accept the theoretical yield as 2.00 g (for simplicity, and acknowledging that the real theoretical yield would require molar mass calculations), the percent yield can be calculated as follows: percent yield = (2.14 / 2.00) x 100% = 107%.
The calculation example here demonstrates the concept of percent yield but importantly highlights that a yield over 100% indicates a discrepancy, possibly in measurement or assumption of theoretical yield without correct stoichiometric calculation.
You are trying to determine the volume of the balloon needed to match the density of the air in the lab. You know that if you can get the balloon's density below this value, it will float. You measure both the temperature in the room as well as the mass of the balloon you will use and find they are 20.0°C and 0.570 grams, respectively. What volume of balloon will generate a density equal to that of the air around it? (Hint: Use the relationship you calculated above to determine the air density at the temperature given)
To solve this problem, we must be given first the density of air at 20 degrees Celsius. Looking up online, this is equal to:
density air (20C) = 0.0012041 g/mL
so that the volume is:
volume balloon = 0.57 g / (0.0012041 g/mL)
volume balloon = 473.38 mL
Sediment spreads horizontality and it goes from youngest on top to oldest on bottom. When sediment deposits in water, it also spreads flat in all directions until it either runs out of material and pinches off or it hits a barrier. This is known as the _____.
A.law of original horizontality
B.law of superposition
C.law of original lateral continuity
D.law of gravity and oppositional force
E.law of cross-cutting relationships
Answer: It follows the law of original lateral continuity.
Explanation: Sediment is something that settle down in the liquid.
Law of Original Horizontality: This law states that the rocks and sediments are deposited horizontally.
Law of Superposition: This law states that the younger rocks are deposited or super imposed on the oldest rocks.
Law of Original Lateral Continuity: This law states that the sediment layers extent laterally or horizontally in all the direction as the younger rocks are added to the older rock which means that they are laterally continuous.
Law o Gravity and oppositional force: This law states that each particle attracts every other particle in the universe and is directly proportional to the product of the masses of two particles and inversely proportional to the square of the distance between them.
Law of cross-cutting relationship: This law states that fault which is cutting the rock is always younger than the rock.
From the above explained Law's, it is clear that the sediment follows Law of original lateral continuity.