78.2g is the mass in grams of potassium chloride is produced if 21.0g of potassium metal.
A body's mass is an inherent quality. Prior to the discoveries of the atom as well as particle physics, it was widely considered to be tied to the amount of matter within a physical body. It was discovered that, despite having the same quantity of matter in theory.
Different atoms and elementary particles have varied masses. There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent.
2K + Cl\(_2\) →2KCl
moles of K = 21.0/ 20=1.05 moles
according to stoichiometric ratio
moles of KCl = 1.05 moles
mass of KCl = 1.05×74.5
= 78.2g
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The fluoride in many toothpaste is tin (ll) fluoride produced by the reaction of tin and gaseous hydrogen fluoride.
Write this in a word and skeleton equation
Answer:
Word equation: Tin + Hydrogen fluoride → Tin (II) fluoride + Hydrogen gas
Skeleton equation: Sn + 2HF → SnF2 + H2
A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 90.0 mL. The liquid solvent has a mass of 47.3 g and a density of 0.865 g/mL. Determine the mass of the solid given its density is 3.25 g/mL.
The mass of the solid will be 114.7 g.
Density problemThe density of a substance is given as the ratio of its mass and its volume.
Also, a solid will always displace its own volume in a liquid.
Mass of liquid solvent = 47.3 g
Density of liquid solvent = 0.865 g/mL
Recall that: density = mass/volume
Volume of liquid solvent = mass/density
= 47.3/0.865
= 54.7 mL
Volume of solid + liquid solvent = 90.0 mL
Volume of solid = 90.0 - volume of liquid solvent
= 90.0 - 54.7
= 35.3 mL
Density of solid = 3.25 g/mL
Mass of solid = density x volume
= 3.25 x 35.3
= 114.7 g
The mass of the solid is 114.7 g.
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3. A Wilkinson’s catalyst is widely used in the hydrogenation of alkenes. Show a catalytic cycle, including: i. chemical structure of the catalyst, with complete stereochemistry ii. molecular geometry of catalyst iii. type of reactions involved iv. the appropriate starting material, reagent and solvent v. major and minor end-products vi. all intermediates, for each reaction stated in (iii)
We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.
What are the steps involved?Here's an overview of the catalytic cycle, including the necessary details:
i. Chemical structure of the catalyst:
Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]
ii. Molecular geometry of the catalyst:
The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.
iii. Type of reactions involved:
The catalytic cycle involves several reactions, including:
Oxidative addition: The rhodium center undergoes oxidative addition, reacting with molecular hydrogen (H2) to form a dihydride intermediate.Alkene coordination: The alkene substrate coordinates to the rhodium center, forming a π-complex.Hydrogenation: The coordinated alkene undergoes hydrogenation, resulting in the addition of hydrogen atoms to the double bond and formation of a metal-alkyl intermediate.Reoxidation: The metal-alkyl intermediate reacts with a hydrogen molecule to regenerate the rhodium dihydride species.iv. Starting material, reagent, and solvent:
The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).
v. Major and minor end-products:
The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.
vi. Intermediates:
The intermediates in the catalytic cycle include:
Rhodium dihydride complex: [RhH2(PPh3)3]Alkene-Rhodium π-complex: [Rh(η2-alkene)(PPh3)3]Metal-alkyl intermediate: [Rh(alkyl)(PPh3)3]These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.
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Average Volume of A Drop. 15 Drops for 1 ML
Note that if the water volume (ML) in a graduated cylinder is 30.0 and the volume of a drop of water is 1.00 and the number of drops is 15, the average drop volume (ML) is 2.0 mL.
What is average drop volume?Average drop volume is a measurement of a droplet's average volume. It is employed in a wide range of applications, including laboratory experimentation, medical research, and medication delivery systems.
It aids in deciding the proper amount of liquid to utilize in a certain condition. It also aids in the creation of novel pharmaceuticals and assuring exact and constant dosing in medical treatments.
You may calculate the average drop volume by dividing the total amount of water (30.0 mL) by the number of drops (15). That is to say:
(30.0 mL divided by 15 drops = 2.0 mL/drop)
Hence where the number of drops is 15mL and the volume of one drop is 1.00mL, the average Volume of a Drop is 2.0mL
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Do Metals or Nonmetals have larger ion size compared to the size of the neutral atom?
A. Metals
B. Nonmetals
PLZ HELP ITS 50 POINTS DONT JUST PUT A RANDOM ANSWER OR I WILL REPORT
Answer:
b
Explanation:
Answer:B. nonmetals
Explanation:
in 3 minutes, one half of an original sample of polonium will decay. What happens to the other half?
How many moles are in 235,000 molecules of methane gas
The number of moles in 235000 molecules of methane is 3.9 × 10⁻¹⁹ mol.
What is a mole?A mole can be defined as a standard unit that is utilized to find a given count of particles. The particles counted are chemically the same and individually distinct.
A mole can be used to determine quantities of atoms, molecules, ions, or other particular particles. The number of particles in 1 mole is 6.023 ×10 ²³ which is known as Avogadro’s constant.
Given, the number of molecules of methane = 235,000
The mass of one mole of methane = 16 g
The number of molecules in one mole of methane = 6.023 × 10²³
235000 molecules of methane have moles = 235000/6.023 × 10²³
= 3.9 × 10⁻¹⁹ mol
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A galvanic cell is constructed of one half cell in which a silver wire is placed into a 1.00 Maqueous solution of silver nitrate and the other half cell is made of a zinc wire in a 1.00 M aqueous solution of zinc nitrate. calculate gibbs free energy
Answer:
https://www.plps-k12.org/site/handlers/filedownload.ashx?moduleinstanceid=2482&dataid=3257&FileName=Ch%2017%20Electrochemistry%20Practice%20Problems%20I%20-%20key.pdf
Explanation: This is all the answers just go to this link to help is a bunch of pages to help and with answers on them too! Can I get brianliest plz
How many sodium (Na) and oxygen (O) atoms are needed to form the ionic compound sodium oxide?There needs to be 1 Na atom and 2 O atoms to form Na2OThere needs to be 2 Na atoms and 2 O atoms to form Na2OThere needs to be 1 Na atom and 1 O atom to form Na2OThere needs to be 2 Na atoms and 1 O atom to form Na2O
Answer:
There needs to be 2 Na atoms and 1 O atom to form Na2O.
Explanation:
If you go to see the periodic table to review the oxidation states of elements, you can see that Na only has +1 as oxidation state, and O only has -2 as oxidation state.
The algebraic sum of these oxidation states in a neutral compound (not ions) must be zero, so let's apply the following technique to form the compound:
So the compound would be Na2O, so we need 2 atoms of Na, and 1 atom of O.
The answer would be: There needs to be 2 Na atoms and 1 O atom to form Na2O.
please help me with these
1) Diesel has a higher viscosity than petrol.
2) Petrol is more flammable than diesel.
3) The formula will be C₁₀H₂₂.
4) The equation is; 2C8H18+25O2→16CO2+18H2O.
What is the hydrocarbon?Depending on the precise composition and temperature, the viscosity of gasoline and diesel can change. In general, diesel is more viscous than gasoline. Higher viscosity fluids are thicker and flow more slowly than lower viscosity fluids because viscosity relates to the resistance of a fluid to flow.
Diesel is less flammable than gasoline. The lowest temperature at which gasoline can evaporate and turn into an ignitable combination in air is known as its flash point, and it is lower for gasoline. Compared to diesel fuel, petrol vapors are much more flammable and can ignite at lower temperatures.
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An aqueous solution of Ca(OH)2 at 25 oC has a pH of 12.4. Assume Ca(OH)2 fully dissociates. Calculate the concentration (in M) of Ca(OH)2. Report to 3 decimal places.
Answer:
the first one may be more complex so the second one will be simplified :)
Explanation:
An ionic bond is a bond
Answer:
That involve the complete transfer of an electron from one atom of an element to another
1. what is an atom
2. what is a chemical process
3. WHat is a chemical reaction
Answer:
1.An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of positively-charged protons and electrically neutral neutrons with negatively-charged electrons orbiting this nucleus.
2.a chemical process is a method or means of somehow changing one or more chemicals or chemical compounds.
3. a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.
which part of the red blood cells can you find hemoglobin
Answer:
The cytoplasm of erythrocytes is rich in hemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the red color of the cells and the blood. Each human red blood cell contains approximately 270 million of these hemoglobin molecules.
Explanation:
hope this helps(;
Which type of rock forms when an existing rock changes under extreme pressure and intense heat?
A
igneous
B
sedimentary
C
metamorphic
Answer:
c
Explanation:
metamorphic rocks
Answer:
C. Metamorphic
Explanation:
When fossil fuels are burned, they emit carbon dioxide into the atmosphere. After centuries of large amounts of carbon dioxide accumulating in the atmosphere, the earth's temperature increases by 1°C.
What is the connection between increasing carbon dioxide and increasing temperature?
The connection between increasing carbon dioxide and increasing temperature is: carbon dioxide absorbs heat from the sun and traps it in earth's atmosphere. Since the heat cannot escape, it causes the earth's temperature to increase which is the first option.
When carbon dioxide (CO₂) and other greenhouse gases are present in the atmosphere, they act as a natural blanket, allowing sunlight (solar radiation) to pass through and reach the Earth's surface. Some of this solar radiation is absorbed by the Earth's surface, while the rest is reflected back towards space as heat (infrared radiation). However, greenhouse gases like carbon dioxide have the property of absorbing and re-emitting infrared radiation.
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sodium ions, oxygen (o2), and glucose pass directly through lipid bilayers at dramatically different rates. which of the following choices presents the correct order, from fastest to slowest?
The correct order from fastest to slowest is oxygen (O2), glucose, and sodium ions.
Lipid bilayers are composed of two layers of lipid molecules that form a barrier around the cell. The barrier is selectively permeable, meaning that it only allows certain molecules to pass through. The rate at which molecules pass through the lipid bilayer depends on their size, charge, and solubility in lipids.
Oxygen (O2) is a small, uncharged molecule that is highly soluble in lipids. This allows it to pass through the lipid bilayer at a fast rate. Glucose is a larger, uncharged molecule that is less soluble in lipids. This means that it passes through the lipid bilayer at a slower rate than oxygen. Sodium ions are charged particles that are not soluble in lipids. This makes it difficult for them to pass through the lipid bilayer, and they do so at a very slow rate.
Therefore, the correct order from fastest to slowest is oxygen (O2), glucose, and sodium ions.
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Why starch peanut doesn't dissolve in acetone
Peanut doesn't dissolve in acetone because the crosslinking structure of polystyrene can be broken down in some organic solvents such as acetone.
What is acetone?
Acetone, is described as an organic compound with the formula (CH₃)₂CO which is the simplest and smallest ketone.
Acetone is known to be colorless, highly volatile and flammable liquid with a characteristic pungent odor.
When the polystyrene peanuts are added to the acetone, they do not really dissolve in the acetone, but instead go through a process called “swelling” that allows the trapped gases to escape.
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If you burn 57.9 g of hydrogen and produce 517 g of water, how much oxygen reacted?
In order to make water (H2O) out of hydrogen (H2), you also need OXYGEN (O2) gas. So, first write a correctly balanced equation for this reaction.
2H2(g) + O2(g) ==> 2H2O
Now, convert 59.5 g of H2 to moles, then figure out moles of H2O and then moles of O2 used to do this.
moles H2 = 59.5 g H2 x 1 mole/2 g = 29.8 moles H2
moles H2O formed = 531 g H2O x 1 mole/18 g = 29.5 moles H2O
So, the mole ratio of H2 to H2O is 1:1 meaning that the moles of O2 used will be 1/2 that amount. This is the case because from the balanced equation you see that 1 O2 reacts with 2 H2 and produces 2 H2O.
Amount of O2 used = 29.8/2 = 14.9 moles
Analyse the step-by-step of guiding students on how to write balanced chemical equations and ionic equation
Here is a step-by-step guide for guiding students on how to write balanced chemical equations and ionic equations:
Steps:
1. Determine the reactants and products: Start by identifying the reactants and products in the chemical reaction. This involves reading the problem and identifying the substances that are being reacted.
2. Write the unbalanced equation: Once the reactants and products have been identified, write the unbalanced chemical equation using the chemical formulas for each reactant and product.
3. Balance the equation: To balance the equation, adjust the coefficients of the reactants and products so that the number of atoms of each element is equal on both sides of the equation. Begin by balancing the atoms of elements that appear only once on each side of the equation, and then move on to elements that appear more than once.
4. Check the balanced equation: After balancing the equation, double-check to make sure that the number of atoms of each element is the same on both sides of the equation.
5. Write the ionic equation: To write the ionic equation, break apart any soluble ionic compounds into their individual ions. Then, cancel out any spectator ions that appear on both sides of the equation.
6. Check the ionic equation: Double-check the ionic equation to make sure that the same number and type of ions appear on both sides of the equation.
7. (Optional) Include states of matter: It is common practice to include the states of matter (solid, liquid, gas, aqueous) of the reactants and products in the chemical equation. This can be done by using abbreviations in parentheses after each chemical formula.
By following these steps, students can learn how to write balanced chemical equations and ionic equations accurately and efficiently.
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Report the following measurement using the correct number of significant figures.
The measurement can be reported with three significant figures as follows: 3.90 mm.
How to report the measurementThe measurement can be reported with three significant figures as 3.90 mm. The record is a reading from a ruler that shows the specific point where the red line meets and the exact measurement is in three significant figures because none of them can be disregarded.
So, the accurate reading is 3.90. When the accurate reading is used, it ensures that the result of the measurement will be as expected.
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Chlorine dioxide is used as a disinfectant and bleaching agent. In water, it reacts to form chloric acid (HClO3),
according to the following balanced equation:
6 ClO2 + 3 H2O → 5 HClO3 + HCl
If excess ClO2 is mixed with 18.0 mL of H2O (d = \(\frac{0.998g}{1ml}\) ) how many grams of HClO3 are formed?
PLEASE DO NOT JUST GIVE THE ANSWER!!! I really would like to learn HOW to do this so please give explanations for each step as you solve it. Thanks!
the most likely explanation for the increase in average beak size of the medium ground finch is that the
Answer:
Well according to the Law of Evolution, depending on where the Finch lives and what it eats depends on it's beak size. For example, if a Finch lives on the coast and eats small fruits it will have a short and stubby beak to peck at the fruits, but if the Finch ate crabs it's beak would be long to swoop down and pluck up crabs.
Hope this helps!
I will brainliest you if you answer my question thank you pls read the photo.
Answer:
The flow of information from the starting material DNA to the final product protein is depicted in the core dogma of molecular biology. That is depicted in the diagram. It also shows where each step takes place. Replication is the process of passing information from one DNA to another DNA, as seen in the diagram. This occurs within the nucleus. Why is each process carried out in a certain location? It is because it is where the essential substance may be found. As a result, replication occurs in the nucleus, where the necessary enzymes and ingredients for replication are present.
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Convert the following temperatures from degrees Celsius to degrees Kelvin: 0 degrees C, 30 degrees C, 100 degrees C.
Conversion from degree Celsius to Kelvin :
1.
0° C = 0 + 273.15 = 273.15 K
2.
30 ° C = 30 + 273.15 = 303.15 K
3.
100° C = 100 + 273.15 = 373.15 K
What the expected outcome is, if the MDS is successfully implemented
If the MDS (Minimum Data Set) is successfully implemented, several positive outcomes can be expected. The MDS is a standardized assessment tool used in healthcare settings to evaluate the physical, mental, and psychosocial well-being of patients.
Its successful implementation can lead to improved patient care, more efficient resource allocation, and enhanced data analysis.With the MDS in place, healthcare providers can gather consistent and comprehensive data about patients, enabling better understanding of their needs and tailoring of individualized care plans.
This can result in improved treatment outcomes and patient satisfaction. Additionally, the MDS facilitates effective communication and information sharing among healthcare professionals, leading to coordinated care and reduced errors.From a broader perspective, successful implementation of the MDS allows for accurate and reliable data collection, enabling robust research and evidence-based decision-making.
This can contribute to advancements in healthcare practices, policy development, and quality improvement initiatives. Ultimately, the successful implementation of the MDS can enhance patient outcomes, improve healthcare delivery, and drive positive changes in the healthcare system as a whole.
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Glucose, C6H12O6, is used to prepare intravenous feeding solutions. What volume of 5.0 % W/V glucose solution can be prepared using 125 g of glucose? Show your working.
Please if the answer is correct, ill give brainliest
250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.
We use the below formula to solve our problem,w/v = [ mass of solute (g) / volume of solution (mL) ] × 100
Substitute the values from our problem,5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100
Rearranging the formula, we havevolume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100
Substitute further for w/v,volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100
Simplify the expression,volume of solution (mL) = [ 125 g / 0.05 ] x 100
Hence, the volume of solution (mL) = 250,000 mL or 250 Lsummarize how energy changes during a chemical reaction as bonds are broken and formed
During a chemical reaction: bonds in the reactants are broken new bonds are made in the products Energy is absorbed to break bonds. Bond-breaking is an endothermic process. Energy is released when new bonds form. Bond-making is an exothermic process.
Energy is absorbed when bonds are broken, and it is evolved when bonds are established.
What are chemical bonds?Chemical bonds is defined as the creation of a chemical compound through the creation of a chemical link between two or more atoms, molecules, or ions. To form bonds, atoms exchange or swap their valence electrons. To reach a complete outer energy level, which is the most stable configuration of electrons, atoms must form chemical bonds.
Because more energy is required to break bonds than is produced when new bonds are formed, energy is absorbed in some reactions. As a result, during a reaction, many kinds of bonds may form. Energy is released as a result of the creation of bonds. Energy is absorbed when bonds are broken.
Thus, when bonds are broken, energy is absorbed, and when bonds are formed, energy is evolved.
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Ions are particles that have a different number of protons and ____. Ions are electrically charged. Ions can be formed when a metal reacts with a Non-metal. Metal atoms ____ electrons to form ____ ions. Non metals ____ electrons to form _____ions.
Ions are simply referred to as electrically charged atoms. Ions are formed when atoms lose or gain electrons to become positively or negatively charged.
Positively charged atoms are called cations (+) while negatively charged atoms are called anions (-).
According to this question, ions are electrically charged that can be formed when a metal reacts with a non-metal.
Metals like calcium, pottasium etc. lose electrons to form positive ions or cations while non-metals such as nitrogen, oxygen etc gain electrons to form negative ions or anions.
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14. What type of materials are spun together to make yarns?
Answer:
cotton
Explanation:
which is typically spun into fine yarn for mechanical weaving or knitting into cloth.