different between practical work inside a lab and outside a lab
Answers
Answer: Outside a lab would likely be something more akin to baking or making electrolytic cells for silver plating while lab work is for a scientific cause like research and experiments doing the scientific experiments.
Related Questions
How many mmol of iron are there in 650 mg of iron? O A. 11.6 mmol Fe B. 363.02 mmol Fe C. 55.85 mmol Fe D. 8.95 mmol Fe
Answers
There are 11.6 mmol of iron in 650 mg of iron.
Given the mass of iron as 650 mg. The molar mass of iron is 55.85 g/mol.
We need to calculate how many millimoles (mmol) are present in the given amount of iron.
We will use the following conversion:
1 g = 1000 mg
1 mol = molar mass in grams
1 mmol = 0.001 mol
Number of moles of iron
= 650 mg ÷ 1000 mg/g
= 0.65 g ÷ 55.85 g/mol
= 0.0116 mol
Number of millimoles of iron
= 0.0116 mol ÷ 0.001 mol/mmolar mass of iron
= 11.6 mmol
Hence, there are 11.6 mmol of iron in 650 mg of iron. Therefore, the correct option is A. 11.6 mmol Fe.
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using retrosynthetic analysis, determine which compound(s) could lead to the alcohol shown below in a single step.
Answers
The correct option is D. When the alkane reacts with sulphuric acid in the presence of water, alcohol obtained is a project.
Alkanes are a class of organic compounds composed exclusively of hydrogen and carbon atoms, characterized by single covalent bonds between the carbon atoms, resulting in a saturated structure. They are the simplest type of hydrocarbons and serve as the foundation for more complex organic molecules.
Alkanes are also known as paraffins and often referred to as "straight-chain" hydrocarbons. They can have varying numbers of carbon atoms, ranging from one (methane) to thousands, with corresponding molecular formulas such as CₙH₂ₙ₊₂. These compounds are primarily derived from fossil fuels and are commonly found in natural gas, petroleum, and various forms of crude oil.
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Which one of the following substances would you predict to have the highest vapor pressure at given temperature? in these line drawings, a carbon is implicit at the end of a line (bond) or where two or more lines come together. carbon requires four bonds, so any missing bonds are implicitly bonds to hydrogen atoms
Answers
As a result, the material with the lowest boiling point will have the maximum vapor pressure at ambient temperature. The material with the lowest vapor pressure is that which has the greatest boiling point.
What variables influence vapor pressure?
Vapor pressure is the name given to the force produced when liquids evaporate. Three factors that typically affect vapor press performance are surface area, intermolecular forces, and temperature. Molecules have variable vapor pressures depending on their temperature.
What is vapour pressure, for instance?
It is essential to remember that a liquid's vapor pressure is equal to the atmospheric pressure while it is boiling. For instance, water's vapor pressure when it boils at sea level is 1 atmosphere since the surrounding pressure is also 1 atmosphere.
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Pressure is caused by __________ within the container.
Answers
comman factors that can lead to high blood pressure include.
When the coastal land is warmer than the nearby water, what type of breeze it forms?
Answers
Answer: Your answer is a Sea breeze
A sea breeze, much like the majority of weather conditions experienced at the coast, is the result of the contrasting way in which the land and ocean react to changes in temperature
Hope this helps!
Answer:
A sea breeze,
Explanation:
also known as an onshore breeze, occurs because of the differences in air pressure created by the difference in temperature between the ocean or water and the dry land.
How many moles are in 525 g Ca?
Answers
This is how many grams there are in 525 grams of calcium. One mole of calcium weighs 13.099 grams.
What is meant by calcium?Chemical element calcium has the atomic number 20 and the letter Ca as its symbol. At room temperature, calcium is a solid and is categorized as an alkaline earth metal.The fifth element in the periodic table and the third most prevalent metal in the earth's crust is the chemical element calcium (Ca), which has the atomic number 20. Trimorphic in nature, the metal is softer than aluminum yet harder than sodium. It doesn't produce skin burns, unlike alkaline metals like beryllium and aluminum, as well as beryllium.The protons/electrons and neutrons in a calcium atom total to 20 each. In addition, calcium's chemical characteristics include a cubic crystal structure, a white silvery appearance, and a density of 1.55 g/cm3 at 293 K. With a total of 2, 8, 8, and 2 electrons in each of its four energy levels, calcium.To learn more about calcium refer to:
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F it takes 0.0500 l of oxygen gas kept in a cylinder under pressure to fill a 4.00 l vessel in which the pressure is 0.980 atm, what was the initial pressure of the gas in the cylinder
Answers
Answer:
0.012atm pressure
Explanation:
pressure is inversly proportional to volume. Mathematically,
V1/P1=V2/P2
Hikers have noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1.0 atm, temperature is 25°C, and the volume of the chip bag is 0.985 L. At the top of the mountain, the temperature is 22°C and the chip bag has puffed up to 1.030 L.
What is the air pressure on top of the mountain?
__ atm
Answers
Answer:
0.95
Explanation:
trust
How long can a virus be kept on a plastic bag?
Answers
Answer: the longest a virus that can be kept on a plastic bag is a few hours to a couple of days.
Explanation: hope that helped!(:
Predict the polarity of 6 real molecules (O2, HF, H2O, NH3, CF4, CH3F). First, draw the
molecules and any bond dipoles. Then draw any molecular dipoles. Explain your
reasoning before you check your predictions with the simulation.
Answers
The polarity of 6 real molecules are given below,
O2- Neutral
HF- Acidic
H2O- Neutral
NH3- Basic
CF4-Nonpolar
CH3F- Polar
How to determine polarity of molecules?Predicting the polarity of molecules can be done using a variety of methods. One method is to use the molecular dipole moment, which is a measure of the separation of positive and negative charge in a molecule. Molecular dipole moments can be calculated using quantum chemistry methods such as Density Functional Theory, or other methods. Another method is to consider the electronegativity of the atoms in the molecule and the type of bond between them. Non-polar molecules have atoms with similar electronegativities and strong covalent bonds, while polar molecules have atoms with different electronegativities and polar covalent or ionic bonds. Finally, the polarity of a molecule can also be predicted by looking at its shape and symmetry. Non-polar molecules often have symmetrical shapes, while polar molecules tend to be asymmetrical.To learn more about polarity of molecules refer :
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Adaptations ONLY help an organism stay alive when they are physical and NOT when they are behavioral. true or false??
Answers
Answer:
true
Explanation:
i hope it's true, if not, then it's false, if anyone else answered but got it from the link, let me know to report it or you report it
Answer:
False.
Explanation:
Hibernation is an example of a physical adaptation. False.
What is the process of transforming raw materials collected by extractive companies into products called?
Answers
The process of turning the raw materials gathered by mining corporations into finished goods is known as material processing.
What does raw material processing entail?Manufacturing is the process of converting raw materials or component components into completed products using tools, labor, machinery, and chemical processing.
Why is the processing of materials important?The objective of material processing is to create the structural characteristics (such as crystal structure, microstructure, size, and shape) required for the product to function effectively in its intended use. Processing materials is essential to production and is at the heart of the area of materials science and engineering.
Why are materials processed?We manipulate materials to improve their strength, durability, water proofness, or even merely their aesthetic appeal. When new materials are created by combining other components, they are sometimes referred to as mixtures.
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Reactant P contains 50 J of energy, and reactant Q contains 35.3 J of energy. The reactants combine to form product PQ, which contains 104 J of energy. What is the energy transformation? Energy is absorbed because the product has more energy than the reactants have. Energy is absorbed because the product has less energy than the reactants have. Energy is lost because the product has more energy than the reactants have. Energy is lost because the product has less energy than the reactants have.
Answers
Answer:
Energy is absorbed because the product has more energy than the reactants have.
Explanation:
its A
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The average atomic mass of lithium is 6.94 amu. Based on the atomic masses of the two isotopes of lithium, how do the relative abundances of the isotopes compare?
Answers
Answer:
Answer:
a) The relative abundance of Li-6 =0.0749 = 7.49%
The relative abundance of Li-7 =1 - 0.0749 = 0.9251 =92.51%
b) The fraction of sample of lithium atoms with exact mass of 6.941 amu is 0.
The relative abundance of ⁶Li is around 0.076, and the relative abundance of ⁷Li is approximately 0.924.
To determine the relative abundances of isotopes, we need to compare the atomic masses of the isotopes and their average atomic mass.
Lithium has two stable isotopes: lithium-6 (⁶Li) and lithium-7 (⁷Li). The atomic masses of these isotopes are approximately 6.015 amu and 7.016 amu, respectively.
The average atomic mass of lithium, given as 6.94 amu, is a weighted average of the masses of the two isotopes, taking into account their relative abundances.
Let's assume the relative abundance of ⁶Li is x (in decimal form) and the relative abundance of ⁷Li is (1 - x). The average atomic mass equation can be set up as:
(6.015 amu * x) + (7.016 amu * (1 - x)) = 6.94 amu
Simplifying the equation:
6.015x + 7.016 - 7.016x = 6.94
Combining like terms:
-0.001x = -0.076
Dividing both sides by -0.001:
x ≈ 0.076
Therefore, the relative abundance of lithium-6 (⁶Li) is approximately 0.076, and the relative abundance of lithium-7 (⁷Li) is approximately (1 - 0.076) = 0.924.
In summary, the relative abundance of ⁶Li is around 0.076, and the relative abundance of ⁷Li is approximately 0.924.
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HELP
which listed elements would form metallic bonds? Check all that apply
- Bi
- Xe
- I
- Ag
- Li
Answers
Answer:
Bi (Bismuth)
Ag (Silver)
Li (Lithium)
Explanation:
Xe (Xenon) and I (Iodine) are non-metals. They cannot from a metallic bond because metallic bonds are bonds between metals only.
3. Which of the following is a reasonable ground-state electron configuration? (2 points
O1s²1p62s²2p63s²
O1s²2s²2p63s²3p64s²4d8
O1s²2s²2p63p6
O1s²2s²2p63s¹
Answers
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how deadly and destructive is the crystal movement of a volcano?
Answers
Answer:
Explosive eruptions occur when magma, which is molten rock in the ground, contains gas. ... The most dangerous features of these events are volcanic ash flows swift, ground-hugging avalanches of searing hot gas, ash and rock that destroy everything in their path.
Explanation:
NH4NO3 dissolves spontaneously and endothermically in water at room temperature. What can you deduce about the sign and size of As for this solution process relative to the size and sign of AH?
Answers
Based on the fact that NH4NO3 dissolves spontaneously and endothermically in water at room temperature, we can deduce that the sign of As (the entropy change) for this solution process is positive, indicating an increase in disorder of the system.
Additionally, the size of As must be sufficiently large to compensate for the positive AH (the enthalpy change), which reflects the endothermic nature of the process. The fact that NH4NO3 dissolves spontaneously suggests that the overall Gibbs free energy change, ΔG, is negative, indicating that the process is energetically favorable. The precise values of AH and As would depend on the specific conditions of the dissolution process, such as temperature and pressure.
When NH4NO3 dissolves endothermically in water at room temperature, it means that the dissolution process absorbs heat, making ΔH positive. Since the dissolution occurs spontaneously, the process must have a negative Gibbs free energy change, ΔG. For a spontaneous endothermic reaction, the increase in entropy (ΔS) must be significant enough to outweigh the positive ΔH, resulting in a negative ΔG. Therefore, the sign of ΔS is positive and its size is relatively larger than the size of ΔH, leading to a spontaneous and endothermic dissolution process for NH4NO3.
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Define an ideal gas and explain under which conditions you may reasonably approximate a real gas as an ideal gas. Also mention conditions under which it would be inappropriate to approximate a real gas as an ideal gas. (you may need to use a search engineto help you out here)
Answers
Answer:
High temperature and low pressure
Explanation:
According to the kinetic molecular theory, gases are composed of small particles called molecules which are in constant motion.
At high temperature and low pressure, gas molecules possess high kinetic energy and move at high velocities hence intermolecular interaction is almost none existent and real gases approach the behavior of ideal gases.
Which of the following is the strongest base?A) NO3^-B) F^-C) Cl^-D) ClO4^-E) H2O
Answers
F^- is the strongest base as it has the highest affinity for accepting a proton, followed by Cl^-, ClO4^-, NO3^-, and H2O.
Among the given options, the strongest base is the one that has the highest affinity for accepting a proton (H+). To determine this, we can analyze the conjugate acids of each base.
A) NO3^- can accept a proton to form HNO3. Nitric acid is a strong acid, which indicates that NO3^- is a weak base.
B) F^- can accept a proton to form HF. Hydrofluoric acid is a weak acid, implying that F^- is a stronger base than NO3^-.
C) Cl^- can accept a proton to form HCl. Hydrochloric acid is a strong acid, suggesting that Cl^- is a weaker base than F^-.
D) ClO4^- can accept a proton to form HClO4. Perchloric acid is a strong acid, indicating that ClO4^- is a weaker base than F^- and Cl^-.
E) H2O can accept a proton to form H3O^+. Water acts as both an acid and a base, but in this context, it is weaker than the other options.
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in the synthesis of dansylalanine, the boc group on compound 1 most likely functions to:
Answers
It is stable to most peptide synthesis conditions, such as acidic or basic conditions, allowing for the synthesis of long peptide chains without unwanted side reactions.
Dansylalanine is synthesized by reacting N-dansyl chloride with the amine group of Boc-L-alanine.
The Boc group on compound 1 in the synthesis of Dansylalanine most likely functions to protect the α-amine group of L-alanine from N-dansylation.
The α-amine group of L-alanine is a nucleophilic center that is highly reactive.
It readily reacts with electrophiles such as the N-dansyl group in N-dansyl chloride, which could have led to the formation of unwanted products if left unprotected.
The presence of the Boc group in Boc-L-alanine shields the α-amine group, making it less reactive towards electrophiles.
Therefore, when N-dansyl chloride is added to Boc-L-alanine, it reacts selectively with the carboxylate group, forming a stable amide bond with the α-amine group protected.
Once the reaction is complete, the Boc group can be removed by treating the product with an acid, unmasking the α-amine group and revealing the desired dansylalanine.
The use of the Boc group as a protecting group in peptide synthesis has become prevalent because of its stability and ease of removal.
It is stable to most peptide synthesis conditions, such as acidic or basic conditions, allowing for the synthesis of long peptide chains without unwanted side reactions.
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how many grams of nh3 are needed to react with 2g of k2ptcl4 ?
Answers
To determine the grams of NH3 needed to react with 2g of K2PtCl4, we need to first determine the molar ratio between NH3 and K2PtCl4 using their balanced chemical equation.
The balanced equation for the reaction is:
2 NH3 + K2PtCl4 -> Pt(NH3)2Cl2 + 2 KCl
From the equation, we can see that 2 moles of NH3 react with 1 mole of K2PtCl4. Now, we need to calculate the moles of K2PtCl4 present in 2g:
Molar mass of K2PtCl4 = 2(39.10 g/mol) + 195.08 g/mol + 4(35.45 g/mol) = 415.75 g/mol
Moles of K2PtCl4 = Mass / Molar mass = 2g / 415.75 g/mol = 0.00481 mol
Since the mole ratio is 2:1 (NH3:K2PtCl4), we need half the number of moles of NH3:
Moles of NH3 = 0.00481 mol / 2 = 0.00241 mol
Finally, we can calculate the mass of NH3 using its molar mass:
Molar mass of NH3 = 14.01 g/mol + 3(1.01 g/mol) = 17.03 g/mol
Mass of NH3 = Moles of NH3 * Molar mass of NH3 = 0.00241 mol * 17.03 g/mol = 0.041 g
Therefore, approximately 0.041 grams of NH3 are needed to react with 2 grams of K2PtCl4.
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what is the concentration (m) of ch3oh in a solution prepared by dissolving 21.4 g of ch3oh in sufficient water to give exactly 320.0 ml of solution?
Answers
The concentration of CH₃OH in the solution prepared by dissolving 21.4 g of CH₃OH in sufficient water to give exactly 320.0 ml of solution is 0.668 M.
To calculate the concentration of CH₃OH in the solution, we first need to convert the given mass of CH₃OH (21.4 g) into moles. The molar mass of CH₃OH is 32.04 g/mol, so the number of moles of CH₃OH can be calculated as:
n = mass / molar mass
n = 21.4 g / 32.04 g/mol
n = 0.6677 mol
Next, we need to calculate the volume of the solution in liters:
V = 320.0 ml / 1000 ml/L
V = 0.320 L
Finally, we can calculate the concentration (molarity) of CH₃OH in the solution using the formula:
M = n / V
M = 0.6677 mol / 0.320 L
M = 2.086 M
Therefore, the concentration of CH₃OH in the solution is 0.668 M.
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Can any element have a charge of -1, if not what element can?
Answers
No, but Group 1 elements can. Group 1 elements (alkali metals such as Li, Na, K...) all have one valence electron that they donate when forming ionic bonds. This will cause them to have a charge of +1.
What is occurring at the anode of the electrochemical cell containing the reaction represented by this equation?
Zn + Cu2+ → Cu + Zn2+
Answers
In the given chemical equation, oxidation takes place at anode of the electrochemical cell .
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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question unless otherwise instructed, you may use the periodic table in the chemistry: problems and solutions book for this question. which element is most likely the best conductor of heat?
Answers
Silver is most likely the best conductor of heat according to the periodic table.
The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.
The components can be classified as metals, nonmetals, or metalloids. The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.
As to why silver is the most excellent conductor, the reply is that its electrons are more liberated to move than those of the other components.
This has got to do with its valence and gem structure. Most metals conduct power. Other components with tall electrical conductivity, are aluminum, zinc, nickel, press, and platinum. Brass and bronze are electrically conductive amalgams, instead of components.
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when the temperature of a rigid hollowsphere containing 685 l of helium gasis held to 621 k, the pressure of the gasis 1 kpa. how many moles ofhelium does the sphere contain?
Answers
Answer:
610 k because is the hollwsphere is the gasis and 1 kpa of helium
What is the measure of the indicated angle? 37∘ 53∘ 180∘ 127∘
Answers
Answer:
53∘
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phytoremediation is a process used to: a) remove impurities from metal ores. b) absorb toxic materials from the soil. c) treat harmful gases produced by smelting. d) neutralize acid mine drainage.
Answers
Phytoremediation is a process used to "absorb toxic materials from the soil". The correct option is B.
It involves the use of plants to remove harmful substances such as heavy metals, pesticides, and other pollutants from contaminated soil.
This method has been proven effective in cleaning up polluted sites, particularly those contaminated with heavy metals like lead and cadmium.
Plants can take up these contaminants through their roots, and store them in their tissues or break them down into less harmful substances.
Phytoremediation can be a cost-effective and sustainable alternative to traditional remediation methods, such as excavation or chemical treatments. It also has the added benefit of improving soil quality and promoting biodiversity.
Overall, phytoremediation has the potential to be a valuable tool in environmental cleanup efforts, particularly in areas where other methods are not feasible or environmentally friendly.
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What mass of barium sulfate (233 g/mol) is produced when 125 mL of a 0.150 M solution of barium chloride is mixed with 125 mL of a 0.150 M solution of iron(III) sulfate
Answers
Answer:
4.37 g of barium sulphate
Explanation:
The reaction equation is;
3BaCl2(aq) + Fe2(SO4)3(aq) ---->3 BaSO4(s) + 2FeCl3(aq)
From the question, the number of moles of both barium chloride and FeSO4 = 125/1000 L × 0.150 M = 0.01875 moles
To find the limiting reactant;
3 moles of barium chloride yields 3 moles of barium sulphate
0.01875 moles of barium chloride yields 3 × 0.01875 moles/3 = 0.01875 moles of barium sulphate
1 mole of iron III sulphate yields 3 moles of barium sulphate
0.01875 molesof iron III sulphate yields 0.01875 moles ×3/1 = 0.05625 moles of barium sulphate
Hence,barium chloride is the limiting reactant
Amount of barium sulphate produced = 0.01875 moles × 233 g/mol = 4.37 g of barium sulphate