A drug tagged with 9943Tc (half-life = 6.05 h) is prepared for a
patient. The original activity of the sample was 1.10 Bq. (a)
Calculate the time constant for this isotope. (b) Calculate the
activity A drug tagged with 99 43 Tc (half-life = 6.05 h) is prepared for a patient. The original activity of the sample was 1.10 Bq. (a) Calculate the time constant for this isotope. Note that your value shou
Answers
The time constant for the isotope is approximately 8.73 h. The activity of the sample after it has sat on the shelf for 2.00 h is approximately 0.98 Bq.
Here is the explanation :
(a) To calculate the time constant (τ) for the isotope, we can use the formula:
\(\tau = \frac{\ln(2)}{\lambda}\)
Where:
ln(2) is the natural logarithm of 2, approximately 0.693
λ is the decay constant, which is equal to \(\frac{\ln(2)}{\text{half-life}}\)
Given:
Half-life = 6.05 h
Calculating the decay constant:
\($\lambda = \frac{\ln(2)}{6.05 h}$\)
Substituting the values:
\(\[\tau = \frac{0.693}{\frac{\ln(2)}{6.05\,\text{h}}}\]\)
Simplifying:
τ ≈ 8.73 h
Therefore, the time constant for this isotope is approximately 8.73 h.
(b) To calculate the activity of the sample after it has sat on the shelf for 2.00 h, we can use the decay equation:
\(A(t) = A_0 * e^{-\lambda t}\)
Where:
A(t) is the activity at time t
A₀ is the initial activity
λ is the decay constant
t is the time
Given:
Initial activity (A₀) = 1.10 Bq
Time (t) = 2.00 h
\(\lambda \approx \frac{\ln(2)}{6.05\,\mathrm{h}}\)
Substituting the values:
\(A(t) = 1.10,\mathrm{Bq} \times e^{-\left(\frac{\ln(2)}{6.05,\mathrm{h}}\right) \times 2.00,\mathrm{h}}\)
Calculating:
\(A(t) \approx 1.10\,\mathrm{Bq} \times e^{-0.1147}\)
Therefore, the activity of the sample after it has sat on the shelf for 2.00 h is approximately X Bq (where X is the calculated value).
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Complete question :
A drug tagged with 9943Tc (half-life = 6.05 h) is prepared for a patient. The original activity of the sample was 1.10 Bq. (a) Calculate the time constant for this isotope. Note that your value should be in the same units that you will select below. 8.73 Unit : Oh % O 1/h OBq (b) Calculate the activity of the sample after it has sat on the shelf for 2.00 h. Note that your value should be in the same units that you will select below. X Unit : h O Bq O 1/h %
Related Questions
Why is it more difficult to precipitate cupric acetate (verdigris) than cupric carbonate hydroxide (malachite)?
Answers
It is more difficult to precipitate cupric acetate (verdigris) than cupric carbonate hydroxide (malachite) is due to the solubility of the compounds. Cupric acetate is more soluble in water compared to cupric carbonate hydroxide.
Cupric acetate requires a higher concentration of the precipitating agent to effectively precipitate cupric acetate. In addition, the formation of malachite involves a chemical reaction between copper ions and carbonate ions in the presence of hydroxide ions, which leads to the formation of a solid precipitate. On the other hand, the formation of verdigris involves the reaction between copper ions and acetic acid to form a complex compound, which makes it more difficult to precipitate.
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Convert 3.48 Km into millimeters. The correct answer with correct units is:
A.)0.000000348M
B.)3. 4800 Mm
C.)3,480,000 mm
D.) 3, 480,000,000 mm
Answers
Answer:
C- 3480000mm
Explanation:
3480000mm
Sodium combines with water to produce sodium hydroxide and hydrogen gas. which word equation represents this violent reaction? sodium hydroxide water right arrow. sodium hydrogen sodium water right arrow. sodium hydroxide hydrogen sodium hydrogen right arrow. sodium hydroxide water sodium sodium hydroxide right arrow. water hydrogen
Answers
Answer:
B.) sodium water right arrow. sodium hydroxide hydrogen
Explanation:
Reactants are listed before the arrow and products are listed after the arrow. This symbolizes the reactants turning into the products.
Reactants --> Products
Reactants are the molecules which react with each other to make new molecules. Since sodium and water are being combined, they are the starting molecules. Products are the molecules made after a reaction occurs. Sodium hydroxide and hydrogen gas are produced, making them the ending molecules. The balanced chemical equation is:
2 Na⁺ (s) + 2 H₂O (l) --> 2 NaOH (s) + H₂ (g)
Nancy learned in school that composting is a way to cycle nutrients, and as tiny ecosystems, composting requires biotic and abiotic factors. She found four lists with ingredients to add to her compost in addition to the kitchen food scraps.
List
Biotic factors
Abiotic factors
1
fungi
worms
water
sun
2
water
worms
rocks
light
3
worms
fungi
leaves
sun
4
water
sun
fungi
worms
Which list matches with the information she received in school and why are the ingredients a good choice?
A
List 1, because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.
B
List 2, because worms and water are the only biotic factors needed. Worms as decomposers, and the water for the worms to live.
C
List 3, because the abiotic decomposers, leaves and sun provide an excellent environment for worms and fungi to start composting.
D
List 4, because for the abiotic factors to decompose the kitchen scraps, they need plenty of water and sun.
Answers
List 1 is the best choice of materials because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.
What is composting?Composting is the process whereby remains of organic matter are keep in a favorable environment and conditions in order to allow for decomposition.
Compost consists of the right mix of biotic factors suchas worms and fungi as well as abioticfactors such as water and sun.
Therefore, based in the materials provided, List 1, because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.
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Can someone help me thank you. I have to look at each picture and determine if the circuits shown are series circuits or parallel circuits. Explain how you know.
Answers
Answer:
I believe it may be-
1. Series
2. Parallel
3. Parallel
4. Series
Explanation:
In a series circuit, electricity only has one path to follow while a parallel circuit has more than one path to follow.
find the complete mole ratio of:
2IrCl3(aq) + 3NaOH(aq) → Ir2O3(s) + 3HCl(aq) + 3NaCl(aq)
Answers
The balanced chemical equation for the given reaction is: 2IrCl3(aq) + 3NaOH(aq) → Ir2O3(s) + 3HCl(aq) + 3NaCl(aq)
How is the mole to mole ratio calculated?Use the atomic masses to translate each element's mass into moles. By dividing the total number of moles by the smallest number of moles, you may determine the ratio or the number of moles of each element.
The mole ratio of the reactants and products are represented by the coefficients in a balanced chemical equation. Hence, the total mole ratio for the indicated reaction is:
2 moles of IrCl3 : 3 moles of NaOH : 1 mole of Ir2O3 : 3 moles of HCl : 3 moles of NaCl
This can also be expressed in simpler terms as:
2:3:1:3:3
As a result, 3 moles of NaOH are needed to completely react with every 2 moles of IrCl3. 3 moles of HCl, 3 moles of NaCl, and 1 mole of Ir2O3 are the end products.
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Magnesium unites completely and vigorously with oxygen to form magnesium oxide, which contains 60% magnesium by weight. If 1.00 gram of magnesium is sealed in a glass tube with 1.00 gram of oxygen, what will be present in the tube after the reaction has taken place
Answers
Answer:
After the reaction, there will 0.60 g of magnesium oxide and 0.25 g of oxygen gas present in the tube
Explanation:
Equation of the reaction between magnesium and oxygen is given as follows:
2Mg(s) + O₂(g) ---> 2MgO(s)
From the equation of reaction, 2 moles of magnesium reacts with i mole of oxygen gas to produce 1 mole of magnesium oxide
molar mass of magnesium is 24.0 g; molar mass of oxygen gas = 32.0 g; molar mass of magnesium oxide = 40.0 g
Therefore 24 g of magnesium reacts with 32 g of oxygen gas
I.00 g of magnesium will react with (24.0 / 32.0) * 1.00 g of oxygen = 0.75 g of oxygen gas.
Therefore, magnesium is the limiting reagent. Once it is used up, the reaction will stop and the excess oxygen will be left in the tube together with the product, magnesium oxide.
mass of excess oxygen = 1.00 - 0.75 = 0.25 g
mass of magnesium oxide formed = (24.0 / 40.0 g) * 1 = 0.60 g
An organism is unicellular, reproduces asexually, and lives in a hot hydrothermal vent at the bottom of the ocean. This organism most likely belongs to the kingdom
Answers
Identify which of the following is NOT a chlorine "reservoir" molecule. HCl Cl
2
ClONO
2
ClO
Answers
The molecule ClO is not a chlorine "reservoir" molecule.
Chlorine "reservoir" molecules are compounds that can act as a source or storage of chlorine atoms. These molecules release chlorine atoms into the atmosphere, where they can participate in chemical reactions, particularly in ozone depletion processes.
Let's elaborate on each of the given molecules to identify which one is not a chlorine "reservoir" molecule:
1. HCl (hydrochloric acid): HCl is a molecule consisting of one hydrogen atom (H) and one chlorine atom (Cl). While it contains chlorine, it is not considered a chlorine "reservoir" molecule. HCl is a highly soluble gas in water and does not readily release chlorine atoms into the atmosphere.
2. Cl2 (chlorine gas): Cl2 is a diatomic molecule composed of two chlorine atoms bonded together. Chlorine gas is an important chlorine "reservoir" molecule as it can undergo photodissociation in the presence of ultraviolet (UV) radiation, releasing individual chlorine atoms (Cl). These released chlorine atoms can participate in ozone-depleting reactions.
3. ClONO2 (chlorine nitrate): ClONO2 is a molecule formed from the reaction between ClO and NO2 in the atmosphere. It is considered a chlorine "reservoir" molecule because it can release chlorine atoms through photolysis, a process that occurs when ClONO2 absorbs UV radiation. The released chlorine atoms can then participate in ozone destruction.
4. ClO (chlorine monoxide): ClO is a diatomic molecule composed of one chlorine atom and one oxygen atom. Unlike the other options, ClO is not considered a chlorine "reservoir" molecule. It acts as an intermediate in the catalytic destruction of ozone in the stratosphere. ClO reacts with ozone (O3) to form Cl2 and oxygen (O2), which in turn can release more chlorine atoms upon UV photolysis.
Therefore, ClO is the molecule that is not considered a chlorine "reservoir" molecule, as it does not directly release chlorine atoms into the atmosphere.
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When the reaction between zinc and hydrochloric acid is complete, _____ is the free element
Answers
Answer:
Hydrogen Gas is the free element
Fill in the blanks
The _____________ _____________ is the atomic mass rounded to a whole number.
Answers
The mass number is the atomic mass rounded to a whole number.
What is mass number?The mass number, can be regarded as the atomic mass number or nucleon number, which can be seen as the total number of protons as well as neutrons in an atomic nucleus however if it is approximated , it can be considered to be equal to the atomic mass of the atom expressed in atomic mass units.
It should be noted that the mass number is established by rounding the atomic weight to the nearest whole number.
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10 ejemplos de disoluciones identificando el soluto y el solvente y el tipo de disolucion que corresponde
Answers
Answer:
iqjapsgvöaöqpwüsbwjwj
The movement of tectonic plates in two locations is described below:
Location A: Tectonic plates collide and one plate moves over the other while the other plate is pushed deep into the mantle
Location B: Tectonic plates slide past each other
Which statement is most likely correct?
Group of answer choices
Mountains may form in Location B but not in Location A.
There is no chance of earthquakes in the two locations.
Volcanic eruptions may occur in both locations.
Subduction happens in Location A but not in Location B.
Answers
Answer:
It is b
Explanation:
Because the mountain comes up not down
Which of these compounds is oxidized by a multienzyme complex that requires five different coenzymes?
Alpha-ketoglutarate
Isocitrate
Acetyl CoA
Succinyl CoA
Oxaloacetate
Answers
The compound that is oxidized by a multienzyme complex requiring five different coenzymes is A)Isocitrate.
This occurs in the isocitrate dehydrogenase step of the citric acid cycle (also known as the Krebs cycle or TCA cycle), where isocitrate is converted into alpha-ketoglutarate.
The TCA (tricarboxylic acid) cycle, also known as the Krebs cycle or the citric acid cycle, is a series of biochemical reactions that occur in the mitochondria of eukaryotic cells and in the cytoplasm of prokaryotic cells. It is the central metabolic pathway that links the metabolism of carbohydrates, fats, and proteins.
The TCA cycle generates high-energy molecules in the form of NADH, FADH2, GTP or ATP, which are used by the electron transport chain to produce ATP through oxidative phosphorylation. The TCA cycle also plays a critical role in the biosynthesis of amino acids, lipids, and other important metabolites.
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an item containing an element with exactly 79 protons. explain why your chosen object fits this description.
Answers
The element with 79 protons is Gold (Au). The items that contain gold and hence fulfill the given description include jewelry, coins, and other precious metal items, and electronic devices.
The item containing an element with exactly 79 protons is gold. Gold is a chemical element with the symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. The chemical symbol Au is derived from the Latin word for gold, aurum. Hence, gold items such as jewelry, coins, and other precious metal items, and electronic devices fit this description. Gold is a precious metal that is widely used in jewelry and other decorative items due to its unique color, luster, and malleability. It is also used in a wide range of electronic devices, such as mobile phones and computers, due to its excellent conductivity and corrosion resistance. Gold is a highly valued metal that has been prized by humans for centuries due to its beauty and rarity. It is one of the few elements that is found in its pure form in nature, and its scarcity has made it a symbol of wealth and status in many cultures around the world. Gold is also used in a wide range of industrial applications, including the production of electronics, medical devices, and aerospace components. Its unique properties, such as its high ductility and resistance to corrosion, make it an ideal material for these applications.
An item containing an element with exactly 79 protons is gold. Gold is a precious metal that is widely used in jewelry, coins, and other precious metal items, and electronic devices. It is highly valued for its unique color, luster, and malleability, and is also used in a wide range of industrial applications due to its excellent conductivity and corrosion resistance.
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pls check for me !! thank you.
Answers
Answer:
52 mL of H₂O.
Explanation:
The balanced equation for the reaction is given below:
2H₂ + O₂ —> 2H₂O
From the balanced equation above,
2 mL of H₂ reacted with 1 mL of O₂ to produce 2 mL of H₂O.
Finally, we shall determine the volume of H₂O that will be produced by the reaction of 52 mL of H₂ at the same temperature and pressure.
This can be obtained as follow:
From the balanced equation above,
2 mL of H₂ reacted to produce 2 mL of H₂O.
Therefore, 52 mL of H₂ will also react to produce 52 mL of H₂O.
Thus, 52 mL of H₂O were obtained from the reaction.
If 60 g of a radioactive substance naturally decays to 15 g after 16 hours, what is the half-life of the radioisotope?.
Answers
A radioactive source's half-life is 8 hours if 60 g of it drops voluntarily to 15 g in 16 hours.
What are radioisotopes, and how are their radioactivity levels determined?
The number of protons in the atomic nuclei of the constituent atoms of a given chemical is constant, whereas the number of neutrons changes. Radioisotopes are the name for an element's radioactive constituents. They can also be referred to as unstable neutron-proton pairings or atoms with too much electrical energy in their nucleus. The Contributes to the continuing (Bq), the international unit, or the Cobalt (Ci), the official machine in the United States, are used to report actual radiation levels.
Complete life divided by half.
Half-life equals 16/2
8 hours is the half-life.
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Lana drew the diagram below to model asexual reproduction. Based on Lana's diagram, which statement explains the results of asexual reproduction? A. The offspring are not genetically identical to the parent, because each offspring receives only half of the chromosomes from a single parent. B. The offspring are not genetically identical to the parents, because two parents each contribute half of their chromosomes to each offspring. C. The offspring are genetically identical to the parent, because each offspring receives a complete copy of a single parent's chromosomes. D. The offspring are genetically identical to the parents, because two parents each contribute a complete copy of their chromosomes to each offspring.
Answers
Based on Lana's diagram, the correct statement that explains the results of asexual reproduction is C. The offspring are genetically identical to the parent, because each offspring receives a complete copy of a single parent's chromosomes.
What happens in asexual reproduction?In the diagram, the parent cell divides into two identical daughter cells, each of which contains a complete copy of the parent cell's genetic material.
This type of reproduction, where a single parent produces offspring that are genetically identical to itself, is called asexual reproduction. It is the process by which many unicellular organisms, such as bacteria and some protists, reproduce.
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Given that there are more possible combinations for amino acids than amino acids themselves, what does this imply about the number of codes for each amino acid?
Answers
The fact that there are more possible combinations for amino acids than the number of amino acids themselves implies that each amino acid can be encoded by multiple codons.
A codon is a sequence of three nucleotides in DNA or RNA that corresponds to a specific amino acid.
There are 20 standard amino acids used to build proteins in living organisms. However, there are 64 possible three-letter combinations of nucleotides (4³) that can be used to form codons. This means that on average, there are more than three codons that can encode each amino acid.
To calculate the number of codons per amino acid on average, we divide the total number of codons (64) by the number of amino acids (20). Therefore, the average number of codons per amino acid is 64/20 = 3.2.
This indicates that there is a degeneracy or redundancy in the genetic code, where multiple codons can specify the same amino acid.
For example, the amino acid leucine is encoded by six different codons (UUA, UUG, CUU, CUC, CUA, CUG), while methionine and tryptophan are each encoded by a single codon.
In conclusion, the existence of more possible combinations for amino acids than amino acids themselves means that the genetic code is degenerate, allowing for redundancy and flexibility in protein synthesis.
This redundancy helps to protect against errors in DNA replication and transcription and allows for evolution to occur through the accumulation of genetic variations.
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A 4.24 kg marble slab has the volume of 1564 cm3 What is the density in g/cm3
Answers
Answer:
The answer is
2.71 g/cm³Explanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\\)
From the question
volume of marble = 1564 cm³
1 kg = 1000 g
4.24 kg = 4240 g
mass = 4240 g
The density is
\(density = \frac{4240}{1564} \\ = 2.710997442...\)
We have the final answer as
2.71 g/cm³Hope this helps you
What is a covalent bond definition?
Answers
What is the molarity of a solution if there are 160.0 g of h2so4 in a 0.500 l solution?
Answers
The molarity of the solution is 0.32 M
Calculation,
Molarity of the solution is the total number of moles present in volume in liter.
molarity = number of moles/volume in liter = n/V ...(i)
Number of moles of sulfuric acid = given mass/molar mass
Number of moles of sulfuric acid (n) = 16g/98.079g/mol = 0.16 mole
Volume of the solution (V) = 0.5 L
Putting the value of volume and number of moles in equation (i) we get,
molarity = 0.16 mol/0.5 L = 0.32 mol/L = 0.32 M
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Consider the following chemical reaction: 3 MgCl2 + 2 Na3PO4 6 NaCl + Mg3(PO4)2. Assume that 0.75 mol of MgCl2 and 0.65 mol of Na3PO4 are placed in a reaction vessel.
a) Verify that Na3PO4 is the excess reactant and MgCl2 is the limiting reactant.
b) How many moles of the excess reactant are left over after the reaction stops?
c) How many moles of NaCl will be produced in this reaction? (Remember—you must base this answer on how many moles of the limiting reactant that reacted.)
Answers
Answer:
To determine the limiting reactant and the excess reactant, we need to compare the stoichiometry of the reaction with the amounts of each reactant given.
The balanced chemical equation is:
3 MgCl2 + 2 Na3PO4 -> 6 NaCl + Mg3(PO4)2
Given:
Moles of MgCl2 = 0.75 mol
Moles of Na3PO4 = 0.65 mol
a) To verify the limiting reactant, we need to calculate the moles of Na3PO4 and MgCl2 needed to react completely, based on the stoichiometry of the balanced equation.
From the equation, we can see that:
For every 3 moles of MgCl2, 2 moles of Na3PO4 are required.
Therefore, the moles of Na3PO4 required to react with 0.75 mol of MgCl2 would be:
(0.75 mol MgCl2) x (2 mol Na3PO4 / 3 mol MgCl2) = 0.5 mol Na3PO4
Since we have 0.65 mol of Na3PO4, which is greater than the required amount of 0.5 mol, Na3PO4 is the excess reactant.
b) To find the moles of the excess reactant left over, we subtract the moles of Na3PO4 that reacted from the initial moles:
0.65 mol Na3PO4 - 0.5 mol Na3PO4 = 0.15 mol Na3PO4 (left over)
c) To determine the moles of NaCl produced in the reaction, we need to calculate the moles of the limiting reactant (MgCl2) that reacted. From the balanced equation, we know that:
For every 3 moles of MgCl2, 6 moles of NaCl are produced.
Using the stoichiometry, we can calculate the moles of NaCl produced:
(0.75 mol MgCl2) x (6 mol NaCl / 3 mol MgCl2) = 1.5 mol NaCl
Therefore, 1.5 mol of NaCl will be produced in this reaction.
Calvin goes for a walk outside and begins to sweat. His sweat will not evaporate. What is the most likely cause of this?
D. A wind speed of 40 mph
E. An air temperature of 7 °C or 45 °F
F. A strong northerly wind
G. A relative humidity of 95%
Answers
Answer:D
Explanation:it makes sense alot
Answer: D) A relative humidity of 95%
Explanation:
2. At about what temperature will 37 g of both copper(II) sulfate and potassium chloride disse
in 100 g of water?
Answers
The temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
What is solubility?The solubility of a substance is its ability to be dissolved in water.
Solubility of 37 g of Copper (II) sulfateThe solubility of 37 g of Copper (II) sulfate is determined from the solubility curve of Copper (II) sulfate.
Solubility of 37 g of potassium chlorideThe solubility of 37 g of potassium chloride is determined from the solubility of potassium chloride.
Thus, from the solubility charts, the temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
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Match each term below with its definition or description.
1 The point in a titration when the added amount of standard reagent is equal to the amount of analyte being titrated.
2 The analyte is titrated with the standard reagent and the volume of standard solution required to complete the reaction is measured.
3 A reagent that is pure and stable, which can be used directly after weighing.
4 The analyte that is being analyzed in the titration.
5 Standard reagent is added in excess to ensure complete reaction with the analyte. The excess reagent is then titrated with a second standard reagent.
6 A solution, whose concentration is known, often made from a reagent of known purity.
7 The standard reagent of known concentration that is added from a buret to the analyte solution.
8 The analyte does not react directly with the titrant so it is converted to another form which will react with the titrant.
9 The point in a titration when a change in the analyte solution is observed, indicating equivalency.
10 It is added to the analyte solution and aids in the observation of the completion of the reaction.
a) End Point
b) Indicator
c) Direct Titration
d) Back Titration
e) Indirect Titration
f) Primary Standard
g) Standard Solution
h) Titrand
i) Equivalence Point
j) Titrant
Answers
Answer:
1. Equivalence point
2. Direct titration
3. Primary standard
4. Titrand
5. Back titration
6. Standard solution
7. Titrant
8. Indirect titration
9. End point
10. Indicator
Explanation:
1. The equivalence point is the tiration point at which the quantity or moles of the added titrant is sufficient or equal to the quantity or moles of the analyte for the neutralization of the solution of the analyte.
2. Direct titration is a method of quantitatively determining the contents of a substance
3. A primary standard is an easily weigh-able representative of the mount of moles contained in a substance
4. A titrand is the substance of unknown concentration which is to be determined
5. The titration method that uses a given amount of an excess reagent to determine the concentration of an analyte is known as back titration
6. A standard solution is a solution of accurately known concentration
7. A titrant is a solution that has a known concentration and which is titrated unto another solution to determine the concentration of the second solution
8. Indirect titration is the process of performing a titration in athe reverse order
9. The end point is the point at which the indicator indicates that the equivalent quantities of the reagents required for a complete reaction has been added
10 An indicator is a compound used to visually determine the pH of a solution.
The titration has been the neutralization reaction in which the titrand and the titrant react to form the salt and the water and help in the determination of the qualitative and quantitative properties.
What is an Endpoint?In a titration reaction, the endpoint has been the point at which the equivalent amount of reagent has been completely neutralized.The Indicator has been the chemical that changes to indicate the endpoint of the reaction.Direct titration involves the reaction for the quantitative determination of the substances.The back titration can be given as the reaction in which the excess reagent is used to titrate the second standard reagent in the reaction.Indirect titration can be given as the reaction of the analyte to convert to another form and then the analysis with the titrant.The primary standard has been the known concentration of the pure and stable weighing reagent.The standard solution has been the solution of the known concentration in the reaction.Titrand has been the unknown sample that has to be analyzed.The equivalence point is the concentration point at which the quantity of titrant added to the titrand has been equal.Titrant has been the known concentration of sample that has been added to equivalent the unknown sample.Learn more about titration here:
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What does the Clean Air Act regulate and protect the public from?
a
Aquatic Lifeforms
b
Wild Life
c
Litter on the streets
d
Bad Air Pollutants
Answers
Which of the following statements about salinity is true?
Question 1 options:
Ocean water near rivers has a lower salinity.
Ocean water near areas with low evaporation has higher salinity.
Ocean water in regions with high levels of precipitation has higher salinity.
Ocean water in areas with high humidity has a higher salinity.
Answers
The statement that is true about salinity is:
Ocean water near rivers has a lower salinity.What is salinity?It is a measure of the amount of salts and minerals dissolved in water and is expressed in grams of salt per kilogram of water or in parts per thousand (ppt).
Characteristics of salinityThe main processes responsible for the distribution of salinity in the ocean are: evaporation, precipitation and mixing.The lowest values of ocean water salinity occur locally near the coasts where large rivers flow, and in polar regions where ice melts.Therefore, we can conclude that salinity varies due to differences in evaporation, precipitation, freezing, and freshwater runoff from the earth at different latitudes and locations.
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What property is the compound SeO likely to
exhibit?
A. acts as a strong electrolyte
B. high electrical conductivity
C. malleable in the solid phase
D. crystalline structure
Answers
The property that the compound SeO is likely to
exhibit is option A. acts as a strong electrolyte.
What is Selenium oxide (SeO)?Selenium oxide (SeO) is a binary compound that contains both a metal (selenium) and a non-metal (oxygen) element. In general, binary compounds consisting of a metal and a non-metal tend to exhibit ionic bonding, which results in the compound acting as a strong electrolyte in solution. This means that the compound dissociates into ions in water and conducts electricity.
Therefore, the correct answer is as given above.It could then be concluded that the property that the compound SeO is likely to exhibit is option A. acts as a strong electrolyte.
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What errors can you come across when reading a thermometer
Answers
Answer:
There are several sources of errors when reading a thermometer. Some common sources include limitations in digital processing and physical issues with the device itself, errors with the sensor which is often the greatest source of error, and measurement error which can depend on the skill of the operator. An “Err” message can also appear on a thermometer’s display if the sensor is too warm before powering on, if the temperature reading is incomplete, or if there is an internal problem with the thermometer.