the half-life of strontium-90 is 28 years. how long will it take a 44 mg sample to decay to a mass of 11 mg?
Answers
To decay 44 mg sample strontium to a mass of 11 mg it will take 56 years. A silvery metal called strontium is a naturally occurring, non-radioactive element.
What is strontium ?The chemical element strontium has the atomic number 38 and the symbol Sr. Strontium is a soft, silver-white, yellowish metallic element that is an alkaline earth metal and has a strong reactivity to chemicals. When the metal is exposed to air, a thick layer of dark oxide forms.
Most people associate strontium with the vivid red colours that its salts give to fireworks and flares. Creating ferrite magnets and purifying zinc are two further uses for it. Strontium aluminate is a component of contemporary polymers and "glow-in-the-dark" paints.
According to studies, taking strontium supplements may help decrease bone pain, boost bone mineral density, and lower the risk of some fractures. More. Both bone formation and bone breakdown may be influenced by strontium.
In 28 years, you will have (1/2)(44)=22 mg left.
After another 28 years, you will have (1/2)(22)=11 mg left.
Total time to 11 mg = 56 years.
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Related Questions
Prepare indicators by using natural materials like extract of red cabbage leaves, crushed beetroot,
coloured petals of flowers such as petunia, onion extract, clove oil and vanilla essence and use these
indicators to find the nature of the various substances. Tabulate your observations
pls answer correctly ASAP
Answers
Answer:
Y
ou have learnt in your previous classes that the sour and bitter
tastes of food are due to acids and bases, respectively, present in them.
If someone in the family is suffering from a problem of acidity after
overeating, which of the following would you suggest as a remedy– lemon
juice, vinegar or baking soda solution?
n Which property did you think of while choosing the remedy?
Surely you must have used your knowledge about the ability of
acids and bases to nullify each other’s effect.
n Recall how we tested sour and bitter substances without tasting
them.
You already know that acids are sour in taste and change the colour
of blue litmus to red, whereas, bases are bitter and change the colour of
the red litmus to blue. Litmus is a natural indicator, turmeric is another
such indicator. Have you noticed that a stain of curry on a white cloth
becomes reddish-brown when soap, which is basic in nature, is scrubbed
on it? It turns yellow again when the cloth is washed with plenty of
water. You can also use synthetic indicators such as methyl orange and
phenolphthalein to test for acids and bases.
In this Chapter, we will study the reactions of acids and bases, how
acids and bases cancel out each other’s effects and many more interesting
things that we use and see in our day-to-day life. Do You Know?
Litmus solution is a purple dye, which is extracted from lichen, a plant belonging to
the division Thallophyta, and is commonly used as an indicator. When the litmus
solution is neither acidic nor basic, its colour is purple. There are many other natural
materials like red cabbage leaves, turmeric, coloured petals of some flowers such as
Hydrangea, Petunia and Geranium, which indicate the presence of acid or base in a
solution. These are called acid-base indicators or sometimes simply indicators.
2021–22
18 Science
2.1 UNDERSTANDING THE CHEMICAL PROPERTIES OF
ACIDS AND BASES
2.1.1 Acids and Bases in the Laboratory
Activity 2.1
These indicators tell us whether a substance is acidic or basic by
change in colour. There are some substances whose odour changes in
acidic or basic media. These are called olfactory indicators. Let us try
out some of these indicators.
Explanation:
Phosphoric acid, HyPO, contains 3.023 g of hydrogen, 30.974 g of phosphorus, and
63.996 g of oxygen. Find the percent composition of phosphorus, hydrogen, and oxygen.
Answers
Answer:
The percent composition of phosphorus, hydrogen, and oxygen in phosphoric acid are approximately 31.6%, 3.08%, and 65.3%.
Explanation:
To find the percent composition of phosphorus, hydrogen, and oxygen in phosphoric acid (H3PO4), we need to first calculate the molar mass of the compound.
Molar mass of H3PO4 = 3(1.008 g/mol) + 30.974 g/mol + 4(15.999 g/mol) = 98.0 g/mol
Next, we can calculate the percent composition of each element as follows:
Percent composition of hydrogen = (3.023 g H / 98.0 g H3PO4) x 100% ≈ 3.08%
Percent composition of phosphorus = (30.974 g P / 98.0 g H3PO4) x 100% ≈ 31.6%
Percent composition of oxygen = (63.996 g O / 98.0 g H3PO4) x 100% ≈ 65.3%
Therefore, the percent composition of phosphorus, hydrogen, and oxygen in phosphoric acid are approximately 31.6%, 3.08%, and 65.3%, respectively.
The first step in the industrial manufacture of sulfuric acid is the complete combustion of sulfur, s 8 (s). what mass of sulfur is required to produce 112 dm 3 of sulfur dioxide at stp?
Answers
To calculate the mass of sulfur required to produce 112 dm^3 of sulfur dioxide (SO2) at standard temperature and pressure (STP), Approximately 20.044 grams of sulfur are required to produce 112 dm^3 of sulfur dioxide at STP.
we need to use the balanced chemical equation for the combustion of sulfur.
The balanced equation for the combustion of sulfur is:
S8 (s) + 8O2 (g) -> 8SO2 (g)
From the equation, we can see that 1 mole of sulfur (S8) reacts to produce 8 moles of sulfur dioxide (SO2).
First, we need to calculate the number of moles of SO2. At STP, 1 mole of any gas occupies 22.4 dm^3. Therefore, 112 dm^3 of SO2 corresponds to 112/22.4 = 5 moles of SO2.
Since the molar ratio between S8 and SO2 is 1:8, we can conclude that the number of moles of sulfur required is 5/8 = 0.625 moles.
To calculate the mass of sulfur, we need to use the molar mass of sulfur (32.07 g/mol). Multiply the number of moles (0.625 moles) by the molar mass of sulfur to get the mass of sulfur required.
Mass of sulfur = 0.625 moles x 32.07 g/mol = 20.044 g
Therefore, approximately 20.044 grams of sulfur is required to produce 112 dm^3 of sulfur dioxide at STP.
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1. What is the average number of breaths per minute for males at rest?
Answers
Answer:
12-16 breaths/minute
Explanation:
why does a new flu shot need to be made each year ?
Answers
because we could be sick if don't get the shot there is a higher chance to have the flu
i hope this helps you!
A reaction A(aq)+B(aq)↽−−⇀C(aq) A ( aq ) + B ( aq ) ↽ − − ⇀ C ( aq ) has a standard free‑energy change of −3. 06 kJ/mol − 3. 06 kJ / mol at 25 °C. 25 °C. What are the concentrations of A, A , B, B , and C C at equilibrium if, at the beginning of the reaction, their concentrations are 0. 30 M, 0. 30 M, 0. 40 M, 0. 40 M, and 0 M, 0 M, respectively?
Answers
At equilibrium, the concentrations of A, B, and C are 0.112 M, 0.212 M, and 0.188 M, respectively.
The standard free-energy change (ΔG°) of reaction is -3.06 kJ/mol, which can be related to equilibrium constant (K) using following equation:
ΔG° = -RTlnK
where R is gas constant (8.314 J/mol·K),
T is temperature in Kelvin (25°C = 298 K), and
ln is natural logarithm.
-3.06 kJ/mol = -8.314 J/mol·K x 298 K x lnK
Solving for lnK:
lnK = -3.06 kJ/mol / (-8.314 J/mol·K x 298 K) = 0.447
Taking, antilogarithm of both sides to solve for K:
K = e^0.447 = 1.563
At equilibrium, concentrations of A, B, and C can be calculated using stoichiometry of the reaction and equilibrium constant expression:
K = [C] / ([A] x [B])
1.563 = [C] / (0.30 M x 0.40 M)
[C] = 0.188 M
Since, stoichiometry of reaction is 1:1:1, [A] and [B] at equilibrium will be:
[A] = [A]0 - [C] = 0.30 M - 0.188 M = 0.112 M
[B] = [B]0 - [C] = 0.40 M - 0.188 M = 0.212 M
Therefore, at equilibrium, the concentrations of A, B, and C are 0.112 M, 0.212 M, and 0.188 M, respectively.
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How would the equilibrium of the reaction below be affected if thetemperature increased?A. The concentrations of O2, SO2, and SO3 would decrease.B. The concentrations of O2, SO2, and SO3 would increase.C. The concentrations of O2 and SO2 would increase.D.The concentration of SO3 would increase.
Answers
Explanation:
Wehn the temperature is increased, a product is added to the equilibrium. Therefore, the equilibrium will shift in an attempth to reduce the products. The equilibrium shifts backwards basically.
Answer:
The correct answer is A.
If 78.2 grams of oxygen (o2) react with plenty of copper cu, how many moles of
copper (ii) oxide (cuo) will be produced?
Answers
78.2 grams of oxygen (O₂) reacted with copper (Cu) to produce copper (II) oxide (CuO). When the oxygen reacts with 4.88 moles of copper, it will produce 9.76 moles of copper oxide (CuO).
The balanced chemical equation for the reaction between oxygen and copper is:
2Cu + O₂ → 2CuO
From the equation, we see that 1 mole of O₂ reacts with 2 moles of Cu to produce 2 moles of CuO.
First, we need to convert the given mass of O₂ to moles:
78.2 g O₂ × (1 mol O₂/32.00 g O₂) = 2.44 mol O₂
According to the stoichiometry of the balanced equation, 2 moles of Cu are required for every 1 mole of O₂ reacted. Therefore, the moles of Cu needed can be calculated as:
2.44 mol O₂ × (2 mol Cu/1 mol O₂) = 4.88 mol Cu
So, 4.88 moles of Cu will react with 78.2 grams of O₂ to produce 9.76 moles of CuO.
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Rx Ephedrine sulfate (fz. pt = -0.13°C). 2%
Sodium chloride MW 58.5
Purified water qs ad. 30 mL
How much sodium chloride should be used to make this eye
solution isotonic with tears?
the answer is 22
Answers
The correct answer is the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.
The given solution is a hypotonic solution as the solution's tonicity is lower than that of the tears. The tears contain 0.9% w/v of NaCl, which is isotonic with tears. So, to make the given solution isotonic, the amount of sodium chloride needs to be added.
The concentration of NaCl in tears is 0.9% w/v. Additional Information: We know that % w/v is the amount of solute present in grams per 100 ml of the solution. Therefore, 0.9% w/v means 0.9 grams of NaCl is present in 100 mL of tears.
To make 30 ml of isotonic solution, we can use the following formula: Equivalent weight of NaCl = 58.5/2 = 29.25 (as NaCl ionizes to give Na+ and Cl- ions)Moles of NaCl required to make 30 ml isotonic solution = 0.9 × 30 / 1000 = 0.027Moles of Na+ and Cl- ions present in 30 mL of isotonic solution = 2 × 0.027 = 0.054
A number of grams of NaCl needed to prepare 30 mL of isotonic solution is calculated as follows:0.054 g = (0.027 x 29.25 x X) / 1000Where X is the amount of NaCl required to make 30 mL isotonic solution. Solving this equation gives us: X = 1.85 g (approx). Therefore, the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.
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List 1 advantage and 1 disadvantage of a series circuit.
Please help!!!
Answers
Answer:
The advantage is that, you can add additional power devices usually using batteries.The disadvantage is ... if one component in a series circuit fails, then all the components in the circuit fail because the circuit has been broken.HELP PLEASE PLEAE PLEASEEEEE BRAINLIEST
Answers
In the claim, "Caterpillars can digest chlorophyll because they can get plants," No revision needed, this is a good claim because it answers the question, "Can caterpillars digest chlorophyll?"
What makes a good claim to a question?A good claim to a question is one that is clear, concise, and supported by evidence. It should state a position or argument in response to the question and be specific and focused.
Correct claims have the following characteristics:
It answers the question.It is only one sentenceIt is written as a factIt does not include an I/We/TheyIt only answers the questionIt has reasoningIt is a complete sentenceLearn more on claims here: https://brainly.com/question/2748145
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Cast iron is a popular metal for several cooking needs, both vegetables and meats across culinary traditions. One material science question that engineers designing more efficient cookware might ask is how to ensure an optimal, balanced heat transfer. In order to see what they are trying to improve upon,
consider a pan that has a thickness of 0.125 inches and a radius of 5 inches. What is the heat transfer rate for each increase in 1 degree Celsius?
Note that the heat transfer rate Q is found by using the material’s thermal conductance (W/ mK or BTU / s-ft -°F) k, the area of the surface the heat flows through A, the thickness of the material L, and the temperature difference ∆.
Q=kA( ∆/L)
Answers
The heat transfer rate for each degree Celsius rise is 32656 J.
Do you define the term heat transfer coefficient?Heat is transferred between materials in direct physical contact through a process called conduction that involves molecular collisions. A material's thermal conductivity, cross-sectional area, and temperature differential are all directly related to its heat transfer rate. Varies inversely with material thickness. To the question asked:
The heat transfer coefficient Q is:
Q=kA(ΔT/L)
among them,
k = thermal conductivity of material - 52 (W/m K)
Area of the surface of heat flow A:
A = πr²
= 3.14*5*5
A = 78.5 square inches
Temperature difference ΔT = 1 degree Celsius.
Material thickness L = 0.125 inch
set the value.
Q=kA(ΔT/L)
Q = 52*78.5 (1/0.125)
Q = 32656 J
Therefore, the heat transfer coefficient is 32656 J for each degree Celsius increase.
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With every increase in degree Celsius, there is a 32656 J heat transfer cofficient.
What does the term "heat transfer coefficient" means?Via a process called conduction, which involves molecular collisions, heat is transported between materials that are in direct physical touch. The rate of heat transmission through a material depends on its thermal conductivity, cross-sectional area, and temperature differential. inversely relates to material thickness. To the query posed:
The heat transfer coefficient Q is:
Q=kA(ΔT/L)
According to the given data:k = the thermal conductivity of material - 52 (W/m K)
Area of the surface of heat flow A:
A = πr²
= 3.14*5*5
A = 78.5 square inches
Temperature difference ΔT = 1 degree Celsius.
Material thickness L = 0.125 inch
set the value.
Q=kA(ΔT/L)
Q = 52*78.5 (1/0.125)
Q = 32656 J
Therefore, the heat transfer coefficient is 32656 J for each degree Celsius increase.
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As the reaction in a galvanic cell proceeds towards products, which of the following are true?
A) ΔG starts at 0, stays same
B) ΔG starts < 0, becomes more negative
C) ΔG starts < 0, stays same
D) ΔG starts < 0, becomes more positive
E) ΔG starts > 0, stays same
Answers
In a galvanic cell, the reaction proceeds towards the production of products. ΔG starts < 0, becomes more negative
Option B is correct .
As the reaction proceeds, the Gibbs free energy (ΔG) reduces, and the following are true: ΔG starts < 0, becomes more negative.
When the reaction in a galvanic cell proceeds towards the production of products, the Gibbs free energy starts with a negative value, and it becomes even more negative.
The Gibbs free energy (ΔG) is a measure of the available energy in a system that can be used to do work. It measures the difference between the free energy of the final state and the initial state.The Gibbs free energy change of a system is dependent on the enthalpy and entropy change. If the enthalpy change is negative (exothermic), and the entropy change is positive (disorderly), the Gibbs free energy change is negative, and the reaction is spontaneous.
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what is the ph of 1.00 l of rainwater that has dissolved 4.18 mg of no2 ? assume that all of the no2 has reacted with water to give nitric acid.
Answers
The pH of the solution is 1.954. The pH scale ranges from 0 to 14, with 7 being neutral.
The pH of a solution is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in the solution. Since HNO3 is a strong acid, it is almost completely dissociated in water, so the concentration of H+ ions in the solution is equal to the concentration of HNO3.
We first need to determine the concentration of nitric acid (HNO3) that has formed from the reaction of NO2 with water.
The molar mass of NO2 is 46.006 g/mol, so the number of moles of NO2 dissolved in 1.00 L of water is
4.18 mg / 46.006 g/mol = 0.0910 mol.
Since the reaction between NO2 and water is:
NO2 (aq) + H2O(l) → HNO3 (aq) + NO(g)
The number of moles of HNO3 formed is equal to the number of moles of NO2 present, which is 0.0910 mol.
So, the concentration of HNO3 is 0.0910 mol / 1.00 L = 0.0910 M.
pH = -log(0.0910) =1.954
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A carbon-carbon double bond is ______ than a carbon-carbon triple bond, and ______ than a carbon-carbon single bond.
Answers
Answer:
longer, shorter
Explanation:
A carbon-carbon double bond is longer than a carbon-carbon triple bond, and shorter than a carbon-carbon single bond
Please help, 50 points!! What is the name of the compound CaF4?
Answers
Answer:
The answer is Calcium Fluoride
what food has monosaccharides starches but no proteins or lipids
Answers
Answer:
Pasta contains all of these different carbohydrates in varying proportions.
Explanation:
How many moon phases will we view in one week?
1
2
3
4
Answers
Answer:
4
Explanation:
Suppose an astronomer discovers a large, spherical-shaped body orbiting the Sun. The body is composed mostly of rock, and there are no other bodies sharing its orbit.
Answers
Answer:
The answer is "Comet".
Explanation:
The comets were interstellar frozen gas of snowballs, stone, and debris orbiting the sun, which are also the size of average towns while frozen. As even the orbit of the comet passes near the sun, it warms up and spreads dust and gas into a big floating head greater than most stars.
It is very important because they are primitive items left out from the galaxy creation. They were one of the first solid materials throughout the solar nebula, its collapsing interstellar-like cloud of dust and gas, which established the heat and planets.Answer: A Planet
Explanation:
The International Astronomical Union defines a planet as a spherical object that orbits a star. Planets clear the neighborhood around their orbits (i.e., no other bodies share their orbits).
Solution of 0. 10 M silver nitrate, AgNO3, is added to a solution of 0. 10 M lithium hydroxide, LiOH. The Ksp of silver hydroxide is 2. 0 x 10-8. What happens to the pH as the silver nitrate is added, AgNO3
Answers
The pH remains unchanged as silver nitrate is added because the reaction between silver nitrate and lithium hydroxide does not involve the release or consumption of protons (H+ ions).
When silver nitrate (AgNO3) is added to lithium hydroxide (LiOH), a precipitation reaction occurs, forming silver hydroxide (AgOH) and lithium nitrate (LiNO3). The balanced equation for the reaction is:
2AgNO3 + 2LiOH -> Ag2OH + 2LiNO3
Since the Ksp (solubility product constant) of silver hydroxide is given as 2.0 x 10^-8, it indicates that silver hydroxide is only slightly soluble in water. As a result, most of the silver hydroxide formed will precipitate out of solution.
The pH of a solution is determined by the concentration of H+ ions. In this reaction, there is no consumption or production of H+ ions. Lithium hydroxide is a strong base that completely dissociates in water, but it does not affect the pH significantly as the concentration is low (0.10 M). Silver nitrate is a neutral salt, so it also does not contribute to any pH changes.
Therefore, the addition of silver nitrate does not have any significant impact on the pH of the solution. The pH remains unchanged throughout the reaction.
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Indicate whether each statement is true or false: a. Substitutional alloys tend to be more ductile than interstitial alloys. b. Interstitial alloys tend to form between elements with similar ionic radii. c. Nonmetallic elements are never found in alloys.
Answers
Answer:
Substitutional alloys tend to be more ductile than interstitial alloys. true
Interstitial alloys tend to form between elements with similar ionic radii.false
Nonmetallic elements are never found in alloys. false
Explanation:
Substitutional alloys consists components having similar atomic(ionic) radii as well as common bonding characteristics. In interstitial alloys, atoms in interstitial positions must have a much smaller covalent radius than the solvent atoms. Interstitial atoms are generally less ductile than substitutional alloys.
Nonmetals are found in alloys. For instance, carbon is a component of the common alloy called steel.
oxides of active metals, such as cao, react with water to form?
Answers
Active metals, such as calcium oxide (CaO), react with water to form an oxide-water reaction.
This reaction produces an alkaline solution, which has a pH higher than 7. As a result, the water will become less acidic, and the oxide will be converted into its hydrated form.
This reaction is an important part of the water treatment process, since it helps to reduce the acidity of water and make it safer for drinking.
Additionally, the alkaline solution produced by the reaction can be used to neutralize acidic materials, making it useful for a variety of industrial and environmental applications.
Active metals such as calcium oxide (CaO) are capable of reacting with water to form oxides.
The reaction between the oxides and water can be used in a variety of different applications, such as to create materials with high strength and durability, or to generate power through the combustion of the oxides.
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What must a scientist do in order to develop a testable hypothesis?
O A. Be certain that the data collected will fully support the hypothesis.
B. Find out whether the hypothesis can also explain untestable
claims.
C. Make sure that no other scientist has investigated the topic
before.
O D. Determine whether it is possible to gather the necessary data.
Answers
Answer:
A
Explanation:
Be certain that the data collected will fully support the hypothesis
Answer: D. Determine whether it is possible to gather the necessary data.
how many off-diagonal peaks are found for a 2d 1h cosy nmr spectrum of threonine? group of answer choices a. 0 b. 1 c. 2 d. 8
Answers
In a 2D 1H COSY NMR spectrum of threonine, you would find 2 off-diagonal peaks. So, the correct answer is c. 2.
In a 2D NMR spectrum, the diagonal peaks correspond to the correlation of each proton with itself, and therefore, they are not informative for structure elucidation. On the other hand, the off-diagonal peaks correspond to correlations between different protons and provide valuable information on the connectivity of the molecule.
The long answer to your question is that the number of off-diagonal peaks found for a 2D 1H COSY NMR spectrum of threonine will depend on the number of coupled protons in the molecule. Threonine contains four coupled protons, two of which are adjacent to each other in the molecule. This means that there will be two off-diagonal peaks observed in the COSY spectrum, corresponding to the coupling between these two pairs of protons. Therefore, the correct answer to your question is c. 2.
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Look at the image below:
Pain Reyne
Ben Francia
Les Trans
01 Juan Bautista
Pents
SAN
PEAS FAULT
NORTH AMERICAN PLATE
CIRC PLATE
Carina
What type of plate boundary is shown here?
O convergent
divergent
transform
Answers
Answer:
Transform
see image below:
the liquid dispensed from a burette is called ___________. select one: solute water titrant analyte
Answers
The liquid dispensed from a burette is called titrant. What is burette? A burette is a laboratory equipment used in analytical chemistry to dispense volumes of liquid precisely and accurately. A burette is used to deliver a variable, measured amount of liquid, and it is calibrated to enable a scientist to determine the volume of liquid it contains to an accurate level. What is titrant? Titrant is a liquid substance with a known concentration. Titrant is used in analytical chemistry to determine the concentration of an analyte (a chemical species under analysis). The amount of titrant required to react with a particular quantity of analyte is measured, and the concentration of the analyte is calculated from this titration.
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]
Consider the following intermediate chemical equations.
C(s) +
CO(g) +
O₂(g) → CO(g)
How will oxygen appear in the final chemical equation?
O O2(g) as a product
O O2(g) as a reactant
OO(g) as a product
O 20(g) as a reactant
O₂(g) → CO₂(g)
Answers
In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).
What is a chemical equation?A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
According to this question, an intermediate chemical equation is presented as follows:
CO(g) + O₂(g) → CO(g)C(s) + O₂(g) → CO₂(g)As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.
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If an atmosphere consisting of an ideal gas were indeed homogeneous (constant density) all the way to the top at z = H, find the temperature at that top. Could such an atmosphere actually exist, even in principle? Why or why not?
Answers
The temperature at the top of an atmosphere consisting of an ideal gas with constant density can be found using the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
Assuming the density of the gas is constant throughout the atmosphere, we can express the pressure as P = ρgh, where ρ is the density, g is the acceleration due to gravity, and h is the height.
Since the atmosphere is homogeneous, the pressure at the top (P_top) is the same as the pressure at the bottom (P_bottom), so we have P_top = P_bottom = ρgh.
Using the ideal gas law, we can write ρghV = nRT, where V is the volume of the gas.
Assuming the volume of the gas is constant, we can cancel out V, and rearranging the equation, we get T_top = (nRT_bottom)/(nR) = T_bottom.
Therefore, the temperature at the top of the atmosphere would be the same as the temperature at the bottom.
In practice, however, it is not possible for an atmosphere to have constant density all the way to the top. As we go higher in the atmosphere, the density decreases due to decreasing pressure and temperature. This is because gravity becomes weaker at higher altitudes. Therefore, in reality, the temperature would decrease as we move higher in the atmosphere.
So, while a homogeneous atmosphere with constant density all the way to the top cannot exist in practice, it can be considered as an idealized scenario for understanding certain aspects of atmospheric behavior.
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This column of the periodic table represents the halogen family. This is a family of reactive elements. Compare
and contrast how the elements are similar and different.
A)
The mass numbers differ; they have the same number of protons
and valence electrons.
B)
They have different atomic numbers and mass numbers; they
have the same number of electrons.
C)
They have different atomic numbers and mass numbers, they
have the same number of valence electrons.
D)
They have different numbers of protons, neutrons, and valence
electrons: they are all gases at room temperature.
Answers
Answer:
C
Explanation:
I took it on usatestprep
What is an ion? What are the two ways in which an ion can be made?