9. Arrange the following ions in terms of increasing atomic radius (arrange then increasing from left [smallest] to right [largest]): Ca2+, K+, Rb+, Sr2+, Na+
Answers
The ions arranged in terms of increasing atomic radius from left to right are: Ca²⁺, Sr²⁺, Na⁺, K⁺, Rb⁺.
As we move from left to right across the periodic table, due to the increasing nuclear charge the number of protons in the nucleus increases, pulling the electrons closer to the center and decreasing the atomic radius. However, as you move down a group, the number of electron shells increases, which increases the distance between the nucleus and outermost electrons, increasing the atomic radius.
Cations (positively charged ions) have smaller radii than their corresponding neutral atoms due to the loss of electrons and increased effective nuclear charge. Ca²⁺, Sr²⁺ have a +2 charge and; K⁺, Rb⁺, and Na⁺ have a +1 charge. Higher charge leads to a smaller atomic radius.
Ca²⁺, Sr²⁺ are located in Group 2, while K⁺, Rb⁺, and Na⁺ are located in Group 1 of periodic table. Arrange the ions based on their positions in the periodic table and their charges.
Based on these factors, the correct order of ions in terms of increasing atomic radius is: Ca²⁺ (smallest), Sr²⁺, Na⁺, K⁺, and Rb⁺ (largest).
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Related Questions
What substances are produced when an acid reacts with base?
Answers
Answer:
Salt and water is produced.
For example:-
NaOH(base)+HCl(Acid)=>NaCl(salt)+H20(water)
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What happens to energy when light is transmitted through or reflected off a material?
Answers
In which cases it’s energy is converted into heat
Answer:
When light hits a material, three different things can happen.
First, the material can absorb the energy.
Second, transmit the energy
Third, reflect the energy cause it to bounce off.
All these things can happen at once.
What set of reaction conditions would favor an sn2 reaction on 2-bromo-3-methylbutane?
Answers
The set of reaction conditions would favor a sn2 reaction on 2-bromo-3-methylbutane is a strong nucleophile in an aprotic solvent. The correct option is D.
What is Sn2 reactions?It is a type of nucleophilic substitution reaction. This mechanism is common in organic chemistry. In these reactions, one bond is break and one bond is formed simultaneously.
The sn2 is a nucleophile reaction, and it is a strong nucleophile. This type of reaction, will occur in the compounds in which there is one alkyl halide group and a good leaving group.
In 2-bromo-3-methylbutane, there is a bromine and methyl group both, so the favor would be a strong nucleophile in an aprotic solvent.
Thus, the correct option is D) strong nucleophile in an aprotic solvent.
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The question is incomplete. Your complete question is given below:
A) weak nucleophile in a protic solvent
B) weak nucleophile in an aprotic solvent
C) strong nucleophile in a protic solvent
D) strong nucleophile in an aprotic solvent
E) none of the above
find the concentration of barium hydroxide using titration data trial
Answers
We can calculate the molarity by dividing the quantity of barium hydroxide in moles by the volume of the initial solution.
How do you find the hydroxide concentration?Implement the titration formula.The formula is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base when the titrant and analyte have a mole ratio of 1:1.The concentration of a solution, measured in moles of solute per liter of solution, is known as its molarity.After dissociation, the concentration of barium hydroxide will be half that of the hydroxide ions because barium hydroxide dissociates into its ions when dissolved in water as:A barium hydroxide solution with a pH of 12.22 therefore has a concentration of 8.29 10 3 M.To learn more about hydroxide concentration refer
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Why is it important for scientists to replicate each other’s experiments?
Answers
On US Interstate system, the maximum speed is 121km/h. How far will you travel if you
maintained this speed for 3 hours and 20 minutes?
Answers
The distance that will be traveled by me on the US interstate system will be 403.3 km.
What is distance?Distance is the total length between two points. Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.
To calculate the distance traveled;
d = Vt
Where;
d = Distance traveled by me
V = Maximum speed
t = Time
Given:
V = 121 km/h
t = 3 hours 20 minute = 10/3 hours
Substituting the values in the formula
d = 121×10/3
d = 403.3 km
In conclusion, the distance traveled by me will be 403.3 km.
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For each illustration below, identify the beginning state of matter,phase change that is happening, and the ending state of matter. • Beginning state of matter• Phase change type • Ending state of matter
Answers
The first one appear to be a pan with some liquid heating up.
The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.
The second one seems to be a ice cube melting.
Its beginning phase is solid, the phase change type is fusion, and its ending state is liquid.
The third one is water, or other liquid, making clouds.
The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.
The fourth illustration seems to be an aluminium can. There aren't really a phase change happening, but when we open the aluminium can containing gaseous drink, there are molecules of gas diluted into the liquid and some of it encouter each other to make a bubble of the gas and is released. It is not an actually phase change, it is the reverse process of diluting gas into liquid. Initially it is diluted gas, it gets released and in the end it is in gas phase.
What is the total amount of heat required to completely vaporize a 100.0 g of
water at its normal boiling point?
Work too pls !!
Answers
The total amount of heat : 225.704 kJ
Further explanationHeat of vaporization(ΔH vap) : heat needed to vaporize 1 mole of water , units : kJ/mol
For water at boiling point (100 °C) : ΔH vap = 40.66 kj/mol
mole of 100 g water :
\(\tt \dfrac{100}{18.015}=5.551\)
so total Heat :
\(\tt 40.66\times 5.551=225.704~kJ\)
What is the movement of air parallel to Earth's surface called?
A. the Coriolis effect
B. windchill
C. wind
D.air pressure
Answers
Answer:
Wind is the movement of air parallel to Earth's surface.
For the balanced equation shown below, how many grams of Na2S will be
produced from 24 grams of C? Na2SO4 + 2C- Na2S + 2CO2
Answers
The given chemical equation is,Na2SO4 + 2C → Na2S + 2CO2To determine the amount of Na2S produced from 24 grams of C, we need to use stoichiometry.
Using stoichiometry, we can calculate the number of moles of C that will react with Na2SO4 and produce Na2S.From the equation, we can see that 2 moles of C react with 1 mole of Na2SO4 to produce 1 mole of Na2S.So, the number of moles of C can be calculated as follows:Number of moles of C = Mass of C / Molar mass of CNumber of moles of C = 24 g / 12.01 g/mole Number of moles of C = 1.998 moles Now, using the stoichiometry, we can calculate the number of moles of Na2S that will be produced from 1.998 moles of C.
Number of moles of Na2S = Number of moles of C x (1 mole of Na2S / 2 moles of C)Number of moles of Na2S = 1.998 x (1 / 2)Number of moles of Na2S = 0.999 molesFinally, we can calculate the mass of Na2S produced from 24 grams of C.Mass of Na2S = Number of moles of Na2S x Molar mass of Na2SMass of Na2S = 0.999 moles x 78.04 g/molMass of Na2S = 77.96 gTherefore, 77.96 grams of Na2S will be produced from 24 grams of C.LONG ANSWER IN 100 WORDS:First, we need to balance the given chemical equation as follows:Na2SO4 + 2C → Na2S + 2CO2To determine the amount of Na2S produced from 24 grams of C, we need to use stoichiometry.
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Describe 3 ways students dispose of garbage at your school
Answers
Answer:
Make Recycle Bins Easily Accessible
Ditch Single-Use Waste
Minimise Paper Waste
Designate a Drawer for Scrap Paper
Eco-Friendly Lunches
In an odometer measures the mileage of a car to 1/10, or 0.1, of a mile. Circle the measurement that shows an appropriate level of precision For this odometer.between 60 and 70 miles. 65 miles 65.8 miles. 65.729 miles
Answers
Answer:
65.8 miles
Explanation:
1.00 pint of milk has a volume of how many milliliters? ( 2 pints = 1 quart)
Answers
1.00 pint of milk is equal to 473.18 milliliters, based on the conversion factor of 1 pint = 473.18 milliliters.
To convert pints to milliliters, we can use the conversion factor of 1 pint = 473.18 milliliters.
Since we have 1.00 pints of milk, we can multiply it by the conversion factor to find the volume in milliliters:
1.00 pint * 473.18 milliliters/pint = 473.18 milliliters.
Therefore, 1.00 pint of milk is equivalent to 473.18 milliliters. It's important to note that this conversion factor is based on the standard definition of a pint, which is equal to 473.18 milliliters. In some countries, the pint may have a different value, so it's essential to use the appropriate conversion factor based on the specific context or region.
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Which of the following are not the effects of parathyroid hormone?
(a) Stimulates the process of bone resorption
(b) Decreases Ca2+ level in blood
(c) Reabsorption of Ca2+ by renal tubules
(d) Decreases the absorption of Ca2+ from digested food
(e) Increases metabolism of carbohydrates
Answers
The correct answer is (e) Increases metabolism of carbohydrates. Parathyroid hormone (PTH) is a hormone secreted by the parathyroid glands that regulates calcium and phosphorus levels in the body.
PTH stimulates the process of bone resorption, releasing calcium and phosphorus from bones into the blood. It also increases the reabsorption of calcium by renal tubules, preventing it from being excreted in urine.
PTH also has an indirect effect of increasing blood calcium levels by promoting the conversion of vitamin D into its active form, which increases intestinal absorption of calcium.
The hormone does not have any direct effect on metabolism of carbohydrates. Therefore, option (e) is not an effect of parathyroid hormone.
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Matching Question Match each type of carboxylic acid derivative to the correct description. (i) Instructions Acid chlorides and esters experience primarily 1º and 2º amides experience primarily 1° and 2º amides Acid chlorides, ester, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape. hydrogen bonding between their molecules. dipole-dipole interactions between their molecules. have the highest boiling points among other carboxylic acid derivatives of similar size and shape.
Answers
The correct matches are:
(i) Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules.
(ii) 1º and 2º amides experience primarily hydrogen bonding between their molecules.
(iii) Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape.
(iv) 1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape.
i.
Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules due to the presence of polar bonds within the molecules.
ii.
1º and 2º amides experience primarily hydrogen bonding between their molecules, as they contain the necessary hydrogen and oxygen or nitrogen atoms for hydrogen bonding.
iii.
Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape. This is due to the absence of hydrogen bonding in these compounds, resulting in weaker intermolecular forces.
iv.
1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape. This is because they can form extensive hydrogen bonding between their molecules, leading to stronger intermolecular forces and higher boiling points.
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how do wavelengths relate to energy?
Answers
Answer:
Just as wavelength and frequency are related to light, they are also related to energy. The shorter the wavelengths and higher the frequency corresponds with greater energy. So the longer the wavelengths and lower the frequency results in lower energy.
Explanation:
find the ph of a buffer solution of 60 ml of 0.25 m hcooh and 10.0 ml of 0.500m naxooh
Answers
the pH of the given buffer solution is 3.08.
The given buffer solution is made up of 60 mL of 0.25 M HCOOH and 10.0 mL of 0.500 M NaXOOH and we are to determine its pH.
The first step in solving this problem is to determine the moles of each species in the buffer. This can be accomplished by using the following equation:
n(HCOOH) = 0.25 moles/L x 0.060 L = 0.015 moles of HCOOHn
(NaXOOH) = 0.500 moles/L x 0.010 L = 0.005 moles of NaXOOH
Next, we need to calculate the concentration of the buffer:
Concentration of buffer = moles of HCOOH / total volume of buffer= 0.015 moles / (0.060 + 0.010) L = 0.1875 M
Now that we have the concentration of the buffer, we can use the Henderson-Hasselbalch equation to determine the pH:
pH = pKa + log ([A-] / [HA])
where pKa = 3.75 for HCOOHpH = 3.75 + log [(0.005 moles / 0.070 L) / (0.015 moles / 0.070 L)]= 3.75 + log [0.07143 / 0.21428]= 3.75 + (-0.6706)= 3.08
Therefore, the pH of the given buffer solution is 3.08.
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How do you think the vertical temperature
profile across the pot will change after the pot has been on the
burner for several minutes?
Answers
thermal conduction and convection processes we explain the temperature profile: warmer at the bottom and colder at the top
Temperature is a measure of the internal energy of molecules.
When the pot is on the burner, the lower part of the pot acquires energy from the flame, this energy increases the temperature of the metal that is in contact with the liquid from the bottom, by a process of thermal conduction, while the liquid in the top is kept at the same temperature.
As time progresses, the hotter lower liquid, for which it has a lower with the metal bottom heats up by conduction. density, conscientiously rise and a transfer of heat is created by convection, which raises the temperature of the hot liquid and makes the liquid fall that is colder from the upper part than at the coming into contact
This cycle is repeated heating all the liquid. But the liquid with the liquid in the lower part always at a higher temperature than the liquid in the upper part, the process stops when the liquid in the lower part reaches the boiling point, than the passage from liquid to gas, during which the temperature remains constant.
With the thermal conduction and convection processes we explain the temperature profile: warmer at the bottom and colder at the top.
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a large volume of 0.1590 m h2so3(aq) is treated with enough naoh(s) to adjust the ph of the solution to 5.63 . assuming that the addition of naoh(s) does not significantly affect the volume of the solution, calculate the final molar concentrations of h2so3(aq) , hso−3(aq) , and so2−3(aq) in solution given that the Ka1 and Ka2 values are 1.50×10−2 and 1.20×10−7 , respectively.
Answers
To calculate the final molar concentrations of H2SO3(aq), HSO−3(aq), and SO2−3(aq) in solution, we need to consider the dissociation of H2SO3. H2SO3(aq) can dissociate into HSO−3(aq) and H+(aq), and further into SO2−3(aq) and H+(aq).
Given that the Ka1 and Ka2 values are 1.50×10−2 and 1.20×10−7, respectively. Calculate the initial concentration of H2SO3(aq) using its volume and molarity. Use the Ka1 value to calculate the concentration of HSO−3(aq) and H+(aq) at equilibrium.
Subtract the concentration of H+(aq) from the initial concentration of H2SO3(aq) to find the final concentration of H2SO3(aq). Calculate the final concentration of HSO−3(aq) and SO2−3(aq) by subtracting the concentration of H+(aq) from their respective equilibrium concentrations.
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3. When two atoms are combined what do they make?
Answers
Answer:
When two or more atoms chemically bond together, they form a molecule. Sometimes the atoms are all from the same element. For example, when three oxygen atoms bond together, they form a molecule of ozone (O3). If a molecule forms from atoms of two or more different elements, we call it a compound.
Explanation:
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Which isotope of sulfur is the most naturally abundant
Answers
Answer:
The Isotope of sulfur.
32S 94.99% stable.
33S 0.75% Stable.
Explanation:
if the level of flt3lg decreases, what might happen? conversely, if the levels of flt3lg increase, what might happen?
Answers
If the level of flt3lg decreases, it can have several effects on the body. Flt3lg, also known as FMS-like tyrosine kinase 3 ligand, is a protein that plays a crucial role in the production and development of certain white blood cells called dendritic cells. These cells are important for the immune response.
When the level of flt3lg decreases, there may be a reduction in the number and function of dendritic cells. This can weaken the immune system's ability to recognize and fight off infections and diseases. It can also impact the body's ability to generate an effective immune response to vaccines.
On the other hand, if the levels of flt3lg increase, it can have a positive impact on the immune system. Higher levels of flt3lg can lead to an increased production and maturation of dendritic cells, thereby enhancing the immune response. This can help the body better defend against infections and diseases.
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at stp, 22.4 liters of nitrogen gas, n2, will have a mass of
Answers
At STP, 22.4 liters of nitrogen gas (N2) will have a mass of 28 grams.
At STP (Standard Temperature and Pressure), which is defined as a temperature of 0°C (273.15 K) and a pressure of 1 atmosphere (atm), 22.4 liters of any gas will contain one mole of the gas.
This is based on Avogadro's Law, which states that equal volumes of gases at the same temperature and pressure contain the same number of particles, regardless of their chemical nature and physical properties.
To find the mass of 22.4 liters of nitrogen gas (N2) at STP, you first need to determine the molar mass of nitrogen gas. Nitrogen has an atomic mass of approximately 14 atomic mass units (amu). Since N2 is a diatomic molecule, meaning it consists of two nitrogen atoms, the molar mass of N2 is 2 * 14 amu = 28 grams per mole.
Now that you have the molar mass, you can determine the mass of 22.4 liters of nitrogen gas at STP. Since there is one mole of N2 in 22.4 liters at STP and the molar mass of N2 is 28 grams per mole, the mass of 22.4 liters of nitrogen gas at STP is:
1 mole * 28 grams per mole = 28 grams
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What can be concluded about the purpose many robots will have in the future
Answers
Non-native species are typically introduced into an area because they serve a purpose. Why was kudzu introduced into the United States? Check all that apply.
Answers
Answer:
Explanation:
The Kudzu is a plant that was introduced to the United States from Japan in the year 1876. In the United States it was introduced as an ornamental plant but with a reason which was to prevent soil erosion. Kudzu was disseminated as being high-protein content used to steer feed as well as a spreading plant to counteract soil erosion.
Answer:
Kudzu was introduced as an ornamental plant.
+
Kudzu was introduced as a way of preventing soil erosion.
So, A and D!
many acid-base reactions a starting material with a net _____ charge is usually an acid while a starting material with a net _____ charge is often a base. multiple choice question.
Answers
In many acid-base reactions, a starting material with a net Positive charge is usually an acid while a starting material with a net Negative charge is often a base.
In many acid-base reactions, a starting material with a net positive charge is usually an acid, while a starting material with a net negative charge is often a base. Acids are substances that can donate protons (H+) and are therefore positively charged when they lose a proton. Bases, on the other hand, can accept protons (H+) and tend to have a net negative charge when they gain a proton. This is based on the concept of proton transfer in acid-base reactions, where the acid donates a proton (positive charge) to the base, resulting in the formation of a new acid and base. It's important to note that not all acids or bases have a net charge, as their acidity or basicity can also be determined by other factors such as electron pair donation or acceptance.
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An example of a physical change is
A) crushing a rock
B) shirt fading in the sun
(From USATESTPREP)
Answers
Answer:
A: Crushing a Rock
Explanation:
The rock is physicially being broken down and turned into either smaller pieces of rock or dust if you pound it hard enough.
Answer:
the answer is a) crushing a rock because even though you broke it, its still a rock just in smaller pieces. B is not the answer because its a chemical change. The shirt is losing colour and you can't reverse it.
what property of a solution is the same before and after it is diluted?
Answers
The property of a solution that remains the same before and after it is diluted is its molar concentration. Dilution does not change the number of moles of solute present in the solution, only the volume of the solution.
Dilution refers to the process of reducing the concentration of a solute in a solution by adding more solvent. When a solution is diluted, the total number of moles of solute remains constant. This means that the molar concentration, which is defined as the amount of solute per unit volume of the solution, remains the same before and after dilution.
The molar concentration is calculated by dividing the number of moles of solute by the volume of the solution. In a diluted solution, although the volume of the solution increases, the number of moles of solute does not change. As a result, the ratio of moles of solute to the volume of the solution, which represents the molar concentration, remains constant.
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what is the highlighted 2 in this portion of a chemical reaction called? 3h20 T/F
Answers
The highlighted "2" in this portion of a chemical reaction is the coefficient of the molecule, indicating the number of molecules present in the reaction.
The coefficient is used to balance chemical reactions and ensure that the number of atoms of each element remains constant before and after the reaction.
A chemical reaction is a process that results in the transformation of one set of chemical substances into another. It involves the rearrangement of atoms and the formation and breaking of chemical bonds. Chemical reactions can be represented using chemical equations, which indicate the reactants (the starting substances) on the left side and the products (the resulting substances) on the right side, separated by an arrow.
The rate of a chemical reaction depends on several factors, including the concentration of the reactants, the presence of a catalyst, and the temperature. Understanding chemical reactions is important in many areas of chemistry, including the design of new materials, the development of new energy sources, and the understanding of biological processes.
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7. Which of the following properties identifies a pure substance?
A. soluble in water
B. tasteless and odorless
C. has a constant boiling temperature
D. can be changed from liquid to gas and back to liquid.
Answers
Answer:
Soluble in water
Explanation: