Which aqueous solution has the lowest freezing point?a. 0.35 m NaClb. 0.50 m glucosec. 0.25 m AlCl3d. 0.30 m MgBr2
Answers
The determine which aqueous solution has the lowest freezing point, we need to consider the molality (m) and the number of particles produced by each solute when dissolved in water. Freezing point depression is calculated using the formula. ΔTf = I × Kc × m
The ΔTf is the freezing point depression, I am the can't Hoff factor number of particles produced by the solute, Kc is the freezing point depression constant, and m is the molality of the solution. a. 0.35 m NaCl → Na+ + Cl- I = 2 since NaCl dissociates into two ions ΔTf = 2 × Kc × 0.35 b. 0.50 m glucose (C6H12O6) doesn't dissociate into ions. I = ΔTf = 1 × Kc × 0.50 c. 0.25 m AlCl3 → Al3+ + 3Cl- I = 4 (since AlCl3 dissociates into four ions) ΔTf = 4 × Kc × 0.25 d. 0.30 m MgBr2 → Mg2+ + 2Br- I = 3 since MgBr2 dissociates into three ions ΔTf = 3 × Kc × 0.30 Comparing the ΔTf values - 0.35 m NaCl: ΔTf = 2 × Kc × 0.35 - 0.50 m glucose: ΔTf = 1 × Kc × 0.50 - 0.25 m AlCl3: ΔTf = 4 × Kc × 0.25 - 0.30 m MgBr2: ΔTf = 3 × Kc × 0.30 The largest ΔTf value corresponds to the lowest freezing point. Since 4 × 0.25 > 3 × 0.30 > 2 × 0.35 > 1 × 0.50, the 0.25 m AlCl3 solution has the lowest freezing point. The correct answer is c. 0.25 m AlCl3.
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Related Questions
BRAINLIEST AND FIVE STARS WITH A THANKS IF YOU ATLEAST ANSWER
Why are sedimentation ponds useful for reducing the affects of soil erosion?
A. They provide a place to raise fish that can be used to replace fish harmed by sedimentation.
B. They provide a water source that can be used for irrigation of crops.
C. They provide a place to collect soil sediment so that it doesn’t reach ponds, lakes and rivers.
D. They help transport soil sediments to rivers, ponds and lakes.
Answers
Answer:
I think D
Explanation:
Answer:
A
Explanation:
Sediment, as a physical pollutant, impacts receiving waters in the following principal ways: High levels of turbidity limit penetration of sunlight into the water column, thereby limiting or prohibiting growth of algae and rooted aquatic plants.
(GIVING BRAINLIEST)
The table below shows the characteristics of three components of the solar system labeled A, B, and C. Which choice identifies the components in the correct order?
1 Comet, asteroid, sun
2 Moon, planet, sun
3 Moon, sun, planet
4 Sun, planet, moon
Answers
Answer:
4 sun , planet, moon are the components in the correct order
1Calculate the density of an object that has a mass of 84.7g and a volume of 59.3 cm3
Answers
Answer:
1.43 g/cm³Explanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\\)
From the question
mass = 84.7 g
volume = 59.3 cm³
We have
\(density = \frac{84.7}{59.3} \\ = 1.428330...\)
We have the final answer as
1.43 g/cm³Hope this helps you
A radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Find the half-life of this radioisotope.
Answers
The half life of the isotope is 60 minutes.
What is half life?The term half life refers to the time taken for an isotope to decay to half of its original amount. In order to find the half life of the isotope, we can use the formula;
N/No =(1/2)^t/t1/2
Where;
N = mass of the isotope at time t
t = time taken
t1/2 = half life of the isotope
No = mass of the isotope originally present
Hence;
17/32 = (1/2)^60/t1/2
(0.5)^1 = (0.5)^60/t1/2
1 = 60/t1/2
t1/2 = 60 minutes
The half life of the isotope is 60 minutes.
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If one electron in an atom is excited but does not have enough energy to escape, the energy of the excited electron must have one of a set of quantized values.a. Trueb. False
Answers
A woman uses 330 Joules of energy to push a box across the floor in 33 seconds. What is her power output in Watts?
Answers
Answer:
10 watts
Explanation:
Power = Work / Time
Power = 330 J / 33 s
Power = 10 watts
Super find 40 gauge copper wire is a diameter of only 0.080 mm and Waze only 44.5 g/km. Suppose a spool of 40 gauge wire weighs 471. g Les after some wire is pulled off to wind a magnet. How could you calculate how much wire is used. Set the math up. Do not do any of it just leave your answer as a “math expression”Also be sure your answer includes all correct unit symbols
Answers
Answer:
10.58km
Explanations:The formula needed to calculate the amount of wire used is expressed as:
\(\text{length of wire used=}\frac{W}{w_g}\)W is the weight of wire used to wind a magnet
wg is the weight of wire per km
Given the following parameters:
\(\begin{gathered} W=471g \\ w_g=44.5\text{g/km} \end{gathered}\)Substitute the given parameters into the formula to have:
\(\begin{gathered} \text{Length of wire used=}\frac{471\cancel{g}}{44.5\cancel{g}km^{-1}} \\ \text{Length of wire used}=\frac{471}{44.5}km \\ \text{Length of wire used=}10.58\operatorname{km} \end{gathered}\)Hence the length of wire used is 10.58km
What volume of a 4.5 m hcl solution do you need to dilute and prepare a 65 l of a 0.050 m solution of hcl? (2 s.f)
Answers
0.72 L (or 720 mL) of the 4.5 M HCl solution is required to prepare a 65 L solution of 0.050 M HCl.
We need to dilute a concentrated 4.5 M HCl solution. We can use the dilution equation to calculate the volume of the concentrated solution required:
\(M_1V_1 = M_2V_2\)
where M1 is the concentration of the concentrated solution, V1 is the volume of the concentrated solution required, M2 is the concentration of the diluted solution, and V2 is the final volume of the diluted solution.
In this case, we want to prepare a 65 L solution of 0.050 M HCl from a 4.5 M HCl solution. Therefore:
\(M_1\) = 4.5 M
\(V_2\) = 65 L
\(M_2\) = 0.050 M
Solving for V1:
\(V_1 = (M_2 * V_2) / M_1 \\V_1 = (0.050 M * 65 L) / 4.5 M \\V_1 = 0.72 L\)
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(ii) Ga bubble of __________ will be evolved at the electrode in
the given experiment.
a) Oxygen and Hydrogen
b) Carbon dioxide and Hydrogen
c) Oxygen and Carbon dioxide
d) None of thee
Answers
a) Oxygen and Hydrogen That is accurate, indeed. An oxygen and hydrogen gas bubble will develop at the electrode in the experiment. This is due to the fact that during the electrolysis process, a material that
The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidising agent that easily produces oxides with most elements as well as other compounds. After hydrogen and helium, oxygen is the third most plentiful element in the universe and the most prevalent element on Earth. Two atoms of the element combine to generate dioxygen, a colourless and odourless diatomic gas with the formula O 2, at ordinary temperature and pressure. The Earth's atmosphere is now made up of 20.95% diatomic oxygen gas, however this has fluctuated significantly over a very long time. In the form of oxides, oxygen makes up over half of the Earth's crust. [3]
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How many moles of hydrogen are produced when 6.28 mol of oxygen form?
Answers
Answer:
3.14 is the answer
Explanation:
hope it may help you
a sample in a spectrophotometer gives a percent transmittance of 53.9 %. what is the absorbance of the sample?
Answers
Absorbance of the sample is found to be 0.269
Absorbance = 2 - (log%T)
A = 2 - 1.731
= 0.269
The amount of light absorbed by a solution is measured by its absorbance (A), often referred to as optical density (OD). In spectrophotometry, absorbance and transmittance percentage are often used.
Different materials allow light to pass through them to differing degrees of success. Transparent materials permit the passage of light. Although translucent materials allow some light to pass through, you cannot see much of what is on the other side. Materials that are opaque block the flow of light. Transmittance, which compares the quantity of light energy that goes through a material to the amount of light energy that enters the medium, is typically expressed as a percentage. In contrast to completely opaque materials, which transmit 0% of light, absolutely transparent materials transmit 100% of light. Light may pass through a variety of colours of materials.
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Which of the following properties is a common property of acids?
a) pH values < 7
b) insoluble in water
c) does not conduct electricity
d) does not react with metals
Answers
The correct answer is a) pH values < 7. Acids are substances that donate hydrogen ions (H+) when dissolved in water, which increases the concentration of H+ ions in the solution.
This excess of H+ ions causes the pH of the solution to decrease below 7, which is considered neutral. Therefore, solutions with pH values below 7 are acidic, while solutions with pH values above 7 are basic or alkaline.
Insolubility, lack of conductivity, and lack of reactivity with metals are not properties common to all acids. Some acids can be soluble in water, conduct electricity, or react with metals, depending on their specific chemical properties.
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The nucleus of an atom contains ________________________________________.
Answers
Answer:
protons(positively charged) and the neutrons (no charge)
Explanation:
Answer:
The nucleus of an atom contains protons and neutrons.
A homogenous mixture that is mainly composed of water is referred to as a(n) __________ solution.
Answers
Answer:
solvent solutions
Explanation:
.............
Define an arrhenius base and describe properties of bases. use an example to explain how an arrhenius base will behave in water.
Answers
An Arrhenius base is a molecule that when dissolved in water will break down to yield an \(OH^-\) or hydroxide in solution.
What is Arrhenius base?An Arrhenius base is a compound that increases the OH− ion concentration in aqueous solution.
An Arrhenius base is a substance that, when dissolved in an aqueous solution, increases the concentration of hydroxide, or \(OH^-\), ions in the solution.
Bases Properties
Arrhenius bases that are soluble in water can conduct electricity.
Bases often have a bitter taste and are found in foods less frequently than acids. Many bases, like soaps, are slippery to the touch.
Bases also change the colour of indicators. Red litmus turns blue in the presence of a base (see figure below), while phenolphthalein turns pink.
Some bases react with metals to produce hydrogen gas.
Acids (pH < 7.0) react with bases (pH > 7.0) to produce a salt and water. When equal moles of an acid and a base are combined, the acid is neutralized by the base. The resulting mixture will have a more neutral pH.
An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of H+ ions in the water. In contrast, an Arrhenius base dissociates in water to form hydroxide ions, \(OH^-.\)
Example, sodium hydroxide, is added to an aqueous solution. NaOH dissociates into sodium, \(Na^+\), and hydroxide, \(OH^-,\) ions.
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CHemistry middle school please help
Answers
The characteristics of a certain group of elements as listed are those of strontium.
The correct option is D.
Which of the elements is in this group with given properties?Elements in the Periodic Table are organized into groups and periods.
Elements in the same group have the same number of valence electrons.
Elements in the same period have the same number of electron shells.
The characteristics of a Group of Elements are given below
. Is shiny
• Is solid at room temperature
• Has atoms with two valence electrons, hence belongs to group 2.
The above element is strontium since it is the only element in group 2.
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Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu.
Calculate the actual atomic mass of Cu-65.
Answers
Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.
Average atomic mass = sum of masses of isotopes multiply by % of abundance
Cu - 63, mass = 62.9298 amu, % abundance = 69.09 %
Cu - 65, mass m2 = ? % abundance = 30.91 %
average atomic mass = 63.546 amu
average atomic mass = ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )
63.546 = ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )
m2 = 64.93 amu
Thus, Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.
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Which compound is an isomer of C2H5OC2H5?
A) CH3COOH
B) C2H5COOCH3
C) C3H7COCH3
D) C4H9OH
Answers
Answer:
D) C₄H₉OH
Explanation:
In chemistry, isomers are chemical substances with the same formula (That is, same atoms but in different structures).
For the compound C₂H₅OC₂H₅ there are 4 atoms of C, 10 atoms of H and 1 atom of O.
A) CH₃COOH . This compound have 2 atoms of C, 4 atoms of H and 2 atoms of O. Thus, isn't an isomer.
B) C₂H₅COOCH₃. There are 4 atoms of C but 8 atoms of H and 2 atoms of O. Isn't an isomer
C) C₃H₇COCH₃. There are 5 atoms of C, 10 atoms of H and 1 atom of O. Thus, isn't an isomer
D) C₄H₉OH. Here, you have 4 atoms of C, 10 atoms of H and 1 atom of O. That means this structure is the isomer of C₂H₅OC₂H₅
Do substances that heat up quickly normally have high or low specific heat capacities?
Answers
the ocean is a heat sink and absorbs a lot of heat, however water has a high heat capacity
he long run equilibrium condition for perfect competition is:
a. P=AVC=MR=MC.
b. Q=AVC=MR=MC.
c. Q=ATC=MR=MC.
d. P=ATC=MR=MC.
Answers
Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).
Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.
In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.
Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
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For the molecule COBr2 Upload the correct Lewis structure (including resonance forms, if com to the PL What is the geometry of the molecule? Is it polar or non-polar? What is the hybridization of the central atom?
Answers
COBr2 is polar in nature and prefers to dissolve in polar solvents like water, ethanol, and methanol, among others, cobr2 is soluble in polar solvents.
Which way does Cobr2 polarize?Because cobr2 is polar in nature and prefers to dissolve in polar solvents like water, ethanol, and methanol, among others, cobr2 is soluble in polar solvents.Lewis structures use a 2D representation to show where the electrons are placed, whereas molecular geometry only uses 3 dimensions when the bond atoms are present (whether its lone-pair or atom).Given that COBr2 has a double bond, we anticipate that the Br-C-Br and Br-C-O angles will be only slightly above and below 120 degrees, respectively.To learn more about polar solvents refer to:
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Please help!!
If u know any please tell!?
Answers
Answer: 176 g N2O, 72 g H2O
Explanation:
1. 64g O2 * (1 mol O2)/(32 g O2) * (2 mol N2O)/(1 mol O2) * (44g N2O)/(1 mol N2O) = 176 g N2O
2. 32g CH4 * ( 1 mol CH4)/(16 g CH4) * (2 mol H2O)/(1 mol CH4) * (18 g H2O)/(1 mol H2O) = 72 g H2O
Explain how the water cycle is a reversible process.
Answers
Answer:
The water cycle is a series a of reversible changes. The sea water under the action of heat get vaporised which in turn changes into clouds. These clouds provide rain. The rain water then flows to the streams and rivers which eventually falls back to the oceans and seas.
how much energy is needed to convert 120g of ice at -35°C to steam at 150°C?
Answers
When an object resist movement by a force
Answers
Answer: Inertia
Explanation:
The mass of a 8.41 mL liquid sample was determined to be 10.8405 g. What is the density of the liquid
Answers
Answer: 1.289 g/ml
Explanation:
density= m/v
m=10.8405
v=8.41
10.8405/8.41
d= 1.289 g/mL
Explain how delta ΔT would be affected if a greater amount of surrounding solvent (water) is used, assuming the mass of salt remains constant?
Answers
Depression in the freezing point which means deltaT decreases as the mass of the solvent increases while the solute remains constant.
Molality is defined as the ratio of the number of moles of solute to the mass of solvent in kg. The molality is inversely proportional to the mass of the solvent. From the depression in freezing point, molality is in direct relation with the depression in the freezing point.
Therefore, depression in the freezing point which means deltaT decreases as the mass of the solvent increases while the solute remains constant.
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In the lab, chemist analyzed a sample of methanol and found that it was made of 6. 20 g of carbon, 4. 10 g of hydrogen, and 15. 90 g of oxygen. What is the percent composition of each element? Round each answer to the tenths place
Answers
The percentage composition of carbon is 19.37% and percentage of oxygen is 49.68% and percentage composition of hydrogen is 12.8%.
According to question,
6.20g of carbon, 4.10g of hydrogen and 15.90g of oxygen is present in total sample of methanol.
Total mass of methanol is=mass of carbon x 1+ mass of oxygen x 1+mass of hydrogen x 4
Total mass= 12x1+16x1+1x4
Total mass=32g
Now, to find the percentage composition of each element use the total mass and given mass of element.
The ratio of the amounts of each element to the sum of the individual element amounts present in the compound, multiplied by 100, is the definition of the percentage composition of a given compound. In this instance, the quantity is expressed in gram of the constituent ingredients.
Percentage composition\(=\frac{mass of an element}{total mass}*100\)
Percentage composition of carbon=\(\frac{6.20}{32} *100\)
On solving we get,
Percentage composition of carbon=19.37%
Percentage composition of oxygen=\(\frac{15.90}{32}*100\)
On solving we get,
Percentage composition of oxygen=49.68%
Percentage composition of hydrogen=\(\frac{4.10}{32}*100\)
On solving we get,
Percentage composition of hydrogen=12.8%
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It takes 547 kJ to remove one mole of electrons from the atoms at the surface of a solid metal.
What is the maximum wavelength of light capable of doing this?
Answers
According to the relation of variables in the electromagnetic spectrum the maximum wavelength of light is 36.3 ×10\(^-\)³¹ m.
What is electromagnetic spectrum ?The electromagnetic spectrum consists of electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In the given problem,energy is related to wavelength by the formula, λ=hc/E,λ=6.626×10\(^-34\)×3×10⁸/547×1000=36.3×10\(^-31\) m.
Thus, the maximum wavelength of light is 36.3×10\(^-31\) m.
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if you add heat to water at 0 °c, the water will decrease in volume until it reaches
Answers
If you add heat to water at 0°C, the water will decrease in volume until it reaches its maximum density at 4°C.
Water is unique in that it reaches its maximum density at a temperature of 4°C. As water is heated from 0°C to 4°C, it becomes more dense and contracts, which causes its volume to decrease. However, as the temperature of water increases beyond 4°C, it becomes less dense and expands, causing its volume to increase. This is why ice floats on water, as it is less dense than liquid water. The property of water reaching its maximum density at 4°C has important implications for aquatic ecosystems, as it allows for the circulation of water and nutrients in lakes and oceans, which is essential for the survival of many aquatic organisms.
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