The freezing point of a solution in which 2.5 grams of NaCl is added t0 230 ml of water is : - 0.69°C
Determine the freezing point of the solution
First step : Calculate the molality of NaCl
molality = ( 2.5 grams / 58.44 g/mol ) / ( 230 * 10⁻³ kg/ml )
= 0.186 mol/kg
Next step : Calculate freezing point depression temperature
T = 2 * 0.186 * kf
where : kf = 1.86°c.kg/mole
Hence; T = 2 * 0.186 * 1.86 = 0.69°C
Freezing point of the solution
Freezing temperature of solvent - freezing point depression temperature
0°C - 0.69°C = - 0.69°C
Hence the Freezing temperature of the solution is - 0.69°C
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Match the states of matter to their properties. Drag the items on the left to the correct location on the right.
solids
liquids
gases
indefinite shape, but definite volume
indefinite shape and indefinite volume
definite shape and definite volume
lowest density
particles glide past each other
highest density
solids Highest density definite shape and colour
liquids Indefinite shape and defining volumes particles glide past each other
Gases Indefinite shape Indefinite volume lowest density
Explanation:
this is due to the nature of its molecules
The ph at the equivalence point in weak acid-strong base titration is.
Question 1 of 10
What is a flame test used for?
Answer:
B
Explanation:
A flame test is used to identify an unknown sample by its emission spectrum. The correct answer is option B.
Flame tests are used to identify the presence of certain metal ions in a sample based on the color of the flame that is produced when the sample is heated.
When a metal ion is heated in a flame, it absorbs energy from the flame and becomes excited. As the metal ion returns to its ground state, it releases energy in the form of light, which causes the flame to emit a characteristic color.
The color of the flame is specific to the metal ion that is present and can be used to identify the metal ion based on a color chart.
Therefore option B. "to identify an unknown sample by its emission spectrum" is the correct answer.
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A 16.1 mL sample of an HCl solution is found to contain 3.0 x 10-3 mol HCl. What is the molarity of this solution
Taking into account the definition of molarity, the molarity of the solution is 0.186[tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of the solution in this caseIn this case, you know:
number of moles= 3×10⁻³ molesvolume= 16.1 mL= 0.0161 LReplacing in the definition of molarity:
[tex]Molarity=\frac{3x10^{-3} moles}{0.0161 L}[/tex]
Solving:
molarity= 0.186[tex]\frac{moles}{liter}[/tex]
Finally, the molarity of the solution is 0.186[tex]\frac{moles}{liter}[/tex].
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What are the main differences between the carbon flows 300 years ago and today?
The rate and quantity of carbon flow today has increased exponentially compared to 300 years ago.
What is carbon flow?Carbon flow refers to the process by which carbon flows through the earth.
Carbon flow can also be referred to as the carbon cycle.
Due to industrialization and the burning of fossil fuels, the rate of carbon flow has increased exponentially.
Therefore, compared to 300 years ago, the rate and quantity of carbon flow has increased.
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What can be used to determine the age of a victim between age 15 and 22 from dental remains?
Answer:
When determining the age of a victim withing ages 15-22, dental remains provide comparison of the stage of tooth formation shown in X-rays and bone.
The reason an ionic bond forms can best be described as.
Explanation:
the difference in electronegativity between metals and non-metals is so great that the non-metals simply take the electrons from the metals forming ions of opposite charge.
How do atoms move in a space craft differently in a united states spacecraft vs soviet union. “WILL MARK BRAINLIEST”!!
Answer:
United States
Molecules themselves can move in any direction, they can rotate, and they can vibrate as the atoms within a molecule move back and forth relative to each-other, as if the chemical bonds connecting them were springs. Answer 5: They bounce around and wiggle and jiggle around.
Soviet Union
In terms of actually transporting this east, any and every means was used. Rail was obviously key - the evacuation alone used some 1.5 million rail cars in 1941 - but trucks were also used. Korolev planned to move forward with the Soyuz craft and N-1 heavy booster that would be the basis of a permanent crewed space station and crewed exploration
I’m so sorry if it’s wrong I tried my best
The light traveled from _____________________ to __________________. (What transparent materials?)
Explanation:
High density medium to low density medium.
What is the source of the energy that causes electrons to be emitted from the surface?.
Answer:
sunlight
Explanation:
it is the sunlight
A sample of helium had a volume of 3.20x102 mL at STP. What will be it’s new volume of the temperature is increased to 425.0k and it pressure is increased to 3.50 atm?
The new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.
Combined gas law
Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given the data in the question;
Initial volume of helium gas V₁ = 3.20 × 10²mL = 0.32LAt standard remperature and pressure
Initial pressure P₁ = 1.0atmInitial temperature T₁ = 273.15KFinal pressure P₂ = 3.50atmFinal temperature T₂ = 425.0KFinal volume V₂ = ?To calculate the new volume of the helium gas, we subtsitute our given values into the expression above.
P₁V₁/T₁ = P₂V₂/T₂
P₁V₁T₂ = P₂V₂T₁
V₂ = P₁V₁T₂ / P₂T₁
V₂ = ( 1.0atm × 0.32L × 425.0K ) / ( 3.50atm × 273.15K )
V₂ = 136LatmK / 956.025atmK
V₂ = 0.14L
V₂ = 1.40×10²mL
Therefore, the new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.
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Please help with this question. At first i chose the second answer but it’s wrong.
Answer:
D
Explanation: gas particles are attracted to one another is NOT an assumption we make for ideal gasses
Change of state from a solid to a liquid with the addition of energy
Is what
Answer:
Melting
Explanation:
Which of the following statements is true about the specific heat capacity of a substance?
A. It is an intensive physical property.
B. It is higher for good conductors.
C. It depends on the amount of substance.
D. It depends on the melting point of substance.
Answer:
Option A
Explanation:
Specific heat capacity is independent of quantity or it doesn't depends upon quantityHence it's intensiveOn opposite heat capacity is extensive
The specific heat capacity of a substance is an intensive physical property; option A.
What is specific capacity of a substance?The specific heat capacity of a substance is the amount in which the heat content of a unit mass of that substance will change when its temperature changes by one degree.
Specific heat capacity of a substance is an intensive property and does not depend on the mass of the substance.
Therefore, the true statement is that specific heat capacity of a substance is an intensive physical property.
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What are requirements before you can compare the energy (or enthalpy or Gibbs free energy) for 2 compounds
The main two requirements to compare the energy for 2 compounds are the balanced chemical formula and the temperature of the compounds.
How do we calculate the free energy change?Gibb's free energy change of any reaction will be calculated by using the below equation as:
ΔG = ΔH - TΔS, where
ΔH = change in enthalpy
T = temperature
ΔS = change in entropy
Before calculating the free energy of any reaction you should first balance the given chemical reaction to check the involved moles of substance and also the value of temperature before & after the completion of reaction to check the nature of the reaction.
Hence balancing the equation and checking the temperature are the two requirements.
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An ion has 28 protons, 24 electrons, and 30 neutrons. What is its ionic
charge?
If chloride is a ligand to a transition metal it will not be precipitated by silver nitrate. True False
Answer:True
Explanation:
If the chloride ligand is coordinated with the transition metal and present inside the coordination sphere then it will not precipitate by silver nitrate.
What are ligands?A ligand can be described as an ion or molecule, which donates a pair of electrons to the central metal ion to form a coordination complex. Ligands can be anionic, cationic, or neutral molecules. Ligands act as Lewis bases because they can donate electron pairs and metal atoms as Lewis acids as they act as electron pair acceptors.
The bonding between transition metal to ligand varies from the covalent bond to the ionic bond. Ligands can be cations (NO⁺) and electron-pair acceptors and anionic ligands are F⁻, Cl⁻, Br⁻, I⁻, CN⁻, OH⁻, NH₂⁻ , and neutral ligands are NH₃, H₂O, NO, and CO.
A ligand binds to the central transition metal to form a coordination complex compound. The ligand that is bonded to metal cannot be precipitated.
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Differentiate the 3 types of evolution in Science
Answer:
Brainliest pls
Explanation:
shows the three main types of evolution: divergent, convergent, and parallel evolution.
Divergent: tending to be different or develop in different directions.
Convergent: coming closer together, especially in characteristics or ideas.
Parallel evolution: implies that two or more lineages have changed in similar ways
What volume will 50. 0 g of nitrogen gas occupy at STP?
Answer:
39.98 liters
Explanation:
hope this helps
A solution in which, if additional solute is added, the solute will remain undissolved at the bottom of the container.
saturated solution: solution that has passed the saturation limit
I need some help pls with science
Answer:
the answer to number 9 is A.
Explanation:
Explain why Argon is so unreactive
Answer:Argon is unreactive because it has the maximum number of electrons in its outer shell. Noble gases are unreactive because they have the full complement of electrons in their outermost energy levels.
Explanation:
Answer:
Argon is element 18 on the periodic table, which means that it has 18 proton in it's nucleus. Argon is in group 8 or 18 depending on your periodic table. Argon is a gas at standard temperature and pressure with a density of 1.784g/l
what factors are included in the Beer's Law expression that determines how much light passes through a liquid solution
Answer:
here.
Explanation:
molar absorptivity, path length of cuvette, test tube, and concentration.
What is the value of n in ch3(ch2)nch3 if the name of the hydrocarbon is heptane? 2 5 7 8
The values of n in CH₃(CH₂)ₙCH₃ if the name of the hydrocarbon is heptane is equal to 5.
What are hydrocarbons?Hydrocarbonds are the compounds which are formed by the composition of hydrogen and carbon atoms.
In the question wanted hydrocarbon is heptane, in which 'hept' means 7 and 'ane' means alkane. Given formula of hydrocarbon is CH₃(CH₂)ₙCH₃ in which already 2 carbons of CH₃ group is present and to complete 7 carbons, the number of n should be 5.
So the required value of n is 5.
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A 12.0g sample of a substance requires 50.9 J to raise its temperature by 6.00 c. What is it’s specific heat
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's find the specific heat of sample using given formula :
[tex]\qquad \tt \dashrightarrow \:Q = m \: s \triangle T[/tex]
where,
Q = heat transfer m = mass S = specific heat[tex] \tt \triangle T [/tex] = change in temperature[tex]\qquad \tt \dashrightarrow \:50.9 = 12 \times \: s \times 6[/tex]
[tex]\qquad \tt \dashrightarrow \:s = \dfrac{50.9}{72} [/tex]
[tex]\qquad \tt \dashrightarrow \:s = 0.707 \: [/tex]
Therefore, specific heat of that substance is 0.707 J/g°C
What are some of the different substances that make up a pizza?
What substances make up water?
Answer:
Explanation:
What kind of ridiculous chemistry question asks you the composition of a pizza?
You could technically write anything along the lines of cheese, bread, tomato-paste, unless the question specifically asks for chemical details.
Water is made from a bond of Hydrogen and Oxygen atoms.
Calculate and compare the molar solubility of Mg(OH)2 in water and in a solution buffered at a pH of 4. 5. Required:
Determine the molar solubility of Mg(OH)2 in water and the pH of a saturated Mg(OH)2 solution
Since Mg(OH)2 is a base, the molar solubility of Mg(OH)2 in water is less than in a solution buffered at a pH of 4.5
What is molar solubility of a solute?The molar solubility of a solute is the amount in moles if a solute that dissolves in a given volume of solvent.
Molar solubility = moles of solute/volume of solvent.Mg(OH)2 is a base which is partially soluble in water.
Molar mass of Mg(OH)2 is 58 g/mol
Moles of Mg(OH)2 can be calculated using the formula: moles = mass/molar mass
The pH of a solution of Mg(OH)2 will be greater than 7.
In a solution buffered at a pH of 4.5, the molar solubility of Mg(OH)2 will be greater than in water since more of the base can dissolve in acidic buffer solution.
Therefore, the molar solubility of Mg(OH)2 in water is less than in a solution buffered at a pH of 4.5
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What properties are used to arrange the
elements in the periodic table.
Answer:
Elements are arranged from left to right and top to bottom in order of increasing atomic number. As, The modern periodic law tells that the Elements in the modern periodic table are arranged by increasing atomic numbers.
Answer:
See below ~
Explanation:
Properties used to arrange elements
Atomic numberValencyNumber of shellsMelting PointElectronic Configurationetc.In a sentence answer "Why do gases exert pressure on the walls of their container?"
Answer:
The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles are in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exert pressure on the gas.
Explanation: Hope this helps!!
Solve the following problems and write your answer in the space provided.
2. What is the molarity of a hydrochloric acid solution that has a volume of 1500
mL and contains 441 g of HCI?
Taking into account the definition of molarity, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of a hydrochloric acid solutionIn this case, you know:
number of moles= 441 g× [tex]\frac{1mole}{36.45 g}[/tex]= 12.099 moles (being 36.46 [tex]\frac{g}{mole}[/tex] the molar mass of NaNO₃, this is,the amount of mass that a substance contains in one mole.)volume= 1500 mL= 1.5 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]Molarity=\frac{12.099 moles}{1.5 L}[/tex]
Solving:
molarity= 8.066[tex]\frac{moles}{liter}[/tex]
Finally, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].
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