Answer:
2.64 M
Explanation:
To find the molarity, you need to (1) convert grams to moles (via molar mass), then (2) convert mL to L, and then (3) calculate the molarity (via molarity ratio). The final answer should have 3 sig figs to match the sigs figs of the given values.
(Step 1)
Molar Mass (NH₄NO₃): 2(14.007 g/mol) + 4(1.008 g/mol) + 3(15.998 g/mol)
Molar Mass (NH₄NO₃): 80.04 g/mol
66.5 grams NH₄NO₃ 1 mole
--------------------------------- x ---------------------- = 0.831 moles NH₄NO₃
80.04 grams
(Step 2)
1,000 mL = 1 L
315 mL 1 L
-------------- x ------------------ = 0.315 L
1,000 mL
(Step 3)
Molarity = moles / volume
Molarity = 0.831 moles / 0.315 L
Molarity = 2.64 M
what is the acid dissociation constant of an monoprotic acid if a concentration of 0.3M solution has a pH of 3?
The acid dissociation constant of a weak monoprotic acid if the concentration of the acid is 0.3M and it has a pH of 3 is 3 × 10⁻⁶.
What is the acid dissociation constant?The acid dissociation constant (Ka) is the equilibrium constant for an acid dissociation reaction.
Let's consider the acid dissociation of a generic weak acid.
HA(aq) = H⁺(aq) + A⁻(aq)
Step 1. Calculate [H⁺].The pH of the solution is 3.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -3 = 1 × 10⁻³ M
Step 2. Calculate the acid dissociation constant (Ka).The concentration of the acid (Ca) is 0.3 M. For a weak monoprotic acid, we can calculate the acid dissociation constant using the following expression.
[H⁺] = √(Ca × Ka)
Ka = [H⁺]² / Ca
Ka = (1 × 10⁻³)² / 0.3 = 3 × 10⁻⁶
The acid dissociation constant of a weak monoprotic acid if the concentration of the acid is 0.3M and it has a pH of 3 is 3 × 10⁻⁶.
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Select which of the following characteristics match with the correct state of matter.
No definite shape
Highly compressible
Definite volume
Low density
The gases have no definite shape, low density, and are highly compressible while the liquids only have a definite volume but no definite shape.
What is a Matter?Any substance which has mass and occupies space is called matter. Commonly, there are three states of matter that are:
Solid - Solids have a rigid shape, definite volume, and high density.Liquid - Liquids have definite volume but no definite shape. They take the shape of the container in which they are placed.Gas - Gases have neither definite shape nor definite volume and have low density. They completely occupy the container in which they are placed.There are other two states of matter that are Plasma and man-made Bose-Einstein condensates. They are not so common.
Plasma is commonly found in the universe. Stars are the superheated balls of the plasma.
Thus, gases have no definite shape, low density, and are highly compressible. On the other hand, the liquids only have a definite volume but no definite shape.
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A 75.1 L sample of gas at 33.2 ºC and 365.7 mm Hg expands to 242.9 L at 6.5 ºC. What is the new gas pressure?
Answer:
103 mmHg
Explanation:
To find the new pressure, you need to use the Combined Gas Law:
P₁V₁ / T₁ = P₂V₂ / T₂
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. You can find the new pressure (P₂) after converting the temperatures from Celsius to Kelvin.
P₁ = 365.7 mmHg P₂ = ? mmHg
V₁ = 75.1 L V₂ = 242.9 L
T₁ = 33.2 °C + 273.15 = 306.35 K T₂ = 6.5 °C + 273.15 = 279.65 K
P₁V₁ / T₁ = P₂V₂ / T₂ <----- Combined Gas Law
(365.7 mmHg)(75.1 L) / 306.35 K = P₂(242.9 L) / 279.65 K <----- Insert values
89.649 = P₂(242.9 L) / 279.65 K <----- Simplify left side
25070.433 = P₂(242.9 L) <----- Multiply both sides by 279.65
103 = P₂ <----- Divide both sides by 242.9
100.0 mL of a 0.695 M solution of KBr is diluted to 500.0 mL. What is the new concentration of the solution?
Answer:
0.116 M
Explanation:
(Step 1)
Calculate the amount of moles using the molarity ratio.
100.0 mL / 1,000 = 0.1000 L
Molarity = moles / volume
0.695 M = moles / 0.1000 L
0.0695 = moles
(Step 2)
Calculate the new molarity using the moles and new volume.
500.0 mL / 1,000 = 0.5000 L
Molarity = moles / volume
Molarity = 0.0695 moles / (0.1000 L + 0.5000 L)
Molarity = 0.0695 moles / (0.6000 L)
Molarity = 0.116 M
What is the mass of a 5.00cm3 piece of copper having a density of 8.96g/cm3
Answer:
44.8 grams
Explanation:
The density exists as a ratio comparing the mass of a piece of copper per 1 cm³. Since you have been given a new volume, you can set up a proportion to find the new mass.
[tex]\frac{8.96 grams}{1.00 cm^3} =\frac{?grams}{5.00cm^3}[/tex] <----- Proportion
[tex]44.8 = (1.00cm^3)(?grams)[/tex] <----- Cross-multiply
[tex]44.8= ?grams[/tex] <----- Divide both sides by 1.00
Urgent!!!
A 74.0-gram piece of metal at 94.0 °C is placed in 120.0 g of water in a calorimeter at 26.5 °C. The final temperature in the calorimeter is 32.0 °C. Determine the specific heat of the metal. Show your work by listing various steps, and explain how the law of conservation of energy applies to this situation.
The specific heat of the metal, given the data from the question is 0.60 J/gºC
Data obtained from the questionThe following data were obtained from the question:
Mass of metal (M) = 74 gTemperature of metal (T) = 94 °CMass of water (Mᵥᵥ) = 120 g Temperature of water (Tᵥᵥ) = 26.5 °C Equilibrium temperature (Tₑ) = 32 °C Specific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC Specific heat capacity of metal (C) =? How to determine the specific heat capacity of the metalThe specific heat capacity of the sample of gold can be obtained as follow:
According to the law of conservation of energy, we have:
Heat loss = Heat gain
MC(T –Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)
74 × C(94 – 32) = 120 × 4.184 (32 – 26.5)
C × 4588 = 2761.44
Divide both side by 4588
C = 2761.44 / 4588
C = 0.60 J/gºC
Thus, the specific heat capacity of the metal is 0.60 J/gºC
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What is a catalyst?
Group of answer choices
A. A substance that speeds up the reaction by increasing the activiation energy.
B. A substance added to the reaction that lowers the activation energy by providing an alternate pathway for the reactions to go to completion.
C. A substance that slows down the reaction by lowering the activation energy.
D. A substance added to the reaction that raises the activation energy by providing an alternate pathway for the reactions to go to completion.
A catalyst is a substance added to the reaction that lowers the activation energy by providing an alternate pathway for the reactions to go to completion.
A catalyst is a substance that accelerates a chemical response, or lowers the temperature or strain needed to begin one, with out itself being ate up at some stage in the response. Catalysis is the procedure of adding a catalyst to facilitate a response.
Catalysts may be categorized as homogeneous, heterogeneous, or enzymatic. Homogeneous catalysts exist inside the identical phase as the reactants, whereas heterogeneous catalysts exist in a exclusive section than the reactants.
Catalysts are basically categorised into 4 kinds.Homogeneous, Heterogeneous, Heterogenized homogeneous catalyst and Biocatalysts. Homogeneous catalyst: In homogeneous catalysis, reaction mixture and catalyst both are gift inside the equal segment.
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Which of the following best describes the interaction between water molecules?
Group of answer choices
A. Hydrogen Bonding
B. London Dispersion Forces
C. Dipole-Dipole Forces
D. Van der Waals Forces
Answer:
hydrogen bonding
Explanation:
I just think it is I am not sure
Answer: C. Dipole-dipole interactions.
please help!
Read the following passage.
Before Rutherford conducted the gold foil experiment, the "plum pudding" model proposed by J.J. Thomson offered an explanation for the structure of the atom. Rutherford, along with two of his associates Hans Geiger and Ernest Marsden, performed an experiment in which an extremely thin metal foil was fired with a beam of alpha particles. The results of the experiment were recorded accurately by another scientist who observed the frequency of alpha particles that passed through the foil unobstructed.
Use information from the passage to justify whether the characteristics of reliable scientific explanations are present in the development of the atomic theory. (8 points)
Characteristics of reliable scientific explanations are present in the development of the atomic theory in the given passage.
What is atomic theory?Atomic theory is the scientific theory that matter is composed of particles called atoms.
The discoveries of subatomic particles such as;
electron by J.J. Thomsonproton by Ernest Rutherfordneutron by James Chadwicknucleus by Ernest Rutherfordall contributed in the development of the atomic theory.
From the information given in the passage J.J. Thomson experiment gave rise to atomic model while Rutherford, Geiger and Ernest Marsden, performed the experiment that discovered nucleus and proton.
Thus, characteristics of reliable scientific explanations are present in the development of the atomic theory in the given passage.
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In order to dilute 40.0 mL of 0.600 M HCl to 0.200 M, the volume of water that would need to be added would be 200 mL. 80.0 mL. O 160 mL. 120 mL. 100 mL.
Answer:
80 ml
Explanation:
Moles to start = .04 L * .6 M/L = .024 moles
this is how much must be in the final dilution
.2 moles / liter * x liter = .024 moles
x = .024 / .2 = .12 liter final volume
start with . 040 then add .080 to get .12 liter
.080 liter = 80 ml
State whether the following liquids are miscible with water (H2O) by entering "yes" or "no".
1) Benzene, C6H6
2) Methanol, CH3OH
3) Chloroform, CHCl3
What mass (g) of solute is contained in 417 mL of a 0.327 M magnesium fluoride (MgF2) solution?
Answer: [tex]\Large\boxed{m=8.5~g}[/tex]
Rounded to the nearest 2 significant figures
Explanation:
Given information
Volume of Solution = 417 mL
Molarity of Solution = 0.327 M (mol / L)
Given molecular weight
Mg (Magnesium) = 24 g / mol
F (Flourine) = 19 g / mol
Total Weight (MgF₂) = 24 + 2 × 19 = 62 g /mol
Given formula
m = V × M × n
m = massV = VolumeM = Molarityn = molar mass (molecular weight)Convert the unit of volume to Liter
1 L = 1000 mL
417 mL = 417 / 1000 = 0.417 L
Substitute values into the given formula
m = (0.417) × (0.327) × (62)
Simplify by multiplication
m = 136.359 × 62
[tex]\Large\boxed{m=8.5~g}[/tex]
Hope this helps!! :)
Please let me know if you have any questions
How many grams of Nitrogen gas are found in 22.4 L of Nitrogen gas?
Group of answer choices
A. 20 g
B. 14 g
C. 56 g
D. 28 g
Answer:
The answer is 28 gram.
28 gram of Nitrogen gas are found in 22.4 l in Nitrogen gas
please answer the question so i can make sure I got them right! thank you :)
pH = pKa + log [conj.base]/[acid]
Let the concentration of the conjugate base = x
=> The concentration of the acid is also x (As the acid concentration is equivalent to that of the conjugate base)
for CH₃COOH=0.50 M and CH₃COO=0,25 M
pH = pKa + log [salt]/[acid]
pKa = -log Ka = -log 1.8x10-5 = 4.74
pH = 4.74 + log (0.50 M/1.0 M) = 4.74 + log 0.5 = 4.74 + (-0.3)
pH = 4.74 - 0.3
pH = 4.44
For0.20 M Na2CO3
pH=−log[H+]
=−log (1.54×10−12)
=11.8
for HNO₂
Kb = 2.17X10^-11 = x^2 / 0.148
x = [OH-] = 1.79X10^-6
pOH = 5.747
pH = 14.000 - pOH = 8.253
for HPO₄³⁻
= [HPO₄³⁻] [PO₄³⁻] [H +]/×10⁻³
=[PO₄³⁻]5.464×10⁻¹⁸
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A sample of carbon dioxide occupies 200 L at 22°C and 1.0 atm. At what temperature will
it expand to 1000 L at 0.90 atm?
Answer:
1328 K or 1055 °C
Explanation:
To find the new temperature, you need to use the Combined Gas Law:
P₁V₁ / T₁ = P₂V₂ / T₂
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. After converting the temperature (T₁) from Celsius to Kelvin, you can plug the values into the equation and simplify.
P₁ = 1.0 atm P₂ = 0.90 atm
V₁ = 200 L V₂ = 1000 L
T₁ = 22 °C + 273.15 = 295.15 K T₂ = ? K
P₁V₁ / T₁ = P₂V₂ / T₂
(1.0 atm)(200 L) / 295.15 K = (0.90 atm)(1000 L) / T₂
0.6776 = (0.90 atm)(1000 L) / T₂
(0.6776) x T₂ = (0.90 atm)(1000 L)
(0.6776) x T₂ = 900
T₂ = 1328 K
T₂ = 1055 °C
How to calculate the exact molarity of phosphoric acid using the first equivalence point with the use of Diprotic and Triprotic Ka's?
As we know that the equivalency point of moles of added base will be equal to the moles of original acid, this allows to determine the number of moles of original acid.
How do you find the concentration at the first equivalence point?At the equivalency point the moles of added base will be equal to the moles of original acid, this allows the determination of the number of moles of original acid. This can be combined with the original volume of the analyte solution in order to determine its concentration.
So we can conclude that at the equivalence point the moles of added base will be equal to the moles of original acid, this allows the determination of the number of moles of original acid.
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Which best explains the effect of chemicals on the environment?
O A. Chemicals are only harmful to the environment.
OB. Chemicals do not affect the environment.
C. Chemicals are only helpful to the environment.
OD. Chemicals can be helpful or harmful to the environment.
The best effect of chemicals on the environment is that Chemicals can be helpful or harmful to the environment.
Environmental chemical compounds seek advice from a chemical compound or chemical element present in air, water, meals, soil, dust, or other environmental media which includes customer merchandise.
Chemical substances can be toxic due to the fact they are able to harm us after they enter or touch the frame. exposure to a poisonous substance together with fuel can have an effect on your fitness. due to the fact that drinking gas can motive burns, vomiting, diarrhea and, in very huge amounts, drowsiness or dying, it's far poisonous.
Nutrient loading from over-fertilization can bring about runoff that causes damaging consequences in aquatic ecosystems. sizable publicity to, or misuse of, insecticides can damage non-centered plants and animal, as well as lead to improvement of pesticide-resistant pest species.
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Jon's equation ____ support his claim that matter is conserved during the chemical reaction because the reactants contain ____ ___ atom(s) compared to the products and the reactants contain ____ atom(s) compared to the products.
Answer:doesn't one more. chlorine. one fewer. hydrogen
Explanation:
Jon's equation does support his claim that matter is conserved during the chemical reaction because the reactants contain the same number of atoms compared to the products.
In a balanced chemical equation, the total number of atoms of each element in the reactants must be equal to the total number of atoms of the same element in the products.
This is known as the law of conservation of mass, which states that matter cannot be created or destroyed during a chemical reaction.
As long as the equation is balanced, showing the same number of atoms on both sides, it confirms that matter is conserved throughout the reaction, supporting Jon's claim.
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The volume of a gas at 0 degrees Celsius is 100 L. If the volume of the gas is increased to 200 L at a constant temperature, what is the new temperature of the gas in Kelvin?
The new temperature of the gas in Kelvin, given the data from the question is 273 °C
Data obtained from the questionFrom the question given above, the following data were obtained:
Initial volume (V₁) = 100 LInitial temperature (T₁) = 0 °C = 0 + 273 = 273 KPressure = ConstantNew volume (V₂) = 200 LNew temperature (T₂) =? How to determine the new temperatureThe new temperature of the gas can be obtained by using the Charles' law equation as illustrated below:
V₁ / T₁ = V₂ / T₂
100 / 273 = 200 / T₂
Cross multiply
100 × T₂ = 273 × 200
Divide both side by 100
T₂ = (273 × 200) / 100
T₂ = 546 K
Subtract 273 to obtain answer in °C
T₂ = 546 – 273 K
T₂ = 273 °C
Thus, new temperature of the gas is 273 °C
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The following reaction: HF(aq) <--> H+(aq) + F-(aq) has an equilbirum constant (K) value of 7.2 x 10-4. This means that the reaction proceeds essentially to completion.
Group of answer choices
True
False
Given an equilibrium constant value of 7.2 x 10-4 it is false to say that the reaction proceeds essentially to completion.
What is the equilibrium constant?In a reaction, we can judge using the value of the equilibrium constant weather or not the reaction moves on to completion. If the reaction moves up to completion, it the follows that the value of the equilibrium constant ought to be large.
On the other hand, when we have a case that the equilibrium constant is small and is not so large, then the reaction does not proceed essentially to completion.
Given an equilibrium constant value of 7.2 x 10-4 it is false to say that the reaction proceeds essentially to completion.
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Given the reaction
2 HI(g) <--> H2(g) + I2(g)
At 430 degrees Celsius, the equilibrium concentrations are [HI] = .5M, [H2] = 0.5 M, and [I2] = 1.5 M. What is the equilibrium constant (K)?
Group of answer choices
A. K = 3
B. K = 1.5
C. K = 0.33
D. K = 0.67
From the calculation, the equilibrium constant is obtained as 3. Option A
What is the equilibrium constant?The term equilibrium constant shows the extent to which we could see the conversion of the reactants to products in a reaction system. Now we know that the equilibrium constant can be obtained by the use of the formula;
K = [H2] [I2]/[HI]^2
Now we have that at equilibrium;
[H2] = 0.5 M
[I2] = 1.5 M
[HI] = 0.5M
It then follows that;
K = 1.5 * 0.5/( 0.5)^2
K = 3
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How many grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution?
Group of answer choices
A. 1.05 grams NaOH
B. 42,000 grams NaOH
C. 42 grams NaOH
D. 1050 grams NaOH
42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution (option C).
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles of NaOH can be calculated using the following formula;
Molarity = no of moles ÷ volume
no of moles = 0.250L × 4.2 = 1.05mol
Hence, the mass of NaOH can be calculated as follows:
mass = 1.05 mol × 40g/mol = 42g
Therefore, 42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution.
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Convert the following measurement
The correct answer would be 0.034 g/L.
Unit conversionWhat we are trying to do here is to convert from milligram to gram and from deciliter to liter.
First, let's do the milligram to gram conversion.
1 mg = 0.001 g
Therefore,
3.4 mg = 3.4 x 0.001 = 0.0034 g
In order to convert from deciliter to liter.
1 deciliter = 0.1 L
Thus, 3.4 mg/dL = 0.0034g/0.1 L = 0.034 g/L
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Which pair shares the same empirical formula? (4 points)
C2H4 and C6H6
C6H6 and C3H3
CH2 and C6H6
CH and C2H4
Considering the definition of empirical and molecular formula, the pair C₆H₆ and C₃H₃ shares the same empirical formula.
Empirical formulaThe empirical formula is the simplest expression to represent a chemical compound, and indicates the elements that are present and the minimum proportion in whole numbers between its atoms. This formula is also known as the “minimum formula”.
That is, the empirical formula is the expression of the simplest ratio between the atoms of a chemical compound and indicates the different elements that make up the molecule and the relationship between them. But it does not indicate the actual formula of the compound.
Molecular formulaThe molecular formula is the actual formula of the molecule, it tells us the types of atoms and the number of each type that participate in the formation of the molecule.
Same empirical formula in this caseIn this case, the pair C₆H₆ and C₃H₃ shares the same empirical formula. In the first case, the ratio of carbon atoms to hydrogen atoms is 6:6 or 1:1, while in the second case said ratio is 3:3 or 1:1. Therefore, the relationship is the same, so they have the same empirical formula.
In summary, the pair C₆H₆ and C₃H₃ shares the same empirical formula.
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What is the structure of polypropylene
The Structure of polypropylene(C3H6)n is linear.
The chemical formula for polypropylene is (C3H6)n.It is a polymer with complex structure and also known as polypropene. Polypropylene is similar to polyethylene which belongs to polyolefin groups. Generally the polymers are synthesized from the polymerization process.What is polymerization?The process in which atom or small molecules joined together repeatedly to form a polymer with complex structure is called as polymerization.
The repeated unit of atom or small molecule is called monomer
Structure of polypropylenePolypropylene is synthesized from the polymerization of propylene which is the monomer unit.
It has a linear structure made of propylene hydrocarbon units.
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Write equations that show NH3 as both a conjugate acid and a conjugate base.
Answer:
hope this helps
Explanation:
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Give the answer the problem below to the correct number of significant figures. Explain your results.
(329.5/0.45)-23.2
The correct number of significant figures gotten from the result of (329.5/0.45)-23.2 is infinite because there is no uncertain digit as a result of the answer being 709.022222222 when calculated.
What is a Significant figure?These refers to the digits which contributes to the degree of accuracy of a value and is usually counted starting from the non zero digits. In cases where the zero is between other numbers it is regarded as being significant such as 70.0111 in which the number of significant figures is six.
The result gotten from the expression (329.5/0.45)-23.2 is 709.022222222 which has a recurring decimal thereby making it difficult to calculate the number of recurring decimal.
Therefore it has infinitely many significant figures because there is no uncertain digit.
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select the common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous
The common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous is caution.
What are hazardous statements?Hazardous statements are those words or phrases that are labelled against chemicals which shows the degree of how dangerous the chemical are.
The common words that are used as hazardous statements which shows that a chemical is dangerous include the following:
Danger,Caution andWarning.Therefore, the common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous is caution.
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Which of the following materials is the least porous?
loosely packed gravel
unsorted sand and rock
large pebbles and boulders
sorted sand and rock
Answer:
The answer is The unsorted sand and rock is the least porous.
Answer:
large pebbles and boulders
Kendra knew from science class that water freezes at 0°C. She started to wonder
about the freezing points of other clear liquids. She decided to conduct an
experiment using vinegar, rubbing alcohol, and bleach. She pours 50 mL of each
liquid into three plastic containers that are all the same. She puts them in the freezer
at the same time and places the same brand thermometer in each liquid. Kendra
checks the temperatures every ten minutes and records her observations in her
journal.
Independent Variable:
Dependent Variable:
Three Control Variables:
YesYes , the water freezes at 0°C and every substance has it's own freezing points.
What is Freezing point ?The temperature at which a liquid solidify.The temperature at which the liquid and solid substance are in equilibrium at atmospheric pressure: melting point of water is 0°Celsius or 32°Farenhiet.
The freezing point of alcohol will be -114°C .
The freezing point of Bleach will be 19°F .
The Freezing point of vinegar will be 28°F .
The freezing point of rubbing alcohol will be- 100°C .
So,every substance has it's own freezing point.
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