A liquid is cooled during an investigation causing it to solidify. Which of the following most likely occurred? 6 points
Answers
Answer:
A physical change
Explanation:
A physical change is a form of transformation in which an element or matter changes from one material state to another. For example from solid-state to liquid state through melting. Another is crushing and freezing.
Hence in this case, when a liquid is cooled during an investigation causing it to solidify. The process is called Freezing which occurred as a result of a PHYSICAL CHANGE.
Related Questions
A student is making tea on a cold day. When he tries to put honey in his tea, the honey will not flow out of the bottle. Describe how the student could make the honey flow out of the bottle more easily, and explain why your method would work.
Answers
Answer:
Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle
Explanation:
Which of the following is NOT a common property of water?
o Water has high surface tension.
o Water expands when it freezes.
o Ice is less dense than water.
o Water has low heat of vaporization.
Answers
Answer:
A = water has high surface tension
the answer is a hope this helps and plz give me brainlist :)
What is the volume, in liters, of 0.23 moles of carbon monoxide at STP
Answers
Using dimensional analysis, how many kilometers are there in 34 inches?
Answers
Answer:
There are many ways to figuring this out: you could use a ruler, a calculator or scrap paper.
Explanation:
This is not an actual flat out answer, but it’s helpful methods to getting the answer the next time you are stuck. Hope you are having a nice day. Bless your heart and soul.
you are provided a mixture of three peptides in hepes buffer at ph 7.55. kcwrr (pi = 12.01) dhede (pi = 3.91) ywifw (pi = 5.52) which would bind tightest to a hydrophobic interaction column?
a. Peptide 2
b. Peptide 3
c. Peptide 1
Answers
The peptide that would bind the tightest to a hydrophobic interaction column would be Peptide 1, or KCWRR.
This is because this peptide has the highest isoelectric point (pI) of the three peptides, with a pI of 12.01. The higher the pI of a peptide, the more hydrophobic it is, meaning that it will have a stronger interaction with the hydrophobic column.
Peptide 2 (DHEDE) has a pI of 3.91 and Peptide 3 (YWIFW) has a pI of 5.52, both of which are lower than Peptide 1's pI. This means that these two peptides are less hydrophobic and will have a weaker interaction with the hydrophobic column.
Therefore, the correct answer is c. Peptide 1.
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dalton supported his atomic theory with experimental evidence. what experiment would have supported the postulate that in chemical reactions, atoms are combined, separated, or rearranged
Answers
In 1803 Dalton discovered that oxygen combined with either one or two volumes of nitric oxide in closed vessels over water and this pioneering observation of integral multiple proportions provided important experimental evidence for his incipient atomic ideas.
In closed vessels over water, Dalton observed in 1803 that oxygen interacted with either one or two volumes of nitric oxide. This ground-breaking observation of integral multiple proportions offered crucial experimental support for his developing atomic theories.
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As the temperatures increase density generally ?
A. Increase
B. Decrease
C. Remain same
Answers
Beverly and Carl are in a race. Their graphs show the data.
A graph with horizontal axis time (seconds) and vertical axis velocity (meters per second). An orange line labeled Beverly starts at 0 seconds 0 meters and goes straight to 10 seconds 15 meters and then to 50 seconds 35 meters. A blue line labeled starts at 0 seconds 0 meters and goes straight to 10 seconds 10 meters and then to 50 seconds 30 meters.
Which best describes the race?
Answers
Given the data, the correct statement is
Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s
What is acceleration?This is defined as the rate of change of velocity which time. It is expressed as
a = (v – u) / t
Where
a is the acceleration v is the final velocity u is the initial velocity t is the time How to determine the initial acceleration of BeverlyInitial velocity (u) = 0 m/sFinal velocity (v) = 15 m/sTime (t) = 10 sInitial acceleration (a₁) =?a₁ = (v – u) / t
a₁ = (15 – 0) / 10
a₁ = 1.5 m/s²
How to determine the final acceleration of BeverlyInitial velocity (u) = 15 m/sFinal velocity (v) = 35 m/sTime (t) = 50 - 10 = 40 sFinal acceleration (a₂) =?a₂ = (v – u) / t
a₂ = (35 – 15) / 40
a₂ = 0.5 m/s²
How to determine the initial acceleration of CarlInitial velocity (u) = 0 m/sFinal velocity (v) = 10 m/sTime (t) = 10 sInitial acceleration (a₁) =?a₁ = (v – u) / t
a₁ = (10 – 0) / 10
a₁ = 1 m/s²
How to determine the final acceleration of CarlInitial velocity (u) = 10 m/sFinal velocity (v) = 30 m/sTime (t) = 50 - 10 = 40 sFinal acceleration (a₂) =?a₂ = (v – u) / t
a₂ = (30 – 10) / 40
a₂ = 0.5 m/s²
SUMMARY
Initial acceleration of Beverly = 1.5 m/s²Final acceleration of Beverly = 0.5 m/s²Initial acceleration of Carl = 1 m/s²Final acceleration of Carl = 0.5 m/s²From the above calculations, we can see that Beverly's initial acceleration is higher than that of Carl's and their final acceleration is the same.
Therefore, the correct answer to the question is:
Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s
Complete question
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Answer:
B) hope this helped.
-----------------------------
on edgy 2022
Explanation:
Since protons (p+) with a positive charge and neutrons (n0) without a charge are located in the nucleus, what is the overall charge of the nucleus portion of an atom: positive, negative, or no charge at all? Explain.
Answers
Answer:
Positive
Explanation:
The nucleus of an atom has a net positive charge which is balanced by the negative charge of the electrons residing in the orbital of an atom. The reason why the nucleus of an atom is positively charged is because it contains two sub atomic particles;
The protons and neutrons. In terms of charge, the proton is positively charged and the neutron is neutral. This means the neutron does not partake in the charge of the nucleus. Hence the net charge of the nucleus is decided by the protons which are positively charged
A sample containing 27. 0 moles of propane gas at a temperature of 25. 0 °C is stored in a 12. 5 liter cylinder. What is the pressure of the gas inside the cylinder?
Answers
The pressure of the gas inside the cylinder is 52.90 atm
Given is the number of moles of gas, the temperature and the volume of the gas and we need to find the pressure of the gas inside the cylinder, for this we can use the ideal gas law equation:
PV = nRT
Where:
P = Pressure of the gas (in units of pressure, such as atm)
V = Volume of the gas (in liters)
n = Number of moles of the gas
R = Ideal gas constant (0.0821 L·atm/(mol·K))
T = Temperature of the gas (in Kelvin)
First, let's convert the temperature from Celsius to Kelvin:
T = 25.0 °C + 273.15 = 298.15 K
Now we can substitute the values into the ideal gas law equation:
P × 12.5 L = 27.0 moles × 0.0821 L·atm/(mol·K) × 298.15 K
Simplifying the equation:
P × 12.5 L = 661.2587 L·atm
Dividing both sides by 12.5 L:
P = 661.2587 L·atm / 12.5 L
P ≈ 52.90 atm
Therefore, the pressure of the gas inside the cylinder is approximately 52.90 atm.
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We can use the ideal gas law equation to determine the pressure of a gas within a cylinder:
PV = nRT
Where:
P is the pressure of the gas (in units of pressure, such as atm)
V is the volume of the gas (in units of volume, such as liters)
n is the number of moles of the gas
R is the ideal gas constant (0.0821 L·atm/(mol·K))
T is the temperature of the gas (in units of temperature, such as Kelvin)
we need to convert the temperature from Celsius to Kelvin:
T(K) = T(°C) + 273.15
T(K) = 25.0 °C + 273.15
T(K) = 298.15 K
Now we can plug the data into the ideal gas law equation as follows:
P * 12.5 L = 27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K
Simplifying the equation:
P = (27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K) / 12.5 L
Calculating the pressure:
P ≈ 5.046 atm
As a result, the gas inside the cylinder is under a pressure of about 5.046 atm.
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A sphere of radius 0.457 m, temperature 32.2 ∘
C, and emissivity 0.924 is located in an environment of temperature 82.9 ∘
C. At what rate does the sphere (a) emit and (b) absorb thermal radiation? (c) What is the sphere's net rate of energy exchange? (a) Number (b) Number Units Units
Answers
a) The sphere emits thermal radiation at a rate of 139.75 Watts.
b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.
c) The sphere's net rate of energy exchange is 102.09 Watts.
What are the rates of thermal radiation emission, absorption, and net energy exchange for the sphere?To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.
a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:
Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))
Plugging in the given values:
Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)
Emitting Rate ≈ 139.75 Watts
b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:
Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))
Plugging in the given values:
Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)
Absorbing Rate ≈ 37.66 Watts
c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:
Net Rate = Emitting Rate - Absorbing Rate
Net Rate = 139.75 Watts - 37.66 Watts
Net Rate ≈ 102.09 Watts
Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.
Note: The units for all the rates are Watts.
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Which group would we find the element of this
atom in?
group 8
group 2
group 6
group 5
Answers
manufacturers make vegetable oils solid or semisolid at room temperature by .
Answers
Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation. Hydrogenation involves the addition of hydrogen gas to unsaturated vegetable oils, resulting in the conversion of some of the unsaturated fats into saturated fats.
This process increases the melting point of the oil and transforms it into a solid or semisolid form.
During hydrogenation, vegetable oils are heated and mixed with a catalyst, typically a metal catalyst like nickel, in the presence of hydrogen gas. The unsaturated fats in the oil undergo a chemical reaction called hydrogenation, where the carbon-carbon double bonds in the fatty acid molecules are converted into single bonds. This saturation process reduces the overall degree of unsaturation in the oil and increases its stability and solidification properties.
The hydrogenated vegetable oils, commonly known as trans fats, have a higher melting point and are solid or semisolid at room temperature. This property makes them suitable for various food applications, such as margarine, shortening, and bakery products, where a solid or semisolid texture is desired. However, it is worth noting that the consumption of trans fats has been linked to adverse health effects, and many manufacturers are now moving towards healthier alternatives and reducing the use of hydrogenated oils in their products.
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Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation.
Hydrogenation involves adding hydrogen gas to vegetable oils in the presence of a catalyst, typically nickel or palladium. This process causes the unsaturated fats in the oils to undergo a chemical reaction, converting them into saturated fats.
Saturated fats have a higher melting point and are solid or semisolid at room temperature, unlike the liquid form of unsaturated fats. By hydrogenating vegetable oils, manufacturers can increase their stability, improve texture, and extend shelf life. This transformation allows vegetable oils to be used as margarine, shortening, or in the production of solid or semisolid food products like baked goods and spreads.
Therefore, it is important to note that hydrogenation can result in the formation of trans fats, which have been associated with negative health effects. To address this concern, many manufacturers are transitioning to alternative methods or using healthier oils in their products.
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20 POINTS AND BRAINLIEST OLEASE HELP
d. Given the orbital configuration of phosphorus, explain why phosphorus
forms 3 bonds in molecules such as PH3 and PC13. (1 point)
Answers
Answer:
The reason why phosphorus usually forms 3 bonds is because of its valence electrons. Phosphorus has 5 valence electrons and due to the octet rule, it will strive to gain 3 more in order to fill it outer shell and become stable. PH3 and PCI3 are great examples of this. In the compound PH₃, The phosphorus atom is in a covalent bond to three hydrogen atoms. Each of the three hydrogen atoms share their one valence electrons with phosphorus, and the phosphorus atoms shares one electron with each hydrogen atom. In the compound PCl₃, one phosphorus atom shares one electron with each chlorine atom, and each chlorine atom shares one electron with phosphorus. Note that each of these compounds are covalent bonds. As show, phosphorus forms 3 bonds because it needs 3 more electrons to become stable.
A balloon with a volume of 5.0 L is filled with a gas at 760 torr. If the pressure is reduced to 380 torr without a change in temperature, what will be the volume of the balloon?
Answers
Answer:
10 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
\(P_1V_1 = P_2V_2\)
Since we are finding the new volume
\(V_2 = \frac{P_1V_1}{P_2} \\\)
From the question we have
\(V_2 = \frac{5 \times 760}{380} = \frac{3800}{380} = \frac{380}{38} \\ \)
We have the final answer as
10 LHope this helps you
By applying Boyle's law, the final volume of this balloon is equal to 10,000 mL.
Given the following data:
Initial volume = 5.0 L.
Final pressure = 380 torr.
Initial pressure = 760 torr.
How to calculate the final volume?In order to determine the final volume of this balloon, we would apply Boyle's law.
Mathematically, Boyle's law is given by this formula:
PV = k
P₁V₁ = P₂V₂
Where:
P represents the pressure.V represents the volume.Making V₂ the subject of formula, we have:
V₂ = (P₁V₁)/P₂
Substituting the given parameters into the formula, we have;
V₂ = (760 × 5.0)/380
V₂ = 3800/380
V₂ = 10 L
In milliliters, we have:
1 L = 1000 mL
10 L = X mL
X = 1000 × 10
V₂ = 10,000 mL.
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Please help
A. giving 15.0 grams of N2, how many grams of NH3 would theoretically be produced
Answers
1) The theoretical yield is 18.02 g
2) The percent yield is 67%
3) The percent yield is 55.8 %
What is the theoretical yield?The balanced reaction equation is;
N2 + 3H2 ----> 2NH3
Number of moles of N2 = 15g/28 g/mol = 0.53 moles
If 1 moles of N2 produced 2 moles of NH3
0.53 moles of N2 will produce 0.53 * 2/1
= 1.06 moles
Theoretical yield = 1.06 moles * 17 g/mol
= 18.02 g
The percent yield = 12.1/18.02 * 100/1
= 67%
The percent yield = 19.8 g/35.5 g * 100/1
= 55.8 % as shown
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please help!! i do NOT understand chemsitry at all
Answers
Answer:
pretty sure there is a calculator
Explanation:
there is a calculator for it ( that's what I do ) btw there is a calculator for every even science or chemistry
A student was testing an unknown element to see if it was a metal or non metal. The element was solid, dull in appearance, very brittle , and conducted electricity. What was this unknown element?
Answers
Answer:
The element was one of the alkaline metals, the dull appearance comes from the metal reacting with oxygen and oxidizing its outer surface as alkaline are known for their enormous reaction with oxygen in the air and water.
Another ability of this group of elements is the ability to conduct electricity. And they are also easy to cut with a kitchen knife.
As you move across the periodic table, from left to right, atoms tend to get smaller
because,
(0.5 Points)
they have more mass
they have less mass
they have more protons.
they have less electrons.
Answers
Explanation:
because they have more protons
A sample of gas is stored at 15 atmosphere and has a volume of 5 liters.If the volume of the gas is reduced to 3 liters,what will the new pressure be?
Answers
The new pressure will be : 25 atm
Further explanationBoyle's Law
At a constant temperature, the gas volume is inversely proportional to the pressure applied
\(\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}\)
P₁=15 atm
V₁=5 L
V₂= 3 L
\(\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_1=\dfrac{15~atm\times 5~L}{3~L}\\\\P_1=\boxed{\bold{25~atm}}\)
You've probably heard the saying "two heads are better than one." In the Discussion Board, you and your classmates will apply the
principle behind this saying, sharing thoughts and ideas that will help you see the big picture" of what you're learning. If you give this activity your all, it will be easier for you to see how concepts in science connect to a variety of topics outside of this course, such as politics, economics, and social issues. The Discussion Board is a tool that will help you better grasp why the content you are learning matters.
Choose a fact or concept from the lesson that you can apply in your life. Describe the fact or concept, and explain how you will apply it.
Answers
Choose a fact or concept from the lesson that you can apply in your life. Describe the fact or concept, and explain how you will apply it.
Answer: For Primavera integrated science
A fact is this, we all have a lot of issues in life, but we need to stay as positive as possible about it.
Explanation:
In life a lot of bad things will happen to us. These things can be very negative at time's and make life harder. We should attempt to remain as positive about the situation as possible. This will enable us to be in a better headspace about whatever has happened to us and give us more mental room to breath.
Two heads are better than one is the phrase which means that advice from a second person can be helpful. The concept of the issues and positivity can be taken.
What are negativity and positivity?Negativity is the pessimism that criticizes something around a person. Positivity is the optimistic attitude or the positive approach towards a person or something.
An individual faces a lot of challenges and issues in his life that can be dealt with a positive approach. A lot of bad things occurring in a person's life can negatively affect the person making their life harder.
Being positive in a bad situation will enable a person to remain calm to solve the problems and will give him more mental peace.
Therefore, "two heads are better than one."
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How many grams of NH3
form when 22.3 L
of H2(g)
(measured at STP) reacts with N2
to form NH3
according to this reaction?
N2(g)+3H2(g)→2NH3(g)
Answers
Answer:
11.2823 grams of NH3 are produced
Explanation:
No. of moles for H2 = 22.3/22.4 = 0.9955 moles
By calculating number of moles produced of NH3, by using ratios:
N2 + 3H2 → 2NH3
1 : 3 : 2
? : 0.9955: ?
part value = 0.9955/3 = 0.33183
No. of moles for NH3 = 2 * 0.33183 = 0.6637 moles
mass of produced NH3 (Molar mass = 17 g/mol) = 0.6637*17 = 11.2823 grams
Why is there not a constant molar volume for solids and liquids?
a Solid and liquid particles are packed close together.
b The densities of solids and liquids are variable.
C The volume of a solid or a liquid has very little empty space.
d All of the above
Answers
Answer:D
Explanation:
what is 2.5 meters= to mm
Answers
Answer:
2500 mm
Explanation:
2.5 m = 2.5 * 1000 = 2500 mm
Answer:
2500 mm
Explanation:
1 metre = 1000mm
Now,
2.5 metre = 2.5*1000 mm
= 2500 mm
What is the number of protons, neutrons, and electrons in the following isotopes?
Answers
Answer:
SR: no. of protons=38no. of neutron=51
2. Cr: no. of protons= 24
no. of neutron=28
3. S: number of protons=16
number of neutrons =16
4. BR : number of proton=35
number of neutron =46
Explanation:
In the given questions;
the numerator is atomic mass and in denominator there is atomic number.
Which of the definitions below is best for the word molecule? Atoms of different elements chemically joined together More than one atom chemically joined together A type of compound More than one atom of the same type chemically joined together A group of atoms together
Answers
Answer: More than one atom of the same type chemically joined together
Explanation:
An atom is the smallest unit of any matter which may or may not have independent existence. Example: Argon (Ar) is an element which exist as Ar atom only.
Molecule is the smallest unit of any matter which always have independent existence. For example: Hydrogen (H) is an element which can exist in nature as \(H_2\) molecule only.
Atoms of different elements chemically joined together is called as a compound. Example: \(H_2O\) is a compound formed by chemical combination of hydrogen (H) and oxygen (O) atom.
A student makes several observations about a plece of iron. Which observation describes a chemical property of the Iron?
Answers
Answer:rust
Explanation:
what should you expect to observe when the ingredients in an antacid react with hcl to produce h2co3
Answers
When antacid reacts with HCl to produce H2CO3 it produce fizzy gas react due to a double displacement reaction.
Table salt and carbonic acid are produced in a two fold displacement process when hydrochloric acid and antacid are combined. Additionally, due to the instability of carbonic acid, it will decompose into water and carbon dioxide, emitting a "fizzy" gas.
Strong acid hydrochloric acid is denoted by the chemical formula HCl. The primary ingredient in antacids is sodium bicarbonate, sometimes known as baking soda and has the chemical formula NaHCO3.
Antacid undergoes a chemical reaction when it reacts as a carbonate with powerful acids like hydrochloric acid to create compounds with a different chemical makeup from the beginning components. Similar reactions will be produced by other carbonates, such as calcium carbonate, which makes up the majority of Tums.
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Can somebody help me?
Answers
Answer:
it belongs to alakli metals
hope it helps
pls mark me as brainlliest
Answer:An element which is highly conductive, highly reactive, soft, and lustrous is most likely an alkali metal.
Explanation:Alkali metals are in group 1 of the Periodic table which means that they have only a single valence electron.
This causes them to be soft and highly reactive because:
The single valance electron leads to weak bonds amongst the element's atoms which makes them soft
The elements want to lose the single valance electron so as to become stable so they will react with other elements to give away the electron.
Examples of alkali electrons include:
Lithium
Sodium
Potassium etc
In conclusion therefore, alkali metals are highly reactive and soft and so the element described above is most likely an alkali metal.
what is the molarity of calcium hydroxide if 15 ml of the solution is neutralized by 15.8 ml of. 90M phosphoric acid
Answers
The molarity of calcium hydroxide if 15 ml of the solution is neutralized by 15.8 ml of. 90M phosphoric acid is 0.22 M.
How to calculate molarity?The balanced chemical equation for the reaction between calcium hydroxide and phosphoric acid is:
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + 2H₂O
The molar ratio of calcium hydroxide to phosphoric acid is 1:3.
The volume of the phosphoric acid solution is 15.8 mL and the molarity of the phosphoric acid solution is 0.90 M.
Use the following equation to calculate the moles of phosphoric acid:
moles of H₃PO₄ = molarity × volume
moles of H₃PO₄ = 0.90 M × 15.8 mL
moles of H₃PO₄ = 14.22 mmol
Since the molar ratio of calcium hydroxide to phosphoric acid is 1:3, the moles of calcium hydroxide is 1/3 of the moles of phosphoric acid.
moles of Ca(OH)₂ = moles of H₃PO₄ / 3
moles of Ca(OH)₂ = 14.22 mmol / 3
moles of Ca(OH)₂ = 4.74 mmol
Use the following equation to calculate the molarity of calcium hydroxide:
molarity of Ca(OH)₂ = moles of Ca(OH)₂ / volume
molarity of Ca(OH)₂ = 4.74 mmol / 15 mL
molarity of Ca(OH)₂ = 0.28 M
Therefore, the molarity of calcium hydroxide is 0.22 M.
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