Which statement best describes why a chemical change is different from a physical change?
A chemical change is used to identify characteristics of a substance, and a physical change identifies the behavior of a substance when in a reaction.
A chemical change results in a new substance being formed, whereas a physical change will result in a different state of matter.
A chemical change results in a different state of matter, and a physical change results in a new substance being formed.
A chemical change is used by scientists to create new substances, and a physical change happens naturally.
Answer:
A chemical change results in a new substance being formed whereas a physical change will result in a different state of matter
which of the following substance is most likely basic
Answer:
Please provide answer options. :)
draw the additional resonance structure s of the structure below
The electronic bonding, including fractional bonds and fractional charges, of a single polyatomic species is collectively represented by resonance structures, which are a collection of two or more Lewis structures.
Resonance structures are two types of molecules where the chemical interaction is the same but where the distribution of electrons varies across the structure. Resonance happens when electrons can move between two opposing pi configurations.
Resonance is a term used in valence bond theory to describe how different contributing structures (or forms, also known as resonance structures or canonical structures) come together to generate a hybrid resonance (or hybrid structure) in certain molecules or ions.
Resonance is what you'll experience if the frequency matches the object's resonant frequency, which it does. When the vibrations of one object cause the frequency of its oscillations to increase, this is known as resonance.
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Calculate how much heat energy is absorbed by 125 g of water if the water temperature increases from 22.5 °C to 30 °C. The specific heat for water is
4.18J/g °C.
A. 69.7 J
B. 224 J
C. 3.9 J
D. 3,900 J
Answer:
c
Explanation:
Which of the following would be a value measured using a scale in lab?
O Actual yield
O Percent yield
O Theoretical yield
O Molar ratio
Answer:
A. Actual Yield
Since all of the others are calculated not measured outright.
Give the name, atomic symbol, and group number of the element with each Z value, and classify it as a metal, metalloid, or nonmetal:
(e) Z = 13
The name of the element is Aluminum, atomic symbol Al and it belongs to group 13. Aluminum is metal.
What is Metal and Non-Metal?Metal loses electrons easily. Metals are less electronegative. Non metal cannot loses its electrons easily. Non-metals are more electronegative.
What is groups and periods in Periodic table ?In periodic table 18 vertical column are present which is called groups which are arranged from left to right in the periodic table. In periodic table 7 horizontal rows are present which is called periods.
Aluminum is a chemical element which belongs to the group 13 and period 3. Aluminum is metal which is soft and malleable.
Thus from the above conclusion we can say that The name of the element is Aluminum, atomic symbol Al and it belongs to group 13. Aluminum is metal.
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An old refrigerator is rated at 500 W how many kilowatt hours of electric energy what does refrigerator use in 30 days assume the refrigerator is running 12 hours per day
The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.
Given:
Power rating of the refrigerator = 500 W
Running time per day = 12 hours
Number of days = 30
First, we need to convert the power rating from watts to kilowatts:
Power rating = 500 W / 1000 = 0.5 kW
Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:
Energy used = Power rating × Running time × Number of days
Energy used = 0.5 kW × 12 hours/day × 30 days
Energy used = 180 kWh
Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
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In DNA replication, what is the leading strand? A. the strand that is unzipped at the replication fork B. the strand that assembles new nucleotides in a continuous fashion C. the strand that does not assemble new nucleotides in a continuous fashion D. the strand that waits for the DNA replication process to be finished
Answer:
B
Explanation:
Answer: B.) the strand that assembles new nucleotides in a continuous fashion
Explanation: edgenuity
a chemical reaction where heat is absorbed is called
A chemical reaction where heat is absorbed is called an endothermic reaction.
What is an endothermic reaction?
An endothermic reaction is a type of chemical reaction in which heat is absorbed from the surroundings, resulting in a decrease in temperature. This means that the energy required for the reaction to occur is supplied by the environment, and the products of the reaction have a higher energy than the reactants. Examples of endothermic reactions include the dissolving of ammonium nitrate in water and the reaction between baking soda and vinegar.
The formula for the enthalpy change, or heat of reaction (ΔH), for an endothermic reaction is: ΔH = heat absorbed by the reaction (positive value)
The enthalpy change is typically represented in units of energy per mole of reactant, such as joules per mole (J/mol) or calories per mole (cal/mol). The sign of ΔH is positive for endothermic reactions, since heat is absorbed by the reaction.
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A student claims that the reaction is first order with respect to F2(g). Do you agree or disagree? Justify your answer using the data above. 1b. What is the initial rate of disappearance of F2(g) in trial 3? Justify your answer. 2a. Calculate the average rate of disappearance of NH3 between 0 and 1.54 x 10^2 s. Use this calculated rate to determine the rate of appearance of H2 over the same time period. 2b. What are the rates of disappearance of NH3 ad rate of appearance of H2 between the times 1.54 x 10^2 and 4.83 x 10^2 s?
The reaction is a second order reaction, the rate with respect to F2 is 40 * 10 ^-4 torr/min and the molecular geometry is square planar.
The Rate of ReactionRate of Reaction;
rate = k[D]^a [f2]^b
The coefficient of DFu = 1
The rate of reaction = - rate of DFu
Let's add the values of trial (i) and (ii) and dividing (i) by (ii)
\(\frac{5.0*10^-^3}{10.0*10^-^3} = \frac{k[1500]^a[1500]^b}{k[3000]^a[1500]^b} \\\frac{1}{2} = [\frac{1}{2}] ^a\\a = 1 ...eq(i)\)
similarly for trial (i) and (iii)
\(\frac{5*10^-^3}{20*10^-^3}= \frac{k[1500]^a[1500]^b}{k[1500]^a[3000]^b} \\ \frac{1}{4} = [\frac{1}{2}]^b\\ b = 2 ...eq(ii)\)
The rate of the reaction is
\(Rate = k[D]{F_2]\\\)
a).
I will disagree because from rate equation above, it is a second order with respect to F2.
b).
As the rate of reaction or rate of formation of FDu in trial (iii) is
\(20*10^-^4\)
From equation of reaction
\(D + 2f_2 \to DFu\)
The rate with respect to F2
\(2 * 20 * 10^-^4 = 40 * 10 ^-^4 torr/min\)
c).
DFu
D has 8 valance electrons which is group 18
This would mean that D has 4 bonds pair and 2 lone pair. This is at
\(AB_uX_2\)
x = lone pair
The molecular geometry = square planar
Which is i agree to this.
The reaction is a second order reaction, the rate with respect to F2 is 40 * 10 ^-4 torr/min and the molecular geometry is square planar.
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Select the correct answer. Which electromagnetic wave has the longest wavelength? microwaves O B. infrared rays O C. X-rays radio waves
Answer:
microwaves
Explanation:
Microwaves and radio waves are the longest wavelengths while the shortest are gamma rays and x-rays
claudia performed a flame test in her lab. the result of her flame test is shown here. what scientific questions could claudia ask about the flame? check all that apply. what element causes this flame color? is this the prettiest flame color? will the flame color change if another element is added? will changing the temperature affect the flame color? which flame test does the class like the best?
The scientific questions Claudia can ask about the flame test are (A), (C), and, (D).
The flame test is used to find sure factors, which on heating deliver a particular colour to the flame.
clinical questions are extraordinary from regular questions as they've a prior goal and need to be testable.
a very good scientific question is absolutely reality-primarily based and may be answered through experiment or using previous evidence.
three principal kinds of clinical questions are Verification questions, size, or statement-based totally facts series, which include specific capabilities of an organism or phenomenon.
The clinical questions Claudia ask is-
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Elemental sulfur is one of the products of the gas-phase reaction of nitric acid and hydrogen sulfide. The other
products are nitrogen monoxide(g) and water(g). A
container and hydrogen sulfide (s) are massed and found to
be 23.3 g. To this container 8.50 L of nitric acid gas was
introduced. After the reaction the solid was extracted and
found to weigh 16.8 g. (mass of container is 5.10g )
Based on this result find:
a. the percent yield of the solid product
b. the amount of the other products produced
c. the name of the solid produced
Answer:
The manufacturing processes for liquefied petroleum gas are designed so that the majority, if not all, of the sulfur compounds are removed. The total sulfur level is therefore considerably lower than for other crude oil-based fuels and a maximum limit for sulfur content helps to define the product more completely. The sulfur compounds that are mainly responsible for corrosion are hydrogen sulfide, carbonyl sulfide and, sometimes, elemental sulfur. Hydrogen sulfide and mercaptans have distinctive unpleasant odors. A control of the total sulfur content, hydrogen sulfide and mercaptans ensures that the product is not corrosive or nauseating. Stipulating a satisfactory copper strip test further ensures the control of the corrosion.
What is the mass of 1.50 x 10^15 N
Mass =
\(\frac{force}{gravitational \: force}\)
\(mass = \frac{1.50 \times 10^{15}n }{9.8m.s^{2} } \\ = 1.53 \times 10^{14} kg\)
Consider the energy diagram below.
Which line indicates a higher reaction rate?
A because it has a lower activation energy.
B because it has a lower activation energy.
A because it’s Grxn is much lower
B because it’s Grxn is much lower
Select the correct answer. which substance in this redox reaction is the oxidizing agent? cu 2agno3 → 2ag cu(no3)2 a. n b. agno3 c. cu d. no3− e. cu(no3)2
AgNO₃ will act as the oxidising agent.
For the given chemical equation:Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂
Half reactions for the given chemical reaction:
Reducing agent:
Cu → Cu²⁺ + 2e⁻
Copper is a reducing agent because it is losing 2 electrons, which causes an oxidation process.
Oxidising Agent:
Ag⁺ + e⁻ → Ag
The silver ion undergoes a reduction process and is regarded as an oxidizing agent since it is acquiring one electron per atom.
Hence, AgNO₃ is considered as an oxidizing agent and therefore the correct answer is Option B.
Oxidising and Reducing agentsAn oxidizing agent is a substance that reduces itself after oxidizing another material. It passes through a reduction process in which it obtains electrons and the substance's oxidation state is decreased.A reducing agent is a chemical that oxidizes after reducing another material. It passes through an oxidation process in which it loses electrons and the substance's oxidation state increases.To know more about the process of Oxidation and Reduction, refer to:
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If a piece of iron is weighed, allowed to go rusty, and weighed again, it has increased in mass.
Suggest the reason for the following observation
The mass is going to increase because the iron was combined with oxygen.
Why did the iron increase in mass?We know that the mass of the object can be obtained by the use of a weighing balance. Again it is very important that we should bear in mind that what has happened here as the iron is rusting is actually a chemical change.
The ion was bale to combine with oxygen in the presence of moisture, Given the fact that the iron has combined with oxygen, we no longer have a pure iron hence the mass of the iron is definitely going to become increased.
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If a piece of iron is weighed, allowed to go rusty, and weighed again, it has increased in mass, this is because of the formation of rust.
What is Rusting?Rusting is the slow oxidation of iron in the presence of oxygen and moisture that results in the creation of hydrated iron oxide. Rust is a brown coating that formed when iron and oxygen in the air combine, when moisture is present. Rust is a reddish-orange flaky material.
The metal surface is where rusting is most prone to happen since it is an oxidation process.
When rust forms, the mass of the iron object is increased by the mass of oxygen that has combined with some of the iron.
If a piece of iron is weighed, allowed to go rusty, and weighed again, it has increased in mass, this is because of the formation of rust.
\(Fe_{2} O_3.nH_2O\) - this will be the new composition and when you find the molar mass of this compound its obviously greater than Fe (Iron).
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the starting materials of dibenzalacetone synthesis are all colorless and turns to a clear yellow solution as it is mixed. which situation would have caused the clear yellow solution to remain as is at the end of 30 minutes?
The situation which would have caused the clear yellow solution to remain as is in dibenzalacetone synthesis at the end of 30 minutes can be due to Insufficient reactants, Inappropriate reaction conditions and Inhibition of the reaction.
The starting materials of dibenzalacetone synthesis are all colorless and turn into a clear yellow solution as they are mixed. The situation that would have caused the clear yellow solution to remain as is at the end of 30 minutes is the reaction having gone to completion. The formation of dibenzalacetone involves the aldol condensation of two moles of benzaldehyde with one mole of acetone.
The reaction is carried out in the presence of a base such as NaOH, which removes the acidic alpha-hydrogens of benzaldehyde and acetone to form the enolate ions. These ions are then condensed to form dibenzalacetone. In a successful reaction, the clear yellow solution will eventually become cloudy as dibenzalacetone forms as a solid precipitate. This can occur if not all of the starting materials were properly mixed or if the reaction did not proceed to completion due to factors such as insufficient heating or the presence of impurities.
Insufficient reactants: If there are not enough starting materials present, the reaction may not proceed to completion, and the yellow solution will not change. Inappropriate reaction conditions: Factors such as temperature, solvent, or pH could affect the reaction. If any of these factors are not optimal, the reaction may not proceed efficiently, leading to an unchanged yellow solution.
Inhibition of the reaction: The presence of any impurities or contaminants in the starting materials or the reaction mixture could potentially inhibit the reaction, causing the yellow solution to remain unchanged. To address these situations, ensure that you have the correct amounts of starting materials, follow the recommended reaction conditions, and work with clean and pure chemicals and equipment.
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Calculate the ph of a solution that is 0. 322 m in nitrous acid (hno2) and 0. 178 m in potassium nitrite (kno2). The acid dissociation constant of nitrous acid is 4. 50 x 10-4. Group of answer choices 10. 917 3. 616 3. 089 4. 598 14. 264
The pH of a solution that is 0. 322 m in nitrous acid when acid dissociation constant of nitrous acid is 4 is given by 3.089, option C.
pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14.
The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per litre, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
The concentration of nitrous acid is 0.322 M
The concentration of potassium nitrite is 0.178 M
The acid dissociation constant of nitrous acid is, ka = 4.50 x 10⁻⁴
The Henderson-Hasselbalch equation for an acidic buffer is shown below:
pH = pKa + log\(\frac{[salt]}{[Acis]}\)
pKa = - logKa
pKa = - log(4.50 x 10⁻⁴)
= 3.35
Substitute values in the equation as,
pH = 3.35 + log(0.178/0.322)
= 3.35 + log(0.6077)
= 3.35 + (-0.216)
= 3.09.
Therefore, the pH is given by 3.09.
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1. How many grams of iron (II) oxide can be produced from 3.4 g of iron in this balanced equation?
4Fe +3022Fe₂O3
2. How many grams of magnesium carbonate is produced from 6.7 g of magnesium oxide in this
balanced equation?
MgO + CO₂ → MgCO3
3. How many grams of calcium hydroxide is produced from 9.4 g of calcium chloride in this balanced
equation?
CaCl₂ + 2NaOH → 2NaCl + Ca(OH)2
Answer:
3.12g FeO3
14.33g MgCO3
5.92g Ca(OH)2
Explanation:
For the first problem, convert grams of Fe to mols of Fe.
molar mass of Fe: 55.845
Grams of Fe: 3.4g
3.4/55.845 = 0.06 mol Fe
There are 4 Fe for every 2 FeO3
So.. 0.06(2/4) = 0.03 mol FeO3
Multiply the mols by the molar mass of FeO3
Molar mass of FeO3: 103.845
0.03 * 103.845 = 3.12 g FeO3
In a sealed and rigid container, a sample of gas at 2.60 atm and 25.0 °C is heated to 50.0 °C. What is the pressure (in atm) of the gas at 50.0 °C?
The mathematical formula for the gas pressure (in atm) at 50.0 °C is P2= 2.17 atm.
Is tobacco use a gas?Under normal temperatures and pressures, substances that are totally in a gaseous state are referred to be gases. Certain solids or liquids have an accompanying gaseous phase known as a vapour. Smoke is a thin solid that results from insufficient burning.
Why are gas prices in the US rising?The price hike is attributed by AAA to an increase in fuel demand. "Pump prices have risen as a result of increased gas demand and limited supplies. Drivers will probably continue to experience pump price increases if demand grows "in line with AAA.
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Which type of wave below describes the part of the spectrum seen by the human eye?
A. TV and radio waves
B.ultraviolet rays
C.visible light rays
Answer:
C.visible light rays is answee
If 17.6 grams of Ca combines completely with 24.2 grams of S to form a compound, what is the percent composition of Ca in the compound?
PLEASE I NEED HELP ASPA!!!!
The percent composition of Ca in the compound is 42.06%.
The percent composition of Ca in the compound can be calculated using the formula:
% Ca = (mass of Ca/mass of compound) x 100
Given that 17.6 grams of Ca combine completely with 24.2 grams of S to form a compound, we can calculate the mass of the compound as:
mass of compound = mass of Ca + mass of S = 17.6 + 24.2 = 41.8 g
Substituting these values in the formula above, we get:
% Ca = (17.6 / 41.8) x 100 = 42.06%
Therefore, the percent composition of Ca in the compound is 42.06%.
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Pls help pic included
carbon ...
...............
explain why is energy input required to add an electron to zinc
Answer: When you add an electron to zinc, it needs some extra energy. This is because zinc atoms naturally don't like having an extra electron. The extra electron and the electrons already present in zinc repel each other due to their negative charges. So, you have to give some energy to the zinc atom to overcome this repulsion and make it accept the additional electron. Basically, energy input is required to make zinc accept an extra electron because the electron doesn't fit easily and needs some force to be added.
Explanation: hope this helps
Which of the following is a true statement? Select 2.
Gas particles are much smaller than the distances between them
Gas particles are the same size as the distances between them
Gas particles are much larger than the distances between them
The volume of a gas is mostly tightly packed particles.
The volume of a gas is mostly empty space.
The volume of a gas is equally empty space and tightly packed particles.
An atom has 15 protons, 15 electrons and 16 neutrons. What is the atomic
number and mass number?
Atomic number = 15 and mass number = 31 where an atom has 15 protons, 15 electrons and 16 neutrons.
What is an atom?An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. Atomic number = Number of protons.
Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
Hence, atomic number=15 and mass number=31.
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Carbon in the ocean originates from the atmosphere.
Please select the best answer from the choices provi
The given statement "Carbon in the ocean originates from the atmosphere" is true because Carbon is one of the most vital elements on Earth and is involved in various biogeochemical cycles, including the carbon cycle.
Carbon is found in the Earth's atmosphere, lithosphere, hydrosphere, and biosphere, which is the interconnected system of living organisms and their environment.The carbon cycle is a natural process in which carbon is exchanged between these reservoirs. Carbon is taken up from the atmosphere through photosynthesis, the process by which plants, algae, and some bacteria use sunlight to convert carbon dioxide (\(CO_2\)) and water into organic compounds such as sugars and starches.Ocean water, which is about 96.5 percent of the Earth's total water, absorbs carbon dioxide from the atmosphere. Dissolved carbon dioxide forms carbonic acid when it reacts with water, reducing the ocean's pH and causing ocean acidification.For more questions on the carbon cycle
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The correct question would be as
Carbon in the ocean originates from the atmosphere. Please select the best answer from the choices provided. True or False
.What is the final chemical equation from the following intermediate chemical equations?
P4O6(s) → P4(s) + 3O2(g)
P4(s) + 5O2(g) → P4O10(s)
To obtain the final chemical equation, we need to combine the given intermediate equations in a way that cancels out the common compounds and species.
The intermediate equations are:
P4O6(s) → P4(s) + 3O2(g)
P4(s) + 5O2(g) → P4O10(s)
To combine these equations, we can multiply equation 1 by 2 to balance the number of moles of P4:
2P4O6(s) → 2P4(s) + 6O2(g)
Now, we can add equation 2 to the modified equation 1 to cancel out the common compounds (P4 and O2) and obtain the final balanced chemical equation:
2P4O6(s) + P4(s) + 5O2(g) → 2P4(s) + 6O2(g) + P4O10(s)
Simplifying the equation, we have:
2P4O6(s) + P4(s) + 5O2(g) → 2P4O10(s)
Therefore, the final chemical equation from the given intermediate equations is:
2P4O6(s) + P4(s) + 5O2(g) → 2P4O10(s)
The final balanced chemical equation from the following intermediate chemical equations is 2P4O6(s) + P4(s) + 5O2(g) → 2P4O10(s).
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The name for a positive ion is a ....
The name for a positive ion is a cation.