Can anyone explain and answer?
Which physical change are both exothermic
A)condensation and evaporation
B)evaporation and melting
C)freezing and condensation
D)melting and freezing
Answers
Answer:
I would say C.)
Explanation:
Freezing and condensation are both ways that heat is let out from an object.
Related Questions
The following diagrams represent mixtures of NO(g) and O2(g). These two substances react as follows: 2NO(g) + O2(g)----2NO2(g) It has been determined experimentally that the rate is second order in NO and first order in O2. Based on this fact, which of the following mixtures will have the fastest initial rate? The mixture (1). The mixture (2). The mixture (3). The right answer is the mixture 1, but I do not know why. So..
Answers
Based on the given fact Mixture 1 has the fastest initial rate in the reaction 2NO(g) + O\(_2\)(g)----2NO2\(_2\)(g), where the rate is second order in NO and first order in O2.
The reaction is given as:
2NO(g) + O\(_2\)(g)----2NO2\(_2\)(g)
The rate law for this reaction can be written as:
Rate = k\([NO]^2[O_2]\)
where k is the rate constant, [NO] is the concentration of NO, and [O\(_2\)] is the concentration of O2. To determine which mixture has the fastest initial rate, we need to compare the initial concentrations of NO and O\(_2\) in each mixture.
Mixture 1:
- High concentration of NO
- High concentration of O\(_2\)
Mixture 2:
- Low concentration of NO
- High concentration of O\(_2\)
Mixture 3:
- High concentration of NO
- Low concentration of O\(_2\)
Now let's compare the mixtures based on the rate law:
Mixture 1: Rate = k(x)\([High\ NO]^2\) [High O\(_2\)] = k(High NO^2)(High O\(_2\))
Mixture 2: Rate = k([Low NO\(]^2\))[High O\(_2\)] = k(Low NO^2)(High O\(_2\))
Mixture 3: Rate = k([High NO\(]^2\))[Low O\(_2\)] = k(High NO^2)(Low O\(_2\))
Since the rate is second order in NO, the effect of NO concentration is more significant than that of O\(_2\). Mixture 1 has both high NO and high O\(_2\)concentrations, which results in the highest rate among the three mixtures.
Therefore, the fastest initial rate occurs in mixture 1.
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the density of aluminum is 2.70 g/cm3. the mass of a solid piece of aluminum is 3.32 g. what is the volume of the aluminum?
Answers
Answer:
Aluminum has a density of 2.70 g/cm3
when do electrons release photons
Answers
Answer:
Later when they are older
Explanation:
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Which rock is an example of a chemical sedimentary rock?
coal
iron ore
shale
sandstone
Answers
Iron ore is the rock that is an example of chemical sedimentary rock.
Chemical sedimentary rocks are those rocks that dissolve material precipitates from the solutions. Shale is a clastic sedimentary rock.Sandstone is a clastic sedimentary rock.Coal is an organic sedimentary rock.Iron ore is an example of chemical sedimentary rock because they are formed by the chemical reaction of iron with oxygen present in a marine or fresh water.Hence, iron ore is the correct option.
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Image of iron ore is given below.
Answer:
iron ore
Explanation:
An oil may be converted into a substance that is solid at room temperature by Group of answer choices adding hydrogens, decreasing the number of double bonds in the molecules. cooling it, so that double bonds form and the fats solidify. removing water, causing a dehydration synthesis reaction to occur. removing hydrogens, increasing the number of double bonds in the molecules.
Answers
Answer:
Adding hydrogens, decreasing the number of double bonds in the molecules.
Explanation:
Hydrogen is a catalyst, which means that it accelerates or speeds up the velocity of a chemical reaction, by adding hydrogens to oil it will decrease the number of double bonds in the molecules which will make it solidify over time.
Oil + hydrogen creates substances that are solid at room temperature.
2. Which of the following shows the correct, balanced equation for the reaction shown below?
CH4+0₂H₂O + CO₂
O CH, + O, → CHO
O CH4 +20₂ → 2 H₂O + CO₂ OCH, + O2 → H2O +CO,
OCH4 +0₂ → CH₂0
Answers
The balanced equation is \(\text{CH}_{4}+2\text{O}_{2} \longrightarrow \text{CO}_{2}+2\text{H}_{2}\text{O}\).
The correct balanced chemical equation is CH₄ + 2 O₂\(\rightarrow\) CO₂ + 2 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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order the atomic-scale pictures of solutions by decreasing concentration
Answers
According to the information, the proper order for the solutions from highest to lowest concentration can be inferred: 0.5 L (3 atoms), 1 L (5 atoms), 0.5 L (2 atoms), 1 L (3 atoms), 0.8 L (2 atoms).
How to classify solutions according to their concentration?To classify solutions according to their concentration, we must bear in mind that concentration refers to the number of atoms of an element in a given quantity. According to the above, it can be inferred that depending on the amount of liquid in each container and the amount of atoms (units) of another element we can establish the concentration.
According to the above, the correct classification from higher concentration to lower concentration would be:
0.5 L (3 atoms)1 L (5 atoms)0.5 L (2 atoms)1 L (3 atoms)0.8 L (2 atoms)Learn more about concentration solution in: https://brainly.com/question/10720472
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100 cm³ of a gas at 27°C is cooled to 20°C at constant pressure .Calculate the volume of gas at 20°C.
Answers
According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;
\(\begin{gathered} V\alpha T \\ V=kT \\ k=\frac{V}{T} \\ k=\frac{V_1}{T_1}=\frac{V_2}{T_2} \end{gathered}\)where;
V1 and V2 are the initial and final volume of the gas
T1 and T2 are the initial and final temperatures of the gas (in Kelvin)
Given the following parameters:
\(\begin{gathered} V_1=100\operatorname{cm}^3 \\ T_1=27^0C=27+273=300K \\ T_2=20^0C=20+273=293K \\ V_2=\text{?} \end{gathered}\)Substitute the given parameters into the formula;
\(\begin{gathered} V_2=\frac{V_1T_2}{T_1}^{} \\ V_2=\frac{100\times293}{300} \\ V_2=\frac{29300}{300} \\ V_2=\frac{293}{3} \\ V_2=97.67\operatorname{cm}^3 \end{gathered}\)Therefore the volume of the gas at 20°C is approximately 97.67cm³
during a synthesis reaction, 3.2 grams of magnesium reacted with 12.0 grams of oxygen. what is the maximum amount of magnesium oxide that can be produced during the reaction? mg o2 → mgo (5 points)
Answers
In a synthesis reaction, 3.2 grams of magnesium combined with 12.0 grams of oxygen. The maximum amount of magnesium oxide that can be produced in this reaction is 5.33 grams,
The balanced chemical equation for the synthesis of magnesium oxide is 2 Mg + O2 → 2 MgO.
According to this equation, 2 moles of magnesium react with 1 mole of oxygen to produce 2 moles of magnesium oxide. To determine the maximum amount of magnesium oxide produced, the given masses of magnesium and oxygen are converted into moles using their respective molar masses.
The molar mass of magnesium (Mg) is approximately 24.31 g/mol, and the molar mass of oxygen (O2) is around 32.00 g/mol. By dividing the given mass of magnesium (3.2 grams) by its molar mass, we obtain approximately 0.132 moles of magnesium.
Similarly, dividing the given mass of oxygen (12.0 grams) by its molar mass, we obtain approximately 0.375 moles of oxygen. Since the ratio between magnesium and magnesium oxide is 1:1, the amount of magnesium oxide produced will be equal to the amount of magnesium used. Therefore, the maximum amount of magnesium oxide that can be produced during the reaction is approximately 0.132 moles. Converting this to grams using the molar mass of magnesium oxide (40.31 g/mol), we find that the maximum amount of magnesium oxide produced is approximately 5.33 grams.
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what is the charge qencl contained within the gaussian cylinder?
Answers
The charge qₑₙ contained within the Gaussian cylinder is equal to the net charge enclosed by the cylinder.
Determine the Gauss's Law?In the context of Gauss's Law in electromagnetism, a Gaussian cylinder is an imaginary surface used to apply the law. Gauss's Law states that the electric flux through a closed surface is proportional to the net charge enclosed by that surface.
The charge qₑₙ enclosed within the Gaussian cylinder can be determined by calculating the integral of the electric field over the surface of the cylinder. This integral represents the electric flux passing through the surface, which is proportional to the net charge enclosed.
To find the value of qₑₙ, you need to evaluate the integral of the electric field over the surface of the Gaussian cylinder. The result will be the net charge enclosed by the cylinder.
By using Gauss's Law and properly considering the symmetry and characteristics of the electric field, you can determine the charge qₑₙ enclosed within the Gaussian cylinder for a given distribution of charges.
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How many grams of sodium hydroxide (NaOH) do you need to make 6.5 L of 1.0M solution?
Answers
260grams
Explanations:The formula for calculating the moles of NaOH is expressed as
\(\begin{gathered} moles=molarity\times volume \\ moles\text{ of NaOH}=1.0M\times6.5L \\ moles\text{ of NaOH}=6.5moles \end{gathered}\)Determine the required mass of NaOH
\(\begin{gathered} Mass\text{ of NaOH}=moles\times molar\text{ mass} \\ Mass\text{ of NaOH}=6.5\cancel{moles}\times\frac{40g}{\cancel{mole}} \\ Mass\text{ of NaOH}=260grams \end{gathered}\)Hence the grams of sodium hydroxide (NaOH) you need to make 6.5 L of 1.0M solution is 260grams
which one of the ff is correct about Acids?
a,acids have bitter taste
b,acids have HP value of less than 7
c,acids have POH value of less than 7
d,all are correct
Answers
Answer:
b acid have ph less than 7
What type of energy transfer takes place when music is coming out of a speaker?
Answers
what is chemical formula of benzaldehyde?
Answers
Answer:
the chemical formula of benzaldehyde is C₇H₆O
How does the energy required to ionize a muonic hydrogen atom compare to that required to ionize a regular hydrogen atom?
Answers
The energy required to ionize a muonic hydrogen atom compare to that required to ionize a regular hydrogen atom:
What is muonic hydrogen atom?Muonic hydrogen is an exotic hydrogen atom, where a muon (instead of an electron) orbits proton. Because muon is 200 times heavier than the electron, the muon's orbit is 200 times closer to the proton in muonic hydrogen than that of the electron in regular hydrogen.
The extremely precise extraction of proton radius obtained by Pohl et al. from measured energy difference between the 2P and 2S states of muonic hydrogen disagrees significantly with that extracted from electronic hydrogen or elastic–proton scattering. This discrepancy is proton radius puzzle.
In muonic hydrogen electron is replaced by muon, μ which is 200 times heavier than electron
ΔE= En - Ei
for hydrogen like atom,
ΔE= 13.6(Z square /n square) - (-13.6Z square/1 square)
For, Z=1 and n=x (for ionization)
I.E.=13.6eV for electron
I.E.∝ mass (as binding energy proportional to mass)
I.E.=13.6eV*200
=2720eV
=2.720keV
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Calcium (Ca) has an atomic number of 20. It can form an ion by losing 2
electrons. What would its charge be?
A. 18
B. 22
C. 2+
D. 2-
Answers
Answer:
2+
Explanation:
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The concentration of PBDEs in herring gull eggs from the Great Lakes was about 1100 ppb in 1990, and about 7000 ppm in 2000. What is the doubling time for PBDEs in this source? If past trends continue, what will be the concentration in 2010
Answers
For a concentration of PBDEs in herring gull eggs, doubling time for PBDEs in this source is 0.778 yrs. The concentration in 2010 is equals to 44.16 ppm.
We have a concentration of PBDEs in herring gull eggs from the Great Lakes was about 1100 ppb in 1990.
Concentration in 2000 = 7000 ppm
= 7000 × 10³ ppb
We have to doubling time for PBDEs in this source and concentration in 2010.
Time = 10 yr
The rate constant is \(k = \frac{ 2.303 }{t} \frac{ log[a]}{log[a - x]}\),
Plugging the values, \(k = \frac{ 2.303 }{10} log( \frac{ 7000× 10³ }{1100})\)
= 0.875/yr
Doubling time = 0.69/k
= 0.778 yrs.
Now, the we determine the concentration in 2010. Let the concentration be equal x.
\(0.778 = \frac{ 2.303 }{10} log(\frac{ x}{7000 })\)
=> \(\frac{ x}{7000 \: ppm} = 10^{3.8}\)
=> x = 44.16
Hence, required value is 44.16 ppm.
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a sample of a substance with the empirical formula xcl2 weighs 0.5808 g. when it is dissolved in water and all its chlorine is converted to insoluble agcl by addition of an excess of silver nitrate, the mass of the resulting agcl is found to be 1.3133 g. the chemical reaction is
Answers
The chemical reaction involved in the conversion of the substance with the empirical formula XCl2 to insoluble AgCl by addition of silver nitrate (AgNO3) can be represented as follows:
2AgNO3 + XCl2 → 2AgCl + X(NO3)2
Based on the given information, we can determine the molar mass of XCl2 and then find its molecular formula.
Calculate the moles of AgCl formed:
Moles of AgCl = mass of AgCl / molar mass of AgCl
Moles of AgCl = 1.3133 g / (107.87 g/mol) = 0.01215 mol
Since 2 moles of AgCl are formed from 1 mole of XCl2, the moles of XCl2 can be calculated as:
Moles of XCl2 = (0.01215 mol AgCl) / 2 = 0.00608 mol
Calculate the molar mass of XCl2:
Molar mass of XCl2 = mass of XCl2 / moles of XCl2
Molar mass of XCl2 = 0.5808 g / 0.00608 mol = 95.39 g/mol
Now that we have the molar mass of XCl2, we can determine its molecular formula by comparing it to the empirical formula XCl2.
To find the molecular formula, we need additional information about the molar mass of X, but it is not provided in the given information. Without the molar mass of X, we cannot determine the molecular formula of the substance.
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what are the partial pressures of nh3 and h2s at equilibrium, that is, what are the values of pnh3 and ph2s , respectively?
Answers
H2S has a pressure of 0.368 atm, while NH3 has a pressure of 0.325 atm.
According to the query, the equilibrium partial pressure of NH3 and H2S has the values PNH3 and PH2S. The air is separated in accordance with the numerical equilibrium of the partial pressures of ammonia and hydrogen sulphate. The sum will be as follows:
According to ammonium bisulfite, the NH4HS(s)⇄NH3(g)+H2S(g) reacts with NH3 to produce hydrogen sulphide and ammonia (g)
This reaction will occur at 25°C if K's p-value is 0.120. NH3 has a partial pressure of 0.325 atm, while H2S has a partial pressure of 0.368 atm.
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Word Bank:
amount
atomic mass
atomic mass
atomic mass
atomic number
name
charge
electrons
neutrons
nucleus
protons
same
The number of protons in one atom of an element determines the atom’s _________________, and the number of electrons determines the _________________________ of the element.
The atomic number tells you the number of ___________________________ in one atom of an element. It also tells you the number of __________________________ in a neutral atom of that element. The atomic number gives the “identity” of an element as well as its location on the periodic table. No two different elements will have the ____________________ atomic number.
The ______________________ of an element is the average mass of an element’s naturally occurring atom, or isotopes, taking into account the ____________________ of each isotope.
The _______________________ of an element is the total number of protons and neutrons in the ___________________ of the atom.
The atomic mass is used to calculate the number of ______________________ in one atom of an element. In order to calculate the number of neutrons you must subtract the ______________________ from the ______________________.
Answers
Answer:
name,atomic mass,electrons,protons,same,charge,amount,atomic mass,charge,neutrons,atomic number,atomic mass
Which of the following statements correctly identifies the decomposition reaction and describes a substance involved
Answers
Option C. Decomposition reaction: a substance involved is oxygen.
A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances.Decomposition Reaction Involving OxygenA decomposition reaction is a type of chemical reaction where a single compound is broken down into two or more simpler substances. In the reaction, energy is typically used to break down the bonds that hold the molecules of the compound together. Oxygen is often a substance involved in the reaction, as it is used to provide the energy needed to break down the compound. When oxygen is involved, the reaction is sometimes referred to as an oxidation reaction.
Since the question is not complete, here's the full task:
Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?
Choose the right option:
A. Combustion reaction: a substance involved is oxygen
B. Combustion reaction: a substance involved is a hydrocarbon
C. Decomposition reaction: a substance involved is oxygen
D. Decomposition reaction: a substance involved is a hydrocarbon
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An element is a specific type of atom (true or false)
Answers
Answer:
True
Explanation:
An element is pure substance that conatin only one type of atom
Answer:
true
Explanation:
the element hydrogen is made from atom
Question 6
6.7 pts
A solution has a very high electrical conductivity, turns litmus paper red and has a pH of 2.0. This is most likely
a(n)
Base/Strong Electrolyte
Acid/Weak Electrolyte
Acid/Strong Electrolyte
Base/Weak Electrolyte
Next
« Previous
Answers
Answer:
Acid/String Electrolyte
Explanation:
Litmus paper turning red means it is an acidic solution. A pH of more than 7 is Base while pH of less than 7 is an acid. Since the pH is 2, less than 7, it s is an acid. Since it has a high electrical conductivity, it must be a strong Electrolyte.
How do I convert μg/l to mol/kg?
Answers
Answer
To convert μg/l to mol/kg?
Step 1: from the mass in grams, find the number of moles by diving the mass by its molar mass
Step 2: To go from L to kg, take the volume given multiply it by density in kg/L
What are some ways we can measure how much energy a substance has?
Answers
The sum of all an object's atoms and molecules' energies makes up the substance's total energy.
What is a substance's total amount of energy?The sum of all an object's atoms and molecules' energies makes up the substance's total energy. Both the potential energy resulting from the interactions between molecules and the kinetic energy of the particles resulting from the motions of molecules within the material and of atoms inside molecules make up thermal energy.The equation q = m c T , where m is the mass of the sample, c is the specific heat, and T is the temperature change, may be used to determine how much heat is acquired or lost by a sample (q).
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The ideal gas law is equivalent to Charles's law when
a) volume equals 22.4 L
b)R equals 0
c)number of moles and temperature are constant
d)number of moles and pressure are constant
Answers
The ideal gas law is equivalent to Charles's law when number of moles and pressure are constant (option D)
Ideal gas equationPV = nRT
Where
P is the pressure V is the volume n is the number of mole R is the gas constant T is the temperature Charles' lawCharles' law states as follow:
V₁ / T₁ = V₂ / T₂
Where
V₁ is the initial volume T₁ is the initial temperature V₂ is the new volume T₂ is the new temperature How to relate ideal gas equation to Charles' lawPV = nRT
Divide both side by T
PV / T = nR
Divide both side by P
V / T = nR / P
Let nR / P be costant
V / T = constant
Thus,
V₁ / T₁ = V₂ / T₂
From the above illustrations, we can conclude that the ideal gas equation will become Charles' law equation if the number of mole and pressure are constant (Option D)
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Marie Curie's work with radioactive materials eventually lead to her death. At the age of 66, what
disease did Madame Curie die from?
Answers
Answer:
Radiation-induced Luekimia
Explanation:
They worked with many radioactive elements, so it caused Leukemia which is
a disease in which the bone marrow and other blood-forming organs produce increased numbers of immature or abnormal leukocytes.
Hoped this helped
What is the area of science that studies tiny particles like atoms?
Answers
Quantum mechanics is the study of atoms and incredibly tiny particles that are even smaller.
In quantum mechanics, another branch of physics, atomic and subatomic particles are investigated. The primary field of science that deals with the study of atoms and molecules is chemistry. By utilizing their knowledge of atoms, chemists create molecules that resemble drugs. A distinction is established between atomic physics, which studies the atom as a system made up of a nucleus and electrons, and nuclear physics, which explores nuclear reactions and special properties of atomic nuclei. Three subatomic particles make up matter: protons, neutrons, and electrons. The only subatomic particles that have electrical charges are protons and electrons, with protons having a positive charge and electrons having a negative charge.
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If there was a drink that could make you younger, how much would you drink from the bottle? If for one drink you become 1 year younger
Answers
if you drink the water your not 1year old you can drink just little.
Explanation:
done
Answer:
the whole thing hfddddddddfffffg
Identify each description as a feature of transcription, translation, or neither.
Two DNA molecules result from one original molecule:
Amino acids are linked together at ribosomes:
RNA base sequences complementary to those in DNA are built:
Complementary tRNA bases match up to mRNA bases:
Answers
Answer:
neither
translation
transcription
translation
Explanation:
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Answer:
Two DNA molecules result from one original molecule:
✔ neither
Amino acids are linked together at ribosomes:
✔ translation
RNA base sequences complementary to those in DNA are built:
✔ transcription
Complementary tRNA bases match up to mRNA bases:
✔ translation
(Photo for proof at the bottom.)
Explanation:
Transcription is where the DNA sequence is replicated onto an RNA strand. The strand of RNA that is replicated has bases that are complementary to the bases on the DNA strand being replicated.
Translation is where the RNA, or mRNA, is transported to the cytoplasm where tRNA bases match with 3 RNA bases, and produces proteins in the process.
Here's a photo of Edge incase you're doubtful.
