Endothermic reactions are those in which heat is absorbed from the surroundings.
What are endothermic reactions?They are reactions in which heat is absorbed from the surrounding, making the reaction vessels become colder.
It is unlike exothermic reactions in which heat is released into the surrounding, making the reaction vessel to be warmer.
For endothermic reactions, the enthalpy change is always positive because heat is absorbed. It is however negative for exothermic reactions because heat is evolved.
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Answer:
B. 6CO2 + 12H2O + energy = C6H12O6 + 6O2 + 6H2O
Explanation:
Given the gas laws what has to increase to increase temperature
Given the gas laws, the volume has to increase, with the increase in temperature.
What are gas laws?There are three basis gas laws which relates the pressure, temperature, and volume of the gas.
Boyle's law—states that with the decrease in the pressure of the gas, the volume increases.Charles' law - states that volume of gas increase with increase in the temperature of the gas. Avogadro's Law - states that the volume of gas increases as the amount of gas increases.The ideal gas law is the combination of the three simple gas laws.
Thus, the volume has to increase, with the increase in temperature.
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A 5. 00 l container contains ch4, h2, and xe at 35°c with a total pressure of 1. 81 atm. If there are equal moles of each gas, what is the partial pressure of h2?
If there are equal moles of each gas, what is the partial pressure of H₂ is 0.362.
What is partial pressure?The pressure that one of the gases in a mixture would exert if it were in the same volume on its own.
According to the Dalton's law of partial pressure
The Partial pressure of a gas = (Total pressure × mole fraction of the particular gas)
Partial pressure of H₂ is
[tex]\dfrac{1.81}{5.00} = 0.362[/tex]
Thus, the partial pressure of H₂ is 0.362.
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Ilver oxide decomposes to form silver metal and oxygen gas chemical formual
The chemical formula of decomposition of silver oxide to form silver metal and oxygen gas is 2Ag₂O ⇒ 4Ag + O₂.
What is decomposition reaction?Decomposition reaction are those reactions in which the compounds are breakdown into simpler form.
In the given reaction, the silver oxide is decomposing in silver and oxygen.
2Ag₂O ⇒ 4Ag + O₂.
Thus, the chemical formula of decomposition of silver oxide to form silver metal and oxygen gas is 2Ag₂O ⇒ 4Ag + O₂.
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Which of the following is a synthesis reaction?
AgNO3 + NaCl → AgCl + NaNO3
CH4 + O2 → CO2 + H2O
SO3 + H2O → H2SO4
Cu + AgNO3 → Ag + CuNO3
Synthesis reaction
It is a reaction in which 2 or more reactants combine with each other to form one product .
Check option C
Sulphate and water are combining to form sulfuric acid .
Hence option C is correct
Answer:
SO3 + H2O => H2SO4
Explanation:
I took the test :)
Is salinity higher or lower near ice? EXPLAIN!
2H2 + O2 + 2H2O
How many moles of oxygen are needed to produce 10 L of H2O at STP?
Answer:
V=10 l H2O
VM=22.4 l/mole
n=V/Vm=0.446 moles H2O
the ratio 1:2
x:0.446
x=0.223 moles O2
What amino acids do the following sequences code for? uuc
The amino acid coded by the sequence code UUC is phenylalanine.
What are amino acids?An amino acid is an organic compound made up of an amine group and carboxylic group. There are total 20 amino acids are present.
Phenylalanine is coded by two code sequence UUU and UUC. It is not an essential acid, and its role in the body is not confirmed.
Thus, the amino acid coded by the sequence code UUC is phenylalanine.
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Write the ionization equation and the ka expression for aqueous formic acid. What is the name of the anion that forms?
Ionization reaction gives the ionization state of the chemical species. Its ionization will result in a conjugate base of the formic acid and release a hydrogen ion.
What is the acid dissociation constant?The acid dissociation constant is the concentration of the acid that has been dissociated into its constituents ions in the solution.
The ionization equation of the formic acid is:
[tex]\rm HCOOH \rightleftharpoons HCOO^{-} + H^{+}[/tex]
The acid dissociation constant (Ka) for formic acid is given as,
[tex]\rm Ka = \rm \dfrac {[H^{+}][HCOO^{-}]}{[HCOOH]}[/tex]
Anions are negatively charged ions and formate ions generated in the dissociation of the formic acid.
Therefore, the formate ion is an anion.
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22. Which of the following elements has the smallest electron affinity? A. carbon C. neon B, oxygen D. flourine
Answer:
carbon
Explanation: carbon is the answer
The triple point of nitrogen occurs at a temperature of 63.1 K and a pressure of 0.127 atm. Its normal boiling point is 77.4 K. (a) What is the vapor pressure of solid nitrogen at 63.1 K
Nitrogen has a normal boiling point of 77.4 K and a melting point (at 1 atm) of 63.2 K. Its critical temperature is 126.2 K, and its critical pressure is 2.55 * 104 torr. It has a triple point at 63.1 K and 94.0 torr.
What is the triple point?The temperature and pressure at which the solid, liquid, and vapour phases of a pure substance can coexist in equilibrium.
- Normal melting point: 63.2 K.
- Normal boiling point: 77.4 K.
- Triple point: 0.127 atm and 63.1 K.
- Critical point: 33.5 atm and 126.0 K.
In such a way:
- N2 does not exist as a liquid at pressures below 0.127 atm: that is because below this point, solid N2 exists only (triple point).
- N2 is a solid at 16.7 atm and 56.5 K: that is because it is above the triple point, below the critical point and below the normal melting point.
- N2 is a liquid at 1.00 atm and 73.9 K: that is because it is above the triple point, below the critical point and below the normal boiling point.
- N2 is a gas at 0.127 atm and 84.0 K: that is because it is above the triple point temperature at the triple point pressure.
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COCI2 has an effusion rate of 0.00172 m/sec. Which of the gases below would have an effusion rate of 0.00323 m/sec?
a) CH4
b) CO
c) Ne
d) H2S
Show work.
Figure 4, Future climate prediction for North America. By 2100, the low-emissions scenario (550 ppm CO2, left) and high-emissions scenario (800 ppm CO2, right) show dramatic precipitation changes. Tan and brown colors show that an area is expected to receive less precipitation, while blue colors show that an area is expected to receive increased precipitation. The image is edited.
According to Figure 4: Climate Projections, how will Las Vegas change by 2100?
options:
You can not tell from this image.
Las Vegas is likely to stay the same.
Las Vegas is expected to receive increased precipitation.
Las Vegas is expected to receive less precipitation.
Answer:
Las Vegas is expected to recieve less precipitation
A sample of hydrogen is collected in a flask over water. The partial pressures are 789 mmHg for H₂
and 60 mmHg for H₂O. What is the total pressure exerted by the mixture of gasses?
The total pressure of the gas is calculated as 849 mmHg.
What is partial pressure?The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.
In this case, the partial pressures of hydrogen and water are 789 mmHg and 60 mmHg respectively.
Thus, the total pressure of the gas = 60 mmHg + 789 mmHg = 849 mmHg.
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What is the name of rover that was just sent to Mars in March of 2021?
A.Spirit
B.Curiosity
C.Opportunity
D.Perseverance
NEED THIS ASAP PLEASE HELP
Which of these is an example of a physical change?
A. a banana ripening in the air
B. hydrogen burning in the air
C. zinc reacting with an acid
D. liquid water turning into vapor
Answer:
A
Explanation:
Banana ripening in air is an example of oxidation reaction.
calculate the number of particles of 285 grams of Al2O3
The number of particles of 285 grams of aluminum oxide (Al2O3) is 1.68 x 10²⁴ particles.
Number of moles of the Al2O3The number of moles of the given aluminum oxide is calculated as follows;
Al2O3 = 101.96 g/mol
moles = 285/101.96
moles = 2.795 moles
1 mole = 6.02 x 10²³ particles
2.795 moles = ?
= 2.795 x 6.02 x 10²³ particles
= 1.68 x 10²⁴ particles.
Thus, the number of particles of 285 grams of aluminum oxide (Al2O3) is 1.68 x 10²⁴ particles.
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Match each interaction type to the correct amount of potential energy.
The type of energy which is present between the repulsion interaction is the highest potential energy.
What is potential energy?Potential energy is the amount of energy that is possess by any body with respect to the electric charge posses in that and other factors also.
When molecules have a high attraction force then they have the low potential energy in them.When molecules have a great repulsion between them then they have the great potential energy in them.And molecules have the middle amount of potential energy then they have the balanced interaction.Hence, molecules in which repulsion interaction is present will have highest potential energy.
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In the product 6o2, what does the coefficient mean?.
Answer:
It means there are 6 O2 molecules
Explanation:
I really need help with this problem.
A mixture contains 21.7g NaCl, 3.74g KCl, and 9.76g LiCl.
How many moles of NaCl are in this mixture?
The molar mass is provided in picture attached.
Answer:
.371 mole of NaCl
Explanation:
Na Cl Mole weight = 22.989 + 35.45 = 58.439 g/mole
21.7 g / 58.439 g/mole = .371 mole
How do your eyes, ears, nose, tongue, and skin send information to your brain?
They send signals through the blood.
They send signals through the nerves.
Each sends messages in a different way.
They send molecules through the air.
Answer:
they send signals through the nerves. through sensory receptors to be specific
Write a balanced equation for the combustion of 1 mol of c4h10o(l)
The combustion of diethyl ether gives releases of carbon dioxide gas along with the water.
What is combustion?Combustion is given as the reaction of the burning of the compound in the presence of oxygen.
The combustion results in the breakdown of the compound to its constituent ions or atoms. The reaction of combustion of [tex]\rm C_4H_1_0_O[/tex] is:
[tex]\rm C_4H_1_0_O\;(l)\;+\;6\;O_2\;(g)\;\rightarrow\;4\;CO_2\;(g)\;+\;5\;H_2O\;(l)[/tex]
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Location E is located at the Tropic of Cancer, while location F is at the equator. Which location is likely to be warmer at the start of the summer in June? Location E, because Earth is receiving equal sunlight throughout Location F, because Earth is receiving equal sunlight throughout Location E, because Earth's axis is tilted towards the sun Location F, because Earth's axis is tilted away from the sun
The answer is "Location E, because Earth's axis is tilted towards the sun" :D
Answer:
C. Location E, because earth's axis is tilted towards the sun
Explanation:
Calculate the molarity it’s, M, if a solution prepared by dissolving 20 g of NaCl in 1 L of water.
Solve-step-by-step
Answer:
.3422 M
Explanation:
Mole weight of NaCl ( from periodic table) = 58.439 gm/mole
20 g is how many moles ? 20 g / 58.439 gm/mole=.3422 mole
.3422 mole / 1 liter .3422 M
Hi hope you all are doing well
Answer:
yesss
Explanation:
hehhehehhehe
Determine the oxidation number of chromium (cr) in each of the following compounds. (1) cro2 4 (2) cr2o72− 6 (3) cr2(so4)3 −3
The oxidation number of chromium (Cr) in CrO₂, Cr₂O₇²⁻ and Cr₂(SO₄)₃³⁻ is +4, +6 and +1.5 respectively.
What is oxidation number?Oxidation number of any compound gives idea about the number of exchangeable electrons from the outer most shell of an atom.
CrO₂Let the oxidation state of chromium is x and charge on the whole molecule is zero, so it will be calculated as:
x + 2(-2) = 0
x - 4 = 0
x = +4
Cr₂O₇²⁻Let the oxidation state of chromium is x and charge on the whole molecule is -2, so it will be calculated as:
2x + 7(-2) = -2
2x - 14 = -2
2x = 12
x = +6
Cr₂(SO₄)₃³⁻Let the oxidation state of chromium is x and charge on the whole molecule is -3, so it will be calculated as:
2x + 3(-2) = -3
2x - 6 = -3
2x = 3
x = +1.5 (which is impossible)
Hence oxidation state of chromium atom in CrO₂, Cr₂O₇²⁻ and Cr₂(SO₄)₃³⁻ is +4, +6 and +1.5 respectively.
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Discussion the sn1 and sn2 substitution reactions. Haloalkanese
The SN₁ substitution reaction, in which the halogen is released from the haloalkane, and the nucleophile attacks the carbon's positive charge. SN₂ in which the nucleophile attacks the halogen's carbon, causing the halogen to be replaced in which nucleophile attack.
What is substitution reaction?
Substitution reactions are those reactions in which one functional group is replaced by another functional group.
Two types of substitution reactions can occur in haloalkanes: SN1 and SN2.
Thus, the SN₁ substitution reaction, in which the halogen is released from the haloalkane, and the nucleophile attacks the carbon's positive charge. SN₂ in which the nucleophile attacks the halogen's carbon, causing the halogen to be replaced in which nucleophile attack.
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H2504 has a pH of 1. How many times more acidic is it compared to the chemical
above?
HELPPP
Select all that apply. Which of these conditions will cause an increase in the molar concentration of a solution?
A) Increasing the amount of solute
B) Adding water to the aqueous solution
C) Some of the water evaporating from the aqueous solution
D) Stirring the solution
Answer:
A
Explanation:
-Icreaseing the solute would increase the concentration
-increasing the solvent will decrease the concentration
What are the basic units of matter?
electrons
atoms
protons
neutrons
Which metals will dissolve in nitric acid but not hydrochloric
The metal that can react and dissolve in nitric oxide but not in HCl is copper.
What is reactivity series?The reactivity series is given as the arrangement of the metals in the descending order of their reactivity.
The HCl is able to dissolve the metals that have reactivity less than the hydrogen. Nitric oxide is a strong oxidizing agent and has the ability to react with metals such as copper and oxidizes it.
The HCl is however unable to react with copper as it has high reactivity than hydrogen. Thus, copper can dissolve in nitric oxide, but not in HCl.
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