Answer:
Whether a chemical reaction absorbs or releases energy, there is no overall change in the amount of energy during the reaction. That's because energy cannot be created or destroyed. This is the law of conservation of energy.
How many moles of C2H2 are required to produce 0.60 mol of H2O?
Express your answer to two significant figures and include the appropriate units.
Answer:
0.60 moles
Explanation:
From the reaction:
[tex]2C_2H_2 + 5O_2 \to 4CO_2+2H_2O[/tex]
From above, Only 2 moles of CH2CH2 are required to produce 2 moles of water (H_2O).
As such, 0.6 moles of H2O will require:
x (CH2CH2) × 2 moles of (H_2O) = 0.6 moles (CH2CH2) × 2 mole of (H_2O)
x mole of (CH2CH2) = 0.60 moles
∴
0.6 moles of H2O will require 0.60 moles of CH2CH2
When the concentration of reactant molecules is increased
Complete question is;
When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases,
A)the average kinetic energy of molecules increases.
B)the frequency of molecular collisions increases.
C)the rate constant increases.
D)the activation energy increases.
E)the order of reaction increases.
Answer:
B) The frequency of molecular collisions increases.
Explanation:
When we increase number of reactant molecules, the effective collision between the reactant molecules will form a product which also increases. As a result, the overall rate of the reaction will also increase which means the frequency of the molecular collision will also increase as well.
Thus, the correct answer is Option B
Which is an example of technology leading to a new discovery?
A. A truck is used to ship goods between two states.
B. A telescope shows that there is a planet past Neptune
C. An irrigation system is installed at a farm.
D. An antibiotic is used to treat an infection.
Answer:
I think the answer would be B, because there is still stuff past the known exception of out private solar system. (and all the other options don't discover anything.)
Which of the following is an example of a physical property?
A- Luminol reacting with blood stains to create a faint light
B- Bleach changing the color of a Ph test strip
C- The thickness of glass shards from a crime scene
D- Heroin turning purple when it is exposed to Marquis reagent
Answer:
The answer is C
Explanation:
It just makes the most sense to me
The symbol for free energy is
a. DG.
b. DS.
c. DT.
d. DH.
Part A. Classify each of these soluble solutes as a strong electrolyte, a weak electrolyte, or a nonelectrolyte. Solutes Formula Nitric acid HNO3 Potassium hydroxide KOH Formic acid HCOOH Ethyl amine CH3CH2NH2 Sodium bromide NaBr Butanol C4H9OH Sucrose C12H22O11
Part B. Enter a molecular equation for the reaction that occurs between aqueous HBr and aqueous LiOH.
Answer:
1. Strong electrolytes = Nitric acid HNO3,Potassium hydroxide KOH, Sodium bromide NaBr
Weak electrolytes = Formic acid HCOOH Ethyl amine CH3CH2NH2, Butanol C4H9OH
Non-electrolyte = Sucrose C12H22O11
2. The reaction between aqueous HBr and aqueous LiOH is shown innthe equation below:
HBr + LiOH ----> NaBr + H₂O
Explanation:
Electrolytes are substances that when in molten state or in aqueous solution dissociate into ions both positively-charged and negatively-charged ions known as actions and anions, which are then able conduct electricity.
Strong electrolytes are aqueous or molten solutions of compounds which ionize completely to produce anions and actions. Ionic compounds such as organic salts, acids and bases are strong electrolytes.
Weak electrolytes only ionize partially, that is, they produce few ions. Some organic salts, acids and bases are weak elctrolytes
From the compounds given above;
Strong electrolytes = Nitric acid HNO3,Potassium hydroxide KOH, Sodium bromide NaBr
Weak electrolytes = Formic acid HCOOH Ethyl amine CH3CH2NH2, Butanol C4H9OH
Non-electrolyte = Sucrose C12H22O11
2. The reaction between aqueous HBr and aqueous LiOH is shown innthe equation below:
HBr + LiOH ----> NaBr + H₂O
How tightly particles are packed determines what state it takes.
True or False
Answer:
True
Explanation:
tighter the molecules the slower it moves and the harder it gets
solid has very tight particles packed together
gas has its particles spread out
The sum of the kinetic energy and the potential energy of a particle is its
Answer:
he total mechanical energy E of a particle is defined as the sum of the kinetic and potential energies
Explanation:
Answer:
thermal energy
Explanation:
need help on assignment email me at shahlaalgow g mail . com
Explanation:
sure I will email you but it says that the email you have put is not correcthave a good day ☺️
As an FDA physiologist, you need 0.625 L of phosphoric acid acid / dihydrogen phosphate (H3PO4 (aq) / H2PO4 - (aq) ) buffer with a pH of 2.75. How do you prepare this solution from stock solutions of 1.0 M H3PO4 (formic acid) and 1.5 M NaOH
Answer:
0.4058L of 1.0M H3PO4
0.2192L of 1.5M NaOH
Explanation:
The pKa of the H3PO4 / H2PO4- buffer is 2.12
To solve this question we must use H-H equation for this system:
pH = pKa + log [H2PO4-] / [H3PO4]
2.75 = 2.12 + log [H2PO4-] / [H3PO4]
0.63 = log [H2PO4-] / [H3PO4]
4.2658 = [H2PO4-] / [H3PO4] (1)
Where [] could be taken as the moles of each reactant
As you have H3PO4 solution, the reaction with NaOH is:
H3PO4 + NaOH → H2PO4- + Na+ + H2O
As you can see, both H3PO4 and H2PO4- comes from the same 1.0M H3PO4 solution
The moles of H3PO4 are:
[H3PO4] = Moles H3PO4 - Moles NaOH
And for H2PO4-:
[H2PO4-] = Moles NaOH added
Replacing in (1):
4.2658 = [Moles NaOH] / [Moles H3PO4 - Moles NaOH]
4.2658 Moles H3PO4 - 4.2658 moles NaOH = Moles NaOH
4.2658 Moles H3PO4 = 5.2658 moles NaOH (1)
In volume:
0.625L = Moles H3PO4 / 1.0M + Moles NaOH / 1.5M
0.625 = Mol H3PO4 + 0.6667 Moles NaOH (2)
Replacing (2) in (1):
4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4 / 0.6667)
4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4) / 0.6667
4.2658 Moles H3PO4 = 5.2658*(0.9375 - 1.5 mol H3PO4)
4.2658 Moles H3PO4 = 4.9367 -7.8983 mol H3PO4
12.1641 mol H3PO4 = 4.9367
Mol H3PO4 = 0.4058moles * (1L / 1.0moles) =
0.4058L of 1.0M H3PO4
And:
0.625L - 0.4058L =
0.2192L of 1.5M NaOH
A student left a sealed jar of water outside her home. Water can be a solid,
liquid, or gas. When she put it outside, the water was a solid. Twelve hours
later, the water had changed phase and was a liquid. What happened to
the water molecules?
a) Before the student left, the molecules were moving in place. After, the molecules were moving around each other.
b) Before the student left, the molecules were moving around each other. After, the
molecules were moving away from each other.
c) Before the student left, the molecules were moving around each other. After, the
molecules were moving in place.
d) Before the student left, the molecules were moving away from each other. After, the
molecules were moving around each other.
i think the answer is d) Before the student left, the molecules were moving away from each other. After, the
molecules were moving around each other.
I am sorry if the answer is wrong
22.4 L is the volume of any gas regardless of atmospheric conditions.
O True
O False
Which element is similar to the properties bromine?
Answer: Fluorine
Explanation: It belongs in the same group as Bromine
Which of the following statements about C3 carbon fixation is true? a. C3 carbon fixation is an adaptation for plants exposed to high light intensity. b. C3 carbon fixation occurs in more plants than C4 carbon fixation. c. C3 carbon fixation is more common in areas of high temperatures than C4 carbon fixation. d. C3 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.
Answer: The answer is B
Explanation:
RiP BoZo. shout out to faze gabi staright up bopped potato girl.
Answer:
B
:D
Explanation:
The equation for the formation of ammonia from nitrogen and hydrogen is shown below. What is the formula for the equilibrium constant, Kc? {Hint, I’m just looking for letters/symbols, not numbers.}
H2(g) + N2(g) ⇌ NH3(g)
First, make sure to balance your equation.
3H2(g) + N2(g) ⇄ 2NH3(g)
Now, you can write your Kc expression. Remember that Kc is products over reactants, and the exponent for each product or reactant is based on its coefficient.
Kc = [NH3]^2 / [H2]^3[N2]
The reaction between nitrogen and hydrogen is called the Haber process. Kc for the reaction is the ratio of the concentration of ammonia to nitrogen and hydrogen.
What is the equilibrium constant?An equilibrium constant, kc is the concentration proportion of the products to the concentration of the reactants raised by their respective coefficients.
The balanced chemical Haber process is given as:
[tex]\rm 3H_{2}(g) + N_{2}(g) \leftrightharpoons 2NH_{3}(g)[/tex]
Now, the equilibrium constant for the reaction can be given as:
[tex]\rm Kc = \rm \dfrac{[NH_{3}]^{2}}{[H_{2}]^{3}[N_{2}]}[/tex]
Therefore, the ratio of the concentration of ammonia to hydrogen and nitrogen gives the equilibrium constant.
Learn more about the equilibrium constant here:
https://brainly.com/question/15116048
If I place a pot of water over a fire (heat source), what will happen to the water?
None of the water will get warm.
All of the water will get warm.
Only the water on top will get warm.
Only the water closest to the source will get warm
Answer:
C. All of the water will get warm.
Explanation:
The water will get warm all together but slowly, eventually when it hits a certain high heated temperature it will start to boil.
intermolecular dehydration of alkanols will gives what?
Answer:
One way to synthesize alkenes is by dehydration of alcohols, a process in which alcohols undergo E1 or E2 mechanisms to lose water and form a double bond. The dehydration reaction of alcohols to generate alkene proceeds by heating the alcohols in the presence of a strong acid, such as sulfuric or phosphoric acid, at high tempera (sorry if this is wrong )
7. The lowest whole-number ratio of the elements in a compound is called the
O empirical formula
O binary formula
O molecular formula
O representative formula
Answer: empirical formula is the answer. ur welcome.
Explanation:
Answer:
empirical formula
Explanation:
just took test
Scientists are trying to understand the composition of substances on
different planets. Which best describes how scientists are probably working
on this problem?
A. Scientists share information with other scientists who approach
the problem in the same way so that they get support for their
observations.
B. Scientists with different perspectives approach the problem in
various ways, but they all make observations and look for
patterns.
O C. Scientists with the same perspectives use similar experiments so
that they can compare results and draw the same conclusions.
D. Scientists study the problem in the same way because they have
similar backgrounds and share information with each other.
Can somebody please help me!!!!
Answer and Explanation:
The answer is Motion.
We can see that part of the image is blurry, which shows that the fish are moving fast. Moving = motion, so that means the fish has motion.
#teamtrees #PAW (Plant And Water)
Answer:
motion
Explanation:
True or False: Without electromagnetic energy, the world as we know it would not exist.
What is the formula of compound formed from a calcium ion and As? Express your answer as a chemical formula
Answer:
its chemical formula is Ca3N2
Explanation:
hope it will help
The air bags in automobiles were once inflated by nitrogen gas generated by the rapid decomposition of
sodium azide, NaN3.
2 NaNz (s) 2 Na (s) + 3 N2 (g)
If an air bag has a volume of 53.4 L and is to be filled with nitrogen gas at a pressure of 1.07 atm and a
temperature of 23.7°C, how many moles of NaNz must decompose? You may assume the Ny behaves as
an ideal gas.
Answer:
1.57 mol NaN₃
Explanation:
2 NaN₃ (s) → 2 Na (s) + 3 N₂ (g)First we use PV=nRT to calculate the number of N₂ moles that need to be produced:
P = 1.07 atmV = 53.4 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 23.7 °C ⇒ 23.7 + 273.16 = 296.86 KInputing the data:
1.07 atm * 53.4 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 296.86And solving for n:
n = 2.35 mol N₂Finally we convert N₂ moles into NaN₃ moles, using the stoichiometric coefficients of the balanced reaction:
2.35 mol N₂ * [tex]\frac{2molNaN_3}{3molN_2}[/tex] = 1.57 mol NaN₃Pleaseee helpp ASAP!!
How do temperature and pressure affect the volume of a gas?
Answer:
At constant pressure on increasing the temp volume also increases
and on increasing the pressure volume of given substance decreases !
Write the chemical symbols for three different atomic cations that all have 14 protons.
Explanation:
The symbols for three different cations with 14 protons are Si²⁺, Si⁴⁺, and Si³⁺. An element with 14 protons must be silicon, Si. Its electron configuration is [Ne] 3s²3p², so it could lose up to four valence electrons. The most likely cations are Si²⁺, Si⁴⁺, and Si³⁺ (or Si⁺)
Why is Potassium called an alkali metal?
Answer:
Explanation: potassium (Na) has one electron in outer shell
And it donates it easily and can even reduce
Hydrogen gas from water. An alkaline solution containing
Hydroxide ions (OH-) is then formed
Answer:
Because
Explanation:
Potassium is called Alkali metal because Potassium forms oxides which dissolve in water to form Alkali
Which process takes place in the conversion of iron into steel?
Iron is changed into steel by blowing oxygen through the molten metal from the Blast Furnace. This oxidises the impurities in the molten metal. Carbon is a major impurity in Blast Furnace metal.
What's the wavelength in meters of an electron traveling at 9.5 x 10^7 m/s? The mass of an electron is 9.11 x 10^-28 g.
Select one:
a. 7.66 x 10-15 m
b.7.66 x 10-12 m
c. 3.47 x 1027 m
d. 3.47 x 1030 m
Answer:
where:
• A is the wavelength in m.
• h = 6.626 x 10-34Js is Planck's
constant.
• m is the mass of the particle, such as the electron, in kg. The particle must have a mass for this relation to work.
• v is the forward velocity of the particle, in m/s.
Hence, the wavelength is:
6.626 x 10-34J.s
(9.1094 × 10 −³¹kg) (5 × 10³m/s)
We know that 1 J 1 kg. m²/s². So:
6.626 × 10-³4 g · m² / ø
9.1094 x 10 - 31) (5 x 105 m/s)
= 1.455 x 10-9 m
=
= 1.455 nm
Answer the following question by studying the given
structure of the stoma
1)Name the atoms of element
2)In which group of the periodic table do these element lie?
Answer:
1) A. carbon B. oxygen
2) A. semi metal. B. Non- metal( gas)
Click on an olive tree and read about it. Based on what you read, do you think the climate of Barcelona is very wet or rather dry? Explain.
Answer:
In the Autumn, Spring, and Winter, It is wet. In the Summer it is dry.
Explanation:
