Answer:
514 kJ
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableElementsCompoundsMolesStoichiometry
Analyzing Reactions rxnUsing Dimensional AnalysisExplanation:
Step 1: Define
Identify
[Given] rxn (balanced): 2Si (s) + 2Cl₂ → 2SiCl₂ (g) + 687 kJ
[Given] 106 g Cl₂
[Solve] kJ heat
Step 2: Identify Conversions
[rxn] 2 mol Cl₂ → 687 kJ
[PT] Molar Mass of Cl: 35.45 g/mol
Molar Mass of Cl₂: 2(35.45) = 70.9 g/mol
Step 3: Stoichiometry
[DA] Set up: [tex]\displaystyle 106 \ g \ Cl_2(\frac{1 \ mol \ Cl_2}{70.9 \ g \ Cl_2})(\frac{687 \ kJ}{2 \ mol \ Cl_2})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 513.554 \ kJ[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
513.554 kJ ≈ 514 kJ
Topic: AP Chemistry
Unit: Thermochemistry
A list of changes is shown. Temperature decreases Intermolecular bonds become weaker Melting Intermolecular bonds become stronger Temperature remains constant Temperature increases Vibration of molecules slows down Molecules vibrate faster Which of the above changes would be accompanied by an increase of the kinetic energy of particles in a solid? (4 points)
Answer:
Intermolecular bonds become weaker
Melting
Temperature increases
Molecules vibrate faster
Explanation:
In the solid phase, intermolecular forces are found to be strongest. However, as the temperature is increased, the molecules of the solid begin to vibrate faster and intermolecular forces between them begin to weaken.
As intermolecular forces of a substance become weaker, the substance melts. The molecules in the liquid state possesses greater kinetic energy than the molecules in the solid state.
Hence the the answer above.
Answer:
B, C, F, and H
Explanation:
These are all things that happen in the increase of the kinetic energy of particles in a solid.
B. Intermolecular bonds become weaker
C. Melting
F. Temperature increases
H. Molecules vibrate faster
Also, just took the test and got it right.
can someone explain the answer.
Answer:
A
Explanation:
Alkanes undergo substitution reaction with halogen molecules in the presence of light. This reaction occurs by free radical mechanism and the initiation step is the formation of the halogen radical.
The propagation steps involves the abstraction of a hydrogen from the alkane by the halogen radicals.
The termination steps involves the coupling of alky radicals.
Thus for the reaction of ethane and chlorine;
C2H6 + Cl2 -------> C2H5Cl + HCl
copper +sulfur + oxygen =
An experiment was done to discover the right amount of water to use on a plant. Seeds were planted in three identical pots. The plants were given the following amounts of water each day for forty days. Pot 1, 50mL; Pot 2, 100mL, Pot 3, 150mL. The height of each plant was measured at the end of the experiment.
What is the independent variable in this experiment?
The amount of water is the independent variable in this experiment.
What is plant?Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria). By one definition, plants form the clade Viridiplantae (Latin name for "green plants") which is sister of the Glaucophyta, and consists of the green algae and Embryophyta (land plants). The latter includes the flowering plants, conifers and other gymnosperms, ferns and their allies, hornworts, liverworts, and mosses.
Most plants are multicellular organisms. Green plants obtain most of their energy from sunlight via photosynthesis by primary chloroplasts that are derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic or mycotrophic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize, but still have flowers, fruits, and seeds. Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common.
Learn more about plant
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Question Number 6 of 10 - 8th Grade Science
A group of people were concerned about a new coal-burning power plant that might be built in their
neighborhood. What is probably their main concern?
The heat from burning coal can drive
generators that produce electricity
There is more coal in the earth than
there is oil and gas,
Burning coal produces sulfur dioxide
which contributes to acid rain.
Burning coal produces more heat
than burning wood
Answer:
Most likely burning coal produces silver dioxide with can cause acid rain
Explanation:
Only one answer comes with a negative consequence. All the others are either
1. Explaining the benefits of coal, such as it producing more heat
2. Stating that there is more coal than any other natural resource
3. Coal being more convenient
The radiostope radon 222 has a half life of 3.8 days. How much of a 73.9-g sample or radon 222 wouppd be left after 23 days ?? pls show an equation
Answer:
Is there a picture for it
Explanation:
because it would be a hard
What is the mass of 0.850 mole of SO2?
Answer:
[tex]1 \: mole \: of \: sulphurdioxide \: weighs \: 64 \: g \\ 0.850 \: moles \: will \: weigh \: (0.850 \times 64) \: g \\ = 544 \: g[/tex]
The mass of 0.85 mol of sulfur dioxide has been 54.4 grams.
Moles can be calculated as the ratio of the mass to the compound to the molecular mass. The moles can be expressed as:
Moles = [tex]\rm \dfrac{mass}{molecular\;mass}[/tex]
Mass = moles [tex]\times[/tex] molecular mass
The molecular mass of sulfur dioxide = Mass of sulfur + 2 [tex]\times[/tex] mass of oxygen
= 32 + 2 [tex]\times[/tex] 16
= 32 + 32
= 64 g/mol
The given moles of sulfur dioxide = 0.850 mol
The mass of sulfur dioxide = 0.850 [tex]\times[/tex] 64
The mass of sulfur dioxide = 54.4 grams.
The mass of 0.85 mol of sulfur dioxide has been 54.4 grams.
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an unknown gas diffuses 1.25 times faster than CO2 gas. What is the molar mass of the unknown gas?
Answer:
28.16 g/mol
Explanation:
From Graham's law;
Let the rate of diffusion of gas X be 1.25
Let the rate of diffusion of CO2 be 1
Molecular mass of gas X= M
Molecular mass of CO2 = 44g/mol
1.25/1=√44/M
(1.25/1)^2 = 44/M
1.5625 = 44/M
M= 44/1.5625
M= 28.16 g/mol
How many moles are equal to 3.0x10^23 atoms of germanium? PLS ANSWER WITH WORK!
Help me and thanks YESSIR :) 10 points :)
Answer:
pen??????l think l m not sure
State three pieces of evidence from the diagram which indicate that the plant is pollinated by wind. ( 3 marks)
Your image is saying "Can't load image on this device."
1) list at least four uses of metals from your day to day life.
Answer:
alloy,copper,gold, silver,cobalt
Explanation:
30 points please no links!) A sea star has one of its arms break off. That arm grows into its own separate organism through __________. a. sexual reproduction c. spindle fibers b. regeneration d. chromosomes Please select the best answer from the choices provided A B C D
Answer:
B) Regeneration
the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.
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A sea star has one of its arms break off. That arm grows into its own separate organism through [tex]\sf\purple{regeneration}[/tex].
b. regeneration ✅
[tex]\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{♡}}}}}[/tex]
EJEMPLOS DE SOLUCIONES QUÍMICAS EN LA NATURALEZA
ahí esta la respuesta espero que te sirva
Which equation represents the correct net ionic equation for the reaction between Ca(OH)2 and H2SO4?
Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.
2 upper H superscript plus, plus 2 upper O upper H superscript minus right arrow upper H subscript 2 upper O.
Upper C a superscript 2 plus, plus 2 upper O upper H superscript minus, plus upper S upper O subscript 4 superscript 2 minus right arrow upper C a superscript 2 plus, plus upper S upper O subscript 4 superscript 2 minus, plus 2 upper H subscript 2 upper O.
Upper C a (upper O upper H) subscript 2 plus upper H subscript 2 upper S upper O subscript 4 right arrow upper C a upper S upper O subscript 4 plus 2 upper H subscript 2 upper O.
Answer: The correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]
Explanation:
Net ionic equation is defined as the equations in which spectator ions are not included.
Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.
The balanced molecular equation is:
[tex]Ca(OH)_2(aq)+H_2SO_4(aq)\rightarrow CaSO_4(aq)+2H_2O(l)[/tex]
The complete ionic equation follows:
[tex]Ca^{2+}(aq)+2OH^-(aq)+2H^+(aq)+SO_4^{2-}(aq)\rightarrow 2Ca^{2+}(aq)+SO_4^{2-}(aq)+H_2O(l)[/tex]
As calcium and sulfate ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]
Hence, the correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]
Answer:
B. no reaction
Explanation:
What factor makes it possible for animals with endoskeletons to grow larger than animals with exoskeletons?
A. Endoskeletons can be removed and replaced.
B. Endoskeletons are lighter than exoskeletons.
C. Endoskeletons are made of fluid-filled tubes.
D. Endoskeletons lack joints that can break down.
i need help
If a shell can hold a maximum of 32 electrons, what is the value of n?
Answer:
The value of N would be 4.
Explanation:
The equation would be 2n^x = 32 and therefore, 4.
water is to ____as liquid is to soild
water is to gas as liquid is to solid
Answer in 6 min plz ..............
Answer: The chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
Explanation:
An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).
The element losing electron (metal) forms a positive ion known as a cation while the element gaining electron (non-metal) forms a negative ion known as an anion.
Element X has the atomic number 11 which is sodium. The electronic configuration of it is [tex]1s^22s^22p^63s^1[/tex]
This element will lose 1 electron to form [tex]X^+[/tex] ion of [tex]Na^+[/tex]
Chlorine has the atomic number 17. The electronic configuration of it is [tex]1s^22s^22p^63s^23p^5[/tex]
This element will gain 1 electron to form [tex]Cl^-[/tex] ion
When these two ions combine, they lead to the formation of an ionic compound having a chemical formula of [tex]XCl[/tex] or [tex]NaCl[/tex]
Hence, the chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
3. give reasons
(a) A gas fills completely the
vessel in which it is kept.
(b)A gas exerts pressure on the
walls of the container
(c) A wooden table should be
called a solid
(d) We can easily move our hand
in air but to do the same
through a solid block of wood we need a karate
expert
we need a karate expert.
Answer:
A.A gas exerts pressure on the walls of the container. Reason: They have high kinetic energy and negligible force of attraction to move constantly moving with high speed in all directions. ... These collisions of the gas particles with the container walls exert pressure on the walls of the container.
B A gas exerts pressure on the walls of the container due to imapact of its gas molecules with hight velocity .
C.A wooden table should be called a solid. Reason: It has a definite shape and volume. It is very rigid and cannot be compressed, i.e., it has a solid characteristic.
D.We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and pass through it.
Explanation:
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Barbara is conducting an experiment to observe heat flow. She places one piece of metal in a freezer at -18 degrees Celsius (°C) and a second piece of metal in an oven at 200 °C. After 2 hours, she takes the metal pieces out of the freezer and oven and places them both in the same beaker of boiling water for two minutes. Which of the following best describes how some of the heat will initially move in this system?
Heat will flow from the frozen metal into the hot metal.
Heat will flow from the boiling water into the hot metal.
Heat will flow from the boiling water into the frozen metal.
Heat will flow from the frozen metal into the boiling water.
Answer: The correct answer is heat will flow from the boiling water into the frozen metal.
Explanation:
According to the law of conservation of energy, energy cannot be destroyed nor created but it can be transformed from 1 form to another form.
There are 3 processes of heat transfer:
Conduction: This type of heat transfer occurs when there is direct contact between the two objects.Convection: This type of heat transfer occurs when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Radiation: This type of heat transfer occurs when there is a direct transfer of energy through space.The heat moves from a hot surface to a cold surface to maintain equilibrium.
We are given:
A metal is placed in a freezer (cold object) and another metal is placed in an oven (hot object) and then both the metals are placed in boiling water.
Initially, the heat will flow from the boiling water (hot object) into the frozen metal (cold object) to maintain equilibrium
Hence, the correct answer is heat will flow from the boiling water into the frozen metal.
What is the dewpoint if the dry bulb tempature is 18C and the relative humidity is 64% 1.14C 2.11C 3.9C 4.4c
Answer:
I think 11.1 degrees Celsuis
Explanation:
Let me know if i'm right coz im not too sure.
Which of these statements are true? Select all that apply. The Delta.Hf for Br2(I) is 0 kJ/mol. The Delta.Hf for He(I) is 0 kJ/mol. The Delta.Hf for Hg(I) is 0 kJ/mol. The Delta.Hf for Cl2(g) is 0 kJ/mol. The Delta.Hf for N2(I) is 0 kJ/mol. CORRECT ANSWER IS A, C, AND D.
Answer: The correct options are A, C and D.
Explanation:
Enthalpy of formation is defined as the change in the enthalpy when 1 mole of a chemical substance is formed from its pure element at standard conditions. It is represented by the symbol [tex]\Delta H_{f}[/tex]
Enthalpy of formation for elemental atoms is always equal to 0.
We know:
Bromine (Br) exists in a liquid state.
Helium (He) exists in a gaseous state.
Mercury (Hg) exists in a liquid state.
Chlorine (Cl) exists in a gaseous state.
Nitrogen (N) exists in a gaseous state.
For the given options:
The [tex]\Delta H_{f}[/tex] for [tex]Br_2(l), Hg(l)\text{ and }Cl_2(g)[/tex] will be equal to 0 because they are formed by the natural states of their elemental atoms.
Hence, the correct options are A, C and D.
A substance in its standard state has an enthalpy of formation of 0 kJ/mol.
The enthalpy of formation of a substance in its standard state is 0 kJ/mol.
The standard state of a substance refers to its state at 1 atm and at a temperature of 298 K. Bearing this in mind, we can now identify the true and false statements.
So,
ΔHf for Br2(I) is 0 kJ/mol - True
ΔHf for He(I) is 0 kJ/mol - False
ΔHf for Hg(I) is 0 kJ/mol - True
ΔHf for Cl2(g) is 0 kJ/mol - True
ΔHf for N2(I) is 0 kJ/mol - False
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Which substance cannot be broken down by chemical means? (1)aluminum(2)ammonia(3)aluminum oxide(4)ammonium chloride
Answer:
(2) Ammonia I hope you good luck
(1) aluminum
A substance that cannot be broken down into chemically simpler components is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is a compound.Let's look at all the options first:
Ammonium chloride appears to sublime upon heating but actually decomposes into ammonia and hydrogen chloride gas.Aluminum oxide is a compound. As it breaks down, it enables the pure aluminum underneath it to react as well.Aluminum, which is used in soda cans, is an element thus it cannot be broken down by chemical means.Ammonia is a compound it can be broken down down into simpler components.Learn more:
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If voume is held constant (the width remained the same in the simulation), what happens to P as T increases?
оа
It remains the same
Oь
It decreases
oc
It depends- it can either increase or decrease randomly
d
It increases
Answer:
If there is a decrease in the volume there is less space for molecules to move and therefore they collide more often, increasing the pressure. If there is an increase in the volume the molecules have more space to move, collisions happen less often and the pressure is decreased.
Explanation:
If there is a decrease in the volume there is less space for molecules to move and therefore they collide more often, increasing the pressure. If there is an increase in the volume the molecules have more space to move, collisions happen less often and the pressure is decreased.
que tipos deagua oxigenada hay
Answer:
El agua oxigenada se encuentra en cuatro concentraciones diferentes expresadas “en tanto por ciento”: 8%, 30%, 35% y 50%. Sin embargo, hay quien prefiere hablar de “volúmenes” y no de “porcentajes”.
Explain the method of preparation of alkyl halides using phosphorus halide
Answer:
The phosphorus first reacts with the bromine or iodine to give the phosphorus(III) halide. These then react with the alcohol to give the corresponding halogenoalkane, which can be distilled off
hope this helps bby<3
B The allusions recall specific locations and horrors of the Vietnam conflict.How many moles of H2O are produced when 12 moles of NH3 reacts with excess O2?
4 NH3 + 5 O2 → 4 NO + 6 H2O
Group of answer choices
18 moles H2O
12 moles H2O
6 moles H2O
9 moles H2O
Answer: 18 moles of [tex]H_2O[/tex] will be produced.
Explanation:
We are given:
Moles of ammonia = 12 moles
The given chemical equation follows:
[tex]4NH_3+5O_2\rightarrow 4NO+6H_2O[/tex]
By the stoichiometry of the reaction:
4 moles of ammonia produces 6 moles of water
So, 12 moles of ammonia will produce = [tex]\frac{6}{4}\times 12=18mol[/tex] of water
Hence, 18 moles of [tex]H_2O[/tex] will be produced.
How many neutrons does this atom have?
4
6
10
14
Answer:
6
Explanation:
Electrons are floating around, and protons are outside of the nucleus center. The ones in the center are neutrons. I hope this helps.
What is the electron structure of an oxygen atom?
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