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MR
Test #1 - Energetics
Assigned to Guests
by Trudy Jackson
Live Session
4 Questions
1
5
Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the following thermochemical information:
4B (s) + 3O2 (g)
→\rightarrow
→ 2B2O3 (s);
Δ\Delta
Δ H = -2509.1 kJ
2H2 (g) + O2 (g)
→\rightarrow
→ 2H2O (l);
Δ\Delta
Δ H = -571.7 kJ
B2H6 (g) + 3O2 (g)
→\rightarrow
→ B2O3 (s) + 3H2O (l);
Δ\Delta
Δ H = -2147.5 kJ
(click below to write/draw)
=
B2H6(G)
2B(S)+3H2
Show Your Work
2
5
Hydrogen cyanide can be prepared by the reaction:
CH4 (g) + NH3 (g)
→\rightarrow
→ HCN (g) + 3H2 (g)
What is the heat of reaction at constant pressure? Use the following thermochemical equations:
N2 (g) + 3H2 (g)
→ \rightarrow
→ 2NH3 (g);
Δ\Delta
Δ H = -91.8 kJ
C (graphite) + 2H2 (g)
→\rightarrow
→ CH4 (g);
Δ\Delta
Δ H = -74.9 kJ
H2 (g) + 2C (graphite) + N2 (g)
→\rightarrow
→2HCN (g);
Δ \Delta
Δ H = 270.3 kJ
(click below to write/draw)
3
5
Complete the following Born Haber cycle for barium phosphide, Ba3P2.
(click below to write/draw)
Show Your Work
4
5
Use bond energies to estimate
Δ\Delta
ΔH for the reaction below:
(click below to write/draw)
Show Your Work
You have responded to 1 of 4 questions.
Submit
1
2
3
4
gesture
keyboard_ar
Hydrogen cyanide can be prepared by the reaction:
CH4 (g) + NH3 (g)
→\rightarrow
→ HCN (g) + 3H2 (g)
What is the heat of reaction at constant pressure? Use the following thermochemical equations:
N2 (g) + 3H2 (g)
→ \rightarrow
→ 2NH3 (g);
Δ\Delta
Δ H = -91.8 kJ
C (graphite) + 2H2 (g)
→\rightarrow
→ CH4 (g);
Δ\Delta
Δ H = -74.9 kJ
H2 (g) + 2C (graphite) + N2 (g)
→\rightarrow
→2HCN (g);
Δ \Delta
Δ H = 270.3 kJ
Answer:
wait what?
Explanation:
Answer:
PLS EXPLAINNNNNNNNNNNNN
fill in the blank question
please help asap!!!!!!!!!!!!!!
Answer:
since unlike charges attract, negative side of another water molecule, neutral
What ion does sodium (Na) form
What mass of sodium hydroxide would be required to make 1.0L of a 0.75M solution of sodium hydroxide,
NaOH?
Given values are:
Volume, V = 1.0 L or, 1000 mLSolution, M = 0.75 MAs we know the relation,
→ [tex]M = \frac{W}{GM}\times \frac{1000}{V}[/tex]
or,
→ [tex]W = \frac{M\times GM\times V}{1000}[/tex]
By substituting the values, we get
[tex]= \frac{0.75\times 40\times 1000}{1000}[/tex]
[tex]= 30 \ g[/tex]
Thus the above response is right.
Learn more about volume here:
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There is 321 grams of H2SO4, how many molecules is this?
Answer:
The original number of oxygen atoms was about 80 times larger than Avogadro's number. Since each sulfuric acid molecule contains 4 oxygen atoms, there are about 20 moles of sulfuric acid molecules.
!! brainliest answer !! please help it's due tonight :)
Answer:
3. D
28. also known as Freon 12
Explanation:
What part of a chemical is represented by the letters
Answer:
It's compound? It's chemical compound would be represented my letters or numbers
Answer:
The letters in a chemical formula are the symbols for the specific elements. So for example, H means hydrogen, O means oxygen, S means sul fur, C u means copper, F means fluorine, Fe means iron and Au means gold.
Explanation:
Yea, Hope I helped
Brainly appreciated
pls pls pls help me, this is a test and I have no clue what do to. pls pls I need answers fast!
Answer:
12. B
13. D
14. D
15. A
Explanation:
If a species is unable to adapt within a
changing environment what can happen to
that species?
Answer:
That species will most likly go extinct.
Explanation:
When a species cant adapt, thay will have a hard time finding food, shelter ext. Because of this they will most likly die out.
Describe the behavior of water molecules during each stage of the water cycle.
Hurry pls this is due by the end of the class period so like 10 MINUTES HELP
Answer:
chupapi muano goagaag djdu
How many atoms are there in 0.075 mol of Pb
Answer:
There are 4.517x10^23 atoms of Zn in 0.750 mols of Zn
Explanation:
In a reaction vessel of 10.0 I, heat 9.00 g of water so that it partially decomposes. In the equilibrium mixture, 0.250 mol of water vapor is then still present. (a) Calculate the equilibrium constant K under the given conditions. (b) How is the equilibrium of the reaction affected by i. 1° reduction in volume ii. 2° increase in temperature?
Answer:
help
Explanation:
How much carbon will turn into carbon 14 every year?
Science
Please help asap
What are prevailing winds?
A) winds found along the equator that vary in speed
B) winds that change seasonally and vary in speed
C) winds found at the poles at a consistent speed
D) winds that blow in the same direction at a consistent speed
Answer:
D) winds that blow in the same direction at a consistent speed
Explanation:
i took the quiz got it right so i know the answer please trust me i know this is right i promise with all my heart
Plants respond to different kinds of stimuli. A plant's roots searching for water are an
example of what kind of response?
A. thigmotropism
B. phototropism
C. hydrotropism
D. gravitropism
Answer:
Explanation:
Hydrotropism
Al(s) +
Fe2O3(s)
Fe(s) + A1,0.3)
PER nuctives
When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?
Answer:
Explanation:
When a comet enters the solar system it curves towards the Sun due to the Sun's gravitational pull. Every celestial object in the universe has a gravitational pull whose force is dependent on the object's mass. The larger the object is the more gravitational pull it will have. The Sun is the largest object in our Solar system and therefore has the most gravitational pull. This is why the comet curves toward the Sun, but the opposite does not happen because the comet's gravitational pull is not strong enough to pull the Sun.
A car starts from rest. It takes 6.0 seconds for the car to accelerate to 5 m/s2 W. What is the final velocity?
Answer: 30 m/s
Explanation:
Use the first kinematic equation for linear motion
[tex]V=V_i+at\\V=0+(5)(6)\\v=30m/s[/tex]
Solution A has a pH of 3, and solution B has a pH of 5. Which statement best
describes these solutions?
A. Solution B is more acidic than solution A
B. Solution A is acidic, and solution B is basic.
C. Solution B is less acidic than solution A.
O D. Solution A is basic, and solution B is acidic.
Answer:
The answer will be C
Explanation:
Solution A has a pH of 3, and solution B has a pH of 5 "Solution B is less acidic than solution A".
What is pH ?The chemical circumstances of such a solution are reflected by pH, which is an essential quantity. The pH might influence nutritional availability, biological functioning, microbial activity, as well as chemical behavior.
What is acidic?Acidic substances were characterized by a sour flavor. An acid is a molecule that can give an H+ ion while remaining energetically stable.
It is known that if pH ≥7 then solution will be acidic
Hence, solution B is less acidic than solution A.
Therefore, the correct answer will be option (C).
To know more about acidic and pH .
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k2co3 major species present when dissolved in water
When K2CO3 is dissolved in H2O (water) it will dissociate (dissolve) into K+ and CO3 2- ions. To show that they are dissolved in water we can write (aq) after each. The (aq) shows that they are aqueous – dissolved in water.
The major species present in the solution when K₂CO₃ dissolved in water are K⁺, CO₃²⁻ , and HCO₃⁻.
What is the interaction between salt and water?When salt is added to water, the salt dissolves because the ionic bonds in the salt molecules are weaker than the covalent bonds of water. The salt dissolves in water at the molecular level due to electrical charges. Due to the fact that both salt and water are polar.
The bonds in salt are ionic bonds and to dissolve the salt, the positively-charged side of the water is attracted to the negatively-charged ions of salt and the negatively-charged side of the water is attracted to the positively-charged ions of salt.
The dissociation of the potassium carbonate in water:
K₂CO₃ (aq) → 2K⁺ (aq) + CO₃²⁻ (aq)
H₂O (l) → H⁺ (aq) + OH⁻ (aq)
Carbonate ions are combined with hydrogen ions from water:
CO₃²⁻ (aq) + H⁺ (aq) ⇆ HCO₃⁻ (aq)
Therefore, K⁺, CO₃²⁻ , and HCO₃⁻ ions are present when K₂CO₃ dissolved in water.
Learn more about the interaction between salt and water, here:
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How many milliliters are in 458 liters?
Answer:
458000
Explanation:
30 N
60 N
20 N
Net force:
Resulting force:
Answer:
Net force: 110 N
Resulting Force: 24.7289837 pounds-force
Explanation:
First you would add 30+60+20N which would be 110N
110N would equal to the 24.72898937 pounds of force.
help me with both number 8 and 9, I actually pressed commensalism for both of them, please be sure of your answer, first one to answer gets brainliest!
Answer:
8 is mutualism and 9 is commensalism
Explanation:
2. in Journey to the Center of the Earth, by Jules Verne, an adventurer travels through the
layers of Earth until he reaches the center. While it is not possible actually to travel through
all of the layers of Earth, in what order would the adventurer have traveled to reach the
center? Rearrange the layers into the correct order Place the outer layer at the top and the
innernost layer at the bottom
1 Crust
3 Outercore
2 Mantie
4 Inner Core
How many grams of water can be heated from 25°C to 70°C using 15,000 J?
The picture shows a diver constructing artificial reef in a shallow area of the ocean. artificial reef is intended to affect the ocean ecosystem by-
A. removing pollution from the water
B. Providing shelter for marine organisms
C. Causing sediment to erode into deeper waters
D. Preventing people from overfishing along the shore
Answer:
Everyone, the answer is actually B. Providing shelter for marine organisms
Explanation:
We just went over this question in class, this is the right answer. Causing sediment to erode in the waters just doesn't make any sense.
The materials which are used to construct artificial reefs includes rocks, wood, old tires, etc. The artificial reef affect the ocean ecosystem by providing shelter for marine organisms. The correct option is B.
What is an artificial reef?An artificial reef is defined as the manmade structure which may mimic some of the characteristics of the natural reef. The submerged shipwrecks are the most common form of artificial reef. The oil and gas platforms, bridges, etc. and other offshore structures are also function as artificial reefs.
From tourism to marine recreation and also for sport fishing, the reefs play an important role in local economies. They are also important for the health of the ocean and provides habitat for the variety of marine life and support the ocean ecosystems.
The artificial reefs are generally constructed to protect and enhance or restore the components of the marine ecosystems.
Thus the correct option is B.
To know more about artificial reefs, visit;
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What are facts about Cells
Why does increasing temperature generally increase the rate of a chemical reaction?
A. It increases the amount of reactant
B. It decreases the size of the reactant particles.
C. It causes the particles of the reactants to move faster and collide more often.
D. It increases the space between reactant particles so they have more room to move apart
We have 548 grams of CaCl2. How many molecules of CaCl2 do we have? (The molar mass of CaCl2 is 110.98 g/mol)
Group of answer choices
2.97 x 10^24 molecules
3.66 x 10^28 molecules
9.1 x 10^22 molecules
4.37 x 10^22 molecules
Answer:
Try everything
2.97 x 10^24 molecules
3.66 x 10^28 molecules
9.1 x 10^22 molecules
4.37 x 10^22 molecules
Explanation:
To find the volume of a ring, the water displacement method was used.
What is the volume of the ring with correct significant figures?
Answer:
4 cm³?
Explanation:
68-64
No one is helping me
Answer:
displacement =1025km
time=6hours
Explanation:
velocity=displacement /time=1025/6=170.8km/h