CHEMISTRY HIGH SCHOOL

A few pieces of dry ice, CO2(s), at -78°C are placed in a flask that contains air at 21°C. The flask is sealed by placing an uninflated balloon over the mouth of the flask. As the balloon inflates, the dry ice disappears and no liquid is observed in the flask.State the direction of heat flow that occurs between the dry ice and the air in the flask.
Write the name of the process that occurs as the dry ice undergoes a phase change in the flask. [1]
Compare the entropy of the CO2 molecules in the dry ice to the entropy of the CO2 molecules in the inflated balloon.

Answers

Answer 1
Answer:

Answer:

  • Heat flows from the air into the dry ice.
  • Sublimation (its when a solid becomes a gas without becoming a liquid first).
  • CO2 molecules in gaseous phse has more entropy than in solid phase.

Explanation:

  • To sublimate dry ice needs to fain energy, wich is provided by the surrounding air.
  • Solid is the more condensated state of matter, so it has less entropy than any other state of matter.
Answer 2
Answer: The direction of heat flow is from surroundings to system (air to ice), the dry ice is subliminating.

Related Questions

Hydrogen, when combined with oxygen in a chemical reaction, forms water. This is an example of which type of chemical reaction? I think its single displacement but I am not sure.
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Which statement explains why increasing thetemperature increases the rate of a chemical reaction, while other conditions remain the same? (1) The reacting particles have less energy and collide less frequently. (2) The reacting particles have less energy and collide more frequently. (3) The reacting particles have more energy and collide less frequently. (4) The reacting particles have more energy and collide more frequently.
Determine the mass of oxygen in a 5.8 g sample of sodium bicarbonate (NaHCO3).
How many moles are in 30 grams of H3PO4?

Which phrase describes the molecular structure and properties of two solid forms of carbon, diamond and graphite?(1) the same molecular structures and the same properties(2) the same molecular structures and different properties
(3) different molecular structures and the same properties
(4) different molecular structures and different properties

Answers

Answer is: (4) different molecular structures and different properties.

Different forms of the same element that have different properties because of different atom arrangements are called allotropes.  

Carbon has many allotropes, but two most important are graphite and diamomd.  

Graphite has sp2 and diamond has sp3 hybridization of carbon atoms, because of that graphite conduct electricity and diamond not.  

In diamond carbon atoms are arranged in the face centered cubic crystal structure called a diamond lattice.  

Diamond has very strong covalent bonds between carbon atoms and because of that it has the highest hardness and thermal conductivity of any bulk substance.  
The answer is (4) different molecular structures and different properties. The graphite has the structure of layer and diamond has the structure of regular tetrahedron.

How many liters of oxygen gas can be produced if 28.7 grams of water decomposes at 294 Kelvin and 0.986 atmospheres? Show all of the work used to solve this problem. . . 2 H2O (l) --->2 H2 (g) + O2 (g)

Answers

2 H₂O (l) → 2 H₂ (g) + O₂ (g) 

Molar mass water = 1.01 x 2 + 16.00 = 18.02 g/mol 

Number of mol water decomposed = 28.7 g H₂O x [1 mol / 18.02g] = 1.59 mol H₂O 

From the balanced equation 2 mol H₂O decomposes to 2 mol H₂ and 1 mol O₂ 

so the mole ratio water : oxygen = 2 : 1 

and number of mol O₂ produced = ½ x 1.59 = 0.796 mol O₂ 


The ideal gas law is PV = nRT 

so V = nRT/P 

P = 0.986 atm 

V = ? 

n = 0.796 

R = 0.0821 L atm K⁻¹ mol⁻¹ 

T = 294K 

V = 0.796 x 0.0821 x 294 / 0.986 

V = 19.5 L 

So 19.5 L O₂ gas are produced

I hope my answer has come to your help. Thank you for posting your question here in Brainly.

Which scientist first attempted to construct a periodic table based on an element's atomic mass? A. Mendeleev B. Newton C. Dalton D. Moseley

Answers

A. The Russian chemist Dmitri Mendeleev 

Answer:

The correct answer is A.

Explanation:

The periodic table published by Mendeleev in 1869 was the first periodic table to group the elements. Based on the hypothesis that the properties of the elements are a periodic function of their atomic weights, he placed in the table all the elements known up to that moment, which became 63 elements, ordering them in such a way that the elements belonging to the same family appear in the same vertical line. The elements were arranged in the increasing order of their atomic masses.

Have a nice day!

What is the Ka’aba?an Islamic deity
a Muslim pilgrim
a book of Sharia laws
an ancient stone temple

Answers

Answer: Ka'aba is Muslim pilgrimage

Explanation: Kaaba is a small shrine located in Mecca and is considered as a sacred spot by Muslims.

It is a cube shaped structure made up of graystone and marble. It's corners correspond to the points of a compass and is mostly kept covered with a cloth called kiswah.

Answer:

D. An ancient Stone Temple

Explanation:

Edg 2021

A gas changes directly to a solid during ....fusion
saponification
depositon
decomposition

Answers

The answer is Deposition.

Whh is most carbon compound poor conductor of electricity
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Answers

Explanation:

Most of the carbon compound are convalent in nature and all of the electrons participates in bond formation as such there is no free electrons left to conduct electricity. Moreover carbon compound doesn't readily dissociates to form ions, which conduct electricity. Hence carbon compound are poor conductor of electricity.

Answer:

It is because all the valence electrons are used to form covalent bonds. So, there will be no electrons left to flow the electric current through them.

Explanation:

hope it helps
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