CHEMISTRY HIGH SCHOOL

A gas changes directly to a solid during(1) fusion (3) saponification(2) deposition (4) decomposition

Answers

Answer 1
Answer:

Answer is: deposition.

Deposition is a thermodynamic process in which gas transforms into solid without passing through the liquid phase.  

For example, forming snow in clouds directly from water vapor.

During deposition phase change, energy is released.  

Another example, the phase change H₂(g) → H₂(s) is called deposition and the enthalpy change, ΔH, for this phase change has a negative (-) sign.  
Answer 2
Answer:

A gas changes directly to a solid during deposition, hence option 2 is correct.

How does Deposition take place?

Deposition is the process by which a substance goes straight from the gas to the solid state after cooling, bypassing the liquid state. Examples of substances that undergo deposition include naphthalene, camphor, iodine, and ammonium chloride.

The opposite is sublimation, through this process, a gas can become a solid without ever entering the liquid state. When gas particles get extremely cold, it happens.

Learn more about Deposition here:

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Which of the following mixture types can be filtered to remove solute? (1 point) suspensions only colloids only suspensions and colloids suspensions and solutions

Answers

The correct answer is suspensions only. The suspension is a heterogeneous mixture that contains solid particles that are largely enough to undergo sedimentation. Usually, these particles are about one micrometer which makes these solute to be very easy to be free from their solvent and be filtered.

The answer to your question is

suspensions only

You are giving an unknown element that dull in color. All you have to identify it is an electrical source and a meter that detects electrical charges. You would know it is a nonmetal if you turn on the electrical source and

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Metals conduct electricity while nonmetals do not. Therefore if when you turn on the electrical source and the devise indicates a current, you know the substance is a metal. If you turn on the electrical source and the devise indicates no current, the substance is a nonmetal. I hope this helps. Let me know if anything is unclear.

In 1989, the Exxon Valdez spilled nearly 42,000,000 liters of oil into Prince William Sound, Alaska. How would this spill be classified?Abiotic environmental
Biotic environmental
Genetic
Pathogenic

Answers

In biology and ecology, abiotic componentsor abiotic factorsare non-living chemical and physical parts of the environment thataffect living organisms and the functioning of ecosystems. Abiotic factorsand phenomena associated with them underpin all biology. So the oilspill is a non-living chemical

Correct Answer:

A. Abiotic environmental

3 of 3 points

How many moles of CaO form when 98.60 g CaCO3 decompose

Answers

The balanced reaction is:

CaCO3 = CaO + CO2

We are given the amount of CaCO3 to decompose when heated. This will be our starting point.

 

98.60 g CaCO3 ( 1 mol CaCO3 / 100.09 grams CaCO3) (1 mol CaO / 1 mol CaCO3 ) ( 56.08 g O2 / 1 mol CaO) =  55.25 g CaO

0.9851mol.                      This is the rt answer just did it

What is the half-life of sodium-24? EXPLAIN how you determined your answer.

Answers

The half life of sodium -24 is 15 hour.

What is half life?

The duration needed for an amount to decrease to half its original is known as the half-life.

What is sodium-24?

Sodium is a kind of element which has atomic number 11. It has three isotopes.

The radioactive isotope sodium-24, which is employed in blood tests in medicine, degrades through beta decay as well as seems to have an of 15.0 hours.

Therefore, the half life of sodium -24 is 15 hour.

To know more about half life.

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half-life is basically how long it takes for a radioactive molecule to get to 1/2 of its original mass.

so if sodium 24 mass was 5g and it's half life was 24years then:

after every 24years 1/2 of 5g would have decayed. so in 48years there will only be 2.5g left.

What happend if NH3+ HJ

Answers

Are you sure you copied that down correctly? I know what NH3 is but HJ I am comming up blank on. The only thing HJ I know is hebdojoule which is unit system.
Are you doing chemical balancing?
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