A sample of a substance has these characteristics:• melting point or 9811 K
• hard. brittle solid at room temperature
• poor conductor of heat and electricity as a solid
• good conductor of electricity as a liquid or in an aqueous solution
This sample is classified as
(1) a metallic element
(2) a radioactive element
(3) a molecular compound
(4) an ionic compound

Answers

Answer 1
Answer: Those characteristic belong to an ionic compountd. Ionic compounds have strong bonds between their atoms (ionic bond is the strongest molecular bond) which conferes this kind of compounds high melting point, wich 9811 K is. Ionic compounds do not transmit current, because they do not have free electrons, like metals do, then they are poor conductors as solid. Ionic compounds dissolve in water into ions which are charges that can move, becoming then good conductors. The structure of ionic compound is a net of cristals which make them hard and brittle. Then, the answer i s option (4) an ionic compound.
Answer 2
Answer:

Answer:

an ionic compound

Explanation:


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Which processes result in the release of carbon? Select three options.Animals break down food molecules to obtain energy.
The remains of producers are broken down by decomposers.
The remains of consumers are broken down by soil decomposers.
Producers take in carbon dioxide.
Producers make sugars and starches.

Answers

The three processes that releasecarbon are as follows:

  • Animals break down food molecules to obtain energy.
  • The remains of producers are broken down by decomposers.
  • The remains of consumers are broken down by soil decomposers.

  • Carbon moves back and forth from living organisms to the atmosphere in a process summarized by CARBON CYCLE. In the carbon cycle, carbon is either absorbed or released in series of processes.

WAYS THROUGH WHICH CARBON IS RELEASED:

  • Animals break down food molecules to obtain energy in a process called CELLULAR RESPIRATION. Carbon is released into the atmosphere in form of carbon dioxide (CO2).

The remains of producers (plants) are broken down by decomposers (fungi, bacteria etc). Carbon is returned back to the soil this way.

The remains of consumers, when they die, are broken down by soil decomposers (fungi, bacteria).

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Answer:

Animals break down food molecules to obtain energy.

The remains of producers are broken down by decomposers.

The remains of consumers are broken down by soil decomposers.

Explanation:

JUST TOOK THE TEST

What is a tough, rigid, outer covering that protects some cells and gives them shape?

Answers

it iscalled the "cell wall"

What does the drop in barometric pressure from 1003 millibars to 926 millibars tell  you about a hurricane?

Answers

The pressure has decrease meaning the hurricane is less powerful

The pressure has decrease meaning the hurricane is less powerful

Which compound is an electrolyte?(I) CH3CHO (3) CH3COOH

(2) CH3OCH3 (4) CH3CH2CH3

Answers

Ch3COOH is an electrolyte for sure. So option “C” is the correct answer for this question. Electrolyte is actually a compound that dissolves easily in water and creates a solution that becomes a good conductor of electricity. The reason why the solution becomes a good conductor of electricity is due to the presence of free ions. There can be both strong and weak electrolytes. The compounds that release small number of free ions on dissolving in water are called weak electrolytes and those that release large number of ions are strong electrolytes.


The Correct answer is CH3COOH

The explanation:

when the electrolyte is: A substance that dissociates into ions in solution and acquires the capacity to conduct electricity.

- Electrolyte is actually a compound that dissolves easily in water and creates a solution that becomes a good conductor of electricity.

- The existence of free ions is the reason why the solution becomes a good conductor of electricity.

-The compounds that release small number of free ions on dissolving in water are called weak electrolytes

-and those that release large number of ions are strong electrolyte.

acetic acid partially dissociates in water to form two ions, H+ and CH3COO- , therefore making it a weak electrolyte

What is a particle diagram to illustrate the composition of air

Answers

A particle diagram showing the composition of air would represent various gases like nitrogen, oxygen, water vapor, and carbon dioxide as spheres of different colors. The proportions between these gases would be shown by having a majority of nitrogen and oxygen spheres as they make up most of our atmosphere. The diagram may also include symbols for dust particles and particulate matter.

A particle diagram to illustrate the composition of air would visually represent the mixture of gases that comprise our atmosphere. Primarily, the atmospheric mix includes nitrogen (N₂; 78.6 percent), oxygen (O₂; 20.9 percent), water vapor (H₂O; 0.5 percent), and carbon dioxide (CO₂; 0.04 percent).

Each of these gases exist as molecules, with nitrogen and oxygen being diatomic. In other words, their molecules consist of two atoms.

In such a diagram, each type of atom would be represented as a sphere of a different color, for instance, nitrogen atoms might be blue, oxygen red, hydrogen white, and carbon grey.

The proportions would be represented by having a larger number of nitrogen and oxygen spheres compared to water vapor and carbon dioxide.

Furthermore, there might be additional entities in the diagram to represent dust particles or other environmental particulate matter suspended in the air. This allows us to get a qualitative understanding of the composition of Earth's atmosphere and mechanisms that drive gas exchange.

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A diagram of the composition of air would be the air's chemical formula and it's structure. 

What type of ion does an acid produce?

Answers

An acid produces hydrogen ions.
Acid releases H+(hydrogen ions) in solutions.

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