CHEMISTRY MIDDLE SCHOOL

What are the two fundamental portions of an atom?​

Answers

Answer 1
Answer: Number of Protons in an Uncharged Atom
The two main components of an atom are the nucleus and the cloud of electrons. The nucleus contains positively charged and neutral subatomic particles, whereas the cloud of electrons contains tiny negatively charged particles.

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Can a tank of oxygen gas ever be half empty? explain

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No, it is practically very unlikely situation. Oxygen is a gas and gas has no shape it occupies the shape of the container. moreover, according to the kinetic theory of gases, the particles of gas move in random motion occuping the space. The particles move randomly and keep on colliding with each other. Therefore, it is not correct to say that a tank of oxygen gas can ever be half empty.
The answer is yes. The compacted air moves to the sifter bed channels. The strainer bed channel assumes an imperative part, as the gadget expels the nitrogen from the air. After air is first compacted in the concentrator, it is constrained into the primary strainer bed. Oxygen is sent into the item tank.

flight of a bald eagle is about 50 km a scientist measured an eagle flying 80 km how is this possible

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The AVERAGE flight of a bald eagle is 50 km/h. so that means it can go higher or lower than that speed. it's not that it can only go a maximum of 50 km/h 
Hope this helps. :)

Explain why an empirical formula alone cannot be used to derive the actual molecular formula for a given compound. Provide one or more examples.

Answers

The empirical formula tells the proportion of atoms or elements which are

present in a compound and not the exact number of atoms.

The molecular formula tells the exact number of atoms or molecules present

in a compound. An example is H₂0 which tells us that Hydrogen has two

atoms and oxygen has one.

Empirical formula talks about the proportion or ratio in which the molecules

are represented in the compound. This is however the major difference

between the both of them.

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Answer:

Molecular formulas indicate how many atoms there are of each element in a compound, while empirical formulas indicate the reduced proportion of elements in a given compound. The molecular formula can be achieved through the empirical formula if the molecular weight of the compound is known, therefore the empirical formula alone cannot be used to obtain the molecular formula.

Explanation:

An empirical formula expresses the relative relationships of the different atoms in a given compound. For example, H2O is made up of two hydrogen atoms and 1 oxygen atom. In the same way, 1.0 mol of H2O is made up of 2.0 mol of hydrogen and 1.0 mol of oxygen. .

The molecular formula for a compound is always the empirical formula. The molecular formula can be obtained from the empirical formula if the molecular weight of the compound is known.

On Sunday NASA's SpaceX launched 4 astronauts into space for a mission lasting 5 months. They named their spacecraft RESILIENCE.In 4-6 sentences explain what the word RESILIENCE means to you. Also, why do you think they named their spacecraft that? Please respond to this prompt in your own words, there is no need to google!

!!DO NOT GOOGLE IT!!

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Answer: I think they named it RESILIENCE to point out that it should be resilient to harsh conditions and that it would be able to push through with little damage. when I hear the word resilience I think of strong able to push through. I think of myself of resilient because _________________. Naming the space craft RESILIENCE is smart because the astronauts will know they are safe when they launch.

Explanation:

What kinds of scientific investigations involve making observations?

Answers

1. Coherence Theory (Theory of Coherence)

Based on this theory, a knowledge considered to be true if the knowledge kehoren with the knowledge that exists and has been proven to be true. In the study of mathematics this is usually called the deductive nature.

2. Correspondence Theory (Theory of corespondence)

Based on this theory, a knowledge considered to be true if the knowledge of having a relationship with a reality that is true. This theory is based on the empirical fact that knowledge is true if there are facts that support that is true knowledge. Thus the truth here is based on inductive inference.

3. Pragmatic Theory (Theory of Pragmatism)

According to this theory, knowledge is said to be true if the knowledge is seen practically completely or have properties that true practicality. Followers of this theory argue that knowledge is true if it has keguanaan practical.

Answer:

the hypothesis is the anawer.

Which is the best example of immiscible liquids?

Answers

"Lava lamps": the liquid is a plastic with a very low melting point. 

"lighter fluid" and whiskey: lighter fluid is xylene and it does not mix with either ethanol nor water. 

Silicon lubricant and milk: silicon oil is similar to ordinary oil. Milk contains emulsifiers to dissolve oil, but I doubt these work with silicon. 

Gasoline and grape juice: gasoline is a hydrocarbon and these compounds don't mix with sugar nor water.
Oil and water. Immiscible liquids do not mix.
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