Answer:
Option (C).
Models help scientists visualize things they can'tsee
Explanation:
Since a long time models have been used by scientists to study about various things and phenomenons. A model helps the scientist community understand things that they cannot actually see or fathom. It can be thought of as a thinking tool, to help form explanations. It represents physical and touchable visualization of the theory rather than imaginative.
Models are useful simplifications to aid understanding. It can then be used to explain further phenomena and to make predictions of future behavior. Hence, models are very helpful for scientists in various studies.
Answer:
AI-generated answerScientists use models for several reasons:
1. Models make some things easier to understand: Models are simplified representations of complex phenomena or systems. They help scientists break down complicated concepts into simpler components, making it easier to understand and study.
2. Models help scientists visualize things they can't see: Many scientific phenomena occur at scales that are too small or too large to observe directly. Models allow scientists to visualize these phenomena by creating representations that are more manageable and observable. For example, scientists use models to understand atomic structures or celestial bodies.
3. Scientists can analyze models to make predictions: Models provide a way for scientists to test and analyze various scenarios without directly manipulating the real system. By adjusting variables in the model, scientists can make predictions about how the real system might behave under different conditions. This allows them to gain insights and make informed decisions without the need for costly or time-consuming experiments.
4. Measurements can be made only on models: In certain situations, it may be difficult or impossible to make direct measurements on the real system. In such cases, scientists can create models that replicate the behavior of the system and make measurements on the model instead. This allows them to gather valuable data and draw conclusions about the real system. It is important to note that while models are valuable tools for scientific understanding, they are not always perfectly accurate representations of objects or phenomena. Models are simplified versions of reality, and they may not capture all the complexities or intricacies of the real system. Scientists continuously refine and improve models based on new evidence and observations.
Explanation:
It became so cold during the course of the night, making it hard enough just to skate on. or the lake had frozen completely due to the extreme weather outside.
one of the key circumstances for the existence of matter. Traditionally, matter may exist in three different states: solid, liquid, or gas. For instance, the same chemical exists in the three different states of ice, liquid water, plus steam.
Plasma, a state of matter that is electrically neutral, is frequently regarded as the final state of matter. The lake's temperature rose because it became so cold during the course of the night, making it hard enough just to skate on. or the lake had frozen completely due to the extreme weather outside.
Therefore, the lake had frozen completely due to the extreme weather outside.
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Answer:
The lake went from a liquid to a solid
Explanation:
Since it was so cold overnight, the temperature of the lake increased to the fact that it turned hard enough to skate on. or The temperature outside was so cold it froze the lake solid
Answer:
Radius of the steel ball is 4.6mm
Explanation:
Hello,
To find the radius of the steel, we'll have to calculate it from it's volume which can be gotten from the density of the material.
Data;
Mass = 3.25g
Density = 7.86g/cm³
Density = mass / volume
Volume = mass / density
Volume = 3.25 / 7.86
Volume = 0.413cm³
Volume of a steel = 4/3πr³
0.413 = 4/3 × π × r³
0.413 = 1.33 × 3.14 × r³
0.413 = 4.1762r³
r³ = 0.413 / 4.1762
r³ = 0.099
Take the cube root of both sides
r = 3√(0.099)
r = 0.46cm
From metrics table
1cm = 10mm
0.46cm = x mm
x = (0.46 × 10)
x = 4.6mm
The radius of the steel ball is 4.6mm
Valence electrons are the electrons that reside in an atom's outermost shell. The role of valence electrons in determining an atom's reaction makes them crucial. You can count how many electrons are at the highest energy level by writing an electron configuration.
How do the valence electrons function?
The electrons in an atom's outermost shell are called valence electrons. … Because the electrons in the outermost shells of two atoms are the first to come into contact with one another and are the ones that control how an atom will react in a chemical reaction, when two atoms interact.
The outer-shell electrons of an atom are known as valence electrons. The valence electrons in an atom control its reactivity.
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Answer:
Explanation:
An ionic compound is a compound in which electrovalent bonds joins the atoms together. Here, electrons move from a less electronegative atom to a more electronegative one. The formation of ionic bonds involves the transfer of elecrons.
The transfer of electrons makes the atoms charged i.e ionized. These oppositely charge ions establishes an electrostatic force of attraction to form the ionic compounds.
How is electrical neutrality maintained in an ionic compound?
Electrical neutrality is maintained in an ionic compound because the compound is made up of ions in which the net charge is zero. There is a transfer of electrons which is completely recieved by the more electronegative atom.
Answer: Option (B) is the correct answer.
Explanation:
A covalent compound is a compound whose atoms are bonded together by sharing of electrons.
Also it is known that in covalent compounds weak inter molecular forces of attraction exists. Due to which it is easy to break the bond between atoms.
Hence, covalent compounds have low melting and boiling point .
Other properties of covalent compounds are as follows.
Thus, we can conclude that out of the given options property that is typical of a covalent compound is that they have low melting and boiling points.
Answer: the correct option is (C).
Explanation:
Covalent compounds have lower melting and boiling points due to presence of weak inter-molecular forces by which molecules are weakly associated to each other. Hence, melting and boiling of covalent compounds occurs at low temperatures.
Usually, Covalents compounds have following properties:
A.
Heat always flows from cooler objects to warmer objects.
B.
Heat always flows from warmer objects to cooler objects.
C.
Heat never travels in a similar pattern.
D.
Heat never transfers from solids to liquids.