This statement is FALSE. Mercury was not first discovered in the sun. In fact, mercury or quicksilver was discovered by ancient Indians and Chinese even before 2000 BC. Its ores that are called cinnabar are used in traditional Chinese medicines. However, the effectiveness is not yet justified because of the toxicity of the element. Mercury is also used with thermometers both in clinical and lab uses. Nowadays, the use of it in thermometers is gradually disappearing because of its harmful properties.
(2) density and specific heat capacity
(3) malleability and thermal conductivity
(4) solubility and molecular polarity
Answer:
The correct option is: (4) solubility and molecular polarity
Explanation:
Chromatography is an analytical technique which is used for the separation of various components in a given mixture.
In this process, the mixture to be separated is first dissolved in the mobile phase, which carries it through the stationary phase, thus leading to separation of the various components.
This differential separation is the result of the differential migration which is based upon the solubility and polarity of the individual components of of the given mixture.
(1) decreases (2) increases (3) remains the same
Answer: (2) increases
Explanation: Entropy is the measure of randomness or disorder of a system. More is the random arrangement of molecules in a system , more is the entropy of the system. More ordered is the arrangement of molecules in a system, less is the entropy of the system.
When carbon dioxide sublimes, it means solid carbon dioxide is directly changing to gaseous state without undergoing into liquid state, thus the molecules will be more random and thus the entropy will increase.
A...thermal energy to chemical energy
B....electromagnetic energy to chemical energy
C....kinetic energy to potential energy
D...potential energy to chemical energy
During photosynthesis, sunlight shining on a plant is absorbed. The energy transformation occurs during this process is thermal energy to chemical energy.
Photosynthesis is a process by which the plants make their food. The process takes sunlight, water, and chlorophyll into food.
Thus, the correct option is A.thermal energy to chemical energy.
Learn more about photosynthesis
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B. shells
C. electrons
D. protons
b. a covalent compound because it has a low boiling point
c.an ionic compound because it has a low melting point
d.a covalent compound because it has a low melting point
Answer: A solid compound in a sealed container is a covalent compound because it has a low melting point.
Explanation:
Ionic compounds have strong electrostatic forces which are strong in nature and cannot be broken down at low temperature.
Whereas covalent compounds have Vanderwaal forces which are weak in nature. Therefore, covalent compounds melts at low temperature.
Thus, it can be concluded that a solid compound in a sealed container is a covalent compound because it has a low melting point.
Answer: The answer is d
Explanation:
They are both carried from place to place by particles.
B.
They are both kinds of mechanical energy.
C.
They both need a medium to travel through.
D.
They both have a wavelength and a frequency.
Explanation
D.
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