Which sample of matter is a mixture?
(1) Br2(ℓ) (3) KBr(s)
(2) K(s) (4) KBr(aq)
Answers
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In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot.Which of the following type of reaction has occurred?A) endothermic B) exothermic C) reversible D) irreversible
Which sample has particles with the lowest average kinetic energy?(1) 1.0 g of I2 at 50.°C(2) 2.0 g of I2 at 30.°C(3) 7.0 g of I2 at 40.°C(4) 9.0 g of I2 at 20.°C
Decomposers
Primary consumers
Secondary producers
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Answer: Primary producers
A food chain is a linear series of transfer of food and energy when one organism is consumed by the other organism in an ecosystem. The energy is distributed among different tropic levels of the food chains.
Phytoplankton is a class of unicellular simple, autotrophic organisms which are found in water of ocean, lakes and or any other freshwater body. These includes dinoflagellates, diatoms, cynobacteria, green algae and others. These organisms are abundantly present in the ecosystem in the lower most trophic level. They are called as primary producers because they are consumed by other organisms such as zooplanktons, fishes and large sea mammals.
B.It is the sum of internal energies of two or more substances.
C.It is the portion of internal energy that can be transferred from one substance to another.
D.It is the portion of potential energy that can be transferred from one substance to another.
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Thermal energy is the difference between internal energies of two or more substances. Therefore, option A is correct.
What is thermal energy ?
The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is done in the process.
The average kinetic energy of the system's component particles as a result of their motion makes up the thermal energy of the system. The sum of the kinetic and potential energies of the system's component particles represents the system's overall internal energy.
Thermal energy is also referred to as heat energy. A moving object's kinetic energy is its energy. Thermal energy is a type of kinetic energy because it is produced by moving particles.
Thus, option A is correct.
To learn more about thermal energy, follow the link;
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Answer:
Tha answer I s D. Hope it will work to u
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Answer: Option (D) is the correct answer.
Explanation:
It is known that relation between pressure and force is that, pressure equals force divided by area.
Mathematically, P =
where P = pressure
F = force
a = area
Hence, when there is increase in number of gas particles in a container the there will be more number of collisions due to increase in number of particles. This will lead to greater collision force and as a result there will be increase in pressure because force is directly proportional to pressure.
Thus, we can conclude that the sequence more collisions --> greater collision force --> higher pressure best describes the result of increasing the number of gas particles in a container best describes the result of increasing the number of gas particles in a container.
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I hope this helps. Let me know if anything is unclear.
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Answer:
Atomic Radius can be simply defined as the distance between the last shell of electrons and the nucleus of an atom.
Answer: The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. Illustrated Glossary of Organic Chemistry - Atomic radius. Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell. ... Atomic radius differs with the bonding state of an atom (for example a nonbonded atom of an element versus the same element within a covalent bond). Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.
hope this helps..... Stay safe and have a great weekend!!!! :D
FALSE
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Answer:
FALSE
Explanation:
Critical temperature can be defined as the temperature at which a substance can exist as a liquid. Below the critical temperature, the substance will freeze and above the critical temperature, the substance will evaporate.
Note: Liquid cannot evaporate below it's critical temperature