Answer:
A. Solid
Explanation:
that is what creates a solid state. the particles are moving slowly enough (the matter is cold enough) that stable structures between them can be established. so, they get close together and create e.g. grids.
(2) NaOH (4) NH4NO3
The compound whose dissolution in water will produce energy would be NaOH.
These are reactions that produce energy in the form of heat.
In other words, a reaction in which the heat is given off to the environment is said to be exothermic, whereas, the reverse is endothermic.
When NaOH is dissolved in water and the temperature of the reaction vessel is recorded, one would see that heat is given off by the dissolution process. Thus, the dissolution is exothermic.
More on exothermic reactions can be found here: brainly.com/question/10373907
Answer: Option (2) is the correct answer.
Explanation:
A chemical reaction in which reactants absorb energy is known as an endothermic reaction. Also, in this reaction energy of reactants is less than the energy of products.
For example, when ammonium chloride is dissolved in water then the solution becomes cold as the reaction is endothermic in nature.
Whereas a chemical reaction in which energy is released is known as exothermic reaction. Also, in this type of reactions energy of reactants is more than the energy of products.
For example, when NaOH is dissolve in water then heat is released as it dissociates into sodium and hydroxide ions. Further, product formed that is, species sodium and hydroxide ions acquire low energy state. Hence, the reaction is exothermic in nature.
Thus, we can conclude that NaOH is the compound in which process of dissolving in water is exothermic.
fraction of the original amount of radium-226 in a sample will still be radium
after 8,000 years?
C.
D.
SUBMIT
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Answer:
Thermohaline Circulation
Explanation:
The process is known as “Thermohaline Circulation”. In the Earth’s polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.
76 In the space in your answer booklet, draw a Lewis electron-dot diagram for the compound that tarnishes silver. [1]
77 In the ground state, an atom of which noble gas has the same electron configuration as the sulfide ion in Ag2S? [1]
Silver tarnishes due to the chemical reaction with hydrogen sulfide, forming silver sulfide. A Lewis dot structure for H2S shows sulfur at the center bonded to two hydrogen atoms. The sulfide ion in Ag2S has the same electron configuration as the noble gas neon.
The chemical compound that tarnishes silver is hydrogen sulfide, H2S. In terms of Lewis electron dot structures, hydrogen sulfide, H2S, would be modelled as an S atom at the center surrounded by two H atoms. Each H atom is bonded to the S atom by a shared pair of electrons, represented by a single line. In the sulfide ion S2- (which is a part of Ag2S), there are additional 2 electrons to the sulfur atom, making a total of 8 valence electrons, which is the same electron configuration as the noble gas neon.
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The compound that tarnishes silver is silver sulfide (Ag2S), and its Lewis electron-dot diagram can be drawn by representing the valence electrons. The sulfide ion in Ag2S has the same electron configuration as the noble gas argon (Ar).
A Lewis electron-dot diagram is a representation of the valence electrons in an atom or a compound. The compound that tarnishes silver is silver sulfide (Ag2S). The Lewis electron-dot diagram for Ag2S can be drawn by representing the valence electrons of each element.
The sulfide ion in Ag2S has the same electron configuration as the noble gas argon (Ar). This means that the electron configuration of the sulfide ion is 1s2 2s2 2p6 3s2 3p6.
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