Answer:
Net ionic equation:
Ca⁺²(aq) + CO²⁻₃(aq) → CaCO₃(s)
Explanation:
Chemical equation:
K₂CO₃ + CaCl₂ → KCl + CaCO₃
Balance chemical equation:
K₂CO₃(aq) + CaCl₂(aq) → 2KCl(aq) + CaCO₃(s)
Ionic equation:
2K⁺(aq) + CO²⁻₃(aq) + Ca⁺²(aq) + 2Cl⁻(aq) → 2K⁺(aq) + 2Cl⁻(aq) + CaCO₃(s)
Net ionic equation:
CO²⁻₃(aq) + Ca⁺²(aq) → CaCO₃(s)
The K⁺(aq) and Cl⁻ (aq) are spectator ions that's why these are not written in net ionic equation. The CaCO₃ can not be splitted into ions because it is present in solid form.
Spectator ions:
These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
The net ionic equation for the reaction between K2CO3 and CaCl2 is Ca2+(aq) + CO3^2-(aq) --> CaCO3(s). This is obtained after removing the spectator ions (K+ and Cl-) from the full ionic equation.
The subject of discussion is the net ionic equation for the given chemical reaction between K2CO3(aq) and CaCl2(aq). An ionic equation represents the ions that are present in a chemical reaction, and a net ionic equation only shows the ions that actually participate in the reaction.
To form the net ionic equation, we first write the complete ionic equation. In this case, K2CO3(aq) breaks down into 2 K+(aq) + CO3^2-(aq), and CaCl2(aq) breaks down into Ca2+(aq) + 2 Cl-(aq). The products would be 2 K+(aq) + 2 Cl-(aq) + CaCO3(s).
The net ionic equation is then formed by canceling out the spectator ions (ions that do not participate in the reaction). Here, the spectator ions are K+ and Cl-. So, the net ionic equation is: Ca2+(aq) + CO3^2-(aq) --> CaCO3(s)
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Answer:
Gamma radiations, because they have the most energy.
Explanation:
Gamma radiations:
Gamma radiations are high energy radiations having no mass.
These radiations are travel at the speed of light.
Gamma radiations can penetrate into the many materials.
These radiations are also used to treat the cancer.
Lead is used for the protection against gamma radiations because of its high molecular density.
The lead apron are used by the person when treated with gamma radiations.
Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings.
Answer: C: Gamma rays, because they have the most energy
i took the test this is the correct answer
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Answer:
Scientific advancements can detect some harmful events before they occur and it allows the society to plan for them, thereby reducing the risk of damage that occurs.
Explanation:
Scientific advancements reduce the natural disasters level in a region by evaluating the physical and chemical characteristics of the land.
Also, it develops new medical terminology and concepts that reduce the spread of hazardous diseases in society.
Satellites are used to predict the weather report and by using this report proper precautions can be taken at the time of floods and storms.
Construction of dams and canals highly reduced the risk of water overflowing in the lands.
Answer: Scientists are able to detect and predict some hazardous events through scientific advancements. By detecting these events early, society can prepare for the events, thereby reducing the amount of damage to people and property caused by the hazardous event.
Explanation: This is the exact answer on edge2020
2. AlCl3
3. H2O
4. Cu
Among the substances listed, copper (Cu) is the one that can't be decomposed by a chemical change. This is because it is an element, composed of a single type of atom, and does not break down further in a chemical reaction.
The substance that cannot be decomposed by a chemical change among the given options is Cu, which stands for copper. In the context of chemistry, substances that cannot be decomposed into simpler substances by chemical means are called elements. Copper, denoted by the symbol Cu, is one such element. Unlike compounds such as HI, AlCl3, and H2O, elements like copper are composed of a single type of atom and therefore cannot be broken down further through chemical reactions.
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The substance that cannot be decomposed by a chemical change is Cu (Copper) because it is an element and cannot be broken down into simpler substances through chemical changes.
The substance among the options provided that cannot be decomposed by a chemical change is Cu or Copper. This is because Copper is an element, and elements are substances made up of only one type of atom. They cannot be broken down into simpler substances by chemical reactions. On the other hand, HI (Hydroiodic acid), AlCl3 (Aluminum chloride), and H2O (Water) are all compounds, which consist of two or more elements chemically combined in a fixed ratio. These can be decomposed into their constituent elements through various chemical reactions.
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