16 Which two gases can not be broken down by chemical means?(1) CO and He (3) Xe and He(2) CO and NH3 (4) Xe and NH3
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Final answer:
The two gases that cannot be broken down by chemical means are He (helium) and Xe (xenon).
Explanation:
According to the question, we are looking for two gases that cannot be broken down by chemical means. Chemical means refer to chemical reactions that break down compounds into their constituent elements. The options given are (1) CO and He, (2) CO and NH3, (3) Xe and He, and (4) Xe and NH3.
CO and NH3 are both compounds that can be decomposed by chemical means. However, both He (helium) and Xe (xenon) are noble gases that cannot be broken down by chemical means. This is because noble gases have stable electron configurations, making them unreactive and resistant to chemical reactions. Therefore, the correct answer is (3) Xe and He.
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Cu + 2AgNO3 = 2Ag + Cu(NO3)2
We are givent the amount of silver to be produced. This will be the starting point. Calculations are as follows:
3.50 mol Ag ( 1 mol Cu / 2 mol Ag ) = 1.75 mol Cu
Therefore, we need 1.75 mol of copper in order to produce 3.50 mol of silver.
Answer:
1.75 moles of copper must react to form 3.50 mol of Ag.
Explanation:
According to reaction 2 moles of silver are obtained from 1 mole of copper.
Then 3.50 mole of Silver will be obtained from:
1.75 moles of copper must react to form 3.50 mol of Ag.
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hi myself thx for the answers
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Answer:The mineral that reacts to hydrochloric acid (HCl) only when powdered is calcite. Calcite is a carbonate mineral composed of calcium carbonate (CaCO3). When calcite is in its powdered form, it readily reacts with hydrochloric acid to produce carbon dioxide (CO2), water (H2O), and calcium chloride (CaCl2). This reaction can be described by the chemical equation:
CaCO3 (s) + 2HCl (aq) → CO2 (g) + H2O (l) + CaCl2 (aq)
The reaction occurs because the surface area of the powdered calcite is increased, allowing for a greater contact area between the mineral and the hydrochloric acid. This increased contact area facilitates a faster and more vigorous reaction compared to when the calcite is in its solid, non-powdered form.
It's important to note that not all minerals react with hydrochloric acid. Only minerals that contain carbonate ions (CO3^2-) will react with hydrochloric acid to produce carbon dioxide gas. Other common minerals that exhibit this reaction include limestone and marble, which also contain calcium carbonate.
By understanding this reaction and its characteristics, you can identify calcite and other carbonate-containing minerals by their reaction to hydrochloric acid when in powdered form.
Final answer:
Calcite is a mineral that reacts to hydrochloric acid (HCl) only when powdered. This reaction produces carbon dioxide gas.
Explanation:
The mineral that reacts to hydrochloric acid (HCl) only when powdered is calcite.
When solid calcite is exposed to hydrochloric acid, it does not undergo any noticeable reaction. However, when powdered calcite is mixed with HCl, it readily fizzes and releases carbon dioxide gas.
This reaction occurs because the acid dissolves the calcite, converting it into dissolved calcium ions and carbon dioxide gas.
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TrueFalse
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Answer:
True it is a metaphor
Explanation:
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The law that can be applied here is Charle’s Law which states that for a fixed mass of gas and at constant pressure, the volume is directly proportional with the absolute temperature. It is represented by the equation of V1/T1=V2/T2. Since there is no negative volume, we will change the temperature into Kelvin, (-123+273=150K) and (70+273=300K). plugging in the values, V2 = (300K)(120mL/150K) we get a volume of 240mL.
2.)CH4+2O2-> CO2+2H2O
3.)N2+3H2-> 2NH3
4.)N2+O2-> 2NO
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Answer:
N2+O2-> 2NO
Explanation:
An endothermic reaction refers to a reaction in which heat taken in. This implies that heat is usually absorbed by the reaction system. The enthalpy of reaction for an endothermic reaction is always positive.
The triple bond between two Nitrogen atoms in N2 gas is very strong due to its small size and the triple bond thus the nitrogen molecule has a high dissociation energy. This accounts for the large amount of energy required to break the triple bond between nitrogen atoms in the nitrogen molecule. This causes the oxidation of Nitrogen molecule to NO to be largely endothermic.