In a laboratory investigation, magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. This reaction is represented by the unbalanced equation below.Mg(s) + HCl(aq) ==>H2(g) + MgCl2(aq)
State, in terms of the relative activity of elements, why this reaction is spontaneous.
Answers
The reaction depicted by the equation would be spontaneous because Mg is higher in reactivity than H.
Reactivity series of cations
The reactivity series of anions is such that: K, Na, Ca, Mg, Al, Zn, Fe, Sn, Pb, and H.
Ions at the higherposition in the reactivity series are able to displace those in lower positions in chemical reactions. Whereas, those in lower positions cannot displace those in higher positions.
Mg is far higher than H in the reactivity series, and thus, will be able to displace Hfrom HCl without any forceful procedure.
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Answers
Answer:
0.01917 m^3/kg.
Explanation:
Given:
P = 15 MPa
= 1.5 × 10^4 kPa
T = 350 °C
= 350 + 273
= 623 K
Molar mass of water, m = (2 × 1) + 16
= 18 g/mol
= 0.018 kg/mol
R = 0.4615 kPa·m3/kg·K
Using ideal gas equation,
P × V = n × R × T
But n = mass/molar mass
V = (R × T)/P
V/M = (R × T)/P × m
= (0.4615 × 623)/1.5 × 10^4
= 0.01917 m^3/kg.
Final answer:
The specific volume of superheated water vapor under the conditions of 15 MPa pressure and 350°C temperature, using the ideal gas equation, is approximately 0.01919 cubic meter per kilogram.
Explanation:
The question is asking to calculate the specific volume of superheated water vapor using the ideal gas equation P = ρRT, where P is the pressure, ρ is the density (inverse of specific volume), R is the gas constant, and T is the temperature.
To find the specific volume (v), we need to rearrange the ideal gas equation to v = RT/P. Given that the pressure P = 15 MPa = 15000 kPa, the gas constant R = 0.4615 kPa.m³/kg.K, and the temperature T = 350°C = 623.15 K (adding 273 to convert °C to K), we can substitute these values into our rearranged equation balance to calculate for v.
The specific volume v = (0.4615 kPa.m³/kg.K * 623.15 K) / 15000 kPa = 0.01919 m³/kg. So, the specific volume of superheated water vapor under the given conditions is approximately 0.01919 cubic meter per kilogram.
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Answers
Answer:
A figure of the thermometer for this problem is not given so I cannot really give a specific answer. Maybe this would help. The minimum temperature would be the lowest reading possible in the thermometer. Most probably it is option C or D. Hope this helps.
Answers
The positive energy protons and negative electrons balance out.
(2) Magnesium conducts electricity.
(3) Magnesium reacts with an acid.
(4) Magnesium has a high boiling point.
Answers
Justification:
1) Malleability, conduction of electricity, and boiling point are physical properties.
2) Maleability is the ability to be transformed into foil. It is just a change in form. So, it is a physical property.
3) The metals conduct electricity in virtue of the array of the atoms, which permtis the flow of the electrons, but it does not involve a chemical change, so it remains being a physical proerty.
4) Boling point is the temperature at which a substance passes from liquid state to gas state, which are just different forms of the same substance. So, it is other physical property.
5) Reaction with an acid is indeed a chemical transformation: the metal (magnessium) will form a chemical bond with some spieces of the acid to form a new compound. This is a chemical reaction in virtue of the chemcial properties of the substance (its ability to react with acids)
Magnesium reacts with an acid.
Answers
Answer : The correct option is A substance that increases concentration when it is dissolved in water.
Explanation :
Arrhenius Definitions :
- Arrhenius Acid : It increases the concentration of hydronium ion
in an aqueous solution. In other words, a substance dissociates in water to form
ion.
- Arrhenius Base : It increases the concentration of hydroxide ion
in an aqueous solution. In other words, a substance dissociates in water to form
ion.
Answer:
b
Explanation:
Answers
Fluidity is the physical property that enables a substance to flow. Fluidity also refers to the state of being fluid. So basically, solid molecules has no fluidity. It is also believed that the fluidity of water increases as the water gets warmer.