A. Conducts heat readily \n    B. Changes the color of litmus paper to red \n    C. Reacts with bases to produce salts \n    D. Becomes negative when combined with other elements
200924
A\n\nAcid changes litmus to red. I am not sure what reacts with bases to produce salts. I am also not sure what becomes negative when exposed to other elements. You should review your chemistry properties.
415802
Hi Kitty,\nHere is what, I think, you need.\n\nExothermic, dH < 0, Entropy increases (dS > 0), Reaction is spontaneous and dG < 0\n\nExothermic, dH < 0, Entropy decreases (dS < 0), Reaction is spontaneous only at low temps, if |T dS| < |dH|\n\nEndothermic, dH > 0, Entropy increases (dS > 0), Reaction is spontaneous only  at high temps, if T dS > dH\n\nEndothermic, dH > 0, Entropy decreases (dS < 0), Reaction is not spontaneous, dG > 0
581623
You would find, if you had a sensitive enough measuring system, that the energy is dispersed through the acid as heat. \n\nWhen acid oxidises metal there is an initial activation energy required to break the metal lattice and that energy nromally comes from the heat already in the system. When the lattice is under stress sit requires far less energy to break down and the activation energy is lower. That means that more heat is retained by the system as heat.\n\nYou can see for yourself that a metal lattice under stress breaks down and oxidises more readily by simply bending an iron nail and dropping it in a few mm of salt water for a few days. The iron will rust almost exclusively where it was bent. That is because the  bend represents a point of stress in the lattice.\n\nWith less energy required to break down the metal alttice the overall reaction becomes more energetically positive and the amount of heat in the system increases.\n\nThe amount of additional heat this represents is tiny, but with an incredibly stable atmosphere and a very sensitive thermometer you would regeister the lost energy as a higher temperature than an identical beaker of acid with an uncompressed spring.
100044
The conducting ink forms a resistor which does load the battery.  The thermochromic strip lies along the resistor and responds to the heat it generates.  The resistor is tapered, so its resistance per unit length increases as it gets narrower, and so does the temperature due to current flow.  The point along the strip where the temperature reaches the color-change value depends on the amount of current flowing in the resistor.  Thus the length of the changed color section indicates battery freshness.  This is a very approximate test.  A better tester loads the battery similarly, but measures the battery voltage under such loading.
515830
Part A:  equilibruim to the right because more co3 added\n\nPart B:  Equilibrum to left becausemore co2 added\n\nPart C:  Equilibrium to right to replace removed h20\n\nEquilibruim dynamic because although appears stable ions constantly moving back and forth just at the same time
410526
For the forward reaction (from left to right), there is a decrease in enthalpy, which indicates it will tend to proceed as written, to products.\nThe entropy increases from left to right (products are gaseous), and this also favours the forward reaction to proceed to products.
524398
Flame tests show the color of the metal (the positive ion). The negative ion is usually nitrate (NO3) or sulfate (SO4) which are colorless.
33413
Tearing a paper involves overcoming the cohesive force between the cellulose fibres (of which paper is made). In the case of dry paper this force is high and hence tearing it is not very easy. However, the cohesive force that is of electrostatic origin becomes weakened in the presence of water.\n\nThis is akin to the way table salt (sodium chloride) dissolves in water due the weakening of the electrostatic attraction between the positively and negatively charged ions. In the case of paper, the effect becomes easily perceptible as paper is hydrophilic and absorbs water.\n\nOnce dipped in water, the water molecules can easily flow into the spaces between the fibres, weakening the cohesive force between them and making them susceptible to easy tearing.
362553
1.when sodium and chlorine combine they lose their harmful properties and become altogether new substance\n\n2.carbon di oxide\n\n3.bauxite(alumina)
178929
The different chemicals in the fuel change the color of the flame. For example, if you burn copper it turns blue/green. if you burn Lithium it turns red. Etc.
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1. Phys.\n2.Phys..\n3.Phys.\n4.Phys.\n5.Phys.\n6.Chem.\n7.Chem.\n\nChem. Ex:Burning, rusting. irreversable\n\nPhys:ripping, tearing, changes of state. reversable
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A) Valence Electrons\n\nI believe b, c and d show the results of the grouping not the reason they're grouped that way to start out with...\n \nb... No... The atom size increases instead of decreases\nc... No...\nc... No...  \nversa...
88647
It depends.\nThe salt has to dissolve in water.\nThe more ions / cm3 in te water (never mind the kind),\nthe better the electric conductivity.
128031
It's the way the molecules are formed in any particular "color" item and the light that gets absorbed by those molecules.  The light that doesn't light absorbed is the color you see.
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Chlorophyll is a rather complex and most of all large molecule, which means that the pure substance will be a solid.   In a leaf the chlorophyll is in solution.\n\nLeaves turning brown most likely involves encymatic digestion of parts of the molecule. The core construction of chlorophyll is quite hardy - a flat system of five- or six-atom rings with a central magnesium ion held in place by nitrogen atoms pointing to it in a square. (Hemoglobine and one of the vitamins have a similar basic structure, hemoglobine with iron in the centre and the vitamin with cobalt.)\n\nYou can dry a leaf and keep the chlorophyll intact at temperatures up to 120°C without any browning effect. Such a dried leaf will remain green, unlike a wet leaf where encymatic digestion will destroy the pigment.\n\nThe leaf will turn brown at temperatures where paper also begins to turn brown - when the cellulosis of the plant cells begins to split off water. This may start around 451°F...
56050
It is formed by heat pressure
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decrease\nthe greater the surface area of the reactant the more it is exposed to its other reactant, and more of it can react,  thus the reaction rate increases. This is the opposite for a decrease in the surface area.