Chemical Reactions
If the enthalpy change for a reaction is slightly endothermic but it leads to an increase in disorder, under which condition is the reaction most likely to be spontaneous?
At lower temperatures
At higher temperatures
Only at standard conditions
It will never be spontaneous
What is the general result when an alkali metal from group one reacts directly with a halogen from group seventeen?
Salt formation
Acid production
Dissociation into ions
Precipitate formation
In which compound would you expect the bond between atoms to be primarily covalent due to similar electronegativity values?
HCl
Cl2
CaO
KCl
What distinguishes a combustion reaction from a synthesis reaction when magnesium reacts with oxygen to form magnesium oxide?
A combustion reaction involves the release of energy as heat and light, whereas a synthesis reaction forms a more complex compound.
In both reactions, magnesium oxide decomposes into its elements.
A synthesis reaction requires an electric spark, while a combustion reaction does not.
Both reactions produce carbon dioxide as a byproduct.
What is formed when potassium reacts with water?
Potassium chloride and oxygen gas
Potassium permanganate and water vapor
Potassium oxide and hydrogen peroxide
Hydrogen gas and potassium hydroxide
Which compound will be produced alongside carbon dioxide during a combustion reaction of propane (C₃H₈)?
Methane.
Carbon monoxide.
Water vapor.
Hydrochloric acid.
What is the process called when an acid and a base react to form water and a salt?
Acid-base neutralization
Dehydration synthesis
Redox reaction
Hydrolysis

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What is the difference between acid-base reactions and oxidation-reduction reactions?
Acid-base transfers protons and oxidation-reduction transfers electrons.
Acid-base transfers pH and oxidation-reduction transfers charge.
Acid-base transfers charge and oxidation-reduction transfers pH.
Acid-base transfers electrons and oxidation-reduction transfers prptons.
A net ionic equation usually must contain what to distinguish the compounds?
Only the compounds that react -- no spectator ions.
All of the above.
The phase of matter, to highlight precipitates.
Appropriate coefficients.
What is released when an exothermic reaction occurs?
Electricity
Light
Heat
Sound