Chemical Reactions

It remains unchanged

It increases

It fluctuates during the reaction

It decreases

Barium sulfate

Sodium nitrate

Sodium sulfide

Barium nitrite

It decreases both activation energy and overall enthalpy change (ΔH) of the reaction.

It lowers the activation energy without altering the position of equilibrium or thermodynamic properties such as ΔH and ΔS.

It raises activation energy thus shifting equilibrium towards products.

It increases entropy (ΔS), driving non-spontaneous reactions towards spontaneity.

Single replacement

Decomposition

Double replacement

Synthesis

Raising temperature sufficiently to surpass activation energies for all steps involved.

Adding catalysts that only affect later stages in reaction sequence but not earlier ones where bottleneck occurs.

Decreasing concentrations of intermediate species formed during early stages.

Increasing pressure without changing concentrations nor temperature conditions throughout process.

Double replacement

Combustion

Single replacement

Synthesis

Mazes

Hydroxides

Oxides

Halides

One reactant decomposes into two or more products.

Two reactants fuse to form one product.

A compound reacts with an element causing a switch in elements within the compound.

It involves the exchange of ions between two compounds to form two new compounds.

Ignoring surrounding temperture variations assuming they negligible effect internal energetics reaction

Assuming constant volume calorimeter adequate despite knowing expansion gases occurs

Accounting potential heat losses surroundings comprehensive system insulation strategies calibration equipment

Focusing soleley quantity hydrocarbon used neglecting purity combusted material

pH decreases since additional water reduces overall ionic strength, favoring dissociation of the weak acid and lowering the pH.

pH stays the same because the autoprotolysis of water is not significantly impacted by the dilution of low concentrations of weak acid and conjugate base.

No predictable change occurs as unpredictable interactions among various ions weaken predictiveness about the pHydroxide levels.

pH increases due to decreased ratio of acid/base concentration, increasing hydroxide ion concentration and thereby raising the pH.