Most Missed/Difficult Chemistry Regents Questions

Front

What is the balanced equation for the fermentation of glucose?

Back

C6H12O6(AQ) → 2 CH3CH2OH(AQ) + 2 CO2(G)

Front

Define a hydrocarbon.

Back

A hydrocarbon is a compound consisting entirely of hydrogen and carbon.

Front

What does an endothermic reaction entail?

Back

An endothermic reaction absorbs heat from its surroundings.

Front

What is the significance of an orbital in the wave-mechanical model?

Back

An orbital is a region of space in an atom where there is a high probability of finding an electron.

Front

What is oxidation in terms of electron transfer?

Back

Oxidation is the loss of electrons during a chemical reaction.

Front

What is the formula for calculating the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol)

Front

What is the principle of conservation of mass?

Back

The principle states that mass is neither created nor destroyed in a chemical reaction.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond is formed by the transfer of electrons, while a covalent bond is formed by the sharing of electrons.

Front

What is the pH scale used for?

Back

The pH scale measures the acidity or basicity of a solution.

Front

What is a catalyst?

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed.