SNC2D - DLP - Chemical Reactions

What is a synthesis reaction?

• A reaction where a compound is broken down into simpler compounds

• A reaction where two elements switch places in a compound

• A reaction where simple materials combine to make something more complex

• A reaction where a compound containing carbon and hydrogen combines with oxygen

Answer explanation

A synthesis reaction is a type of chemical reaction where simple materials combine to make something more complex. In this reaction, two or more substances combine to form a new, more complex substance. The given answer aligns perfectly with this definition, hence it is the correct choice.

What is a decomposition reaction?

• A reaction where a compound is broken down into simpler compounds

• A reaction where two elements switch places in a compound

• A reaction where simple materials combine to make something more complex

• A reaction where a compound containing carbon and hydrogen combines with oxygen

Answer explanation

A decomposition reaction, as the question implies, involves a complex compound breaking down into simpler ones. This is exactly what the correct choice describes - a compound getting broken down into simpler compounds. The other options involve different types of reactions, not decomposition.

What is a single displacement reaction?

• A reaction where a compound is broken down into simpler compounds

• A reaction where two elements switch places in a compound

• A reaction where simple materials combine to make something more complex

• A reaction where a compound containing carbon and hydrogen combines with oxygen

Answer explanation

A single displacement reaction, as per the question, is a type of reaction where two elements switch places in a compound. This essentially involves one element being replaced by another in a compound, thus aligning with the correct answer provided.

What is a double displacement reaction?

• A reaction where a compound is broken down into simpler compounds

• A reaction where two elements switch places in a compound

• A reaction where simple materials combine to make something more complex

• A reaction where a compound containing carbon and hydrogen combines with oxygen

Answer explanation

A double displacement reaction, as referred to in the question, is a type of chemical reaction where two elements in different compounds swap places, thereby forming two new compounds. This matches the second option, which correctly states 'A reaction where two elements switch places in a compound'.

In a synthesis reaction, what is formed?

• Simpler compounds

• Elements

• More complex compounds

• Carbon dioxide and water

Answer explanation

A synthesis reaction, as the name implies, is a type of reaction where two or more simple substances combine to form a more complex substance. Hence, the correct answer is 'More complex compounds'. The other options do not correctly describe the product of a synthesis reaction.

In a decomposition reaction, what is broken down?

• Simpler compounds

• Elements

• More complex compounds

• Carbon dioxide and water

Answer explanation

In a decomposition reaction, more complex compounds are broken down, not simpler ones. The term 'decomposition' means to 'break down'. Therefore, the reaction involves the breakdown of more complex compounds into simpler compounds or elements. So, the answer '

Simpler compounds

' is incorrect. The correct answer should be '

More complex compounds

'.

In a single replacement reaction, what happens?

• Simpler compounds are formed

• Elements switch places in a compound

• More complex compounds are formed

• Carbon dioxide and water are produced

Answer explanation

In a single replacement reaction, an element in a compound is replaced by another element. Therefore, the correct answer is that elements switch places in a compound. This process does not necessarily lead to the formation of simpler or more complex compounds, nor does it always produce carbon dioxide and water.

In a double replacement reaction, what happens?

• Simpler compounds are formed

• Elements switch places in a compound

• More complex compounds are formed

• Carbon dioxide and water are produced

Answer explanation

In a double replacement reaction, two compounds react, and the positive ions and the negative ions switch places, forming two new compounds. Hence, the correct answer is 'Elements switch places in a compound'. Other options are not a typical result of a double replacement reaction.

What type of chemical reaction is this one?
CuO + CO₂ --> CuCO₃

• Decomposition

• Combustion

• Synthesis

• Single Replacement 

Answer explanation

The given question involves a chemical reaction where Copper Oxide (CuO) and Carbon Dioxide (CO2) react to form Copper Carbonate (CuCO3). This type of reaction is known as Synthesis or Combination reaction, where two or more simple substances combine to form a more complex substance. Hence, the correct answer is 'Synthesis'.

What type of chemical reaction is this one?
Al(OH)₃ --> Al₂O₃  + H₂O

• Decomposition

• Double displacement

• Synthesis

• Single Displacement

Answer explanation

The given question involves the breakdown of Al(OH)3 into Al2O3 and H2O. This process is known as decomposition, which is a type of chemical reaction where a single compound breaks down into two or more elements or new compounds. Hence, the correct answer is 'Decomposition'.