Chemical Reactions Classification

What is the goal when classifying simple chemical reactions according to the content of the image?

• To determine the pH level of the reactions

• To classify reactions as single replacement, double replacement, synthesis, decomposition, or combustion

• To calculate the reaction rates

• To identify the reactants and products only

Answer explanation

The goal when classifying simple chemical reactions according to the content of the image is to classify reactions as single replacement, double replacement, synthesis, decomposition, or combustion.

What type of chemical reaction is represented by A + B → AB?

• Decomposition

• Synthesis

• Single Replacement

• Double Replacement

Answer explanation

The given chemical reaction A + B → AB represents a synthesis reaction, where two or more substances combine to form a new compound.

Which type of reaction is shown by AB → A + B?

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

Answer explanation

The given reaction AB → A + B represents a decomposition reaction, where a compound breaks down into its constituent elements.

In a single replacement reaction, if A and B are bonded and C is alone, what would be the products after the reaction?

• A + B

• AC + B

• A + C

• A + B + C

Answer explanation

In a single replacement reaction, A replaces C in the compound BC, resulting in AC + B as the products.

During a double replacement reaction, if AB and CD are the reactants, what are the products?

• A + B + C + D

• A + BD

• AD + BC

• AB + C

Answer explanation

During a double replacement reaction, the products are formed by swapping the cations and anions of the reactants, resulting in AD + BC as the correct products.

What occurs during a synthesis reaction?

• Two substances separate into more substances.

• Two substances are coming together to form one.

• One substance changes its state of matter.

• One substance decomposes into two substances.

Answer explanation

During a synthesis reaction, two substances are coming together to form one, which is the correct answer choice.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How many products are formed in a synthesis reaction?

• No products are formed.

• One product is formed.

• Two products are formed.

• Multiple products are formed.

Answer explanation

In a synthesis reaction, one product is formed, so the correct answer is: One product is formed.

What is the product of the synthesis reaction example provided in the image: 2Na (s) + Cl2 (g) → ?

• 2NaCl (g)

• Na2Cl2 (s)

• 2NaCl (s)

• Cl2Na2 (g)

Answer explanation

The correct product of the synthesis reaction 2Na (s) + Cl2 (g) is 2NaCl (s). This is formed by the combination of 2 moles of sodium and 1 mole of chlorine gas to produce 2 moles of sodium chloride.

Tags

NGSS.HS-PS1-1

What occurs during a decomposition reaction?

• Two or more substances combine to form one substance

• One substance breaks apart into two or more smaller substances

• A substance changes its state of matter without breaking apart

• A substance reacts with oxygen to produce energy

Answer explanation

During a decomposition reaction, one substance breaks apart into two or more smaller substances, which is the correct choice.

Tags

NGSS.MS-PS1-5

Which of the following is an example of a compound decomposing?

• 2Na + Cl_2 -> 2NaCl

• Na_2O + CO_2-->Na_2CO_3

• 2NaCl -> 2Na + Cl_2

• Na_2O + CO_2 -> Na_2CO_3

Answer explanation

The correct example of a binary compound decomposing is 2NaCl -> 2Na + Cl_2.