Chemical Reactions and Equations

Front

What is a reactant in a chemical reaction?

Back

A material used to make something

Answer explanation

A reactant is a material used to make something in a chemical reaction. It is the starting substance that undergoes change, while products are formed from the reaction. Thus, the correct choice is 'A material used to make something'.

Tags

NGSS.MS-PS1-1

Front

Fill in the blank: A product is what's made from the ______.

Back

reactants

Answer explanation

A product is formed from reactants in a chemical reaction. Therefore, the correct choice is A) reactants, as they are the starting materials that undergo transformation to create the product.

Tags

NGSS.MS-PS1-5

Front

Which of the following represents a synthesis reaction? Options: A) A + B -> AB, B) AB -> A + B, C) A + BC -> AB + C, D) AB + CD -> AC + BD

Back

A + B -> AB

Answer explanation

A synthesis reaction occurs when two or more reactants combine to form a single product. In option A, A and B combine to form AB, which is the correct representation of a synthesis reaction.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

What does the arrow in a chemical equation indicate?

Back

The direction that products are made in

Answer explanation

The arrow in a chemical equation indicates the direction that products are made in, showing the transformation from reactants to products. It does not represent the type of reaction, temperature, or color.

Front

In a decomposition reaction, a compound ______ into simpler substances.

Back

breaks down

Answer explanation

In a decomposition reaction, a compound breaks down into simpler substances. This means it is separated into its individual components, making 'breaks down' the correct choice.

Tags

NGSS.MS-PS1-1

Front

Which of the following is an example of a combustion reaction?

• AB + O2 -(heat)> AO + BO
• A + B -> AB
• AB -> A + B
• A + BC -> AB + C

Back

AB + O2 -(heat)> AO + BO

Answer explanation

The correct choice, AB + O2 -(heat)> AO + BO, represents a combustion reaction where a substance (AB) reacts with oxygen (O2) to produce new products (AO and BO) and releases heat, characteristic of combustion.

Front

In a single replacement reaction, one element ______ another in a compound.

Back

replaces

Answer explanation

In a single replacement reaction, one element replaces another in a compound. This means that the correct choice is 'replaces', as it accurately describes the process of substitution in the reaction.

Tags

NGSS.MS-PS1-1

Front

What type of reaction is represented by AB + CD -> AC + BD?

Back

Double replacement

Answer explanation

The reaction AB + CD -> AC + BD involves the exchange of components between two compounds, which is characteristic of a double replacement reaction. In this case, A and C switch places with B and D.

Front

In a synthesis reaction, two or more substances ______ to form a new compound.

Back

combine

Answer explanation

In a synthesis reaction, two or more substances combine to form a new compound. The other options, such as break down, replace, or heat, do not accurately describe the process of forming a new compound.

Front

Identify the product in the reaction H2 + O -> H2O.

Back

H2O

Answer explanation

In the reaction H2 + O -> H2O, hydrogen (H2) and oxygen (O) combine to form water (H2O). Therefore, H2O is the product of the reaction, making it the correct answer.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2