CHEMICAL REACTIONS

The number placed below an element’s symbol in a chemical formula is called a

• subscript

• coefficient

• reactant

• product

The substances listed on the left side of a chemical equation are the

• products

• coefficients

• precipitate

• reactants

Which two processes could be considered opposites?

• decomposition and double replacement

• double replacement and substitution

• substitution and synthesis

• synthesis and decomposition

In a chemical reaction, a hydrocarbon compound reacts with the diatomic element oxygen. What type of reaction is this?

• single replacement

• combustion

• combination

• double replacement

It is a type of reaction in which two or more simple substances combine to form a more complex substance.

• combination reaction

• decomposition reaction

• single replacement reaction

• double replacement reaction

Tags

NGSS.MS-PS1-5

What evidence would tell that a chemical reaction has taken place?

• release of light and heat

• formation of gas

• formation of precipitate

• all of these

Tags

NGSS.MS-PS1-2

In this reaction, a more active element replaces active element in the compound.

• combination reaction

• decomposition reaction

• single replacement reaction

• double replacement reaction

Is the following reaction a synthesis, decomposition, single replacement or combustion reaction? C₁₀H₈ + O₂ → CO₂ + H₂O

• combustion

• synthesis

• decomposition

• single replacement

What would the reverse of decomposition reaction be called?

• analysis reaction

• double replacement Reaction

• single replacement reaction

• synthesis reaction

What type of reaction is FeS + HCl → FeCl₂ + H₂S

• synthesis

• decomposition

• single replacement

• double replacement