Chemical reaction

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

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

• combustion

• synthesis

• decomposition

• single replacement

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

• combustion

• synthesis

• decomposition

• single replacement

How can you balance a chemical equation?

• by changing subscripts

• by changing coefficients

• by changing reactants

• by changing products

How many atoms of each type are in (NH₄)₂SO₄?

• N = 1, H= 4, S= 4 ,O= 4

• N=2, H = 4, S = 2, O = 8

• N = 2, H= 8, S= 4, O= 4

• N = 2, H= 8, S= 1, O= 4

What indicates that a chemical reaction has occurred?

• Indicators of a chemical reaction include color change, temperature change, gas production, precipitate formation, and odor change.

• Formation of a solid without a reaction

• No change in color

• Increase in mass

What is produced in a chemical reaction?

• Reagents

• Products

• Solvents

• Catalysts

Why is balancing chemical equations important?

• It ensures the conservation of mass and accurate representation of chemical reactions.

• It is necessary for cooking recipes.

• It helps in predicting the weather.

• It allows for faster chemical reactions.