Science 24 - Chapters 3 + 4

How are chemical equations organized?

• the left side is reactants, and they are separated from products by an arrow

• the left side is products, and they are separated from reactants by an arrow

• the left side is reactants, and they are separated from products by an equal sign

• the left side is products, and they are separated from reactants by an equal sign

Which of the following are evidence of a chemical reaction. Choose all that apply.

• bubbles are formed

• heat is produced

• a substance melts

• a new smell is observed

If a chemical reaction occurs in a solution and the solution becomes warmer, which of the following is true?

• The reaction is exothermic and energy is a reactant.

• The reaction is exothermic and energy is a product.

• The reaction is endothermic and energy is a reactant.

• The reaction is endothermic and energy is a product.

In word equations, what do plus signs actually mean – how do they translate?

• and

• or

• positive

• not

Magnesium reacts with chlorine gas to make magnesium chloride. This is an example of a __________ reaction:

• formation

• simple Decomposition

• neutralization

• combustion

Water can be broken down into its elements through a process called hydrolysis. This is an example of a ___________ reaction:

• formation

• simple decomposition

• neutralization

• combustion

A chemical reaction that always produces energy is:

• formation

• simple decomposition

• neutralization

• combustion

The word equation that describes any neutralization reaction is

• base + salt → acid + water

• acid + water → salt + base

• acid + element → compound + water

• acid + base → salt + water

The formula for acetic acid is CH₃COOH(aq). How many of each type of atom are there in this molecule?

• 2 carbon, 2 hydrogen, and 2 oxygen

• 2 carbon, 4 hydrogen, and 2 oxygen

• 4 carbon, 2 hydrogen, and 2 oxygen

• 1 carbon, 4 hydrogen, 1 cobalt, and 1 oxygen

What is the most common way to convert fossil fuels into energy?

• neutralization reaction

• decomposition reaction

• fusion reaction

• combustion reaction