Chemical Reactions

Multiple Choice

Which pH value indicates the most basic solution?

• 7

• 8

• 3

• 11

Multiple Choice

If a solution is acidic, it can be neutralized by adding

• a stronger acid

• heat

• a base

• a weaker acid

Multiple Choice

When the pH of a solution becomes more basic, the number on the pH scale

• decreases

• increases

• stays the same

• triples

Multiple Choice

When an acid and a base are mixed, what is the reaction called?

• Neutralization

• Hydrolyzed

• Hydro Ionization

• A salt and a water reaction

Multiple Choice

What base has a pH of 8.5?

• Blood

• Soap

• Baking Soda

• Drain Cleaner

Multiple Choice

Lemons would be classified as a

• Strong base

• Weak Base

• Strong Acid

• Weak Acid

Multiple Choice

In a water solution, how do acids differ from bases?

• Acids form salts, but bases do not

• Acids turn litmus blue, while bases turn litmus red

• Acids form hydrogen ions (H+), while bases form hydroxide ions (OH-)

• Bases form salts, but acids do not

Multiple Choice

What is a chemical reaction?

• a change in matter when the molecules rearrange to make new molecules

• a change in matter when matter changes its form or appearance

• a change in matter when the physical appearance changes

• a very boring change in matter

Multiple Choice

The reactants in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

Multiple Choice

The products in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

Multiple Choice

When energy like heat and light are given off in a chemical reaction it is called

• exothermic

• endothermic

• eccentric

• ectomorphic

Multiple Choice

When energy is absorbed and taken in during a chemical reaction it is called

• exothermic

• endothermic

• eccentric

• ectomorphic

Multiple Choice

How is a chemical change different from a physical change?

• there is no difference

• a physical change creates a new substance

• a chemical change creates a new substance

Multiple Choice

What is the number “4” in SiCl₄?

• a subscript

• a coefficient

• a product

• a reactant

Multiple Choice

The expression CaCO₃ → CaO + CO₂ is an example of a

• reactant.

• product.

• chemical equation.

• chemical progression.

Multiple Choice

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

Multiple Choice

In a chemical reaction, everything to the right of the arrow is called ______________.

• Products
• Yields
• Molecules
• Reactants

Multiple Choice

What does the number ₃ represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

Multiple Choice

What does the number 4 represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

Multiple Choice

How many Nitrogen (N) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

Multiple Choice

How many Hydrogen (H) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

Multiple Choice

How many total molecules is 4NH₃?

• 4

• 1

• 3

• 12

Multiple Choice

How many total atoms make up 4NH₃?

• 4

• 16

• 3

• 12

Multiple Choice

In the equation shown, what are the reactant(s)?

• N₂ + H₂

• NH₃

Multiple Choice

In the equation shown, what are the product(s)?

• N₂ + H₂

• NH₃

Multiple Choice

Which of the following is a chemical reaction?

• Sodium and chlorine atoms bond to form salt molecules.

• Ice melts to form water.

• Carbon dioxide freezes to form dry ice.

• Salt and water mix to form salt water.

Complete ALL the discussion questions on ws#11: Fizz, flame and pH