Q4: Review 2022-2023

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue. The substance in the beaker ______

• Is a base.

• has a neutral pH.

• is an acid.

• doesn't have a pH.

Which of the following word pairs correctly completes the sentence below? ______ are corrosive substances characterized as having a strong smell, a sour taste, and a ____.

• Bases

  pH less than 7

• Bases

  pH greater than 7

• Acids

  pH less than 7

• Acids

  pH greater than 7

Stronger acids are those that ______

• hold onto their protons more strongly.

• lose their protons easily.

• more completely inhibit polarity in water.

• exhibit hydrogen bonding.

When an equal strength acid and base are mixed, what kind of chemical reaction occurs?

• Oxidation

• Decomposition

• Combustion

• Neutralization

Drag the correct answer to the boxes to make the statement true.

The conjugate pair for a strong acid is a ​ ​ (a)   ​ (b)  

• weak
• base
• strong
• acid

Drag the correct answer to the boxes to make the statement true.

The conjugate pair for a weak acid is a ​ (a)   ​ (b)  

• strong
• base
• weak
• acid

Potassium hydroxide, also known as lye, dissociates into metal and hydroxide ions in water. The resulting solution is caustic and used for industrial purposes.

What describes the dissociation solution?

• Strong Base

• Weak Acid

• Weak Base

• Strong Acid

The table shows the pH of several solutions. Which solution has the greatest concentration of H⁺ ions?

• Bleach

• Milk

• Vinegar

• Water

Tags

NGSS.MS-PS1-2

The table shows the pH of several solutions. Which solution has the greatest concentration of OH^- ions?

• Water

• Milk

• Vinegar

• Bleach

Tags

NGSS.MS-PS1-2

The base Ba(OH)₂ neutralizes the acid H₂SO₄. Which salt is produced?

• BaH₂

• BaSO₄

• BaH₂S

• BaO₄