monday 06/6

What range of values on the pH scale represent solutions with a higher ratio of hydronium (H₃O⁺) ions?

• 0-14

• below 7

• 7

• above 7

When found in food, acids often taste ________.

• Sour

• Bitter

• Salty

• Slippery

When found in food, bases often taste _______.

• Sour

• Bitter

• Salty

• Soggy

Four solutions are tested and found to have the following pH values. Which of these substances would be considered the weakest acid?

• Lemon Juice - pH=2

• Apple Juice - pH=4.5

• Shower Cleaner - pH=5.5

• Hydrogen Peroxide - pH=7

According to the pH range which substance is more acidic than lemon juice

• Hydrochloric acid
• cabbage
• milk

what happens when a solution of  an acid is mixed with a solution of a base in a test tube?a

• temperature of the solution increases 
• temperature of the solution decreases
• temperature remains constant
• no reaction

a sample of soil is mixed with water and allow to settle . The soln turns yellowish orange which of the foll soln will turn the colour to greenish blue 

• lemon juice
• vinegar
• common salt
• antacid

calcium phosphate is present in tooth enamel its nature is

• basic
• acidic 
• neutral
• amphoteric

an aqueous soln turns red lithmus blue . excess addition of which of the following would reverse the change

• baking powder
• lime
• ammonium hydroxide solution
• HCL

If a few drops of concentrated acid accidentally spills over the hand of a student,what should be done

• wash the hand with saline solution
• wash the hand immediately with plenty of water and apply a soln of sodium hydrogen carbonate
• after washing apply soln of sodium hydroxide
• neutralise the acid wih a strong alkali