pH: Physical and Chemical change

Which of the following are TWO properties of an acid?

• tastes sour and feels slippery

• tastes bitter and feels slippery

• tastes sour and turns red litmus paper blue

• tastes sour and turns blue litmus paper red

Which of the following is a base?

• Vinegar

• Lemon Juice

• Orange Juice

• soap

Which indicator turns bright pink when it comes in contact with a base?

• red litmus paper

• blue litmus paper

• phenolphthalein

• salt

What is pH of a neutral solution?

• 4

• 3

• 7

• 14

Which of the following is a chemical change?

• Water evaporating

• Carbon and oxygen forming Co2

• Glass Breaking

• Ice cream melting

What happens during a physical change?

• New substances are formed

• The identity of the substance changes

• A chemical reaction occurs

• A substance may look different, but its identity does not change

Which of these is a physical change?

• Paper burning

• water

• an orange being cut

• iron rusting

Which of these is always evidence of a chemical change

• Formation of bubbles

• temperature change

• change in color

• Formation of precipitate