Conductivity and Melting Points Quiz

What is the main function of the conductivity tester described in the video?

• To determine the melting point of substances

• To check the conductivity of various substances

• To test the brightness of a light bulb

• To measure the temperature of substances

What must be true for the light bulb in the conductivity tester to light up?

• The circuit must be incomplete

• The leads must be connected by a conductive material

• The light bulb must be unplugged

• The leads must be disconnected

Which substance was tested first for conductivity in distilled water?

• KI

• Glucose

• HCl

• KCl

What is the purpose of adjusting the Bunsen burner to allow more oxygen in?

• To decrease the flame temperature

• To increase the flame temperature

• To change the color of the flame

• To extinguish the flame

What is the significance of the inner cone of the Bunsen burner flame?

• It is the coolest part of the flame

• It is the hottest part of the flame

• It is used to measure the flame's height

• It is used to extinguish the flame

Which substance did not melt even after 80 seconds of heating?

• Paraffin

• KCl

• Glucose

• Benzoic acid

What was observed when KNO3 was heated?

• It caught fire

• It turned into a gas

• It did not melt

• It melted and became liquid

What was the result of heating paraffin?

• It did not melt

• It caught fire

• It melted and became liquid

• It turned into a gas

Why was acetic acid not tested for melting?

• It is a gas at room temperature

• It is a solid at room temperature

• It is too dangerous to heat

• It is already a liquid at room temperature

Which substance is already a gas at room temperature and was not tested for melting?

• Paraffin

• HCl

• KNO3

• Benzoic acid