State of Matter

Mr. Elias put a pot of water on a burner to heat. The water boiled and evaporated. What state is this?

• 
• 
• 
• 

Mr. Joshua put a nail in water for some days and wrote down his observation. He found out the nailed changed colour to reddish brown (rust). Can you predict whether this change is a chemical change or a physical change?

• 
• 

Which of these metals has a melting point of 1060 degrees Celsius?

• 
• 
• 
• 

Which of the following examples shows condensation?

• A sunny day with no clouds in the sky
• A dry towel left outside in the sun
• A pot of boiling water on the stove
• A glass of cold water forming droplets on the outside

Which of the following substances or materials will melt when Woelinam holds it in his hands for some time?

• plastic
• wood
• metal
• ice

Why would ice melt when Woelinam holds it in his hands for some time?

When a solid changes to gas without going through the liquid state, it is known as .............

• condensation
• solidification
• evaporation
• sublimation