Lucas placed a solid ice cube and a solid metal spoon side by side on a warm plate at 40°C. After two minutes, the ice cube had started to melt into liquid water, but the metal spoon was still solid and unchanged. Which statement BEST explains why the ice cube melted but the metal spoon did not?
FREE QUIZ · PRIMARY 4 SCIENCE
Matter
Five MCQs on Matter. Pick an answer, see the specific misconception. The diagnosis comes after the score.
Hui Min inverted a plastic cup with a small hole at the bottom into a basin of water. She observed that some water entered the cup. Why did this happen?
Amir spilled the same volume of water on two different surfaces: Surface X was a wide, flat tray (large surface area) and Surface Y was a deep, narrow cup (small surface area). Both surfaces were in the same room at the same temperature with no wind. After the same amount of time, the water on Surface X had almost completely evaporated, but the water in Surface Y was mostly still there. Which statement BEST explains this observation?
Which statement correctly describes a difference between boiling and evaporation?
The table below shows the melting point and boiling point of four substances.
Substance P: melting point −39°C, boiling point 357°C
Substance Q: melting point 660°C, boiling point 2519°C
Substance R: melting point 98°C, boiling point 883°C
Substance S: melting point 0°C, boiling point 100°C
A scientist heats all four substances to exactly 50°C. Which substance would be in the LIQUID state at 50°C?
Substance P: melting point −39°C, boiling point 357°C
Substance Q: melting point 660°C, boiling point 2519°C
Substance R: melting point 98°C, boiling point 883°C
Substance S: melting point 0°C, boiling point 100°C
A scientist heats all four substances to exactly 50°C. Which substance would be in the LIQUID state at 50°C?