A student made observations about four different solid materials and recorded the observations on the table below.

One or more of these materials is metal. Based on the observations, which of these materials are likely to be metal? (hint: does color tell us it's a metal? Does dissolving in water tell us it's a metal? or does it being a conductor tell us it's a metal?)

• material b and c

• material a and c

• material a and d

• material b and d

Which of these objects will MOST likely float in water?

• table tennis ball

• glass marble

• hard rubber ball

• steel ball

Which best explains why a plastic container is poorly suited for boiling water on top of the stove?

• plastic comes in many different colors

• plastic melts when it gets exposed to high heat

• plastic does not conduct heat

• plastic does not conduct electricity

A student bends a piece of wire.

Which of these BEST describes why bending the wire is an example of a physical change?

• because the bent wire is a new material

• because the bent wire will break

• because the bent wire is more useful

• because the bent wire can be straightened back

Which test should be used to determine the best material for

constructing a bookshelf?

• strength

• flexibility

• conductors of heat

Four objects are on a wooden ramp. Which object is MOST likely to roll off the ramp if it is pushed gently?

• bent paper clip

• flat eraser

• round ball

• wooden cube

Which object will conduct electricity, conduct heat, and be attracted to a magnet?

• wood

• iron

• aluminum

• cotton

A scientist is designing a special fabric to use in making suits for firefighters. Which characteristic should the fabric have to increase safety?

• the fabric should conduct heat

• the fabric should be able to be dyed

• the fabric should be soft

• the fabric should not react to heat or flames

Shantal compared some of the properties of a marble to a piece of wood. She placed a marble and a piece of wood in a bucket filled with water. Shantal observed the wood floating on top of the water, but the marble sank to the bottom of the bucket. Which statement BEST explains why the marble and piece of wood acted differently in the water?

• the piece of wood was bigger than the marble

• the marble was more dense that the piece of wood

• the piece of wood was more dense than the marble

• the marble was bigger than the piece of wood

check the boxes to all the metals

• nail

• eraser

• ball

• penny

• safety pin