Exploring Energy and Chemical Changes

Which of the following is an indicator of a chemical change?

• Melting of ice

• Production of a gas

• Dissolving sugar in water

• Breaking a glass

Tags

TEKS.SCI.6.6E

A block of wood floats on water but sinks in oil. What can be inferred about the density of the wood?

• The wood is denser than water but less dense than oil.

• The wood is less dense than both water and oil.

• The wood is denser than both water and oil.

• The wood is less dense than water but denser than oil.

Tags

TEKS.SCI.6.6D

Which of the following scenarios best illustrates a chemical change?

• Boiling water

• Rusting of iron

• Cutting paper

• Freezing juice

Tags

TEKS.SCI.6.6E

If a substance has a density of 0.8 g/cm³, will it float or sink in water? Explain your reasoning.

Tags

TEKS.SCI.6.6D

Describe how energy is transferred in a food web.

Tags

TEKS.SCI.6.8B

Which of the following is an example of energy transformation in an electrical circuit?

• Chemical energy to thermal energy

• Electrical energy to light energy

• Mechanical energy to sound energy

• Thermal energy to chemical energy

Tags

TEKS.SCI.6.8B

Explain how energy is transferred through a transverse wave.

Tags

TEKS.SCI.6.8C

Which of the following changes indicates the formation of a new substance?

• Evaporation of water

• Change in color

• Melting of wax

• Dissolving salt in water

Tags

TEKS.SCI.6.6E

Which of the following best describes a longitudinal wave?

• Particles move in circular paths.

• Particles move parallel to the direction of wave propagation.

• Particles move perpendicular to the direction of wave propagation.

• Particles do not move at all.

Tags

TEKS.SCI.6.8C

Which of the following is a sign of a chemical change?

• Change in shape

• Change in temperature

• Change in size

• Change in state

Tags

TEKS.SCI.6.6E