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Chemistry LibreTexts

What happened here?

  • Page ID
    185555
  • Matter can be changed physically or chemically. Identifying these changes is important to the study of weathering and erosion. 

     

    icg_physchemchangeposter_57530747ddaa0.jpg

    Used with permission from tes.com

    In each example below, guess whether the change was physical (mechanical) or chemical. 

    Qobustan-salt_575302ef4d267.jpg

    1

    Weathering_freeze_thaw_action_iceland_5753055b6bf9b.jpg

    2

    E0F68E6C-155D-9421-1FDAF3A7159D2AEC_575303a019905.jpg

    3

    Ice_wedge_iceland_575305c66581b.jpg

    4

    download_5753043f1ab76.jpg

    5

    Skulptur_aus_Sandstein_Dresden_2012-09-06-0555_575306438a50e.jpg

    6

     

    Check your answers:

    1 - chemical - Weathering of sandstone caused by salt. 

    2 - physical - Due to temperature changes. This kind of weathering is called Thermal Stress. 

    3 - chemical - A rusted fire hydrant. Rust is caused by oxidation.

    4 - physical - Cracked rock due to ice wedging. Water freezes and forces the rock to break. 

    5 - chemical - Lichen on rock. 

    6 - chemical - due to acid rain.