Materials with ionic or covalent bonds tend to be more easily scratched?

Ionic

Explanation:

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In this case, ionic bonds are more likely to be scratched since the molecules are more strongly bonded than those covalently bonded, due to the fact that as a result of that force, their structure will have a harder and more compact surface and inner assembly than those covalently bonded; consequently, it will be easier to scratch them.

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water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.