Do you cover significant figures, exponential notation and dimensional analysis (conversions) at the beginning of the course, or interspersed within the curriculum, and for how long?

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Beginning and always. But teach it with meaning. Not just rules. It’s all about precision of measurement. Help them know that and it becomes easy and logical.

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Beginning of the year because it’s a thread I use all year long.

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I have found in 27 years of teaching that the students forget everything I taught because some concepts that use the skills don’t reappear in the curriculum for weeks to months after it’s taught. I end up re-teaching the skill when it’s needed so I ended up wasting a month that could have been used for other content and making student connections. It isn’t in our state curriculum or next gen standards as a separate unit. It’s embedded in the standards. My 2cents

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. That is an essential skill. It must be taught at the beginning.

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At our school we used to do it in the beginning, but have moved to doing less and less at the beginning and more throughout. I like it better throughout.

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Beginning, although the other chem teacher at my school doesn’t cover sig figs (because it’s hard for the kids) 🙄

Same at my school 😒. However the kids can learn it, they can do hard things.

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