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Kelly - have you tried looking at state or national science standards ... and even more importantly the reasoning behind them? You won't find chemistry in 1st grade.
If we use the term 'chemistry' very loosely, the closest we get is states of matter - generally tangible ones like solids and liquids maybe 2nd grade depending on state, more abstract ones like gasses at 4th, and then physical properties maybe 6th grade and they just moved density out of the 6th grade to middle school. Middle school you finally start seeing some chemistry. Why? Because to _understand_ chemistry is to tie what one sees at the macroscopic level to the invisible interactions of invisible particles, specifically the behavior of invisible electrons that make up the invisible atoms. As Piaget discoverred over a century ago, abstract thought comes later than concrete thought - usually around the time of puberty. Likewise, ever since the Project 2061 standards came out back in the 1990s the shift has been towards 'chemistry' more towards middle school.
At the 1st grade level you should be focusing on concrete experiences they can directly interact with. Rocks, weather, animals, plants, rolling balls, light, etc. as per NGSS or your state standards and honing observation and basic skills of inquiry.
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