In order to make observations, an observer must always use

An interpretation based on an observation is called

Which term represents a fundamental unit?

A student investigated the physical and chemical properties if an unknown gas and then identified the gas. Which statement represents a conclusion rather than an experimental observation?

Any substance that has mass and takes up space is called

In which phase of matter are the molecules of a substance farthest apart from each other?

The nucleus is the part of the atom that

Which material is a mixture?

All of the following are chemical changes, except

The elements on the Periodic Table are arranged in the horizontal rows according to each successive element's greater

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