Question

which of the following happens during a chemical change? check all of the boxes that apply. one atom or more changes into atoms of another element. new substances with different properties are formed. solids, liquids, or gases may form. reaction mixtures always give off some heat. reaction mixtures always need to be heated. done

Explanation:

• "One atom or more changes into atoms of another element": Chemical changes don't involve transmutation of elements (that's nuclear change), so this is incorrect.
• "New substances with different properties are formed": This is a key characteristic of a chemical change, as chemical reactions produce new compounds/molecules with distinct properties.
• "Solids, liquids, or gases may form": Chemical changes can result in the formation of substances in different states (e.g., precipitation of a solid, gas evolution), so this applies.
• "Reaction mixtures always give off some heat": Some reactions absorb heat (endothermic), so "always" is wrong.
• "Reaction mixtures always need to be heated": Many reactions occur at room temperature (e.g., acid - base reactions), so "always" is incorrect.

Answer:

• New substances with different properties are formed.
• Solids, liquids, or gases may form.