Match these items: a) salt / 1) a fire started without any b)sun / 2) most dangerous radiation c)plasma phase / 3) rusting d)reactants / 4) product of acid plus base e)endothermic / 5)substances united in a reaction f)hard water / 6) a reaction which takes in energy g)gamma rays / 7)contains mineral salts h)slow oxidation / 8) nuclei and free electrons i)spontaneous combustion / 9)fueled by fusion

The following is the correct list of matching:

1. A fire started without any help - Spontaneous combustion.

2. Most dangerous radiation - gamma rays.

3. Rusting - slow oxidation.

4. Product of acid and base - Salt.

5. Substances united in a reaction - reactants.

6. A reaction which takes in energy - Endothermic

7. Contains mineral salts - Hard water.

8. Nuclei and free electrons - Plasma phase.

9. Fueled by fusion - Sun.

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

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