|Sugar dissolving and ice melting are ____ changes.
|When water (a liquid) boils, it ____ into steam (a gas).
|Solid nonmetals are brittle, whereas metals are ____.
|Salts and sugars dissolve in water and thus are water ____.
|All atoms of an element have the ____ number of protons.
|Blood, muddy water, soil, and granite are ____ mixtures.
|A ____ cylinder is better than a beaker for measuring volumes.
|All heterogeneous mixtures can be ____ by physical means.