Which statement is true about sand and baking soda? both are mixtures. both are pure substances. sand is a mixture and baking soda is a pure substance. sand is a pure substance and baking soda is a mixture.

The correct answer is Both are mixtures.

Explanation:

Sand and sodium bicarbonate are mixtures of pure substances. In the sand, we can find substances such as silica, usually in the form of quartz, ground limestone, iron, and others. Sodium bicarbonate is composed of pure substances Carbon and Sodium.

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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.