Which of the following is an example of a chemical change? (Select all that apply). Baking soda and vinegar combine and bubbles (a gas) are produced.

A cake is cut into 8 equal pieces.

A paper clip is bent into a new shape.

Water evaporates from a pot of boiling water.

Two liquids combine to form a solid substance.
A match burns.

Baking soda and vinegar combine and bubbles (a gas) are produced

Two liquids combine to form a solid substance

A match burns

Explanation:

Baking soda and vinegar combine and bubbles (a gas) are produced.

Water evaporates from a pot of boiling water.

A match burns.

Two liquids combine to form a solid substance.

Explanation:

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms