Chemistry, 29.06.2019 15:30 kiingbr335yoqzaxs

The changing of substances to other substances by the breaking of bonds in reactants and the formation of bonds in products.

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Answer from: Lewis5442

Definition of chemical change or reaction.

Explanation:

The changing of substances to other substances by the breaking of bonds in reactants and the formation of bonds in products is the definition of chemical change or reaction.

Chemical reactions or cahnges are the transformation of pure substances, compounds or elements, into other substances by the breaking of some bonds adn the formation of other bonds.

The chemical reactions are represented by chemical equations with the reactants in the left side and the products in the right side, connected by the use of arrows.

For example, the chemical equation CH₄ (g) + O₂(g) → CO₂(g) + H₂O(g) represents the combustion reaction (chemical change) of methane (CH₄) with oxygen (O₂).

The products of the reaction are carbon dioxide (CO₂) and water (H₂O) which are the new substances formed by breaking the chemical bonds in CH₄ and O₂ and the formation of the bonds in the new molecules (CO₂ and H₂O).

Chemical equation: CH₄ (g) + O₂(g) → CO₂(g) + H₂O(g)

↑ ↑ ↑ ↑

-- reactants -- --- products --

The bonds in CH₄ and O₂ are brokenThe bonds in CO₂ H₂O are formed

The reactants have been transformed into different chemical compounds, so this is a chemical changle.

Answer from: Quest

- 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

Answer from: Quest

ill try to . no promises tho.

explanation:

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