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1) Which term describes the conversion of substances into different substances?(1 point)

chemical reaction

fossilization

ionic bonding

photosynthesis

2)Where is energy stored during photosynthesis?(1 point)

starch

valence electrons

chemical bonds

oxygen

3)Which characteristic do valence electrons indicate about reactions between atoms?(1 point)

bond number

absolute electronegativity

bond type

electronegativity difference

4)Which compound is a carbohydrate?(1 point)

HClO4

C4H12N2

Na2C2O4

C3H6O3

5)Why are iron oxides in rocks evidence for prehistoric photosynthesis?(1 point)

Iron oxides form when cyanobacteria produce oxygen via photosynthesis.

Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.

Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.

Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.

Sagot :

pstnonsonjoku

A chemical reaction occurs when substances change. Photosynthesis is the process by which plants produce food.

1) A chemical reaction is a process by which substances can be changed into other substances. Hence, in a chemical reaction, new substances are formed.

2) Photosynthesis is the process by which plants produce food using carbon dioxide and water in the process of sunlight and chlorophyll. Glucose is produced during photosynthesis and the energy produced and stored as starch.

3) Valence electrons show the kind of bond that an atom can form. Reaction between two atoms that have many valence electrons is most likely covalent. An ionic bond is formed between an atom that has few valence electrons and an atom that has many valence electrons.

4) A carbohydrate is a compound that comprises of hydrogen and oxygen in a ratio of 2:1. The compound that is a carbohydrate is C3H6O3.

5) Rocks contain iron. Iron oxides form when cyanobacteria produce oxygen via photosynthesis.

Learn more: https://brainly.com/question/1527403

claudiaengeberg

Answer:below

Explanation:

1. Chemical reaction

2. Chemical bonds

3.bond number

4. C3H6O3

5.Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere

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