Question

match each vocabulary word with its meaning.

1. ______ element with 4 valence electrons that can covalently bond to many other elements. a. cohesion
2. ______ attraction between molecules of the same substance. b. nucleic acid
3. ______ a macromolecule that contains phosphorus. c. catalyst
4. ______ increases speed of chemical reactions without itself changing. d. carbon

review key questions

Explanation:

Question 3

Carbon has 4 valence electrons and can form covalent bonds with many elements. So the vocabulary word for "Element with 4 valence electrons that can covalently bond to many other elements" is carbon.

Cohesion is defined as the attraction between molecules of the same substance. So the vocabulary word for "Attraction between molecules of the same substance" is cohesion.

Nucleic acids are macromolecules that contain phosphorus (in their phosphate groups). So the vocabulary word for "A macromolecule that contains phosphorus" is nucleic acid.

Answer:

d. carbon

Question 4