1. Chemistry is the study of the composition, structure and properties of substances.- F?
21. Which is found in the nucleus-- Protons or neutrons?
27. Copper metal is:
a. poor conductors
b. brittle
c. malleable
C?
44. What is the charge on most polyatomic ions? - Negative
Thanks
-MC
21. both are found in the nucleus.
1. Look at your text on the definition of chem. I always included reactions and changes.
1. Chemistry is indeed the study of the composition, structure, and properties of substances. So the statement is true.
21. To determine whether protons or neutrons are found in the nucleus, we need to recall the basic structure of an atom. The nucleus is the central part of an atom and contains protons and neutrons. Protons have a positive charge, while neutrons have no charge. Therefore, the correct answer is: both protons and neutrons are found in the nucleus.
27. Copper metal has several properties. Among them, it is known to be a good conductor of electricity and heat. So, it is not a poor conductor. Copper is also not brittle, as it has high ductility. The correct answer is that copper metal is malleable, meaning it can be easily hammered or rolled into thin sheets.
44. Polyatomic ions are charged species made up of multiple atoms. Most polyatomic ions have a negative charge. This is because they tend to gain electrons to achieve a stable electron configuration. Therefore, the charge on most polyatomic ions is negative.