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Questions in chemistry

[Done] What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11?

[Done] Three chemistry students measured the length of a copper bar. The recorded lengths were 5.05 cm, 5 cm, and 5.1 cm. What is the average length of the bar? Show your work.

[Done] What is the molecular formula for CHON with a molar mass between 165 and 170?

[Done] What does pasteurization mean?

[Done] Briefly discuss three physical properties of ionic solids that are linked to ionic bonds.

[Done] Give an example of an oxidation reaction that can be a nuisance.

[Done] **Which of these is a demonstration of a chemical change?** A. Ice melting into water B. Wood becomes charred and black from burning C. Water evaporates from a sugar solution, leaving behind sugar crystals D. A balloon suddenly popping **Please explain the answer.**

[Done] What's an example sentence using "pure substance"?

[Done] Which list describes the properties of a liquid? A. Fixed volume, definite shape B. Fixed volume, takes the shape of its container C. Completely fills its container, definite shape D. Completely fills its container, takes the shape of its container

[Done] At STP, what physical property of aluminum always remains the same from sample to sample?