Cumulative Exam — Cumulative exam Answers

Which is the balanced equation for S8 + O2 → SO2?

Which is an example of a chemical change?

The symbol P represents the element phosphorus. This element’s atomic number is 15. How many protons and electrons are in a P–3 ion?

Which statement best explains how the mass of an atom is organized?

The chemical formula for cesium oxide is Cs2O. What is the charge of cesium?

Chang makes the diagram below to compare Gay-Lussac’s law and Charles’s law.

Which element is a halogen?

Alai is comparing the physical property of two materials. He is hitting each with a hammer to observe what happens. What physical property of the materials is Alai most likely observing?

Sodium hydroxide (NaOH) was added to pure water (H2O). Which most likely were the pH values of the water before and after the sodium hydroxide was added to it?

Covalent bonds tend to make atoms more stable by helping them