AP Chemistry

atomic number CORRECT ANSWER The same as the number of protons in the nucleus of an element; it is also the same as the number of electrons surrounding the nucleus of an element when it is neutrally charged. mass number CORRECT ANSWER The sum of an atom's neutrons and protons isotopes CORRECT ANSWER Atoms of an element with different numbers of neutrons Avogadro's number CORRECT ANSWER 6.022×10²³ particles per one mole Moles CORRECT ANSWER grams/molar mass Standard Temperatur...

Which one of the following statements concerning matter is correct? a) a gas has a fixed volume but not a rigid shape b) a liquid has a fixed volume and a rigid shape c) a liquid takes on both the volume and the shape of its container d) a solid has a fixed volume and a rigid shape e) both b and d are correct CORRECT ANSWER d All of the following statements are true EXCEPT a) of the 113 known elements, 91 occur naturally b) an element cannot be broken down into two or more pure substan...

What is matter? CORRECT ANSWER Anything that occupies space What is the scientific method? CORRECT ANSWER Observation Ask a question Form a Hypothesis Conduct Experiment Accept/Redo Hypothesis What is a scientific law? CORRECT ANSWER Mathematical description of what will happen What is a scientific theory? CORRECT ANSWER An explanation for a law Qualitative = ? Quantitative = ? Digits of uncertainty? CORRECT ANSWER Descriptive Measured One, in all cases What is the Kinetic...

AP Chemistry Practice Midterm Exam 2023 WITH Answers

atomic number - Answer The same as the number of protons in the nucleus of an element; it is also the same as the number of electrons surrounding the nucleus of an element when it is neutrally charged. mass number - Answer The sum of an atom's neutrons and protons isotopes - Answer Atoms of an element with different numbers of neutrons Avogadro's number - Answer 6.022×10²³ particles per one mole Moles - Answer grams/molar mass Standard Temperature and Pressure (STP)...

If matter is uniform throughout and cannot be separated into other substances by physical means, it is ___. CORRECT ANSWER either an element or a compound Which of the following are chemical processes? I) rusting of a nail II) freezing of water III) decomposition of water into hydrogen and oxygen gases IV) compression of oxygen gas CORRECT ANSWER I and III only ____ refers to how close a measured number is to the true value CORRECT ANSWER Accuracy Barium reacts with a polyatomic io...

What is a solution? CORRECT ANSWER A homogeneous mixture made up of two or more substances that do not chemically combine; instead, the substances mix uniformly in the solution. What is a solvent? CORRECT ANSWER The substance present in the largest quantity by volume, usually water. What is a solute? CORRECT ANSWER The substance that is dissolved in the solvent. How do you find the empirical formula of a compound? CORRECT ANSWER First, determine mol by dividing the percent comp or mass ...

Accuracy - Answer the agreement of a particular value with a true value Acid - Answer a substance that produces hydrogen ions in solution; a proton donor Acid-base indicator - Answer a substance that marks the end point of an acid-base titration by changing color Acid rain - Answer a result of air pollution by sulfur dioxide Acidic oxide - Answer a covalent oxide that dissolves in water to give an acidic solution Actinide series - Answer a group of 14 elements followin...