C2 The Periodic Table Flashcards
What is the definition of an atom?
An atom is the smallest part of an element that can exist
True or False: Atoms can be created or destroyed in a chemical reaction.
False
What is the relative mass of a neutron?
1 atomic mass unit (amu)
What is the periodic table?
A tabular arrangement of chemical elements organized by increasing atomic number.
What is the main difference between an element and a compound?
An element is a pure substance that cannot be broken down, while a compound is made up of two or more elements chemically bonded together.
Which particle determines the chemical behavior of an atom?
Electrons
What are isotopes?
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
Multiple choice: What type of bond is formed between sodium and chlorine in sodium chloride? A) Covalent B) Ionic C) Metallic
B) Ionic
True or False: The atomic number of an element is equal to the number of neutrons in its nucleus.
False
Fill in the blank: The law of conservation of mass states that mass is ______ in a chemical reaction.
neither created nor destroyed
What is a chemical reaction?
A process that involves the rearrangement of the molecular or ionic structure of a substance.
What is an endothermic reaction?
A reaction that absorbs energy from its surroundings, usually in the form of heat.
What is an exothermic reaction?
A reaction that releases energy to its surroundings, usually in the form of heat.
Multiple choice: Which of the following is a strong acid? A) HCl B) CH3COOH C) NaOH
A) HCl
What is the pH range of acids?
0 to 6
