Chemistry 🧪 Flashcards
What is the atomic number of an element?
The number of protons in the nucleus of an atom of that element.
What is an isotope?
Atoms of the same element with the same number of protons but different numbers of neutrons.
What is the formula to calculate density?
Density = mass / volume
What is a covalent bond?
A chemical bond that involves the sharing of electron pairs between atoms.
What is the Law of Conservation of Mass?
Matter cannot be created or destroyed in a chemical reaction.
What is the pH scale used for?
To measure the acidity or basicity of a solution.
What is the difference between an exothermic and endothermic reaction?
Exothermic releases heat energy, while endothermic absorbs heat energy.
What is the atomic mass of an element?
The weighted average mass of the isotopes of that element.
What is the difference between a compound and a mixture?
A compound is a substance made of two or more elements chemically combined, while a mixture is a physical blend of two or more substances.
What is the chemical formula for water?
H2O
What is an ionic bond?
A chemical bond that involves the transfer of electrons between atoms.
What is the difference between a physical change and a chemical change?
A physical change does not change the substance’s chemical identity, while a chemical change does.
What is the formula for calculating pressure?
Pressure = force / area
What is a catalyst in a chemical reaction?
A substance that increases the rate of a chemical reaction without being consumed in the process.
What is the difference between a homogeneous and heterogeneous mixture?
A homogeneous mixture has uniform composition and properties throughout, while a heterogeneous mixture does not.
