Scientific Basics
Anything that has mass and takes up space
What is matter?
Characteristics that can be observed without changing a substance’s identity
What are physical properties?
Standard quantities used to express measurements (ex: grams, meters)
What are units?
The center of the atom where protons and neutrons are located
What is the nucleus?
A physical combination of two or more substances that can be separated physically
What are mixtures?
The study of matter, its properties, how it changes, and the energy involved
What is chemistry?
Characteristics that describe a substance’s ability to undergo chemical change
What are chemical properties?
A way to express very large or small numbers using powers of ten
What is scientific notation?
The subatomic particle with a negative charge found in the electron cloud
What is an electron?
The process of examining data or substances to understand composition, structure, or behavior
What is analysis?
A measure of the amount of matter in an object
What is mass?
The ratio of mass to volume for a substance
What is density?
The digits in a number that include all known digits plus one estimated digit
What are significant figures?
The number of protons in an atom that identifies the element
What is the atomic number?
The study of how substances interact and transform into new substances
What are chemical reactions?
The amount of space an object or substance occupies
What is volume?
Interactions that form new substances with different compositions and properties
What are chemical reactions?
A mathematical method for converting between units using conversion factors
What is dimensional analysis?
Atoms that have the same number of protons but different numbers of neutrons
What are isotopes?
The process of obtaining quantitative data about physical properties using standard units and tools
What are measurements?
The process of examining data, results, or substances to understand their composition, structure, or behavior
What is analysis?
A material with a uniform and definite composition consisting of only one type of element or compound
What are pure substances?
The degree of doubt in a measurement due to limitations or errors
What is uncertainty?
The total number of protons and neutrons in the nucleus of an atom
What is the mass number?
This number changes when an atom gains or loses electrons to form an ion, but the mass number stays the same
What is the number of electrons?