Matter & Properties
What is anything that has mass and takes up space?
Matter
What is the smallest unit of an element that keeps that element’s properties?
An atom
What information does an element’s chemical symbol represent?
The element’s name
What is a pure substance made of only one type of atom?
An element
What is a combination of substances that are not chemically joined?
A mixture
What is the term for a solid changing into a liquid?
Melting
Which subatomic particles have a positive charge?
Protons
What number on the periodic table identifies an element?
Atomic number
What is a substance made of two or more elements chemically joined?
A compound
Is trail mix a mixture or a compound?
A mixture
What property describes how much mass is packed into a certain volume?
Density
Where are protons and neutrons found in an atom?
In the nucleus
What do elements in the same column, or group, generally have in common?
They often have similar chemical properties
Is water, H2O, an element or a compound?
A compound
What kind of mixture looks uniform throughout?
A homogeneous mixture, or solution
A sample keeps its shape and volume. What state of matter is it?
Solid
What does an atom’s atomic number tell you?
The number of protons
What broad type of element is typically shiny and conducts heat and electricity well?
Metal
In a compound, are the elements physically mixed or chemically bonded?
Chemically bonded
What method could separate dissolved salt from saltwater?
Evaporation
What happens to particle motion when thermal energy is added to a substance?
Its particles move faster, on average.
A neutral atom has 8 protons. How many electrons does it have?
8 electrons
An atom has 11 protons. Which element is it?
Sodium
How many hydrogen atoms are in one molecule of H2O?
2 hydrogen atoms
Why can the parts of a mixture often be separated by physical methods?
Their substances are not chemically bonded, so their physical properties remain available for separation.