States & Changes of Matter
What state of matter has a definite shape and volume?
A Solid
How many atoms are in one molecule of H₂O?
3
What is a Family?
a group of elements within a vertical column that share similar chemical properties
The metric prefix "centi" means __________.
One hundredth or 1/100
What is the smallest unit of matter?
An Atom
What is it called when a solid changes into a gas?
Sublimation
In the formula 2CO₂, how many oxygen atoms are there?
4
What are the vertical columns on the periodic table called?
Groups or Families
What is the acronym used to remember Metric System conversions?
King Henry Died Unexpectedly Drinking Chocolate Milk
What charge does an electron have?
A negative charge
What process turns a liquid into a gas?
Evaporation & Boiling
What must be equal on both sides of a chemical equation?
The number of atoms of the elements
Which element has the symbol Au?
Gold
Which is larger: 5,000 millimeters or 4 meters?
5,000 mm is larger
Is rusting iron a physical or chemical change?
A Chemical Change.
What is condensation?
The process when a gas changes to a liquid.
Balance this equation: __H₂ + __O₂ → __H₂O
2H₂ + O₂ → 2H₂O
The atomic mass of an element is the total number of __________ and __________.
Protons and neutrons
Arrange the following metric prefixes from largest to smallest: kilo, centi, milli, deka, hecto, deci, unit.
kilo, hecto, deka, unit, deci, centi, milli
Why is the metric system preferred in science?
Because it's decimal-based, easy to convert, and standardized worldwide.
Name two signs of a chemical change.
Color change, gas production, temperature change, or formation of a precipitate.
Balance the chemical equation: C₃H₈ + O₂ → CO₂ + H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Why do elements in the same group have similar chemical properties?
Because they have the same number of valence electrons, which determines how they react chemically.
Convert 3.5 kilometers to meters.
3,500 meters
How do you find the amount of neutrons in an element?
By subtracting the atomic number from the atomic mass.