Elements/Compounds/Mixtures
this is a pure substance that cannot be broken down into anything else
What is an element?
What are the vertical columns of the periodic table called?
Groups
When a liquid changes into a gas, this is called?
What is evaporation?
A phase change is always what type of change?
What is physical change?
The basic building block of all elements is an ___________.
What is an atom?
When two substances are combined without a chemical reaction and can be separated.
What is a mixture?
What are the horizontal rows of the periodic table called?
Periods
Most elements in groups 1 and 2 of the periodic table, are in what state of matter?
Solids
Chopping up firewood would be considered which type of change?
A physical change?
A substance composed of two or more elements that can be a mixture is ....
What is a compound?
Give an example of a heterogeneous mixture.
Cereal, oil and water, salad dressing, salad, rocks in sand etc. anything not completely mixed together
The atomic mass includes the total amount of __________ and _________.
Protons and nuetrons
The halogens, Group 17 on the periodic table, are typically found natrually in what state of matter?
Gas form
A change in color signifies which type of change?
Both physical and chemical.
What is the chemical formula for the compound Glucose?
C6H12O6
Give an example of a homogeneous mixture.
water, koolaid, anything that appears to be completely mixed, glue,
The atomic number shows us what information about an element?
How many protons and electrons it has.
When a gas changes its phase directly into a solid, this is called?
Sublimation
Formation of a gas would signify which type of property?
A chemical property
What is an covalent bond?
Chemical bond where electrons are shared between two compounds.
What compound would Na and Cl form? Give chemical name and acid name.
NaCl or Sodium chloride (Table salt)
Elements that are in the same group have what in common?
Physical properties (being in same state of matter)
The temperature needed for a substance or liqid to begin evaporation is called the what?
What is the boiling point?
What is a chemical reaction?
What does the Law of Conservation of Matter state?
Matter cannot be created or destroyed in a chemical reaction