States of Matter
Can you name three types of plasma?
Lightning, neon light, and stars are all made of plasma
False or True
Breaking a cookie in half is an example of Chemical Change?
False
Pure water has a pH of 7. Pure water _______.
is a neutral substance
Elements with similar chemical properties are usually found in the same _______ of the periodic table.
group or family
What are the valence electrons?
Valence of electrons is the electrons in the outermost shell of an atom that determine its chemical properties.
What form of matter have a definite shape?
Solid
Substance made up of two or more materials physically combined
Mixture
H2O, or water, contains one _____________.
oxygen atom
A chart that provides information about all of the elements that are known to exist.
Periodic table of elements
What happened if the higher the electrons shielding?
More higher the ionization energy
When occur plasma?
Plasma occur at very high temperatures, typically in stars.
What is physical change?
Physical change are change that does not create a new substance or change chemical composition.
When the red litmus paper will turn blue if the substance is a ______.
Bases
Elements along the stairstep in the periodic table that have properties of both metals and nonmetals.
Metalloids
Who come up with the second theory of the atom?
John dalton crate the second theory of atom
The phase change that takes place when a solid changes into a liquid
Melting
The head of a match is rubbed against a rough surface and catches fire.
chemical Change
Citric acid has a pH between 1 and 3. It is considered to be a?
strong acid
Elements to the left of the stairstep in the periodic table except hydrogen
Metals
What is the ionization energy?
The energy required to remove an electron from a neutral atom in its gaseous phase
Identify the scientific law stating that matter cannot be created or destroyed during ordinary physical or chemical changes.
law of conservation of mass
Physical changes include change of states, change in ___, Color and Shape
Size
what is the solution of acids and bases?
A physical properties is a characteristic of matter that can be observed or measured without changing the identify of the matter.
The majority of the elements on the periodic table are _______.
Metals
What is the distance between the atom nucleus and the outer shell or the halfway point between point between bonded atoms nuclear?
Atomic radios