U7 Review: The Nature of Matter

What part of an atom can never change?

The rounded atomic mass tells us the element's most common

The force that needs to be broken to change a liquid into a gas

Who wrote the first textbook on chemistry?

A property that indicates how a substance will react with another

An atom that varies in its number of neutrons is called a/an

A characteristic observed with the senses and not changing the substance

An atom that has gained or lost electrons to fill its valence shell is called

Mass is an _______________ physical property

The Law of Conservation of Mass states that the mass of the reactants must equal the mass of 

How many periods are there on the periodic table?

A Lewis diagram of Helium would have how many electrons?

Color is a 

Nitrogen has how many valence electrons?

A molecule is the smallest part of a _______________ that retains its characteristics

All group 6 elements have

Neon's atomic symbol is

Oxygen has how many electrons?

Lithium will form what kind of ion?

When was the electron discovered?

How many groups are there on the periodic table?

Who discovered the Proton?

Beach sand is a _____________.

Helium inside a balloon is a 

Who came up with the Atomic Theory of Matter?

Does not form a new substance

Ice changing directly to a gas is

The temperature at which a liquid turns to a gas.

Chlorine has how many neutrons?

What is Sodium's atomic number?

Density is a _____________ physical property.

Who proposed that electrons orbited the nucleus in energy shells?

A property only observed during a chemical reaction.

Who discovered the electron?

A characteristic of matter that changes when the size of the sample changes.

The Kinetic Molecular Theory states that all matter is

Milk is a ___________________ mixture

Who came up with the idea of valence?

A characteristic of matter not changed by the amount of the sample

Flourine has how many valence shells?

Who discovered the neutron?

An element's period tells you the number of an atom's

A substance stays at the melting point until the whole sample has melted due to the

Which is NOT a physical property?

The equation for density is

What scientist first came up with the concept of an Atom?

NaCl is a _____________________

An element's group determines an atoms number of 

An atomic model of Magnesium would have how many electron shells?

When two or more elements are blended without combining chemically, you have a