UNIT TEST REVIEW: Atoms, LCM, Periodic Table, EC&M

What did Democritus, Dalton, Thompson, Rutherford, and Bohr have in common?

• Each scientist contributed to the ever evolving atomic theory.

• All of their models of the atom did not include subatomic particles.

• All four of the scientists are still alive today.

• All answers are correct.

A pure substance that cannot be separated into simpler substances by physical or chemical means is a (n)

• pure substance

• element

• compound

• mixture

A sample of matter, either a single element OR a single compound that is made up of one type of particle and has definite chemical and physical properties is a ________________.

• pure substance

• element

• compound

• mixture

Two or more elements combined physically, NOT chemically is called a ________.

• pure substance

• element

• compound

• mixture

A pure substance that is made of two or more different elements that are chemically combined is a(n) __________.

• mixture

• element

• solution

• compound

In the reaction

CuCl2 + Al ------> AlCl2 + Cu

• There is the same number of Al atoms but different numbers of Cu atoms.

• The atoms break apart during the reaction.

• There is the same number of each type of atom on each side of the reaction.

• The number of all the atoms changes during the reaction.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The law of conservation of mass (matter) states that during a chemical reaction matter.....

• is usually destroyed

• is usually created

• undergoes a physical change

• in neither created nor destroyed

Tags

NGSS.MS-PS1-5

Is this an element or compound?

Water (H20)

• Element

• Compound

Tags

NGSS.MS-PS1-1

Is this an element or compound?

Iron (Fe)

• element

• compound

Is this an element or compound?

Table Salt (NaCl)

• element

• compound

Tags

NGSS.MS-PS1-1