Chemistry

Atoms

100

What is an atom?

An atom is the smallest unit of an element.

200

What subatomic particles are positively charged and live in the nucleus?

Protons

300

What is the name of the outer "rings" that float outside of an atom's nucleus?

These outer "rings" are called shells.

400

What subatomic particles live on the outer shells of an atom?

Electrons live on the outer shells of an atom?

500

True/False: All atoms of a particular element are identical. 

True.

Elements

100

What is an element? 

An element is a pure substance made of only one kind of atom. 

200

What is the chemical symbol for Copper?

Cu

300

What is the atomic mass of Iron?

55.845

400

How many protons does Sulfur have?

16.

500

How is the periodic table arranged?

The periodic table is arranged in order of increasing atomic mass.

Metals/Nonmetals/Metalloids

100

Malleable

Metal

200

Brittle

Nonmetals and Metalloids

300

Semi-conductors

Metalloids

400

Ductile

Metals

500

Gas at room temp.

Nonmetals

Molecules/Compounds

100

What is a molecule?

The joining of any two or more atoms, either atoms of the same element or atoms from different elements.

200

What is a compound?

A compound is a molecule made with at least two different elements.

300

Is O₂ only a molecule, or is it also a compound? Explain your thinking.

O₂ is only a molecule because it is made up of only two oxygen atoms. Only one element is included.

400

Is NaHO₃ only a molecule, or is it also a compound? Explain your thinking.

NaHO₃ is also a compound because two or more different element are joining together. 

500

What is the key difference between molecules and compounds?

All compounds are molecules, but not all molecules are compounds.

Chemical V. Physical Change

100

What is a physical change?

A physical change only changes the appearance of a substance, such as its shape, size or state of matter. No new substance is created.

200

What is a chemical change?

A chemical change results in the formation of a new substance.

300

Physical or Chemical? Be ready to explain your thinking:

Pieces of wood are burned during a campfire and turn into a pile of ash.

Chemical.

-Odor
-Color
-Absorbing Heat
-Ash is a new substance.

400

Physical or Chemical? Be ready to explain your thinking:

A popsicle melts in the hot sun.

Physical.

-Could be re-frozen
-No odor
-No new substance is created

500

Physical or Chemical? Be ready to explain your thinking:

Sugar gets mixed into boiling water.

Physical.

-Could be undone/separated.

-No color/odor

-No new substance.