U1-L3: Molecules & Extended Structures

What is a pure substance?

• A mixture of different types of matter

• A sample of matter with specific chemical and physical properties

• A type of matter that changes its properties frequently

• A combination of gases and liquids

Tags

NGSS.MS-PS1-4

What is true about pure substances?

• They are mixtures of different types of matter

• They are made up of only one type of matter throughout

• They have no specific properties

• They are always in liquid form

Tags

NGSS.MS-PS1-4

What is the smallest unit of an element that keeps the properties of that element?

• Molecule

• Atom

• Chemical bond

• Compound

Tags

NGSS.MS-PS1-1

What do you call two or more atoms held together by chemical bonds?

• Element

• Atom

• Molecule

• Ion

Tags

NGSS.MS-PS1-1

What is the attractive force that holds atoms together?

• Chemical bond

• Physical bond

• Ionic bond

• Magnetic bond

Tags

NGSS.HS-PS1-3

NGSS.HS-PS1-4

What is a molecule called when all the atoms are of the same type?

• Compound

• Element

• Mixture

• Solution

What is a compound?

• A substance made of one type of atom

• A pure substance made up of two or more different types of atoms joined by chemical bonds

• A mixture of different elements

• A single atom

Tags

NGSS.MS-PS1-1

Which of the following is an example of a compound?

• Oxygen molecule (O2)

• Water molecule(H20)

• Helium gas (He)

• Nitrogen molecule (N)

Tags

NGSS.MS-PS1-1

In what ratio do hydrogen and oxygen atoms combine in water?

• One hydrogen to one oxygen

• Two hydrogen to one oxygen

• One hydrogen to two oxygen

• Three hydrogen to one oxygen

Tags

NGSS.MS-PS1-1

Why are models of molecules important for scientists?

• They are used to directly observe molecules.

• They help visualize molecules that are too small to see.

• They make molecules larger.

• They change the properties of molecules.

Tags

NGSS.MS-PS1-1