Exploring the Building Blocks of Matter

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

• Molecule

• Atom

• Compound

• Mixture

Which of the following is a pure substance?

• Element

• Mixture

• Solution

• Alloy

What is a molecule?

• A type of mixture

• A single type of atom

• Two or more atoms bonded together

• A compound that can be broken down into elements

Tags

NGSS.MS-PS1-1

What is the difference between a compound and a mixture?

• Compounds can be separated by physical means, mixtures cannot

• Mixtures have chemical bonds between components, compounds do not

• Compounds have chemical bonds between components, mixtures do not

• There is no difference; they are the same thing

Which of the following is an example of a compound?

• Air

• Salt water

• Water (H2O)

• Sand and iron filings

Tags

NGSS.MS-PS1-1

How many elements are in a molecule of water (H2O)?

• 1

• 2

• 3

• 4

What is a characteristic of elements?

• They can be separated into simpler substances

• They are made of two or more types of atoms

• They consist of only one type of atom

• They are always liquids at room temperature

Which of the following is a mixture?

• Sodium chloride (NaCl)

• Carbon dioxide (CO2)

• Salad

• Iron (Fe)

What is the main difference between homogeneous and heterogeneous mixtures?

• Homogeneous mixtures are always liquids, heterogeneous mixtures are not

• Heterogeneous mixtures have uniform composition, homogeneous mixtures do not

• Homogeneous mixtures have uniform composition, heterogeneous mixtures do not

• There is no difference; they are the same

Which of the following is true about atoms and molecules?

• Atoms are larger than molecules

• Molecules can exist independently, but atoms cannot

• Atoms combine to form molecules

• Molecules are found on the periodic table

Tags

NGSS.MS-PS1-1