Atomic Structure Timeline and Classification of Matter

Which of the following is not a pure substance?

•  $H_2O$  

•  $O_2$  

• Silver

• 14 k Gold

Milk is a(n)

• Element

• Compound

• Heterogeneous Mixture

• Homogeneous Mixture

Which of the following could only be separated by chemical means?

• Water

• Salt water

• Phosphorous

• Maple syrup

Tags

NGSS.MS-PS1-1

Which Greek philosopher first proposed the idea of an indivisible particle of matter?

• Aristotle

• Democritus

• Empedocles

• Socrates

According to the prevailing wisdom prior to 1500 AD, matter was composed of

• four elements: earth, air, fire, and water.

• atoms.

• protons, neutrons, and electrons.

• indivisible particles.

Which of the following pairs of substances illustrate the Law of Constant Compositions?

• $CO_2\ and\ H_2O$

• $NO_2\ and\ O_2$

• $NO_2\ and\ NO_3$

• $Cl_2\ and\ F_2$

This picture represents: 

• Element
• Compound
• Mixture of Elements
• Mixture of Compounds

Tags

NGSS.MS-PS1-1

A mixture in which different materials can be identified easily

• element
• heterogeneous mixture
• homogeneous mixture
• solution

A mixture that contains two or more substances blended evenly throughout

• heterogeneous mixture
• homogeneous mixture
• suspension
• colloid

Which of the following is an element?

• Sugar
• Salt
• Water
• Oxygen