Ost Physical Science Review

S8P1a Which is an example of a mixture?

• water

• hydrogen gas

• a blueberry muffin

• a spoon made of the element silver

S8P1a Which of the following is an example of a pure substance?

• a sample of oxygen gas

• a solution of sugar water

• a mixture of pasta and sauce

• an alloy of iron and carbon

S8P1a Ammonia can be represented by the chemical formula NH₃. Which of the following best describes ammonia?

• an atom

• a compound

• an element

• a mixture

Tags

NGSS.MS-PS1-1

S8P1a An unknown substance is provided in a science class. It consists of particles that are different colors and different sizes. The particles are unevenly distributed throughout the substance. The substance is ___________.

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

S8P1a A diagram of a particle is shown above. The particle is most likely _________.

• an atom

• a molecule

• a homogeneous mixture

• a heterogeneous mixture

Tags

NGSS.MS-PS1-1

S8P1e Which are the name and atomic number for the element?

• K and 19

• K and 39.098

• Potassium and 19

• Potassium and 39.098

Tags

NGSS.MS-PS1-1

S8P1e An atom of the element has how many protons?

• 18

• 19

• 39

• 58

Tags

NGSS.MS-PS1-1

S8P1e Which of the following could be the chemical symbol representing the element cobalt?

• co

• Co

• CO

• Cob

S8P1e The model shows a neutral atom. How many protons are in this atom?

• 2

• 4

• 5

• 9

Tags

NGSS.MS-PS1-1

S8P1e In which period, or row, of the periodic table would you find this element?

• Period 2

• Period 4

• Period 6

• Period 7

Tags

NGSS.MS-PS1-1