Molecules, Atoms, and Compounds 8th Grade Science FL

The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?

• 1

• 2

• 6

• 7

Tags

NGSS.MS-PS1-1

In the chemical reaction shown, the products are best classified as

• two elements

• one element and one compound

• two compounds

• two compounds and one element

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Based on its chemical formula, which of the following substances is an organic compound?

• Urea, CH4N2O

• Hydrogen, H2

• Dioxide, 02

• Iron, Fe

Tags

NGSS.HS-LS1-6

Which of the following contains one or more elements that are chemically combined?

• an element

• an atom

• a molecule

• a compound

Tags

NGSS.MS-PS1-1

Which option contains only compounds?

• Na, NaCl, Fe, CO2

• Au,Ni, Fe, Cu

• NaCl, KNO3, CO2

• Au, Hg, NH3, Ag

Tags

NGSS.MS-PS1-1

Does the image below illustrates a

• atom

• element

• compound

• mixture

Tags

NGSS.MS-PS1-1

Your teacher conducts a reaction to make iron sulfide from iron and sulfur. What happens to the properties of matter of the elements that your teacher starts with compared to the compound that is made?

• The mass increases as the iron sulfide is made.

• The starting elements undergo a physical change leading to no change in the physical properties.

• The physical properties of the compound iron sulfide changed compared to the properties that iron and sulfur had independently.

• The reactivity of iron is greater than sulfur.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Identify the picture that illustrates an compound

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

The starting materials of the reaction below illustrate a

• element

• compound

• mixture

• atom

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

In order to make the compound NH3 shown on the product side of the chemical equation nitrogen and hydrogen had to undergo a _____________ reaction.

• physical

• chemical

• conservation of energy

• conservation of mass

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5