Mrs. Crimmins is teaching her class about chemical compounds. She writes the formula C₂H₈O on the board. How many elements are in this compound?

• 2

• 1

• 3

• 0

Tags

NGSS.MS-PS1-1

Mrs. Crimmins is teaching her class about molecules. She shows a sample of a compound with the formula C₂H₈O. How many total atoms are in this compound?

• 11

• 2

• 8

• 1

Tags

NGSS.MS-PS1-1

Mrs. Crimmins gives Stapp a sample of MgCl₂. How many Chlorine atoms are in the sample?

• 2

• 1

• 3

Tags

NGSS.MS-PS1-1

During a science class, Mrs. Boroughs shows her students four different substances: H₂O, H₂, NaCl, and CaCO₃. The substance that represents an element is (a)   .

• H₂O
• H₂
• NaCl
• CaCO₃

Tags

NGSS.MS-PS1-1

During a science class, Mrs. Boroughs asked Crimmins and Stapp, "Which of these cannot be broken down into other substances?"

• Compound

• Mixture

• Solids

• Element

Mrs. Boroughs is teaching her class about substances. She asks, "What is made up of two or more elements that are chemically combined?"

• Element

• Mixture

• Compound

• Solids

Match each description with the correct term: element, compound, or mixture.

• A substance made of two or more types of atoms chemically bonded together.

• compound

• A substance made of only one type of atom, like the picture shown.

• mixture

• A combination of two or more substances that are not chemically bonded.

• element

Tags

NGSS.MS-PS1-1

Mrs. Stapp shows her class this picture during a science lesson. This picture represents which of the following?

• element

• compound

• mixture

Tags

NGSS.MS-PS1-1

During a science experiment, Mrs. Boroughs asked her students to identify if H₂SO₄ is an element or a compound.
What is the correct answer?

• Element

• Compound

Tags

NGSS.MS-PS1-1

Mrs. Boroughs is mowing the lawn in her backyard. Is mowing the lawn a physical or chemical change?

• physical

• chemical