Elements, Compounds, and Atoms

Based on the chemical formula, which statement best describes NI₃ (Nitrogen triiodide)?

• Based on the chemical formula, there are 3 atoms in one molecule of NI₃.

• Based on the chemical formula, there are 6 atoms in one molecule of NI₃.

• Based on the chemical formula, NI₃ is composed of atoms of the same elements.

• Based on the chemical formula, NI₃ is composed of atoms of different elements.

Tags

NGSS.MS-PS1-1

Look at the two images of molecules. Which of the following statements best compares the two images?

• Image A and B are both compounds because they have more than one atom.

• Image A is a compound because it has different types of atoms, and image B is an element because it has one type of atom.

• Image A is an element because it has one type of atom, and image B is a compound because it has different types of atoms.

• Image A and B are both elements because they have more than one atom.

Tags

NGSS.MS-PS1-1

Aluminum fluoride is a compound commonly used in ceramics. The chemical formula for aluminum fluoride is AlF₃. The Periodic Table shows the elements used in the compound.


Which of the following is true regarding aluminum fluoride?

• Aluminum fluoride contains 3 atoms of aluminum and 3 atoms of fluorine.

• Aluminum fluoride contains 1 atom of aluminum and 1 atom of fluorine.

• Aluminum fluoride contains 1 atom of aluminum and 3 atoms of fluorine.

• Aluminum fluoride contains 3 atoms of aluminum and 1 atom of fluorine.

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NGSS.MS-PS1-1

Which of these is an example of a compound?

• Cl₂

• NaCl

• FeO

Which of these is an example of an element?

• HCl

• NH

• O₂

Which of the 2 formulas has the most atoms?

Chemical Formula A: C₁₂H₂₂O₁₁

Chemical Formula B: 2C₆H₁₂O₆

• A

• B

Tags

NGSS.MS-PS1-1

Which of these molecules represent compounds? Select all that apply.

• NaCl

• FeO

• HCl

• NH

• Cl₂

Tags

NGSS.MS-PS1-1