Elements and Compounds

Based on the chemical formula, which statement best describes NI₃?

• Based on the chemical formula, there are 4 TOTAL atoms in one molecule of NI₃.

• Based on the chemical formula, there are 6 TOTAL 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 4 different elements.

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NGSS.MS-PS1-1

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

• Images 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.

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

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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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Classify these molecules into elements and compounds and select the correct explanation for why the molecules fit into each category.

• Elements are made of only one type of atom, while compounds are made of two or more different atoms chemically bonded.

• Elements and compounds both contain only one type of atom.

• Compounds are made of only one type of atom, while elements are made of two or more different atoms.

• Elements and compounds are both made of two or more different atoms chemically bonded.

Which of the following best describes two similarities and one difference between the two chemical formulas, based on evidence from the table?

• They both contain the same elements, and have different numbers of atoms.

• They both have the same number of atoms, and have different elements.

• They both contain different elements, and have the same number of atoms.

• They both have the same number of atoms, and have the same elements.

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NGSS.MS-PS1-1

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

• H₂O

• H₂

• CO

• CO₂

• S₈

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Which of the following represent elements? Select all that apply.

• C₆

• H₂0

• H₂

• Fe₂O₃

• NH₃

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A small chunk of matter is made only from Gold atoms. This is an example of a:

• Chemical Symbol

• Compound

• Element

• Periodic Table

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The chart below lists some substances and their symbols. How many of these substances are examples of elements?

• 1

• 2

• 3

• 4

What is a pure substance that contains only 1 type of atom?

• Chemical Formulas

• An Element

• A compound

• An atom

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