Unit 1 Review HMH (2024)

Use the periodic table to identify which statement best describes carbon dioxide, CO2.

• It is an element that consists of 3 total atoms

• It is a compound that consists of 3 total atoms

• It is an element that consists of 3 total molecules

• It is a compound that consists of 3 total molecules.

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NGSS.MS-PS1-1

Think about the similarities and differences between elements and compounds. Which of the following is true?

• Elements and compounds are made of one kind of atom

• Elements and compounds are made of more than one kind of atom.

• Elements are made of molecules, and compounds are made of atoms.

• Elements are made of one kind of atom, and compounds are made of more than one kind of atom.

Glucose has the chemical formula C6H12O6. Which of the following is true about one molecule of glucose?

• It consists of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

• It consists of 12 carbon atoms, 6 hydrogen atoms, and 12 oxygen atoms.

• It consists of 6 carbon atoms, 6 hydrogen atoms, and 12 oxygen atoms.

• It consists of 12 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

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NGSS.MS-PS1-1

Elements and compounds are similar in some ways and different in others. Circle THREE correct answers.

• The chemical formula for chlorine gas is C.

• An element’s symbol must start with a capital letter.

• Elements are represented by a single chemical symbol.

• A compound, such as water, can have different chemical formulas.

• Compounds have multiple chemical symbols that together represent the elements that constitute the compound.

Bill has iron flakes, salt, water, and bromine. He makes a table to describe all the different substances he has made and to analyze the structure of these substances. Classify all the substances made of atoms.

• Iron (Fe)

• Salt (NaCl)

• Water (H2O)

• Bromine (Br2)

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NGSS.MS-PS1-1

Bill has iron flakes, salt, water, and bromine. He makes a table to describe all the different substances he has made and to analyze the structure of these substances. Classify all the substances made of molecules.

• Iron (Fe)

• Salt (NaCl)

• Water (H2O)

• Bromine (Br2)

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NGSS.MS-PS1-1

Bill has iron flakes, salt, water, and bromine. He makes a table to describe all the different substances he has made and to analyze the structure of these substances. Classify all the substances that are elements.

• Iron (Fe)

• Salt (NaCl)

• Water (H2O)

• Bromine (Br2)

Bill has iron flakes, salt, water, and bromine. He makes a table to describe all the different substances he has made and to analyze the structure of these substances. Classify all the substances that are compounds.

• Iron (Fe)

• Salt (NaCl)

• Water (H2O)

• Bromine (Br2)

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Classify all the elements

• Helium (He)

• Water (H2O)

• Chlorine (Cl2)

• Ammonia (NH3)

• Nitrogen Gas (N2)

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NGSS.MS-PS1-1

Classify all the compounds

• Helium (He)

• Water (H2O)

• Chlorine (Cl2)

• Ammonia (NH3)

• Nitrogen Gas (N2)

Tags

NGSS.MS-PS1-1