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Questions and Answers
Which of the following statements accurately describes the relationship between elements and compounds?
Which of the following statements accurately describes the relationship between elements and compounds?
- Elements and compounds are different terms for the same type of substance.
- Elements are made of molecules, while compounds are made of atoms.
- Elements consist of only one type of atom, while compounds consist of multiple types of atoms chemically bonded together. (correct)
- Elements can only be formed through chemical changes, whereas compounds exist naturally.
A physical change alters the chemical composition of a substance, creating a new substance with different properties.
A physical change alters the chemical composition of a substance, creating a new substance with different properties.
False (B)
Explain how water demonstrates that a compound has different properties than its constituent elements.
Explain how water demonstrates that a compound has different properties than its constituent elements.
Water, a compound of hydrogen and oxygen, is a liquid that can extinguish fire, while hydrogen is a flammable gas and oxygen supports combustion. This shows the properties of water differ greatly from hydrogen and oxygen.
Table salt is a compound formed when the poisonous elements sodium and _________ combine.
Table salt is a compound formed when the poisonous elements sodium and _________ combine.
Match the following terms with their correct definition:
Match the following terms with their correct definition:
What distinguishes a chemical change from a physical change?
What distinguishes a chemical change from a physical change?
Every molecule of a specific compound has the exact same chemical composition.
Every molecule of a specific compound has the exact same chemical composition.
Describe the process by which rust forms, and identify it as a chemical or physical change.
Describe the process by which rust forms, and identify it as a chemical or physical change.
Matter that consists of only one kind of atom is called an ______.
Matter that consists of only one kind of atom is called an ______.
Which of the following is an example of a compound?
Which of the following is an example of a compound?
Flashcards
Atom
Atom
The smallest unit of matter; too small to see with the naked eye.
Molecule
Molecule
A particle made of two or more atoms joined together.
Element
Element
Matter containing only one type of atom.
Compound
Compound
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Chemical Change
Chemical Change
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Rust
Rust
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Study Notes
Atoms and Molecules
- All matter consists of tiny particles known as atoms, which are too small to see.
- Matter typically includes multiple types of atoms.
- An element is a substance that contains only one kind of atom; examples include gold, silver, and oxygen.
- Scientists have identified and named over 100 different elements.
- Atoms can combine to form molecules.
- Air contains oxygen and water molecules, where oxygen molecules contain only oxygen atoms.
- Water molecules contain both hydrogen and oxygen atoms.
- A compound is a substance made by combining different elements.
- Water is a compound composed of hydrogen and oxygen.
Compounds
- Compounds are new substances with properties distinct from their constituent elements.
- Water differs from hydrogen and oxygen; hydrogen is a flammable gas, oxygen supports combustion, but water does not burn and can extinguish fires.
- Every molecule of a compound is chemically identical; every water molecule has two hydrogen atoms and one oxygen atom.
- Compounds are formed through chemical changes, where atoms combine to form new substances.
- Chemical changes cause elements or compounds to lose their individual properties and transform into a new substance with different properties.
- Sodium and chlorine are poisonous elements that combine to form the compound table salt.
- Rust forms on iron tools due to a chemical change when oxygen in water combines with iron.
- Baking brownies involves chemical changes where flour, eggs, and other ingredients transform into a new substance.
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