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Questions and Answers
Which of the following is NOT a pure substance?
Which of the following is NOT a pure substance?
- Water
- Carbon dioxide
- Milk (correct)
- Oxygen
If an unknown substance CANNOT be broken down into simpler substances, it is:
If an unknown substance CANNOT be broken down into simpler substances, it is:
- Both b and c (correct)
- A compound
- Made of one kind of atom
- An element
Water is a compound because it:
Water is a compound because it:
- Both a and b (correct)
- Can be broken down into hydrogen and oxygen
- Has a fixed composition
- Is made of water atoms joined together
Which of the following is a characteristic of a mixture?
Which of the following is a characteristic of a mixture?
Which of the following is a heterogeneous mixture?
Which of the following is a heterogeneous mixture?
You are about to open a container of soy milk but notice that there are instructions to 'shake well before serving.' The soy milk is most likely a:
You are about to open a container of soy milk but notice that there are instructions to 'shake well before serving.' The soy milk is most likely a:
Which of the following has the highest viscosity?
Which of the following has the highest viscosity?
A material that is malleable and conducts electricity is most likely:
A material that is malleable and conducts electricity is most likely:
Which of the following materials is useful for making molds because it has a low melting point?
Which of the following materials is useful for making molds because it has a low melting point?
What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter?
What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter?
Which of the following is a physical change?
Which of the following is a physical change?
A substance that has high reactivity:
A substance that has high reactivity:
During which of the following chemical changes does a precipitate form?
During which of the following chemical changes does a precipitate form?
Which of the following is evidence of a chemical change?
Which of the following is evidence of a chemical change?
Pure substances are either __________ or __________.
Pure substances are either __________ or __________.
A compound can be made from two or more elements or other _____ joined together in a fixed composition.
A compound can be made from two or more elements or other _____ joined together in a fixed composition.
Rust forms because iron and oxygen are highly ____ elements.
Rust forms because iron and oxygen are highly ____ elements.
When metal changes color because it has been heated, a(n) _________ change occurred. When a metal changes color because it has reacted with another substance, a(n) _________ change occurred.
When metal changes color because it has been heated, a(n) _________ change occurred. When a metal changes color because it has reacted with another substance, a(n) _________ change occurred.
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Study Notes
Pure Substances and Mixtures
- Milk is categorized as a mixture, not a pure substance.
- Pure substances can’t be broken down into simpler substances; they can be either elements or compounds.
Properties of Compounds
- Water is considered a compound because it can be broken down into hydrogen and oxygen, and it has a fixed composition.
Characteristics of Mixtures
- Mixtures can have varying properties, distinguishing them from compounds that have a fixed composition.
- Heterogeneous mixtures have components that are not uniform throughout, such as a jar of mixed nuts.
Types of Mixtures
- Soy milk is indicated as a suspension because it requires shaking before serving, suggesting it contains undissolved particles.
Viscosity of Liquids
- Corn syrup has the highest viscosity compared to milk, water, and orange juice, meaning it flows more slowly.
Properties of Metals
- Metals are generally malleable and conduct electricity, making them distinct from non-metal materials like wood or ice.
Molding Materials
- Wax is advantageous for making molds due to its low melting point, allowing easy shaping.
Separation Techniques
- Distillation is the method used to separate liquid mixtures that can pass through a filter, effectively isolating different components.
Physical and Chemical Changes
- Cutting wood is a physical change, while changes involving combustion, rust formation, or gas production indicate chemical changes.
Reactivity of Substances
- High reactivity means that a substance can easily combine chemically with others, such as iron reacting with oxygen to form rust.
Evidence of Chemical Changes
- Gas formation, like when vinegar mixes with baking soda, serves as clear evidence of a chemical change occurring.
Composition of Compounds
- Compounds consist of two or more elements or pure substances linked together in a specific, unchanging manner.
Changes in Metals
- A physical change occurs when metals change color due to heating; a chemical change occurs when they react with another substance.
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