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Questions and Answers
Which of the following is the MOST accurate description of matter?
Which of the following is the MOST accurate description of matter?
- Only solids and liquids that can be seen and touched.
- Substances that undergo chemical reactions.
- Anything that occupies space and has mass. (correct)
- Elements and compounds that are essential for life.
Which statement BEST describes the key difference between physical and chemical changes?
Which statement BEST describes the key difference between physical and chemical changes?
- Physical changes alter the appearance of a substance, while chemical changes alter its molecular composition. (correct)
- Physical changes produce new gases, while chemical changes produce solids.
- Physical changes involve energy changes, while chemical changes do not.
- Physical changes are always reversible, while chemical changes are always irreversible.
Consider a glass of ice water. When the ice melts, which of the following BEST describes the changes that occur?
Consider a glass of ice water. When the ice melts, which of the following BEST describes the changes that occur?
- No change occurs; it is simply a change in temperature.
- A physical change occurs as the water transitions from a solid to a liquid state. (correct)
- Both a physical and chemical change occur simultaneously.
- A chemical change occurs because the water molecules are rearranged.
A student observes that when iron rusts, it becomes reddish-brown and flaky. Which of the following statements BEST explains why rusting is classified as a chemical change?
A student observes that when iron rusts, it becomes reddish-brown and flaky. Which of the following statements BEST explains why rusting is classified as a chemical change?
Which of the following scenarios BEST demonstrates a physical change that is easily reversible?
Which of the following scenarios BEST demonstrates a physical change that is easily reversible?
Flashcards
What is matter?
What is matter?
Anything that has mass and takes up space, existing as solid, liquid, or gas, and composed of elements and compounds.
Changes in matter
Changes in matter
These refer to physical or chemical transformations when a substance undergoes modification, occurring in solid, liquid, or gas states.
What are Physical Changes?
What are Physical Changes?
A change in one or more physical properties of a substance (shape, size, state) WITHOUT changing its chemical composition; often reversible.
Characteristics of Physical Change
Characteristics of Physical Change
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What are Chemical Changes?
What are Chemical Changes?
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Study Notes
- Matter has mass and takes up space.
- Matter exists as a solid, liquid, or gas.
- Matter can be composed of various elements and compounds.
- Atoms and molecules are also considered matter.
Changes in Matter
- Changes in matter refer to physical or chemical transformations a substance undergoes.
- These changes can occur in solid, liquid, or gas states.
- Changes can be brought about by shifts in temperature, pressure, or chemical composition.
Physical Changes in Matter
- Physical changes involve a change in one or more physical properties of a substance, like its shape, size, or state.
- Crucially, physical changes do not alter the chemical composition of the substance.
- Physical changes can often be reversed by changing the conditions that caused the change.
- Physical changes do not result in the formation of new substances.
- A substance changes in state when it transitions between solid, liquid, or gas due to shifts in temperature or pressure.
- Physical changes often involve alterations in a substance's appearance, texture, or shape.
- Examples of physical change:
- Transitioning from a solid to a liquid state without altering composition.
- Transforming from a liquid to a gaseous state through heat.
- Altering the shape of a can without changing its materials.
Chemical Changes in Matter
- Chemical changes involve a change in the chemical composition of a substance.
- Chemical changes result in the formation of one or more new substances.
- Chemical changes are usually irreversible.
- Chemical changes involve the breaking and forming of chemical bonds between atoms or molecules.
- Chemical changes include formation of new substances
- Formation of new substances is due to breaking and forming of chemical bonds between atoms and molecules.
- The original substances are not restored through simple physical processes in chemical changes.
- Alterations in color, odor, taste or production of gas or precipitate are characteristic of chemical changes.
- Examples of chemical change:
- Baking a cake, involving a chemical reaction between ingredients.
- The breakdown of molecules into simpler substances in the body.
- The reaction of iron with oxygen in the presence of moisture.
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