Ch 1.Matter in our surroundings Flashcards
What is matter?
Anything that has mass and occupies space is called matter.
What is matter made up of?
Matter is made up of tiny particles called atoms.
What is melting point?
The minimum temperature at which a solid becomes a liquid is called its melting point
What are the factors affecting evaporation?
- Temperature
- Surface area
- Humidity
- Wind speed
What is the chemical name of the compound used in the activity demonstrating particles in matter? What is its formula?
Potassium Permanganate, KMnO4
Describe the activity with Potassium Permanganate.
A small crystal of potassium permanganate is added to water, coloring it. Even after multiple dilutions, the color persists.
What conclusion can be drawn from the Potassium Permanganate activity?
A small crystal contains millions of tiny particles (atoms).
Explain the sugar/salt in water example and how it proves that matter has space between its particles.
When sugar/salt dissolves in water, the volume doesn’t increase significantly because the sugar/salt particles occupy the spaces between water molecules.
Define intensive properties of matter
Properties that do not depend on the amount of matter present, such as density and color.
What is a physical change?
change that affects one or more physical properties of a substance without altering its chemical composition (e.g., melting ice).
What is a chemical property?
characteristic that can only be observed when a substance undergoes a chemical change (e.g., flammability, reactivity).
Describe how particles are arranged in solids
In solids, particles are closely packed together in a fixed arrangement and vibrate in place.
How do particles behave in liquids?
In liquids, particles are close together but can move past one another, allowing liquids to flow
What is the behavior of particles in gases?
In gases, particles are far apart and move freely at high speeds, filling the volume of their container
