Question | Answer |
Matter exists in several states: solid, liquid, [...], and plasma | Matter exists in several states: solid, liquid, gas, and plasma |
gases have mass, but they have no definite [...] or volume | gases have mass, but they have no definite shape or volume |
gas molecules collide with the walls of the balloon and exert force. We call that force [...]. | gas molecules collide with the walls of the balloon and exert force. We call that force pressure. |
Pressure is defined as [...] per unit area. | Pressure is defined as force per unit area. |
The metric system's unit of pressure is the [...]. | The metric system's unit of pressure is the pascal. |
Because atmospheric pressure was first measured with a mercury barometer, you may see pressure measured in units of millimeters of [...]. | Because atmospheric pressure was first measured with a mercury barometer, you may see pressure measured in units of millimeters of mercury. |
[...] are compressible | Gases are compressible |
Another behavior of a gas is that the volume changes directly with [...]. | Another behavior of a gas is that the volume changes directly with temperature. |
As you change the amount of gas in a fixed volume, you change the [...]. | As you change the amount of gas in a fixed volume, you change the pressure. |
[...] molecules can move from one side of a room to the other. | Gas molecules can move from one side of a room to the other. |
a net movement of the molecules from an area of higher concentration (the onion) to an area of lower concentration (the opposite side of the room) is called [...]. | a net movement of the molecules from an area of higher concentration (the onion) to an area of lower concentration (the opposite side of the room) is called diffusion. |
[...] and [...] diffuse (spread out). | gasses and liquids diffuse. |
Chemists chose a standardized temperature and pressure of 273 K ([...]°C) and 100 kPa (1 atm) | Chemists chose a standardized temperature and pressure of 273 K (0°C) and 100 kPa (1 atm) |
When the particles [...] with something, they transfer energy. | When the particles collide with something, they transfer energy. |
Particles of a gas (or of a liquid or solid) are in constant [...]. | Particles of a gas (or of a liquid or solid) are in constant motion. |
kinetic energy = [...] energy | kinetic energy = movement energy |
The kinetic energy is proportional to the [...]. | The kinetic energy is proportional to the temperature. |
Gases are made of empty [...] and of particles, atoms or molecules. | Gases are made of empty space and of particles, atoms or molecules. |
Because gases are mostly empty space, they are [-ible]. | Because gases are mostly empty space, they are compressible. |
Matter exists in several states: [...], liquid, gas, and plasma | Matter exists in several states: solid, liquid, gas, and plasma |
Matter exists in several states: solid, [...], gas, and plasma | Matter exists in several states: solid, liquid, gas, and plasma |
gases have mass, but they have no definite shape or [...] | gases have mass, but they have no definite shape or volume |
Pressure is defined as force per unit [...]. | Pressure is defined as force per unit area. |
Chemists chose a standardized temperature and pressure of 273 K (0°C) and [...] kPa (1 atm) | Chemists chose a standardized temperature and pressure of 273 K (0°C) and 100 kPa (1 atm) |
Chemists chose a standardized temperature and pressure of 273 K (0°C) and 100 kPa ([...] atm) | Chemists chose a standardized temperature and pressure of 273 K (0°C) and 100 kPa (1 atm) |