An element is.....
An atom is.....
A molecule is.....
A substance is.....
A property is.....
If you could use a powerful microscope to see the particles in a gas, what would you see between the particles?
Which of the following is true about odors?
What happens to the molecules in a substance that changes from a liquid to a solid?
A ball made of an unknown substance is a solid at room temperature. A block made of a different substance is also a solid at room temperature. Their melting points would be
Oxygen, hydrogen, and water are substances. Which of these substances are elements?
[Select all that apply.] Options:
A. Oxygen
B. Hydrogen
C. Water
D. None of These
In the following models, each small dot represents a wax molecule. Which model best represents what happens when solid wax melts?
A water molecule in the gas phase is _________________ a water molecule in the solid phase.
When ammonia at 24°C is cooled to 0°C, the ammonia molecules ________________________.
A pot of water on a hot stove begins to boil rapidly, and a cold glass lid is placed on the pot. Water droplets immediately begin forming on the inside of the lid. What happened?
A student lets some of the gas escape by opening and closing the flask. Which of the following models best represents the gas that remains in the flask?
When a thermometer is heated, the red liquid inside the thermometer moves upward. This is because ___________.
When you heat a sample of gas, what happens to the particles that make up the gas?