Vocabulary
a group of atoms joined together in a particular way
molecule
What happens to molecules movement when you transfer energy in?
They move faster
When the water was put outside it was a solid. Twelve hours later, the water had changed phase and was a liquid. What happened to the water molecules?
Solid-the molecules were moving in place. After, the molecules were moving around each other. (Liquid)
You have two substances, one with a strong and one with a weak attraction, and both are liquids right now. Which would you need to add less energy to get it to change to a gas?
The one with the weak attraction
Before becoming a teacher Ms. Kim had all the following jobs EXCEPT:
A- Target employee
B- Medical assistant
C- Tutor
D- Pre-school teacher
A- Target employee
the energy that an object has because it is moving
Kinetic energy
A scientist has a container with a substance inside. At first, the molecules in the substance move away from each other. Later, the molecules move around each other. What change did the scientist observe in the substance?
Before, the substance was a gas. Later, it was a liquid.
Andy measured the temperature of a pond near his house. Before he left for school, the water in the pond was 18°C. When he came home from school, the temperature of the pond was higher than it was in the morning. What happened to the water molecules while he was at school?
The molecules started moving faster
You have two substances, one with a strong and one with a weak attraction, and both are liquids right now. Which would you need to remove less energy to get it to change to a solid?
the one with strong attraction
What is Ms. Pereira's first name?
A. Sharon
B. Stephanie
C. Tiffany
D. Catherine
B. Stephanie
the way molecules in a substance move around relative to each other
freedom of movement
What happens to molecules kinetic energy when they move slower?
It decreases
What happens to molecules when their kinetic energy decreases?
They move slower
Lily is doing a science experiment with a substance in a sealed jar. At first, the substance’s molecules are moving around each other. What will happen to Lily’s substance if she transfers energy into the substance and causes a phase change?
After the phase change, the substance’s molecules will move . . .
faster, and the substance will be a gas.
What is our next holiday (no school)?
a. 1/19
b. 1/20
c. 1/21
d. 1/29
B. 1/20
to provide evidence that goes against a claim
refute
Mario is making chocolate. At the beginning of the chocolate-making process, the molecules were moving around each other. After the chocolate cooled the molecules moved in place . What was the phase change?
Liquid to solid
The fuel tank of an airplane has a device that measures the fuel’s temperature. Before the airplane took off, the temperature of the fuel was 27°C. After the airplane had been flying for one hour, the temperature of the fuel had decreased to 3°C. Which of the following must have happened to the molecules of the fuel?
The molecules started moving slower.
At room temperature, two substances are liquids. Scientists then transferred the same amount of energy out of both substances. When a scientist checked again, Substance 1 had changed phase, but Substance 2 had not. How are Substances 1 and 2 different?
Substance 1 has a . . .
stronger attraction between its molecules than Substance 2. Its molecules now move in place.
Red, White and Black
a pull between two molecules that is always the same for a substance
molecular attraction
Scientists put a sample of water into a sealed tank. Water can be a solid, liquid, or gas. At first, the molecules moving around each other. Then, the scientists transferred energy into the substance, and the molecules moved apart. What was the phase change?
liquid to gas
The medicine in the bottle has molecules that are moving around each other. The doctor needs to slow down the molecules enough to cause a phase change. How will she do this, and how will this affect the medicine?
She transfers energy . . .
out of the medicine until it is a solid.
A cook had a jar containing a sweet food and a jar containing a sour food. At room temperature, both foods are liquids. The same amount of energy was transferred into both substances. Later, the sour food had changed phase while the other had not. Why did the sour food change phase?
The sour food changed phase because it has weaker attraction. Liquid to gas.
Octopus