Properties
Name a chemical property we tested in class.
What is reactivity to HCl (acid)?
What are the three states of matter we covered in class?
Solids, liquids and gases.
This is what the V stands for in the formula to solve for density.
What is volume?
What are some positives about plastics?
Answers may vary. Hopefully they were good answers.
This state of matter has particles that are the farthest apart, rarely touch, and no definite volume or shape.
What is a gas?
Name 4 physical properties we have looked at in class.
What is state, density, solubility, odor, appearance, melting point and boiling point?
What happens to the kinetic energy of a liquid when the temperature drops?
A decrease in kinetic energy
This is the formula to solve for density.
Density = mass (divided by) volume
What are some negative impacts of plastic?
Answers may vary. Hopefully they were good answers.
This state of matter has a definite volume, but no definite shape as the particles have a little space to move creating a fluid movement.
What is a liquid?
What is solubility?
Lightning, electric sparks, fluorescent lights, neon lights, plasma televisions, some types of flame and the stars are all examples of illuminated matter in the _________ state.
What is plasma?
Jane measures a piece of metal and determines it has a mass of 10 grams and a volume of 2 cm3. What is the density of the piece of metal?
5 grams per centimeter3
Plastics are made from ________ & _________ compounds.
What is hydrogen and carbon?
How can we change an element's state?
Increasing or decreasing kinetic/thermal energy
How are chemical properties different from the physical properties you explored in the previous activity?
A chemical property involves a potential reaction with another substance. A physical property does not involve another substance.
Most elements are in this state of matter at room temperature.
What is solid?
Mineral oil is less dense than water. Mercury, a liquid metal, is more dense than water.
If mineral oil, mercury, and water were mixed together, which liquid would float to the top?
What is Mineral oil?
Explain how a life-cycle diagram would or would not be a useful tool for the director of a drink company who wants to choose a single-use container for a new drink.
It would be useful for the director because they could see all of the different stages and think about what that would mean for the cost of making the bottle.
Freezing is an example of a state change—when a liquid becomes a solid.
Explain what you think happened to the water molecules during this state change.
When the water froze, the water molecules became tightly packed together and more connected.
At that point, they could only vibrate but not move around.
Why is it important for scientists to observe multiple physical properties in order to identify an element?
If scientists only look at one or two physical properties, they might identify the element incorrectly. Looking at multiple properties means they are more likely to be correct.
The compound sucrose has a chemical formula of C12H22O11.
How many elements are in one molecule of sucrose?
Three
Name the 4 types of plastics we dropped in water to test the density.
What is Polypropylene, Polyvinyl
chloride, High-density polyethylene, Polystyrene?
Plastics are made of long chains of ___________, called polymers.
What is hydrocarbons?
What happens during a state change?
During the state change, the temperature stays constant until all of the connections between particles are broken.
Once the state change is complete, the thermal energy once again raises the temperature because the particles are free to speed up.