Definitions
Anything that has mass and takes up space
Matter
Indefinite Volume & Shape
Gas
What is a physical change? Give an example.
A change that occurs and no new substance is formed.
What is the definition of the Law of Conservation of Mass? Must include entire definition.
The LOCM states that matter cannot be created or destroyed during a physical or chemical change. The initial and final mass are equal.
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, same amount of sunlight, and the same amount of liquid. In this investigation, what is the independent variable?
Type of Liquid
The amount of space an object takes up
Volume
This has no definite shape, but does have a definite volume
Liquid
What is a chemical change? Give an example.
A chemical change occurs when a new substance is formed.
If 115 g of a substance reacts with 84 g of another substance, what will be the mass of the products after the reaction?
199 g
Mr. S set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the dependent variable.
Distance
Flammability
If _________ is added to a liquid it become this gas.
Thermal Energy
Flammability and reactivity are examples of which type of properties?
Chemical properties
A student adds 15 g of baking soda to 10 g of vinegar in a beaker. A chemical reaction occurs and a gas is given off. After the reaction, the mass of the products remaining in the beaker is 23 g. Has mass been conserved in this reaction? Explain.
No, the initial and final mass are different.
David performed an investigation to find out how temperature affects crystal growth. What is the INDEPENDENT Variable?
Temperature
The ability to be scratched
Hardness
Which two phase changes occur when thermal energy is removed?
Condensation and Freezing
In a particle diagram, the particles rearranged after the change. What type of change occurred?
A chemical Change
A solid mass of 25 g is mixed with 60 g of a solution. A chemical reaction takes place and a gas is produced. The final mass of the mixture is 75 g. What is the mass of the gas released?
10 g
How does watching TV during studying affect a student’s test grades? Which variable is italicized?
Independent
The ability to conduct electricity
Electrical Conductivity
My particles slide past each and move at a medium speed, once thermal energy was added, my particles began to roam freely and move at a fast speed. What phase change occurred?
Evaporation
When a candle melts, a physical and chemical change is occurring. Name one physical change that is occurring and one chemical change that is occurring.
Melting is the physical change
Burning is the chemical change
During a chemical reaction, Jordan mixed water and an antacid tablet. The final mass of the substance was 98g. The mass of the water was 73g but Jordan is unsure of the mass of the antacid tablet. What is the mass of the antacid tablet?
25g
Kira wants to test which type of soda creates the biggest foam explosion when adding a Mentos candy. She chose Sprite, Coke, and Mountain Dew. One at a time, she added a single Mentos candy and measured the height of the foam eruption. Mountain Dew created a foam eruption of 7 inches. Coke and Sprite tied at 5 inches. What is her independent variable?
Type of Soda