Physical and Chemical Changes
A change that affects one or more physical properties of a substance without changing its chemical composition.
What is a physical change?
The total distance traveled in a certain amount of time.
What is average speed?
Conduction, convection, and radiation.
What are the three methods of heat transfer?
A homogeneous mixture where one substance (the solute) is dissolved in another (the solvent).
What is a solution?
Count the atoms that are in the molecule H2O
What is 3?
Rust forming on iron.
what is an example of a chemical change.
Speed= Distance/Time
What is the formula used to calculate speed.
Heat transfer through direct contact between materials.
What is conduction?
The solute is the substance that is dissolved, while the solvent is the substance that does the dissolving.
What is the difference between a solute and a solvent?
In the chemical formula C6H12O6, how many carbon atoms are present?
What is 6?
Indicators include color change, gas production, temperature change, or the formation of a precipitate.
What is a chemical change?
A car is traveling 30 miles in 25 minutes, and a truck is traveling 40 miles in 22 minutes. Who is traveling faster?
What is the truck?
Heat transfer through the movement of fluids (liquids and gases) caused by temperature differences.
What is convection?
The amount of solute in a given volume of solvent or solution.
What is concentration?
If a chemical formula has a big number in front of the formula, what must you do?
What is multiply that number times everything in the formula?
The arrangement of the molecules changes, but their chemical structure remains the same.
What is a physical change?
A horse runs 400 meters in 2 minutes. Solve for speed.
What is 200 meter/minute?
Heat transfer through electromagnetic waves, such as sunlight.
What is radiation?
Adding more solvent to decrease the concentration of the solute
What is dilution?
Count the number of oxygen atoms in the formula 4Fe2O3
What is 12?
What do we call the solid that forms when 2 liquids are added together?
What is a precipitate?
If 2 vehicles are traveling side by side and vehicle A is traveling at 0.78 mi/min and the vehicle B is traveling at 0.73 mi/min, which is traveling faster?
What is vehicle A?
The sun heats up the earth.
What is radiation?
If I describe a solution and say that it has more solute added to the solvent, what am I describing?
What is a concentrated solution?
Count how many hydrogen atoms are present in the formula 3Ca(OH)2.
What is 6?