Name the scale we use to determine the acidity of a substance.
What is the pH scale?
200
What is a chemical change?
What is something that turns the substance into something new?
200
Name the charges of the 3 subatomic particles.
What is proton (+), neutron (Neutral), and electron(-)?
200
Name the 2 main pure substances.
What is and element and a compound?
200
What does it mean if an object floats on water?
What is the object is less dense than the water?
200
What does the scale go from?
What is 0-14?
300
Are phase changes physical or chemical and why?
What is physical because you can reverse it to get the original back?
300
What does the atomic number represent?
What is the # of protons in the nucleus of an atom?
300
Name the main difference between a mixture and a pure substance.
What is mixtures do not chemically combine and can be physically separated and pure substance do chemically combine and cannot be physically separated?
300
Name the units for mass and volume.
What is grams and centimeters cubed or milliliters?
300
What are the values for acids?
What is 0-3 is a strong acid and 4-6 are weak acids?
400
Name 2 signs of a physical change.
What is change size or shape or it's a phase change?
400
Put the subatomic particles in order from largest to smallest.
What is neutron, proton, electron?
400
Name 5 ways to physically separate a mixture.
What is boiling, filtering, evaporating, centrifuging, using a magnet, etc?
400
Calculate the density of a block of wood 3.0cm on each side having a mass of 27g.
What is 1g/cm3
400
What are the values for bases?
What is 9-11 are weak bases and 12-14 are strong bases?
500
Name 4 signs of a chemical change.
What is
1. produces an odor, heat, light or sound
2. produces a gas
3. changes color
4. forms a precipitate
5. temperature change
500
Name what a row and a column are called on the periodic table.
What is period (row) and group or family (column)?
500
Define a solution.
What is a homogeneous mixture where one substance dissolves into another?
500
Density is a characteristic property. Define a characteristic property.
What is it doesn't matter the size of the sample the property is always the same for the substance?
500
Explain what a salt is and how they're made.
What is a neutral substance and it's made when an acid and a base combine?