Branches of Chemistry and Scientific Method
11. mass/volume
What is density?
16. Another name for a homogenous mixture
What is solution?
21. Table salt is classified as this type of matter.
What is a compound? and/or homogenous.
Jack wants to find out which laundry detergent cleans the best. He cuts a cotton sheet up into equal squares and stains each with chocolate. He washes 3 of the squares in different detergents and the fourth in plain water. Each load used the same amount of water and detergent, and was the same temperature.
What is the independent variable? What is the control?
IV: Type of detergent.
Control: Sample washed in plain water.
CHEMICAL or PHYSICAL CHANGE? (must get all 4)
A) A nail rusting
B) A nail melting
C) A nail bending
D) charcoal burning
What is A) Chemical B) Physical C) Physical D) Chemical?
RAPIDFIRE: 4 examples of colloids
(may vary) EX: fog, paint, whipping cream; marshmallows, corn starch/water mixture, milk, mayonnaise,
22. The symbol for sodium, and if it's a metal, nonmetal or metalloid.
What is Na, and metal?
Jack wants to find out which laundry detergent cleans the best. He cuts a cotton sheet up into equal squares and stains each with chocolate. He washes 3 of the squares in different detergents and the fourth in plain water. Each load used the same amount of water and detergent, and was the same temperature.
RAPIDFIRE: NAME THE CONSTANTS
Size of sheet squares; fabric (sheet), wash temperature; amount of water, amount of detergent, type and amount of chocolate.
8. Boiling point
What is physical, intensive property?
13. Factor that changes the density of an object
What is temperature?
18. Does not have a uniform composition throughout.
What is heterogenous?
BONUS RAPIDFIRE: 4 examples of suspensions
23. Name for element with symbol P
What is phosphorus?
The branch of chemistry most likely used in determining the chemical composition of a new substance.
What is analytical chemistry?
14. Good indicators for a chemical change
What is change of color, or production of heat or light.
19. Salad dressing is an example of this type of mixture
What is a suspension?
24. Simplest form of elements on earth
What are atoms?
An explanation for a large body of experiments or observations.
What is a theory?
15. Term for a descriptive observation such as color.
What is qualitative?
RAPIDFIRE: (2 ea) Name a separation method for 1) 2 solids 2) solid and liquid mixture 3) 2 liquids mixed together and basis to use
Answers may vary. EXAMPLES: 2 solids: 1) sieving [different sizes]; 2) sorting [different color, shape, size]; 3) magnetic sepn (one is magnetic)
Solid/liquid: Filtration (suspended solid); Evaporation (dissolved solid)
Liquid/Liquid: Distillation (boiling point); chromatography (polarity)
25. Name for element with symbol S. Is it a metal, nonmetal or metalloid?
What is sulfur, nonmetal?