Steps in Scientific Method
I.
Observe a problem or a question.
II. Research
III. Create a Hypothesis
IV. Experiment
A.
Design the experiment
1. Control
2. Independent Variable
3. Dependent Variable
B.
Carry out experiment
V. Collect and Analyze Data
A.
Graph or other mathematical relationship
B.
Interpret graph looking for trends
VI. Create conclusion
VII. Communicate findings
Chemistry Scientific Method Exercise
Name_________________________ Per ___
Problem:
What would you research?
What would be your Hypothesis?
Describe your Experimental Plan.
What equipment or supplies do you think you would need?
What data collection methods would you employ?
What data analysis methods would you use?
What do you think your conclusion would be?
Who would you present the results to?
Chemistry Matter Worksheet I
1. Describe the 7 steps in Scientific Method.
a.
b.
c.
d.
e.
f.
g.
2. What is a hypothesis?
3. Experimentation
a. Variables
1. Independent variables
2. Dependent variables
b. Controls
4.
a. Empirical Data
b. Theory
c. Model
d. Scientific Law
Name______________________________ Per ___
Chemistry Matter & Energy II
Name__________________
1. Chemistry
a. Define
b.
Describe 6 branches of Chemistry
i. Organic
ii. Inorganic
iii. Physical
iv. Analytical
v. Biochemistry
vi. Theoretical
2.
Matter
3.
Mass
4.
Volume
4. Element
a. Define
b. Metals
c. Non-metals
d. Metalloids
e. Noble Gases
5. Compound
6. Atom
7. Molecule
8. Physical Properties
a. density
b. Color
c. malleable
d. ductile
e. high viscosity
Period___________
Chemistry
Matter Worksheet III
f. brittle
g. hardness
h. melting and boiling points
i. texture
j. low viscosity
9. Physical Change
10. Chemical Properties
a. How does it react with water?
b. How does it react with oxygen?
c. How does it react with _____?
11. Chemical Change
a. Reactants
b. Products
c.
Change of quantity of matter
12. States of matter
a. Solids
b. Liquids
c. Gases
d. Plasmas
13. Diatomic Molecules
14. Kinetic energy
15. Potential energy
Name _________________________Per._________
Chemistry Matter Worksheet IV
16. Energy Transformation
Name _________________________Per._________
17. Mass relates to energy
18. Law of Conservation of Matter & Energy
19. Changes of state
a. Freezing
b. Melting
c. Vaporization
d. Condensation
e. Sublimation
20. Endothermic
21. Exothermic
I. Differentiate: Definitions and examples are needed
a.
Homogeneous vs Heterogeneous
b. Element(atom) vs Compound(molecule)
c. Accuracy vs precision
III. Contrast: Be specific with properties and energy differences.
a. Solids
b. Liquids
c. Gases
Chemistry
IV.
Matter Worksheet V
Name _________________________Per._________
Define and differentiate from the others:
a. Pure substance
b. Mixture
c. Solution(may have to look beyond)
d. Compounds(How to distinguish from mixture)
V. Define:
a. Physical separation
b. Filtration
c. Chromatography
d.
Distillation
VI. Compare or contrast:
e. Physical Properties compared to Chemical Properties
f.
Physical Change compared to Chemical Change
g. How do intensive properties differ from extensive properties?
Chemistry Matter Worksheet VI
Name _________________________________ Sect.
Using the rules of Uncertainty Factors, calculate the answers to the following questions.
I.
Find the total volume of the sample if 3 different graduated cylinders are used with these volumes being
blended together to make one volume: a. 103±1 ml b. 75.1±.5 ml c. 2.04±.2 ml
II.
Find the volume poured into a beaker if a graduated cylinder starts with 95.7±.5 ml before pouring and then
has 35.0±.5 ml after pouring.
III.
Find the area of a board whose dimensions are 75.9±1 cm. and 156.2±1 cm.
IV.
Find the Density of a rubber ball that has a mass of 251±1 grams and a volume of 210±1 ml.
V.
Find the volume of a piece of glass that is 275±1 cm x 35±1 cm x 2.96±.5 cm.
Answers: I. 180±1.7 ml II. 60.7±1.0 ml III. 1.19e4±156 cm2 IV. 1.20±.006 g/ml V. 2.89e4±4813 cm3
Honors Chemistry Worksheet VII Density
1.
2.
3.
4.
Name _________________ Section ____
What is the volume of a tank that can hold 18, 754 Kg of methanol whose density is 0.788g/cm3? Ans.= 2.38e7cm3
x
x
What is the density of a board whose dimensions are 5.54 cm x 10.6 cm X 199 cm and whose mass is 28.6 Kg?
Ans. = 13.6g/ml
5.
CaCl2 is used as a de-icer on roads in the winter. It has a density of 2.50 g/cm3. What is the mass of 15.0 L this substance?
Ans. = 3.75e4g
6.
AN OBJECT HAS A MASS OF 42.0 GRAMS WHEN WEIGHED IN AIR. WHEN WEIGHED IN CARBON TETRACHLORIDE, IT
WEIGHS 34.0 GRAMS. THE DENSITY OF CARBON TETRACHLORIDE IS 1.59g/ml. FIND THE DENSITY OF THE OBJECT.
ans. 8.35g/ml
7.
AN OBJECT WEIGHS 240 GRAMS IN AIR AND 200 GRAMS IN A LIQUID WHEN SUBMERGED. THE DENSITY OF THE OBJECT
IS 13.69 g/ml. FIND THE DENSITY OF THE LIQUID.
ans. 2.29g/ml
8.
WILL A 100 GRAM OBJECT WEIGH LESS IN ACETONE(DENSITY .789g/ml) OR IN ACETIC ANHYDRIDE(DENSITY 1.08g/ml).
ANSWER BY FINDING THE MASS OF THE OBJECT IN EACH OF THE LIQUIDS. ASSUME THE DENSITY OF THE OBJECT TO BE
5.6 g/ml.
ans. 85.9g & 80.7g
9.
OUTLINE THE STEPS NEEDED TO DETERMINE IF AN OBJECT IS ACTUALLY MADE OF PURE GOLD AS REPORTED BY THE
MANUFACTURER.
10. A HOT AIR BALLOON HAS THE VOLUME OF 260,000 GALLONS. THE DENSITY OF AIR IS .00058 g/ml. WHEN HEATED THE
DENSITY DROPS 35%. FIND THE MASS OF CARGO THAT COULD BE LIFTED BY THE BALLOON. ans. 438.7 POUNDS
11. THE DENSITY OF SULFURIC ACID IS 2.58 g/ml. FIND THE MASS OF A GLASS SPHERE WHEN IT IS SUBMERGED IN THE
ACID. THE GLASS SPHERE LOSES .57 POUNDS WHEN SUBMERGED IN WATER. THE DENSITY OF THE GLASS IS 3.5 g/ml.
ans. = 238g
12. AN OBJECT WEIGHS 500 g IN AIR AND 305 g IN A GREEN LIQUID. THE OBJECT WEIGHED 275 g WHEN SUBMERGED IN
WATER. FIND THE DENSITY OF THE OBJECT AND THE GREEN LIQUID.
ans. = .867g/ml
13. IF AN OBJECT WEIGHS 500 POUNDS IN AIR AND WHEN IMMERSED IN A LIQUID IT WEIGHS 3987 OUNCES, WHAT IS THE
DENSITY OF THE OBJECT? THE DENSITY OF THE LIQUID IS 3.78 g/ml.
(ANS. = 7.52 g/ml)
14. A 2 Kg BOTTLE OF OIL COSTS $5.86. FIND THE COST OF OILING THE PAN FOR COOKING PANCAKES IF IT TAKES 6 GRAMS
OF OIL FOR EACH PANCAKE. 500 PANCAKES ARE BEING COOKED.
(ANS. = $8.79)
THIS OIL HAS A DENSITY OF 2.54 g/ml. WHAT IS THE VOLUME OF THE BOTTLE OF OIL.
(ANS. = 787ml)
15. AN OBJECT WEIGHS 234 TONS IN AIR AND 5.5E3 Kg WHEN SUBMERGED IN A STRANGE SMELLING FLUID. WHEN
SUBMERGED IN WATER THE OBJECT WEIGHS ONLY 195 TONS. FIND THE DENSITY OF THE FOUL SMELLING FLUID.
(ANS. = 5.9g/ml)
16. FIND THE DENSITY OF A SUBSTANCE THAT WEIGHS 35 g AND TAKES UP 25 CUBIC INCHES. FIND THE ANSWER IN g/ml.
(ANS. = .085g/ml)
17. FIND THE DENSITY OF A SUBSTANCE THAT WEIGHS 2.75 Kg AND TAKES UP 250 CUBIC FEET. FIND THE ANSWER IN g/ml.
(ANS. = 3.88E-4 g/ml)
18. DETERMINE THE VOLUME THAT 35.2 POUNDS WILL OCCUPY IF THE DENSITY IS 16.5 g/in3. FIND THE VOLUME IN ml.
(ANS. = 1.58e4 ml)