1. Intro to Chemistry

2. Chemistry is the study of matter and the changes it undergoes.
What is Chemistry?
Chemistry is the study of matter and the changes it undergoes.
Write students observations from the video and come up with an idea of what chem is
Take a look at the word matter.

3. Matter is anything that has mass and takes up space.
What is matter?
Matter is anything that has mass and takes up space.
Take a look at the word mass. What does it mean to have mass?

4. Mass vs. Weight Mass Reflects the amount of matter in an object
Constant and does not change regardless of location
Weight
Changes depending on the gravitational pull
Amount- quantifiable (number attached to it)

5. 1 Kg
1 Kg
Weight
Earth
Moon

6. Scientific Method
-Systematic approach used to solve a problem -Models are often used—visual representation of a system that can be modified, changed or explained
The main steps:
Observations
Hypothesis
Experiments
Data/Results
Analysis
Conclusions
Don’t always have to go in order

7. Observation vs. Inferences
Observation The act of gathering information based on your senses Inference A reasonable conclusion based on an observation and prior knowledge

8. Types of Observations Qualitative data
—describes physical characteristics, based on senses; qualities Color, odor, shape —numerical information obtained from measurements How much, how little, how big, how fast
Quantitative data

9. Identify the following as qualitative or quantitative observations
Rotten odor
12.4 feet
Boiling point of 85°C
Appears cloudy
Purple
5 leaves
3.70 seconds
square

10. Hypotheses
A tentative explanation for a set of observations If _____ then ______.

11. Experiment
A method to test a hypothesis

12. Constant or unchanging
Variables
Independent
Dependent
Control
manipulated variable; the variable that you change during the experiment
responding variable; the variable that is measured during the experiment
Constant or unchanging

13. Dependent
Responding
Y-axis
Manipulated
Independent
X-axis
“DRY MIX”

14. Hydrangeas
First step of sci method? Observation
What do you observe?

15. Lower the pH by adding aluminum to the soil
Raise the pH by adding phosphorus in the soil
A scientist wants to investigate the effect of different amounts of acid on hydrangeas. She decreases the hydrogen and increases the hydrogen to each plant. She observed the color of the plants.
water

16. Data/Results
Collecting and recording any qualitative/quantitative observations and measurements that are made during the experiment Often presented in the form of graphs, tables, charts

17. Analysis
Describing patterns and trends using your data, written report of your results

18. Conclusion Interpretation of the results Accept or reject hypothesis
Do your results make sense? Why and how do you know
Identify sources of error
Suggestions for further experimentation

19. Scientific Law Scientific Theory -the “what”
-A concise written or mathematical statement (explanation) of a relationship between phenomena that is always the same under the same conditions
-predicts the results of certain initial conditions
Replicable!!!
Scientific Theory
-the “why”
-tries to provide the most logical explanation about why things happen the way they do; based on data that is supported by many experiments
can think of any theories and laws?
what are they and explain (write down names)
How are the two different