Summary
Summary Into to SI unit and measurement
- Course
- Institution
Summary Chemistry (high school)
[Show more]
Seller
Follow
sharonlok1028
Content preview
Chapter 1What is chemistry?
The science that deals with the materials of the universe and the changes these materials
undergo: e.g. substance gas + substance gas = NEW liquid substance
Understanding chemistry also helps to understanding other field like biology
Why is chemistry important?
Helps to make new materials e.g. glass, plastic
New pharmaceuticals; help with creating new drug by changing one's structure -> absorb
in certain part of body, or last longer -> very important
Make new energy sources
Food supplies -> change the texture of food, involve chemical how its intact in different
temp an change in overtime
Help the environment
Scientific Approach
1. Making a observation - recognize the problem and slate it clearly
e.g. colour, pH
2. Form a hypothesis - propose possible solution to the problem or a
guess
3. Perform an experiment - to prove the hypothesis is true by
preforming an experiment
E.g. Ice and water on the table -> seeing ice floating -> observation
hypothesis: because water is denser than ice -> hypothesis
Experiment: measure the mass and volume for both water and ice -> get density ->
prove your hypothesis
Theory: explain why its happen; have a set of tested hypotheses that
gives an overall explanation of some natural phenomenon
Law: what just happen -> explain in scientific -> e.g. gas law
Chapter 2
Measurement and Expression
- Uncertainty: When measuring something, there is a limit on it (depends on the item we are
using) -> a 15 cm ruler, anything after 15 cm is kind of a guess -> uncertainty regarding with that
number
- Measurement: what you observe; have a number and units
- Scientific notation: express a number as a product of a number between 1 and 10 and the
appropriate power of 10
o Moved to left -> positive number
Example: 93,000,000 -> 9.3 x 107
o Move to the right -> negative number
Example: 0.0671 -> 6.71 x 10-2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller sharonlok1028. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75323 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now