Unit 1: What Is Chemistry? Flashcards
Define chemistry
The study of all substances and the changes (physical and chemical) that they undergo
Define chemical change and give an example
New substance is formed
Ex: combustion (burning, cellular respiration)
Define combustion
Chemical reaction between a hydrocarbon and oxygen
List the types of chemistry
1) organic
2) inorganic
3) analytical
4) physical
5) biochemical
Define organic chemistry
Study of substances containing carbon
Define inorganic chemistry
Study of substances without carbon
Define analytical chemistry
Study of the composition of substances
Define physical chemistry
Theories and experiments with chemical behavior
Define biochemical
Study of the chemical processes in living things
Define the scientific method
An orderly and systematic approach used to answer questions about the world around us
Steps of the scientific method
- Observations to find a question or purpose
- Form hypothesis
- Perform an experiment and analyze data
- Draw conclusions
- Communicate results, redo, and/or modify
The scientific method is a ____ process
Semi-linear
What does it mean that the scientific method is semi-linear?
The scientific method is step by step, but sometimes you have to go back to earlier steps and modify your experiment and do things again
What is the changed or manipulated variable in an experiment?
Independent variable
What is a list of directions that tests the hypothesis?
Procedure
What is the group in an experiment where there is no change, just normal conditions?
Control
What is a paragraph where data is studied carefully?
Analysis
What is the variable that depends on/results from the independent variable?
Dependent variable
Data is displayed in a:
Graph
Group in the procedure where there is a change
Experimental
Type of graph that displays data in a number of separate or distinct categories
Bar graph
Testable problem that can be proved or disproved
Question
_____ is used to solve scientific questions
Scientific method
Data is recorded in:
Data table
Type of graph that shows how the dependent variable changes in response to independent variable
Line graph
Predicted an answer to the question, an if-then statement
Hypothesis
What does SI stand for?
Systéme international
Define metrication
The process of changing a countries unit into metric units
The US officially adopted SI in:
1866
Visual observations are:
Qualitative
Numerical measurements are
Quantitative
When we measure, we use a measuring tool to compare some dimension of an object to a:
Standard
Length is measured in
Meter
Mass is measured in
Kilograms
Volume is measured in
Liters
Time is measured in
Seconds
Temperature is measured in
Celsius degrees or kelvins
What is mass?
Amount of matter (grams measured on a balance)
Weight?
Force exerted by the mass of an object, present with gravity (pounds measured with a scale)
