Intro to Chemistry Flashcards
Why do we study chemistry?
- Chem. affects all aspects of life and most natural events.
- Chem. helps explain natural world.
- Studying chem. makes you an informed citizen.
- Connects inanimate world (physics) to the living world (biology)
What is chemistry?
The study of composition (the makeup), structure, and properties of matter and the changes matter undergoes during chemical reactions.
What is matter?
Anything that has mass and takes up space.
What are some examples of matter?
A person, air, blood, a pencil, etc.
What are some examples of things that aren’t matter?
Heat, light, energy, etc.
What are the states of matter?
Solid, liquid, gas, (also plasma)
What measurement system is used in Science?
Metric system
Whats the base unit for mass?
gram (g)
Whats the base unit for volume?
Liter (l)
Whats the base unit for length?
Meter (m)
How do you change a metric system unit?
Multiply or divide by 10.
What is density?
The substance’s mass per unit of volume. The symbol most often used for density is ρ.
How to you calculate Density (g/Ml)?
Density (g/Ml) = mass (g) / volume (Ml)
hint: you can use triangle with mass on top.
What things describe chemisty?
Time, Energy, Temperature, Mole
What is time?
Duration of a process (seconds (s))
What is energy?
Capacity to do work. (Joule (J) or Calories (cal))
What is temperature?
Measure of kinetic energy in particles. (Celcius 0c or Kelvin 273k)
What is mole?
Substance that contains 6.02 * 10^23 particles. (mol)
The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.
What is the scientific method?
A logical systematic approach to the solution of a scientific problem.
What are the steps of the scientific method?
- Observation of nature (problem)
- Form a hypothesis ( a proposed explanation)
- Experiment and collection of Observations (IV, DV, constants, control)
- Writing conclusion (Summary of results explained)
- Developing theory (Well tested with Repeated trials for broad observations)
- Scientific law (More experiments leading to description of relationships without explanation)
What are the 2 relationships?
Direct and indirect
Whats a direct relationship?
The values increase together
Whats the inverse relationship?
The values negate each other.
What is the independent variable?
Variable changed
Whats the dependent variable?
Variable measured
Whats the controls (constants)?
Things that stay the same in the experiment.
Whats the control group (control)?
The normal IV/ standard not effected by IV
