2022 Chemistry Semester 1 Exam Study Guide: Ch. 1

chemistry

study of matter and the changes it undergoes

substance

matter that has definite and uniform composition. Anything that is pure is this

mass

measurement that reflects how much matter you have

matter

does not need a microscope to observe it. What we observe about it depends on the atoms and the changes they undergo

qualitative data

data that relates to the five senses

quantitative data

numerical data

scientific method

systematic approach used in scientific study

independent variable

variable you plan to change

dependent variable

variable whose value changes in response to a change in the independent variable

control

a standard for comparison

model

visual, verbal, or mathematical explanation of experimental data

theory

explanation of a natural phenomenon based on many observations and investigations over time

scientific law

a relationship in nature that is supported by many experiments

explain why chemistry is important

chemistry is the study of matter and matter is in everything

what are the steps of the scientific method in order?

observation, hypothesis, experiments, conclusions, and theory or scientific law

examples of qualitative data

taste, color, smell, sound, feeling, shape...

examples of quantitative data

height, weight, mass, population, temperature, speed, length...