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APChem: Chapter 1

QuestionAnswer
When an electric current passes through [water, it] is decomposed into what? hydrogen and water
These chemical elements themselves exist naturally as diatomic (two - atom) molecules and they make up the molecule of water. What are they? the oxygen and hydrogen molecule
What is the process that lies at the center of the scientific inquiry [finding out how to solve a problem] is called what? the scientific method
1 oxygen atom + 2 hydrogen atoms = ? 1 water molecule
1 oxygen molecule --- written as ? O2
1 _______ molecule --- written as H2 hydrogen
How many fundamental concepts of chemistry are there? 2
What is the first fundamental concept of chemistry? matter is composed of various types of atoms
What is the second fundamental concept of chemistry? one substance changes to another by reorganizing the way the atoms are attached to each other
You use what when making a prediction? the scientific emthod
What is the first step in the scientific method? making observations (collecting data)
What is the second step in the scientific method? suggest a possible explanation (forming a hypothesis)
What is the third step in the scientific method? doing the experiment to test the possible explanation (testing the hypothesis)
What is this formula? 2H2O(l) → O2(g) + 2H2(g) the decomposition of water
Observations may be what? qualitative or quantitiative
What is an example of a qualitative observation? the sky is blue
What is an example of a quantitative observation? a chemistry book weighs 2kg
What is a qualitative observation? it does not involve a number
A quantitative observation is also called what? a measurement
What is a quantitative observation? it involves both a number and a unit
What is considered a measurement? a number and a unit together
What is a hypothesis? a possible explanation from an observation
What is an experiment used for? to carry out a tested hypothesis
Experiments always produce new ___________. observations
In the third step of the scientific method what do you do? you gather new information to decide if your hypothesis is valid or not
Created by: 4studystack!!!
 

 



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