Chapter 1 & 2 Test Review Flashcards
Pure science is best defined as the _____.
Continuing search for new knowledge.
Technology can best be defined as ______.
Applied science
What do scientists who do pure science do?
They do experiments to find out about the world.
A scientific model is a _______.
Representation of a real event or object.
The first step in the scientific method is usually
Making an observation.
What does it mean to say that “no experiment is a failure”?
All experiments are observations of real events
Matter is defined as anything that
Has mass and takes up space.
The science of what matter is made of and how it changes is called _____.
Chemistry.
The smallest unit of a substance that behaves like the substance is _____.
An element.
You put 1 gram of salt into 1 liter of water and stir. The resulting liquid is an example of _____.
A homogenous mixture.
The chemical symbol for sulfuric acid is H^2SO^4. How many atoms are contained in each molecule of sulfuric?
7
The chemical formula for water, H^2O, means that each water molecule contains _____.
Two hydrogen atoms and one oxygen atom.
Which of the following is an example of a physical change?
Dissolving salt in water.
Digesting food is an example of _____.
Chemical change
How many significant figures are in the number:
2000
1
How many significant figures are in the number:
2000.
4
How many significant figures are in the number:
0.002
1
How many significant figures are in the number:
2.000
4
How many significant figures are in the number:
0.200
3
How many significant figures are in the number:
2002
4
How many significant figures are in the number:
20 x 10^2
1
Describe the relationship between science and technology, and give an example of how they are related.
Science is the study of objects and how they work. Technology is how we use that knowledge. You can use science to observe and test your experiment. You use technology to help figure out things in science.
What does it mean to say that “no experiment is a failure”? Do you agree or disagree? Why?
No experiment is a failure means that no experiment is p for nothing. I agree even if your experiment did not go as planned you are still learning something new.
Why are organizing and presenting data important scientific skills?
Organizing and presenting data are important skills because they show and prove what happen in the experiment. Data can be used to see if a hypothesis is correct or not.
“Carbonated drinks are homogenous mixtures.” Explain this statement.
Carbonated drinks are homogenous mixtures because they are the same throughout, they never change.
How can water be classified as both a pure substance and a heterogenous mixture at the same time. List an example of each.
If water is referred to as H2O, it is a pure substance because you know exactly whats in it. If water is just referred to as water it is heterogenous because it could be well water, city water, spring water, vitamin water and so on.
