NOS chapter - Scientific Method
The type of variable that is changed by the scientist
Independent Variable
How does each element get assigned an atomic number?
It relates to the number of protons the element has in the nucleus of its atom
What is a 'period' on the periodic table?
a row
The periodic table organizes the chemical ________
elements
What are the 3 basic units of the metric system?
meter, liter, gram
How many constant variables should there be in an experiment?
As many as you can think of
A scanning tunnel telescope allows scientists to see:
Atoms
On most periodic tables, an element's key includes the element's chemical symbol, atomic number and its ?
atomic mass
What is a chemical bond?
a force that holds 2 or more atoms together
How many millimeters are in 1 meter?
1000
From the hypothesis, "If we compare Orbit, Ice Cubes, and Wrigley gums, then we predict that Orbit will have the most amount of sugar per serving," what is the dependent variable?
amount of sugar per serving
What are isotopes?
Atoms of the same element that have different numbers of neutrons
The most common element in the universe is:
Hydrogen
Electrons closest to the nucleus have the ____ energy
least
How many cL are there in 1 kL
100,000
What is the difference between qualitative and quantitative observations?
Qualitative - using words/senses to describe what is observed in an experiment
Quantitative - using numbers to describe what is observed in an experiment
How would a neutral atom become an ion that has a charge of 2+?
It loses 2 electrons
All metals are good _________ of thermal energy and electricity
conductors
What is a valence electron?
an outermost electron of an atom that participates in chemical bonding
Why does science use the metric system?
It is a standardized and universal unit of measurement
Give an example of a good testable question AND of a bad testable question
good - make sure it is measurable
bad - asks for opinion
Where do scientists believe electrons exist inside an atom?
Electron cloud
Many nonmetals are ______ at room temperature
gases
What is the chemical formula for Carbon Dioxide?
CO2
Arrange in order from biggest to largest:
36 g, 3812 cg, .04 kg
.04 kg, 3812 cg, 36 g