Matter Classification
What state of matter has definite volume and shape?
Solid
Is burning wood a chemical or physical change?
chemical
5.0 g of carbon is weighed on a scale.
These are the following values obtained:
6.2, 6.3, 6.4, 6.3, 6.2
This is precise not accurate!
1000
1 sig fig!
1 nanometer = meters
1*10^-9 meters
What state of matter has definite volume and no definite shape?
Dry ice turns into carbon dioxide gas.
Is this a chemical or physical change?
Systematic error is...
precise not accurate!
20.200
5 sig figs
l = 10 m
w = 20 m
h = 10 m
Its volume is how many km^3?
2*10^-6 km^3
What state of matter has no volume or shape?
Gas
Nitrogen gas and hydrogen gas combine to create ammonia gas. Is this a chemical or physical change?
Chemical change
10.0 mL is measured by multiple students.
10.1; 10.2; 10.0; 9.9; 10.0
Precise and accurate!
0.022 + 0.11
0.13; 2 sig figs
1000 mL = cm^3
1000 cm^3
What do you call a substance going from solid to gas?
Sublimation
What is the difference between a hypothesis and a theory?
A hypothesis is what we believe will happen.
A theory is a well tested hypothesis backed up by research and data.
Random error is...
neither accurate nor precise
1400*3.20
4500; 2 sig figs
3 days = ? seconds
259,200 seconds
What do you call a substance going from gas to liquid?
condensation
List the steps of the scientific method.
Observation
Formulating a Question
Hypothesis
Experimentation
Retesting
What is the difference between systematic and random error?
Systematic error is precise, random error is not.
(1.23 + 10.2)/30
0.4; 1 sig fig
154 * 10^20 pm = ? cm
1.54*10^12 cm