Chemistry and chemicals
What is Chemistry?
study of composition, structure, properties, and reaction of matter
What is a measured number?
numbers obtained when you measure a quantity
ex; height, weight, temp
Basic conversions for length?
1km=?m
1m=?mm
1cm=?mm
1km=1000m
1m=1000mm
1cm=10mm
How do you calculate density?
density= mass of substance/ volume of substance
Physical properties
shape, color, melting point, physical state of substance
What are Chemicals?
substance that always had the same composition and properties.
What are significant figures?
All numbers including the estimated numbers
Basic conversions for volume?
1L=?mL
1dL=?mL
1mL=?cm^3
1L=1000mL
1dL= 100mL
1mL= 1cm^3
What is matter?
anything that has mass and occupies space
chemical properties
original substance converted into one or more new substances
What are the four parts of the scientific method?
1) observation
2) hypothesis
3) experiment
4) conclusion/Theory
How many significant figures are there in this number? 1.00460
5
Basic conversions for mass?
1kg=?g
1g=?mg
1mg=?mcg
1kg=1000g
1g=1000mg
1mg=1000mcg
what is a pure substance?
mater that has a fixed of definite composition
freezing point and boiling point in Celsius?
freezing; (o degrees celsius)
boiling; (100 degrees celsius)
How do you find the percentage of something?
part divide by whole X 100%
How do you know when you should count 0s when counting significant numbers?
when they're in between two nonzero numbers
when the zero is at the end of the decimal point
when a zero is in the coefficient of a scientific notation number
When multiplying and dividing numbers how do you know how many sig. figs to round to?
In multiplication or division, the final answer is written so that it has the same number of SFs as the measurement with the fewest SFs.
what is a compound?
It is a pure substance but contains atoms of two or more elements. Two or more substances are physically mixed.
What is the freezing point and boiling point in Kelvins?
freezing; 273K
boiling; 373K
When making scientific notation numbers if you move the decimal to the left is the notation positive or negative?
positive
what is the metric and SI unit for the following?
1) volume
2) length
3) mass
4) temperature
5) time
1) liter (L); cubic meter (m^3)
2)meter (m); meter (m)
3) gram(g); kilogram(kg)
4) degree Celcius; kelvin (K)
5) second (s); second (s)
When adding or subtraction how do you know how many SFs to round to?
In addition or subtraction, the final answer is written so that it has the same number of decimal places as the measurement with the fewest decimal places.
Difference between homogeneous and heterogenous
Homogeneous; atoms are mixed and we can not see each part individually
Heterogenous; mixed mixture but we can see each individual part
difference between Kinetic and potential Energy?
kinetic; the energy of motion, anything moving
potential; position of object or by chemical composition of a substance- not moving