Ciencias

Key Final laboratory


How many meters are there in one kilometer? 1000 m
How many mm are there in a cm? 10 mm
How many Decameters are there in a kilometer? 100 Dm
Hoy many cm are there in a kilometer? 100000 cm
How many seconds are there in an hour? 3600 s
Change 180 km/hr to m/s 5 m/s

Change 500 gr/mL to Dg/HL 5000000 Dg/HL

Change 35m3 to cm335000000 cm3

Change 0.75 m3 to dm3 750 dm3

Change 30 m/sec to km/hr 108 Km/h


Convert 58 Kg into mg 58 000 000mg


How much is 120 m/sec in km/hr 432 km/h


Change 3 Hm to cm 30 000 cm


Change 50,000 cm3 to dm3 50 dm3

450 Km to Dm 45 000 Dm

1500 km/hr to m/min 25 000 m/min

4,500,000cm3 to m3 4.5 m3

20 kg tomg 20 000 000 mg

40°C to Kelvins 313 K

30 liters to DL 3 DL

80 cm to mm 800 mm

20 g/ml to mg/cl 200 000 mg/cl

8 years to seconds 10 512 000 s





Determine what part of the scientific method it discusses.
(Problem, Hypothesis, Experimental Design, Analysis of Data, Conclusion)


A spectroscope is devised. It is tested with different typesof light to see how different elements produce a different spectrum _____experimental design______________


In a cement mixture, used for the construction industry: Mixing the cement with garbage can decrease the amount of pollution and reduces production costs for the industry. __conclusion__________---------------------------------------------------------------------------------------------------------------------------Studies have shown that children that eat balanced meals are more likely to have better grades than children eating a lot of junk food.

State your hypothesis:(If..Then)_If children eat balanced meals then they may have better grades_

Dependent variable better grades

Independent variable eating balanced meals

Studies have shown thatchildren are more aggressive if they spend many hours playing with their videogames.
State your hypothesis:(If..Then)_____If children play many hours videogames then they may be more aggressive____

Dependent variable more aggressive behavior

Independent variable playing a lot of video games


My level of sleepiness increases as the hours pass during a day. Which is the independentvariable in this case? More hours during the day


Which of the following are physical changes?
a) baking a potato c) carving a wooden figure
b) freezing mercury d) dissolving sugar in water


Classify these as pure substance (elements or compounds) or Mixtures
a) silver PS element d) oxygen PS element
b) a pine tree mixture e) iced tea mixture
c) orangejuice mixture f) air mixture


A clear liquid in an open container is allowed to evaporate. After three days, a solid residue is left. Was the original liquid an element, compound or mixture? Explain. Mixture because part of it evaporated and part remained behind


Classify the following as physical or chemical change.
a) Bread is baked CH c) Milk spoils CH
b) Salt isdissolved in water P d) snowflake melts P

Say if the following are homogeneous or heterogeneous mixtures. Say if they are elements, compounds or mixtures.
a) spaguetti sauce Het Mix d) river water Het mix
b) glass Hom Mix e) cough syrup Hom mixt
c) table sugar comp f) nitrogen element

Classify each of the following as physical or chemical change
a) bending a piece of wireP
b) burning coal CH
c) cooking a steak CH
d) cutting grass P


What is the difference between a homogeneous and a heterogeneous mixture? HOMO you cannot see the diff phases

Describe in your own words the difference between a pure substance and a mixture.
Pure substance ALWAYS the same composition

How can you distinguish between an element and a compound?
Elements...