1. Republic of the Philippines
CAVITE STATE UNIVERSITY
Bacoor Campus
Phase II, Soldier's Hills IV, Molino VI. City of Bacoor
A.Y. 2014-2015
1st
Long Exam in Chemistry
NAME: ___________________________________ DATE: ___________________
COURSE: _________________________________ SCORE: __________________
I. IDENTIFICA
TION. Identify what is being asked in each statement. Write your answer on the space provided.
(2 pts. each)
___________________1. It tells how close a measurement is to the true value of the quantity that is measured.
___________________2. It is concerned with the identification, separation and qualitative and quantitative
determination of composition of different substances
___________________3. The space occupied by matter.
___________________4. It is the simplest substance.
___________________5. A substance which can be built up and decomposed into 2 or more different substances.
___________________ 6. It referstoohow closelytwoormore measurementsof the same quantityagree withone another.
___________________7. It is a measure of the Earth's attraction for objects on or near it.
___________________8. It is known as the International System of Units.
___________________9. A shorthand method of writing numbers using a power of 10.
___________________10. It is characterized by a change in the phase or state of a substance.
___________________11. Deals with the reactions of the compounds of carbon.
___________________12. Result in the disappearance of substances and the formation of the new ones.
___________________13. Mixtures of two or more pure substances in variable proportions.
___________________14. Ability to do work.
___________________15. Branch of science that deals with matter, property, composition and structure.
II. Classify the
following as:
A) Physical or
chemical change. Write P if it is a physical change and C if it is a chemical change.
____________________1. pumping oil out of a well
____________________2. separation of components of oil by distillation
____________________3. burning gasoline
____________________4. flaring of gas from a well
____________________5. grinding up beef in a meat grinder
____________________6.digestion of the pork
____________________7. baking bread
____________________8. fermentation to produce beer
____________________9. smashing a car against a tree
____________________10. burning your chemistry book
B) Mixture,
Element or Compound. Write M if it is a mixture, E if element and C if compound.
________________1. iron nail ________________2. aluminum foil
2. ________________3. sand
________________4. seawater
________________5. pandesal
________________6. vinegar
________________7. soil
________________8. computer chips
________________9.shampoo
________________10. condensed milk
________________11. lead of a pencil
________________12. methane gas
________________13. fruit juice
________________14. rock salt
________________15.tablesugar
C) H
omogeneous or Heterogeneous. Write HM for homogeneous and HT for heterogeneous.
________________1. 80% ethyl alcohol
________________2. chocolate syrup
________________3. soy sauce
________________4. nuts in a chocolate bar
________________5. hollow blocks
________________6. root beer
________________7. air
________________8. ink of ballpen
________________9. concrete pillar
________________10.brass
III. A. Determine the number of significant figures.
_____1. 578 _____6. 4.8x102
_____2.0.0000230 _____7. 0.039
_____3. 8.0004 _____8. 59.00
_____4. 0.000000009 _____9. 2480
_ _____5. 249.000 _____10. 35.09
B. Express in scientific notation.
_________________1) 0. 0000965
_________________2) 4760000
_________________3)0.00000000029
_________________4) 1007000000
_________________5) 0.0382
C. Perform the indicated operation. Write the correct significant figures.
1. 6.35 + 4.1=________
2. 28.52 ÷ 3.6=________
3. 3.36 + 21.1=______
3. 4. 3550.0 + 0.03 + 12.8=______
IV. Solve the following: Show your solution.
1. A solid material has a density of 5g/ml. What is the volume in liters of 100g of the material?
2.. -40°F to °C, K
3. 120°C to °F, K
4. 13.25 cm to in m, km
5. Carbon tetrachloride,CCl4 wasapopular organic solvent until it was found to be toxic. How much
heat is required to raise the temperature of 10.35 g CCl4 from 32.1 °C to 56.4 °C. The specific heat of
CCl4 is 0.8565 J/g◦K.
6. What is the mass of 20.5 cm3
of coal that has a density of 2.0 g/cm3
?
