General Chemistry 1
LONG Quiz
NAME: __________________________________________ Grade 12- Davidic Scholars Date:______________
MULTIPLE CHOICE: Write the letter of the correct answer before the number.
____1. How could you separate mixture of sand and iron fillings?
A. Evaporation
B. Distillation
C. Filtration
D. Magnetism
____2. Which of the following is the correct order of getting salt from the mixture of sand and salt?
A. Dissolving in water – filtration-evaporation
B. Filtration-dissolving in water – evaporation
C. Evaporation-filtration – dissolving in water
D. Filtration – evaporation – dissolving in water
____3. Which of the following is an example of a physical property?
A. ability to rust
C. flammability
B. color
D. malleability
____4. How is sieving as a method of separating mixtures being described?
A. It involves strong winds to separate the heavier solid from the lighter materials.
B. It is done by heating the mixture to separate the components at different temperatures.
C. It is a way of separating a mixture of chemicals by letting the solvent creep to the substance to separate the
components.
D. It is done by using an instrument with a meshed or perforated bottom by shaking the instrument to separate
coarse materials from fine ones.
____5. Which is the CORRECT description of filtration?
A. It is the process of separating solid matter from a liquid, by heating the mixture.
B. It is the process of separating liquid matter from another liquid, by causing it to pass through the pores of the filter.
C. It is the process of separating solid matter from a liquid, by causing the liquid to pass through the pores of the filter.
D. It is the process of separating solid matter from another solid, by causing the solids pass through the pores of the
strainer.
____6. Which pair of substances may be separated through distillation?
A. Gravel and sand
C. Soil and water
B. Salt and sand
D. Water and alcohol
____7. Which of the following describes how decantation is applied BEST?
A. Solid-solid heterogeneous mixtures
B. Solid-liquid homogeneous mixtures
C. Liquid-liquid homogeneous mixtures
D. Solid-liquid or liquid-liquid heterogeneous mixtures
____8. Which of the following describes centrifugation?
A. It is used to separate oil and water.
B. It is used to speed up the settling of a solid.
C. It is used to separate solid from another solid.
D. It is used to separate immiscible and non-immiscible liquids.
____9. Which of the following sub-atomic particles is found outside the nucleus of an atom?
A. electron B. neutron C. positron D. proton
____10. Which of the following sub-atomic particles has a positive charge?
A. electron B. neutron C. positron D. proton
____11. Which of the following sub-atomic particles has no charge?
A. electron B. neutron C. positron D. proton
____12. What is referred to as the atoms of an element having the same atomic number but different mass number?
A. ions B. isotopes C. molecules D. particles
____13. What is called as an aggregate of two or more atoms in a definite arrangement held together by chemical
bonds?
A. compound B. element C. ion D. molecule
____14. What is referred to as an atom or group of atoms that has a net positive or negative charge?
A. compound B. element C. ion D. molecule
____15. What is a type of ion with a positive charge?
A. anion B. cation C. covalent D. ionic
____16. How can a neutral atom become a cation?
A. when it gains electrons
B. when it loses electrons
C. when it shares electrons
D. when it combines electrons with other atoms
_____17. Which of the following statements about compounds is FALSE?
A. It is made up of two or more different elements that are combined
chemically.
B. It is made up of two or more different elements that are combined
physically.
C. It is a distinct group of atoms held together by chemical bonds.
D. It is a pure substance
_____18. Which of the following gives the composition of the molecule, in terms of the actual number of atoms
present?
A. chemical formula
C. molecular formula
B. empirical formula
D. structural formula
_____19. Biyo class conducted a simple science activity where they used potassium
iodide. What is the chemical formula of this compound?
A. KI B. K2I C. KI2 D. K2I2
_____20. A science student read (NH4)2SO4 in a bottle. What is the name of this compound?
A. ammonium sulfate
C. di-ammonium sulfate
B. ammonium disulfate
D. di-ammonium disulfate
_____21. In a science experiment, Pepito noticed a bottle on top of the teacher’s demonstration table. Magnesium
chloride is written in the bottle. What is the formula of this compound?
A. MgCl B. Mg2Cl C. MgCl2 D. Mg2Cl2
_____22. Which of the following anions is polyatomic?
A. bromide B. iodide C. nitrite D. sulfide
_____23. Which of the following is an acid?
A. HNO2 B. H2O2 C. NaOH D. MgCl2
_____24. Which of the following is a base?
A. HNO2 B. H2O2 C. NaOH D. MgCl2
_____25. Myrna, a chemistry student, read a bottle of chemical which is written as Fe2S3. What is the systematic name
of this compound?
A. iron (II) sulfide (III)
C. iron (II) sulfide
B. iron (III) sulfide (II)
D. iron (III) sulfide
_____26. Einstein class was performing a science laboratory activity. The different teams combined calcium and
hydroxide. What is the name of the compound formed?
A. hydroxide calcium
C. hydrate calcium
B. calcium hydroxide
D. calcium hydrate
_____27. What is the CORRECT formula for the compound in item 26?
A. CaOH B. CaOH2 C. Ca(OH)2 D. Ca2(OH)2
_____28. If a substance has a molecular formula C8H10N4O2, what will be its empirical formula?
A. CHNO B. C9H7N3O C. C4H5N2O D. C2H6N2O
29-30. A molecule with a molecular weight of 180.18 g/mol is analyzed and found to contain 40.00% carbon, 6.72%
hydrogen and 53.28% oxygen. Find the empirical and molecular formula
At. Wt. C=12 H=1 O=16
The empirical formula of the molecule is ___________________
The molecular formula of the compound is __________________
Solution:
31-34. Different substances have different properties; density is one property that can be used to identify the substance.
Solve and complete the following table with 3 significant digits
Object
Mass (g)
Volume (mL)
Density (g/ml)
water
150 g
1 g/mL
stone
60 mL
7.8 g/mL
plastic
55 g
0.940 g/mL
wood
110 g
155 mL
Solution:
_____35. Which student has accuracy?
_____36. Which student has precision only?
_____37. Which student has accuracy and precision?
_____38. Which student has neither both accuracy and
precision?
39-48.
49. The element carbon exists in two primary forms: graphite and diamond. How many moles of carbon atoms is
4.72×1024 atoms of carbon? _______
Solution:
Write the answer for each expression using scientific notation with the appropriate number of significant figures.
50) 217 ÷ 903
51)
13.77 + 908.226 + 515
52)
0.00666 × 321
Complete the table below
53. Number of
proton
54. Number of
neutron
55. electronic
configuration
59-60. Write the name of the formula and draw the Lewis Dot Structure of
Name of the formula: chloramine
Lewis Dot Structure:
56. valence
NH2Cl
57. period
58. group