1. 6. The label of the 200-ml rubbing alcohol that Mrs. Santiago bought shows that it
contains 40% ethyl alcohol. What is the volume of ethyl alcohol does the rubbing
alcohol contain?
a. 10mL b. 50mL c. 60mL d. 80mL
7. Calculate the percentage concentration of :
2.5 grams of sodium bicarbonate in 95 grams solution
a. 2.63% b. 26.3% c. 0.26% d. 0.02%
8. Calculate the percentage concentration of :
50.0 grams of sugar in 75 grams solution
a. 0.66% b. 0.06% c. 6.66% d. 66.66%
9. Calculate the percentage concentration of :
30 mL hydrogen peroxide in 100 mL solution
a. 3% b. 30% c. 0.3% d. 0.33%
10. Calculate the percentage concentration of :
18 grams of salt in 98 grams solution
a. 16% b. 17% c. 18% d. 19%
Identifying and explaining the factors affecting solubility
1. Which of the following factors affecting solubility let the solvent particles come in contact
faster with the corners and edges of solute?
a. nature of solute b. particle size c. stirring d. temperature
2. Why people stir coffee or juice in water after they have added sugar?
a. Stirring allows faster spreading of solute particles in the solvent.
b. Stirring prevents the contact between the solute and solvent.
c. Stirring allows more solute particles to be dissolved.
d. Stirring makes the solution more homogeneous.
3. When a substance, such as sugar, dissolves in water, the particles intermingle. This is
possible because the particles of sugar ...
a. are pure. c. have spaces between them.
b. have strong attractions to each other. d. are vaporized.
4. Solubility is affected by a number of factors including all of the following, EXCEPT
a. temperature c. type of solute
b. agitation d. type of solvent
5.Dissolving occurs when a solute and a solvent are added together. The factors that
affect the rate of dissolving are ...

2. a. type of solute, type of solvent, temperature
b. agitated, temperature, size of pieces
c. temperature, concentration, solubility
d. type of agitation, temperature, type of solvent
6. The table shows the solubility of lead nitrate at different temperatures.
Solid 10 °C 30 ° C 50 °C 70 °C
Solubility per 100 g of water 44 g 61 g 79 g 98 g
As temperature increases the solubility of lead nitrate..
a. becomes zero b. decreases b. increases d. stays the same
7. In which solution will sugar dissolves fastest?
a. creamed coffee b. flavored coffee c. hot coffee d. iced coffee
8. Powdered sugar dissolves faster than a lump of sugar because:
a. The powdered sugar has larger particles.
b. The powdered sugar has smaller particles.
c. The powdered sugar has sharp edges.
d. The powdered sugar has big spaces.
9. Stirring will make solids dissolve:
a. faster b. more slowly c. greater in amount d. lesser in amount
10. What happens to the solubility of substances when temperature increases?
a. It will also increase. c. It will become zero.
b. It will decrease. d. It will stay the same.
Recognizing the properties of substances and mixtures
1. You were tasked to check if the liquid sample you have is a substance or a mixture.
Which among these tests is the BEST way to do so?
I. Color comparison III. Boiling point test
II. Taste comparison IV. Melting point test
a. I, II, III and IV c. I, II and IV only
b. I, II and III only d. I and III only
2. A liquid has the following properties: one-phase, colorless, boiling point of 95°C to
97°C. Which of the following BEST describes the liquid?
a. Solution b. Substance c. Suspension d. Coarse mixture
3. Jill has an unopened box of a 2-meter foil labeled 100% made of aluminum.
Aluminum is a substance. Jill takes just a thumb-size piece of the aluminum foil. Which
of the following statements is TRUE about the piece of aluminum foil that Jill took
compared with the rest that was left in the box?

3. a. Its mass and melting point are different.
b. Its mass and melting point are the same.
c. The mass is different but the melting point is the same.
d. The mass is the same but the melting point is different.
4. Dan was given three unknown liquid samples. His observations are written in the table
below.
Which of the samples are probably the SAME substance?
a. Liquids A and B may be the same substance.
b. Liquids B and C may be the same substance.
c. Liquids A and C may be the same substance.
d. All of the liquid samples may be the same substance
5. Given the following observations, which of the solid samples are probably the SAME
substance?
Sample Color Mass (g) Melting
Point (oC)
Density
(g/mL)
Solid 1 blue 5.0 150 2.3
Solid 2 blue 5.0 114 2.3
Solid 3 blue 2.5 150 2.3
Solid 4 blue 5.0 150 3.6
a. Solids 1 and 2 c. Solids 1 and 4
b. Solids 1 and 3 d. No samples are probably the same.
6. Suspensions are mixtures that _________ because the particle sizes are so large.
a. blend b. disappear c. mix d. settle
Sample Appearance Volume (mL) Boiling Point
(o
C)
Liquid A clear,
transparent
5.0 85
Liquid B clear,
transparent
2.8 85
Liquid C clear,
transparent
2.8 100

4. 7. Which method shown in the diagram removes excess liquid?
a. method 1 b. method 2 c. method 3 d. method 4
8. The following list contains all pure substances.
a. milk, water, copper c. tea, salt, concrete
b. gold, oxygen, nickel d. orange juice with pulp, silver, soda water
9. Sugar dissolved in water is classified as
a. homogeneous b. heterogeneous c. pure substance d. particle
10. Which of the following has properties always the same under given condition?
a. element b. compound c. mixture d. pure substance
Recognizing that compounds consist of specific elements
1. Which of the following statements is TRUE?
a. Ferrous sulfate cannot be broken down into simpler substances.
b. Compounds are made up of one kind of element.
c. Water is composed of more than two elements.
d. Compounds are more complex than elements.
2. Calcium chloride is a compound of the two elements calcium and chlorine. Which of
the following statements is TRUE?
a. Calcium chloride is listed in the periodic table.
b. The symbol for calcium chloride includes Ca and Cl.
c. Chlorine may still be broken down into a simpler form.
d. Calcium and chlorine belong to the same group in the periodic table.
3. When two or more elements join together chemically,
a. a compound is formed.
b. a mixture is formed.
c. a substance that is the same as the elements is formed.
d. the physical properties of the substances remain the same.
4. The physical properties of compounds do NOT include
a. melting point. B. density. C. reaction to light. d. color.
5. Which of the following will NOT break down compounds?
a. heat b. electric current c. chemical change d. filtering
6. How do elements join to form compounds?
a. randomly c. in a specific mass ratio
b. as the scientist plans it d. in a ratio of 1 to 8

5. 7. Compounds found in all living things include
a. proteins. b. ammonia. c. mercury oxides. D. carbonic acids.
8. How do the properties of a compound compare with the properties of the elements that
make up the compound?
a. Only the physical properties are the same.
b. Only the chemical properties are the same.
c. All the properties are identical.
d. The properties are different.
9. By what processes can compounds be broken down?
a. physical changes c. compound changes
b. chemical changes d. either physical or chemical changes
10. What kind of pure substance forms when two elements chemically combine?
a. an element b. a compound c. a mixture d. a solution
Gathering information about common elements such as names, symbols and
whether it is a metal or nonmetal from a Periodic table
1. It is a useful tool that contains the name, symbol, atomic number of each element.
a. Periodic table of elements c. Periodic table of mixtures
b. Periodic table of compounds d. Periodic table of solutions
2. Which of the following is the correct chemical symbol for Hydrogen?
a. H b. Hy c. Hg d. Hr
3. Which of the following is the correct chemical symbol for Carbon?
a. Ca b. Cr c. C d. Cb
4. Which of the following is the correct chemical symbol for Oxygen?
a. O b. Ox c. Oy d. On
5. Which of the following is the correct chemical symbol for Nitrogen?
a. N b. Ni c. Nr d. Ng
6.Which element derives its symbol from the Latin word, aurum, which means 'shining
dawn'? a. Americium b. Copper c. Gold d. Silver
7. Which element best characterizes an organic compound?
a. Carbon b. Hydrogen c. Nitrogen d. Oxygen
8. Which element is an example of a noble gas?
a. Chlorine b. Iridium c. Krypton d. Nitrogen
9.Which element has the Latin name Kalium?
a. Barium b. Lanthanum c. Potassium d. Sodium

6. 10. What do vertical columns in the periodic table called?
a. Atomic number b. Atomic mass c. Group d. Period
Recognizing the elements considered as metals and those that are nonmetals
1. Which of the following elements is most likely ductile at room temperature?
a. Sulfur b. Mercury c. Nitrogen d. Aluminum
2. An element was subjected into flame and the acidity of the oxide formed was tested.
Solution of this oxide turned red litmus paper to blue. Which is most likely that element?
a. Chlorine b. Nickel c. Phosphorus d. Silicon
For questions 3 to 5. Refer to the information below.
3. Which metal is liquid at room temperature? a. Cl b. He c. Hg d. Zn
4.Which nonmetal is liquid at room temperature? a. Al b. Br c. Fe d. S
5. Which nonmetal has the highest boiling point? a. He b. N c. O d. S
For items 6-8, identify the property of metal exhibited by each situation.
6. Many metals can be drawn into wires.
a. ductility b. elasticity c. magnetism d. malleability
7. Aluminum foil is use to wrap food.
a. conductivity b. ductility c. luster d. malleability
8. The property which allows electricity to pass through a material.
a. ductility b. electrical conductivity c. magnetism d. malleability
Element
Symbol
MP
(°C)
BP
(°C)
Electrical
conductivity
Al 660 2450 Good
Br -7 58 Poor
Ca 850 1490 Good
Cl -101 -35 Poor
Cu 1083 2600 Good
He -270 -269 Poor
Fe 1540 2900 Good
Pb 327 1750 Good
Mg 650 1110 Good
Hg -39 357 Good
N -210 -196 Poor
O -219 -183 Poor
P 44 280 Poor
K 64 760 Good
Na 98 890 Good
S 119 445 Poor
Zn 419 906 Good

7. 9. This property of metal allows them to be hammered into thin sheets.
a. ductility b. elasticity c. magnetism d. malleability
10. Which property of metal allows heat and electricity to transmit?
a. ductility b. electrical conductivity c. magnetism d. malleability
K to 12 Science
Grade 7 – Living Things and Their Environment
Second Quarter
Differentiating organ systems, organs, tissues, cells from each other
1.