First Quarterly Examination For Science 7
.
- 1.
Give a reason why farmers need to know how acidic or basic the soil isbefore they plant their crop. (2 pts)
- 2.
List the nonmetals in order of increasing boiling point. (3 points)
- 3.
When it contains less solute than the maximum amount it can dissolve at a given temperature, it is called ______ solution.
- A.
Saturated
- B.
Unsaturated
- C.
Homogeneous
- D.
Concentrated
Correct Answer
B. Unsaturated -
- 4.
It has a small amount of dissolved solute in comparison to the amount of solvent.
- A.
Saturated solution
- B.
Concentrated solution
- C.
Dilute solution
- D.
Molarity
Correct Answer
C. Dilute solution -
- 5.
What kind of mixtures that has a uniform composition and appearance all throughout?
- A.
Heterogeneous mixture
- B.
Composite mixture
- C.
Homogenous mixture
- D.
Concrete mixture
Correct Answer
C. Homogenous mixture -
- 6.
A dye that changes into a specific color depending on whether it is placed in an acidic solution or in a basic one.
- A.
PH scale
- B.
Indicator
- C.
Sodium hydroxide
- D.
Acidicity
Correct Answer
B. Indicator -
- 7.
What property of metal that identify a metal based on its appearance
- A.
Luster
- B.
Ductile
- C.
Magnetic
- D.
Conduct electricity
Correct Answer
A. Luster -
- 8.
They are elements exhibiting properties that are intermediate to metals and nonmetals. What are they?
- A.
Oxides
- B.
Metals
- C.
Non metals
- D.
Metalloids
Correct Answer
D. Metalloids -
- 9.
An acidic mixture has a pH that is less than ____.
- A.
7
- B.
9
- C.
10
- D.
8
Correct Answer
A. 7 -
- 10.
These refer to the list of the different nutrients provided by the food product with their corresponding percentage share on the daily recommended dietary allowance.
- A.
Ingredients
- B.
Nutrition facts
- C.
Recipes
- D.
Procedures
Correct Answer
B. Nutrition facts -
- 11.
During boiling, the temperature of a __________ changes at the start then it becomes the same; while the temperature of a __________ is different at different times
- A.
Atom; element
- B.
Mixture;Substance
- C.
Substance; Mixture
- D.
Base; Acid
Correct Answer
C. Substance; Mixture -
- 12.
This refers the relative amounts of solute and solvent in a given volume of solution.
- A.
Solubility
- B.
Concentration
- C.
Molality
- D.
Solution
Correct Answer
B. Concentration -
- 13.
The component present in small amount in the solution.
- A.
Particle
- B.
Concentrates
- C.
Solvent
- D.
Solute
Correct Answer
D. Solute -
- 14.
Which of the following is a substance?
- A.
Ice candy
- B.
Nova snack
- C.
Distilled water
- D.
Ice cream
Correct Answer
C. Distilled water -
- 15.
The following are the characteristics of solution except:
- A.
It is a homogeneous mixture.
- B.
The solute cannot be separated from the solvent through filtration.
- C.
The solute can be separated by any means.
- D.
A solution is often clear and transparent.
Correct Answer
C. The solute can be separated by any means. -
- 16.
Which of the household products is a base?
- A.
Vinegar
- B.
Bleach
- C.
Milk
- D.
Rainwater
Correct Answer
B. Bleach -
- 17.
Acids and bases with high concentrations can cause _______.
- A.
Happiness
- B.
Sweetness
- C.
Serious burns
- D.
Good eye sight
Correct Answer
C. Serious burns -
- 18.
This refers to any compound of oxygen with another element or a radical.
- A.
Oxide
- B.
Halide
- C.
Halogen
- D.
Metal
Correct Answer
A. Oxide -
- 19.
In a compound Iron phyrophates, which element can be found to this compound aside from Iron and Oxygen?
- A.
Calcium
- B.
Sulfur
- C.
Phosphorus
- D.
Helium
Correct Answer
C. Phosphorus -
- 20.
The list of the materials that have been added to make the food product. These materials are the sources of the nutrients. These are the ones that are taken in by the body.
- A.
Nutrition Facts
- B.
Minerals
- C.
Menu
- D.
Ingredients
Correct Answer
D. Ingredients -
- 21.
During melting, a substance melts ________within a short time; while a mixture has portions that seem to be not _____.
- A.
Successfully; cooled
- B.
Completely; Melting
- C.
Temporarily;Melting
- D.
Successfully; Melting
Correct Answer
B. Completely; Melting -
- 22.
A substance formed by chemical union of two or more elements or ingredients in definite proportion by weight.
- A.
Element
- B.
Mixture
- C.
Acid
- D.
Compound
Correct Answer
D. Compound -
- 23.
Describe the above picture
- A.
Concentrated
- B.
Dilute
- C.
Saturated
- D.
Unsaturated
Correct Answer
A. Concentrated -
- 24.
The following are the examples of naturally occuring solution except;
- A.
Ocean
- B.
Wine
- C.
Air
- D.
Blood
Correct Answer
B. Wine -
- 25.
The solution that contains the maximum amount of solute dissolved by a given amount of solvent.
- A.
Unsaturated solution
- B.
Solvent
- C.
Solute
- D.
Saturated solution
Correct Answer
D. Saturated solution -
- 26.
A chemical decomposition reaction produced by passing an electric current through a solution containing ions.
- A.
Distillation
- B.
Electrolysis
- C.
Evaporation
- D.
Condensation
Correct Answer
B. Electrolysis -
- 27.
The property of metal that allows electricity to pass through a material.
- A.
Electrical conductivity
- B.
Ductile
- C.
Magnetic
- D.
Luster
Correct Answer
A. Electrical conductivity -
- 28.
The property of metal that can be hammered or rolled into thin sheets without breaking the metal.
- A.
Luster
- B.
Malleable
- C.
Ductile
- D.
Magnetic
Correct Answer
C. Ductile -
- 29.
Which of the following affect how fast a solid solute dissolves except?
- A.
Freezing
- B.
Stirring
- C.
Temperature
- D.
Particle size
Correct Answer
A. Freezing -
- 30.
The process of purifying a liquid by boiling it and condensing its vapors.
- A.
Distillation
- B.
Condensation
- C.
None of these
- D.
Evaporation
Correct Answer
A. Distillation -
- 31.
How many mL of ethyl alcohol are present in a 50 mL bottle of rubbing alcohol?
- A.
35 mL
- B.
40 mL
- C.
15 mL
- D.
20 mL
Correct Answer
A. 35 mL -
- 32.
A substance consisting of two or more substances mixed together.
- A.
Element
- B.
Compound
- C.
Mixture
- D.
Substance
Correct Answer
C. Mixture -
- 33.
Would it be possible to have a mixture made of all carbon atoms and compounds with only carbon atoms?
- A.
Yes
- B.
No
- C.
Maybe
- D.
No idea
Correct Answer
B. No -
- 34.
What are the elements found in water?
- A.
Calcium and Nitrogen
- B.
Carbon and Helium
- C.
Hydrogen and Carbon
- D.
Hydrogen and Oxygen
Correct Answer
D. Hydrogen and Oxygen -
- 35.
Who proposed the pH scale used to determine the acidity and basicity of the solution?
- A.
Soren Peter Lauritz Sorensen
- B.
Albert Einstein
- C.
Aristotle
- D.
Charles Darwin
Correct Answer
A. Soren Peter Lauritz Sorensen -
- 36.
You were tasked to check if the liquid sample you have is a substanceor a mixture. Which among these tests is the BEST way to do so?I. Color comparisonII. Taste comparisonIII. Boiling testIV. Melting test
- A.
I, II, III and IV
- B.
I, II and III only
- C.
I, II and IV only
- D.
III and IV only
Correct Answer
D. III and IV only -
- 37.
A liquid has the following properties: one-phase, colorless, boils atvarying temperature. Which of the following BEST describes theliquid?
- A.
Substance
- B.
Solution
- C.
Suspension
- D.
Coarse mixture
Correct Answer
B. Solution -
- 38.
Which of the following statements is TRUE?
- A.
Water is composed of more than two elements.
- B.
Compounds are more complex than elements.
- C.
Compounds are made up of one kind of element.
- D.
Ferrous sulfate cannot be broken down into simpler substances.
Correct Answer
B. Compounds are more complex than elements. -
- 39.
Which statement describes the solute?
- A.
It is the solid formed in solution.
- B.
It is the liquid part of the solution.
- C.
It is the component of a solution in smaller amount.
- D.
It is the component of a solution in bigger amount.
Correct Answer
C. It is the component of a solution in smaller amount. -
- 40.
Arrange the following household items: toothpaste, bath soap, tap water,vinegar from the most acidic to most basic?
- A.
Tap water, milk, toothpaste, vinegar
- B.
Milk, tap water, vinegar, toothpaste
- C.
Toothpaste, milk, tap water, vinegar
- D.
Vinegar, tap water, milk, toothpaste
Correct Answer
D. Vinegar, tap water, milk, toothpaste -
- 41.
Which of the following elements is most likely ductile at roomtemperature?
- A.
Sulfur
- B.
Mercury
- C.
Nitrogen
- D.
Aluminum
Correct Answer
D. Aluminum -
- 42.
Calcium chloride is a compound of the two elements calcium andchlorine. 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.
Correct Answer
B. The symbol for calcium chloride includes Ca and Cl -
- 43.
Which of the following is an example of a solution?
- A.
Vinegar
- B.
Ice cream
- C.
Mud in water
- D.
Oil mixed in soy sauce
Correct Answer
A. Vinegar -
- 44.
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
- A.
The mass is the same but the melting behavior is different.
- B.
The mass is different but the melting behavior is the same.
- C.
Its mass and melting behavior are the same.
- D.
Its mass and melting behavior are different.
Correct Answer
B. The mass is different but the melting behavior is the same. -
- 45.
Soap has a pH value of 8 to 9. What is it? Basic mixture
- A.
Acidic mixture
- B.
Dilute solution
- C.
Basic mixture
- D.
Concentrated solution
Correct Answer
C. Basic mixture -
- 46.
Which element is gaseous at room temperature?
- A.
Mercury
- B.
Nitrogen
- C.
Carbon
- D.
Calcium
Correct Answer
B. Nitrogen -
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