8th Grade First Semester Mid-term Exam

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  • 1/85 Questions

    What is hydrophobic?

    • When a molecule repels water
    • When a molecule is attracted to water
    • When a molecule is a micelle
    • When a molecule is ionically bonded
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About This Quiz

8th Grade First Semester Mid-term Exam - Quiz

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  • 2. 
    Identify the property of water that allows a water strider insect to walk on the water. - ProProfs

    Identify the property of water that allows a water strider insect to walk on the water.

    • Surface Tension

    • Polarity

    • Capillary Action

    • Specific Heat

    Correct Answer
    A. Surface Tension
  • 3. 

    What is an atom?

    • The smallest part of an element that is a basic unit of matter

    • The unit measure of an element

    • Elements that make up molecules

    • Neutrons in the nucleus

    Correct Answer
    A. The smallest part of an element that is a basic unit of matter
  • 4. 
    Celery test: What property of water does the celery test model? - ProProfs

    Celery test: What property of water does the celery test model?

    • Capillary Action

    • Polarity

    • Surface Tension

    • Specific Heat

    Correct Answer
    A. Capillary Action
  • 5. 

    Floating Paper Clip:Why does adding liquid detergent to the water change how the paper clip floats?

    • It breaks the polarity and therefore the surface tension

    • Liquid detergent is not soluble

    • It changes the pH

    • It changes the specific heat

    Correct Answer
    A. It breaks the polarity and therefore the surface tension
  • 6. 

    Choose the terms that best complete the statement:Identify an atom's major subatomic particle charges:

    • Protons (+) positive, Neutrons are neutral, electrons (-) negative

    • Protons are neutral, neutrons are the nucleus, electrons (-) negative

    • Protons (-) negative, neutrons (+) positive, electrons (-) negative

    • Protons (+) positive, neutrons (-) negative, electrons are neutral

    Correct Answer
    A. Protons (+) positive, Neutrons are neutral, electrons (-) negative
  • 7. 
    Identify the property of water represented in this diagram: - ProProfs

    Identify the property of water represented in this diagram:

    • Capillary Action

    • Polarity

    • Universal solvency

    • Surface tension

    Correct Answer
    A. Capillary Action
  • 8. 

    Identify: At the surface of a liquid, when water molecules absorb enough energy to change to a gas, the water molecules______________

    • Evaporate

    • Condense

    • Liquify

    • Solidify

    Correct Answer
    A. Evaporate
  • 9. 

    What one notices or senses while performing the activity.

    • Data

    • Procedure

    • Observation

    • Control

    Correct Answer
    A. Observation
  • 10. 
    Identify the letter of the Hydrologic Cycle given in this question.Letter F is _________________  - ProProfs

    Identify the letter of the Hydrologic Cycle given in this question.Letter F is _________________ 

    • Streamflow

    • Groundwater discharge

    • Snowmelt runoff to streams

    • Water storage in oceans

    • Water storage in the atmosphere

    • Condensation

    • Evaporation

    • Sublimation

    • Evapotranspiration

    • Surface Runoff

    • Precipitation

    • Water storage in ice and snow

    • Infiltration

    • Groundwater storage

    • Spring

    • Freshwater storage

    Correct Answer
    A. Groundwater storage
  • 11. 

    Water is a universal solvent because:

    • Water is polar and can dissolve more substances than any other liquid

    • Solutes are not polar molecules

    • Water is made up hydrogen and oxygen atoms

    • Water has a neutral pH

    Correct Answer
    A. Water is polar and can dissolve more substances than any other liquid
  • 12. 

    What is a valence electron?

    • Ionically bonded electrons

    • Electrons in the outer most cloud of an atom

    • A negatively charge ion

    • A positively charge ion

    Correct Answer
    A. Electrons in the outer most cloud of an atom
  • 13. 
     This diagram represents H2.  What does the H2 symbol mean? - ProProfs

     This diagram represents H2.  What does the H2 symbol mean?

    • The H2 symbol represents two atoms of Hydrogen.

    • The H2 symbol represents a Hydrogen atom.

    • The H2 symbol represents a water molecule.

    • The H2 symbol represents an ionic bond.

    Correct Answer
    A. The H2 symbol represents two atoms of Hydrogen.
  • 14. 

    Identify which property of water allows water to move against gravity.

    • Capillary Action allows water to move against gravity.

    • Surface tension allows water to move against gravity.

    • Cohesion allows water to move against gravity.

    • Universal solvency allows water to move against gravity.

    Correct Answer
    A. Capillary Action allows water to move against gravity.
  • 15. 
    In the pile or water lab:What is the key factor in determining what kind of container of water can hold the most pennies before spilling over? - ProProfs

    In the pile or water lab:What is the key factor in determining what kind of container of water can hold the most pennies before spilling over?

    • The size of the container aperture (opening)

    • The mass of the container

    • The volume of water the container holds

    • The weight of the pennies

    Correct Answer
    A. The size of the container aperture (opening)
  • 16. 

    A compound is different from an element because a compound is: 

    • Made of two or more elements chemically combined.

    • The building block of all matter.

    • A mixture of elements.

    • A pure substance.

    Correct Answer
    A. Made of two or more elements chemically combined.
  • 17. 
    Why do hydrogen atoms usually exist as molecules, H2? - ProProfs

    Why do hydrogen atoms usually exist as molecules, H2?

    • Hydrogen has an atomic number of one and is unsatisfied when the outermost orbital is unfilled. A hydrogen molecule of two hydrogen atoms is more stable than two individual hydrogen atoms

    • Hydrogen has an atomic number of two and does not need to share

    • Hydrogen usually combines with other atoms to form covalent bonds

    • Hydrogen has one proton and is in search of one neutron

    Correct Answer
    A. Hydrogen has an atomic number of one and is unsatisfied when the outermost orbital is unfilled. A hydrogen molecule of two hydrogen atoms is more stable than two individual hydrogen atoms
  • 18. 

    In testing, measurements are:

    • Controls

    • Observations

    • Variables

    • Data

    Correct Answer
    A. Data
  • 19. 

    A summary of the relationship between the hypothesis and the test results.

    • Theory

    • Hypothesis

    • Conclusion

    • Data

    Correct Answer
    A. Conclusion
  • 20. 

    What forms when one substance dissolves another?

    • Solution

    • Solvent

    • Dissolution

    • Solute

    Correct Answer
    A. Solution
  • 21. 

     Why do hydrogen atoms usually exist as molecules, H2?

    • Hydrogen has an atomic number of one and is unsatisfied when the outermost orbital is unfilled. A hydrogen molecule of two hydrogen atoms is more stable than two individual hydrogen atoms

    • Hydrogen has an atomic number of two and does not need to share

    • Hydrogen usually combines with other atoms to form covalent bonds

    • Hydrogen has one proton and is in search of one neutron

    Correct Answer
    A. Hydrogen has an atomic number of one and is unsatisfied when the outermost orbital is unfilled. A hydrogen molecule of two hydrogen atoms is more stable than two individual hydrogen atoms
  • 22. 

    What is an emulsion?

    • A mixture of liquids that do not dissolve in each other. One liquid is suspended within the other liquid.

    • When one liquid repels another and is neutral.

    • When a solute dissolves in a solvent.

    • When a liquid solidifies.

    Correct Answer
    A. A mixture of liquids that do not dissolve in each other. One liquid is suspended within the other liquid.
  • 23. 

    What property of water helps regulate the rate at which air changes temperature?

    • Specific heat

    • Evaporation

    • Condensation

    • Specific gravity

    Correct Answer
    A. Specific heat
  • 24. 

    How are covalent and ionic bonds different?

    • Covalent bonds share electrons in the valence. Ionic bonds are formed when one atom loses an electron and it becomes a positive ion and the atom that gains the electron becomes a negatively charged ion because it has gained an electron.

    • Covalent bonds are formed when one atom loses an electron and it becomes a positive ion and the atom that gains the electron becomes a negatively charged ion because it has gained an electron. Ionic bonds share electrons in the valence.

    • Covalent bonds have a neutral electronegativity. Ionic bonds create anions.

    • Covalent bonds make new elements. Ionic bonds create cations and anions.

    Correct Answer
    A. Covalent bonds share electrons in the valence. Ionic bonds are formed when one atom loses an electron and it becomes a positive ion and the atom that gains the electron becomes a negatively charged ion because it has gained an electron.
  • 25. 

    A suggested solution to a problem question.

    • Theory

    • Hypothesis

    • Conclusion

    • Data

    Correct Answer
    A. Hypothesis
  • 26. 
    Look over the Hydrologic Cycle diagram. Identify: the name of the discharge of water to the atmosphere by land and plants: ____________________ - ProProfs

    Look over the Hydrologic Cycle diagram. Identify: the name of the discharge of water to the atmosphere by land and plants: ____________________

    • Evapotranspiration

    • Precipitation

    • Condensation

    • Evaporation

    Correct Answer
    A. Evapotranspiration
  • 27. 

    What is adhesion?

    • Waters ability to stick to other materials

    • Waters ability to stick to itself

    • Covalent bonds in water

    • Capillary Action

    Correct Answer
    A. Waters ability to stick to other materials
  • 28. 

    Identify: a substance that is being dissolved is a _________________

    • Solute

    • Solution

    • Solvent

    • Insoluble

    Correct Answer
    A. Solute
  • 29. 
    Pepper and Soap Lab:Why did the pepper move to the sides of the Petri dish when the soap drop entered the water? - ProProfs

    Pepper and Soap Lab:Why did the pepper move to the sides of the Petri dish when the soap drop entered the water?

    • Where the soap enters the water it breaks the surface tension, causing the pepper to move to the sides of the dish where the surface tension is still strong enough to keep it afloat.

    • Where the soap enters the water the pepper scatters to avoid the soap micelles from surrounding it.

    • Pepper is hydrophilic, when the soap enters the water the pepper spreads out to stay attached to the water, repelling the soap.

    • Where the soap enters the water it breaks the adhesion between the pepper and the water causing the pepper to move to the sides of the dish where it can reattach to the water and float.

    Correct Answer
    A. Where the soap enters the water it breaks the surface tension, causing the pepper to move to the sides of the dish where the surface tension is still strong enough to keep it afloat.
  • 30. 

    Which property is responsible for allowing water (and its dissolved substances) to move through the roots of plants and through the tiny blood vessels in our bodies?

    • Polarity

    • Surface tension

    • Universal solvency

    • Capillary Action

    Correct Answer
    A. Capillary Action
  • 31. 

    Ionic bonding allows atoms to have complete outer shells by: 

    • Ionic bonding allow atoms to have complete outer shells by transferring electrons. Ionic bonding is when one or more electrons are removed from one atom and gained and attached to another atom. This results in positive and negative ions that attract each other.

    • Ionic bonding allow atoms to have complete outer shells by sharing electrons. Ionic bonding is when one or more electrons are shared from one atom with another atom. This results in a shared valence.

    • Ionic bonding is a chemical compound formed by the joining of two or more atoms.

    • An ionic bond forms a stable compound through the sharing and transfer of valence electrons.

    Correct Answer
    A. Ionic bonding allow atoms to have complete outer shells by transferring electrons. Ionic bonding is when one or more electrons are removed from one atom and gained and attached to another atom. This results in positive and negative ions that attract each other.
  • 32. 

    The term ____________ is applied to any substance that cannot be made simpler without changing its chemical make-up.

    • Element

    • Atom

    • Molecule

    • Substance

    Correct Answer
    A. Element
  • 33. 

    A substance that dissolves another substance is called a ____________?

    • Solvent

    • Solution

    • Dissolution

    • Solute

    Correct Answer
    A. Solvent
  • 34. 
    Identify the water property represented in this diagram:(Too zoom the image, either double tap or use 2 fingers spread to zoom) - ProProfs

    Identify the water property represented in this diagram:(Too zoom the image, either double tap or use 2 fingers spread to zoom)

    • Polarity

    • Specific heat

    • Universal solvency

    • Surface tension

    Correct Answer
    A. Polarity
  • 35. 

    What is an ion?

    • An negatively charged particle (atom or molecule).

    • The electrically charged particles of Ca2+, Mg2+ presence in water.

    • An electrically charged particle (atom or molecule) whose charge is determined by the loss or gain of electrons.

    • An electrically charged particle (atom or molecule) whose charge is determined by the sharing of electrons.

    Correct Answer
    A. An electrically charged particle (atom or molecule) whose charge is determined by the loss or gain of electrons.
  • 36. 

    The atoms of each element have a unique number of protons in their nuclei.This unique number of protons is called the: 

    • Atomic number

    • Atomic mass

    • Subatomic particles

    • Nucleus

    Correct Answer
    A. Atomic number
  • 37. 

    What is matter?

    • Matter has mass, takes up space and can exist as a solid, liquid or gas.

    • Matter is made up of atoms and has weight.

    • Matter is made up of elements and has weight.

    • Matter has weight, takes up space and can exist as a solid and liquid only.

    Correct Answer
    A. Matter has mass, takes up space and can exist as a solid, liquid or gas.
  • 38. 

    What is wicking?

    • A material that pulls moisture through by capillary action

    • Adhesion of water

    • Cohesion of water

    • Capillary Action of water

    Correct Answer
    A. A material that pulls moisture through by capillary action
  • 39. 

    What is the difference between a compound and a mixture?

    • A compound is a pure substance made up of two or more elements that are combined chemically in a specific ratio. A mixture is two or more substances that are in the same place and are not chemically combined.

    • A mixture is a pure substance made up of two or more elements that are combined chemically in a specific ratio. A compound is two or more substances that are in the same place and are not chemically combined.

    • A compound is a mixture made up of two or more elements that are chemically combined. A mixture is a combination of two or more substances that occupy the same place.

    • A compound is set of element that are blended but not chemically combined. A mixture is made up of emulsifiers.

    Correct Answer
    A. A compound is a pure substance made up of two or more elements that are combined chemically in a specific ratio. A mixture is two or more substances that are in the same place and are not chemically combined.
  • 40. 

    The procedure to test an idea.

    • Theory

    • Process

    • Experiment

    • Control

    Correct Answer
    A. Experiment
  • 41. 
    You Can't Fix What Won't Mix:What causes the food coloring to behave as it does when it is dropped into the graduated cylinder of oil and water?  - ProProfs

    You Can't Fix What Won't Mix:What causes the food coloring to behave as it does when it is dropped into the graduated cylinder of oil and water? 

    • Since oil is less dense than water, the oil sits on top of the water. When it's dropped into the cylinder and hits the oil first, the food coloring forms a tight bead because it does not want to mix with the oil. Because the food coloring is water based, it is more dense than the oil and slowly sinks through it. When it reaches the intersection of the oil and water it sinks through and then the bead of food coloring bursts apart dissolving in the water.

    • Since oil is more dense than water, the water sits on top of the oil. When it's dropped into the cylinder and hits the water first, the food coloring forms a tight bead because it does not want to mix with it. Because the food coloring is oil based, it is more dense than the water and slowly sinks through it. When it reaches the intersection of the oil and water it sinks through and then bursts apart.

    • The food coloring is oil based and floats through the water to reach the oil.

    • The food coloring is more dense than the oil and the water and floats through the oil to reach the water. When the food coloring reaches the water it absorbs it.

    Correct Answer
    A. Since oil is less dense than water, the oil sits on top of the water. When it's dropped into the cylinder and hits the oil first, the food coloring forms a tight bead because it does not want to mix with the oil. Because the food coloring is water based, it is more dense than the oil and slowly sinks through it. When it reaches the intersection of the oil and water it sinks through and then the bead of food coloring bursts apart dissolving in the water.
  • 42. 

    Which response best states why water is considered a polar molecule? 

    • In a water molecule, the atom of Oxygen has a slight negative charge (-), each atom of Hydrogen has a slight positive charge (+). A molecule of water has oppositely charged ends.

    • In a water molecule, the atom of Oxygen has a slight positive charge (+), each atom of Hydrogen has a slight negative charge (-). A molecule of water has oppositely charged ends.

    • In a water molecule, the atom of Oxygen has a neutral charge, each atom of Hydrogen has one each of a positive ( +) and (-) negative charge. A molecule of water has oppositely charged ends.

    Correct Answer
    A. In a water molecule, the atom of Oxygen has a slight negative charge (-), each atom of Hydrogen has a slight positive charge (+). A molecule of water has oppositely charged ends.
  • 43. 

    Identify the property of water that explains why water forms drops.

    • Cohesion causes surface tension

    • Polarity

    • Capillary action

    • Specific heat

    Correct Answer
    A. Cohesion causes surface tension
  • 44. 

    What property of water makes it vulnerable to pollution?

    • Universal solvent

    • Polarity

    • Surface Tension

    • Capillary Action

    Correct Answer
    A. Universal solvent
  • 45. 

    What makes valence electrons different from other electrons?

    • Being in the outer shell, valance electrons can be shared or transferred (removed from or attached to) other atoms.

    • Being in one of an atom's core shells, valance electrons are shared or transferred (removed from or attached to) within an atom.

    • A valence electron is ionic and can be a cation or an anion.

    • A valence electron determines the electronegativity of an atom.

    Correct Answer
    A. Being in the outer shell, valance electrons can be shared or transferred (removed from or attached to) other atoms.
  • 46. 

    What is electronegativity?

    • How many electrons are in a valence.

    • The strength of an atoms' electrons.

    • The electrical charge of a polar molecule.

    • The exchange of electrons in ionic bonding.

    Correct Answer
    A. The strength of an atoms' electrons.
  • 47. 
    Identify this chain: - ProProfs

    Identify this chain:

    • This is a hydrocarbon chain of a soap molecule.

    • This is a food molecule chain.

    • This is an oxygen, hydrogen and carbon water molecule chain.

    • This is a soap molecule chain with sodium.

    Correct Answer
    A. This is a hydrocarbon chain of a soap molecule.
  • 48. 
    Waters high specific heat has a great deal to do with regulating extremes in the environment.How does water's specific heat capacity help the fish in the pond? - ProProfs

    Waters high specific heat has a great deal to do with regulating extremes in the environment.How does water's specific heat capacity help the fish in the pond?

    • Fish in this pond can live comfortably because the pond water specific heat capacity means the temperature of the water will stay relatively the same from day to night. The environment is relatively stable.

    • Fish in this pond can live comfortably because the pond water specific heat capacity means the temperature of the water will stay relatively warm from day to night. The environment is relatively stable.

    • Fish in this pond can live comfortably because the pond water specific heat capacity means the temperature of the water will stay relatively cool from day to night. The environment is relatively stable.

    • Fish in this pond can live comfortably because the pond water specific heat capacity means the density of the water will stay relatively the same from day to night. The environment is relatively stable.

    Correct Answer
    A. Fish in this pond can live comfortably because the pond water specific heat capacity means the temperature of the water will stay relatively the same from day to night. The environment is relatively stable.
  • 49. 

    Identify the statement that is correct about the number of protons and electrons in an atom:

    • The number of protons and the number of electrons in an atom are always equal.

    • The number of protons is always greater than the number of electrons in an atom.

    • The number of protons is always less than the number of electrons in an atom.

    • The number of protons and electrons equals the mass of an atom.

    Correct Answer
    A. The number of protons and the number of electrons in an atom are always equal.

Quiz Review Timeline (Updated): Mar 21, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 09, 2014
    Quiz Created by
    Rhaveno
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