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TEAS 7 Science TEAS 7 Science Practice Test 2 _____ is dependent not only on the tempe...

_____ is dependent not only on the temperature, but also on the amount of substance available.

A. Condensation

B. Deposition

C. Evaporation

D. Melting

Answer Explanation:

Unlike condensation, deposition, and melting, evaporation is dependent not only on the temperature, but also on the amount of a substance available.

Condensation is the change of a gas or vapor to a liquid. A change in the pressure and the temperature of a substance causes this change. The condensation point is the same as the boiling point of a substance. It is most noticeable when there is a large temperature difference between an object and the atmosphere. Condensation is also the opposite of evaporation.

Evaporation is the change of a liquid to a gas on the surface of a substance. This is not to be confused with boiling, which is a phase transition of an entire substance from a liquid to a gas. The evaporation point is the same as the freezing point of a substance. As the temperature increases, the rate of evaporation also increases. Evaporation depends not only on the temperature, but also on the amount of substance available.

Freezing is the change of a liquid to a solid. It occurs when the temperature drops below the freezing point. The amount of heat that has been removed from the substance allows the particles of the substance to draw closer together, and the material changes from a liquid to a solid. It is the opposite of melting.

Melting is the change of a solid into a liquid. For melting to occur, enough heat must be added to the substance. When this is done, the molecules move around more, and the particles are unable to hold together as tightly as they can in a solid. They break apart, and the solid becomes a liquid.

Sublimation is a solid changing into a gas. As a material sublimates, it does not pass through the liquid state. An example of sublimation is carbon dioxide, a gas, changing into dry ice, a solid. It is the reverse of deposition.

Deposition is a gas changing into a solid without going through the liquid phase. It is an uncommon phase change. An example is when it is extremely cold outside and the cold air comes in contact with a window. Ice will form on the window without going through the liquid state.

Therefore, the Correct Answer is C.

More Questions on TEAS 7 Science

  • Q #1: Which statement best represents Mendel’s experiments with garden peas?

    A. As a result, Mendel developed several theories that have since been disproved.

    B. Mendel realized he was on an incorrect track, which led him to other experimental media

    C. As a result, Mendel developed foundational conclusions that are still valued and followed today.

    D. Mendel collaborated with others interested in genetics to develop heredity guidelines we still use today

    Answer Explanation

    Mendel developed theories of genetics that scientists around the world use today.

    From experiments with garden peas, Mendel developed a simple set of rules that accurately predicted patterns of heredity. He discovered that plants either self-pollinate or cross-pollinate, when the pollen from one plant fertilizes the pistil of another plant. He also discovered that traits are either dominant or recessive. Dominant traits are expressed, and recessive traits are hidden.

    Mendel’s Theory of Heredity

    To explain his results, Mendel proposed a theory that has become the foundation of the science of genetics. The theory has five elements:

    • Parents do not transmit traits directly to their offspring. Rather, they pass on units of information called genes.
    • For each trait, an individual has two factors: one from each parent. If the two factors have the same information, the individual is homozygous for that trait. If the two factors are different, the individual is heterozygous for that trait. Each copy of a factor, or gene, is called an allele.
    • The alleles determine the physical appearance, or phenotype. The set of alleles an individual has is its genotype.
    • An individual receives one allele from each parent.
    • The presence of an allele does not guarantee that the trait will be expressed.

  • Q #2: Why did it take many years for the cell theory to be developed?

    A. Advancements in microscopy took place slowly.

    B. Cells were difficult to isolate for experimental analysis

    C. Researchers believed a cell formed from preexisting cells

    D. Scientists already proved that cells were essential for life.

    Answer Explanation

    Robert Hooke discovered the first cells in the mid-eighteenth century. The cell theory is a theory because it is supported by a significant number of experimental findings. The cell theory took many years to be developed because microscopes were not powerful enough to make such observations.

    This theory, or in-depth explanation, about cells consists of three parts:

    • All living things are composed of one or more cells.
    • Cells are alive and represent the basic unit of life.
    • All cells are produced from pre-existing cells.

     

  • Q #3: What structure plays a role in air conduction?

    A. Alveolus

    B. Capillary

    C. Lung

    D. Trachea

    Answer Explanation

    The primary function of the respiratory system is to provide oxygen to and remove carbon dioxide from the body. In addition to gas exchange, the respiratory system enables a person to breathe. Breathing, or inhalation, is essential to life. It is the mechanism that provides oxygen to the body. Without oxygen, cells are unable to perform their functions necessary to keep the body alive. The primary muscle of inspiration is the diaphragm. Known as the chest cavity, this dome shaped structure flattens when it contracts. The rib cage moves outward, allowing outside air to be drawn into the lungs. During relaxation, the diaphragm returns to its dome shape and the rib cage moves back to its natural position. This causes the chest cavity to push air out of the lungs.

    The respiratory system can be functionally divided into two parts:

    • Air-conducting portion: Air is delivered to the lungs. This region consists of the upper and lower respiratory tract—specifically, the larynx, trachea, bronchi, and bronchioles.
    • Gas exchange portion: Gas exchange takes place between the air and the blood. This portion includes the lungs, alveoli, and capillaries.

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