Heat Is Added to a Substance at a Constant Rate

question 111

Multiple Choice

Heat is added to a substance at a constant rate. The substance starts as a solid and is melted; the liquid is heated and vaporized; finally, the vapor is heated. This process is shown in the graph. The latent heat of fusion can be found by

• A) multiplying the length of B in seconds) by the rate at which heat is added, and dividing by the mass of the substance.
• B) multiplying the length of D in seconds) by the rate at which heat is added, and dividing by the mass of the substance.
• C) multiplying the slope of A by the rate at which heat is added, and dividing by the mass of the substance.
• D) multiplying the slope of C by the rate at which heat is added, and dividing by the mass of the substance.
• E) multiplying the slope of E by the rate at which heat is added, and dividing by the mass of the substance.

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Definitions:

Fertilisation

The process by which male and female reproductive cells (gametes) unite, leading to the development of a new organism.

Embryonic Stage

The period in prenatal development from approximately two to eight weeks after fertilization, during which the major organs and structures of the organism develop.

Germinal Stage

The earliest phase in prenatal development, starting from fertilization and lasting until the zygote implants in the uterine wall.

Placental Stage

The third and final stage of childbirth involving the delivery of the placenta from the uterus to the outside world.