Which of the following summarizes a change that takes place as a solid turns to a liquid?
A. Particles become less ordered.
B. Intermolecular forces between particles become stronger.
C. Particles move closer together.
D. Particles have a decrease in mobility.
When a solid turns into a liquid during the process of melting, the particles within the solid gain enough energy to overcome the attractive forces holding them in a fixed arrangement. As a result, the particles become less ordered and more mobile, transitioning from a rigid structure to a more fluid state.
Therefore, the Correct Answer is A.
More Questions on TEAS 7 Science
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Q #1: Nitrogen gas is an extremely stable molecule because its structure contains which of the following?
A. lonic bonds
B. Triple covalent bonds
C. Resonance bonds
D. Hydrogen bonds
Answer Explanation
Triple covalent bonds. Nitrogen gas consists of two nitrogen atoms that share three pairs of electrons, forming a triple bond. This bond is very strong and requires a lot of energy to break. Ionic bonds, resonance bonds, and hydrogen bonds are weaker types of bonds that do not occur in nitrogen gas.
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Q #2: A myocardial infarction affects which of the following blood vessels of the heart?
A. Pulmonary
B. Aorta
C. Vena cava
D. Coronary
Answer Explanation
A myocardial infarction (MI), commonly known as a heart attack, occurs when the flow of blood to the heart is blocked. The blockage is usually due to a buildup of fat, cholesterol and other substances in the heart (coronary) arteries. The fatty, cholesterol-containing deposits are called plaques. The process of plaque buildup is called atherosclerosis. Sometimes, a plaque can rupture and form a clot that blocks blood flow. A lack of blood flow can damage or destroy part of the heart muscle.
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Q #3: In the following data table of an experiment carried out at 4° C (39.2° F) over 4 hours, which of the following options represents the dependent variable? Solution in bag Solution outside bag Bag mass change (g) water water -0.2 20% sucrose water +2.4 40% sucrose water +4.3 60% sucrose water +5.8
A. Duration
B. Temperature
C. Sucrose concentrations
D. Bag mass change
Answer Explanation
The dependent variable is the variable that is measured or observed in an experiment. It is the variable that changes as a result of the independent variable, which is the variable that is manipulated or controlled by the experimenter. In this case, the dependent variable is the bag mass change, because it depends on the sucrose concentrations in the bag and outside the bag. The other variables, such as duration, temperature, and sucrose concentrations, are independent variables that are set by the experimenter.
