ati teas 7 science

Correct Answer: B

Rationale: The correct answer is B. A decomposition reaction involves a single compound breaking down into two or more simpler substances. In choice B, CaCO3 decomposes into CaO and CO2. This reaction follows the general form AB → A + B, making it a clear example of a decomposition reaction. Choices A, C, and D involve synthesis or combination reactions, where simpler substances combine to form a more complex compound, making them incorrect for this question.

Correct Answer: B

Rationale: The correct answer is B: Pivot joint. Pivot joints allow rotational movement around a single axis, such as the rotation of the radius around the ulna in the forearm. This type of joint is designed to facilitate the turning or twisting motion. Ball-and-socket joints (A) allow for multi-axial movement, hinge joints (C) enable movement in one direction like a door hinge, and saddle joints (D) have two saddle-shaped surfaces that allow for movement in multiple directions, but not specifically rotational movement around a single axis.

Correct Answer: A

Rationale: The correct answer is A: Axon. The axon is responsible for transmitting signals away from the cell body towards other neurons or muscles. It is a long, slender projection of the neuron that carries electrical impulses known as action potentials. The axon is covered by the myelin sheath, which helps to speed up the transmission of signals. Summary: - B: Dendrite receives signals from other neurons and transmits them towards the cell body. - C: Synapse is the gap between neurons where neurotransmitters are released to communicate signals. - D: Myelin sheath insulates and speeds up signal transmission along the axon, but it is not responsible for transmitting signals itself.

Correct Answer: B

Rationale: Peristalsis is the correct answer. It is the term for the involuntary muscle contractions that move food through the digestive tract. These contractions help propel food along the digestive system. Segmentation is the process of breaking down food by mixing it with digestive juices. Chyme is the semi-fluid mass of partly digested food in the stomach and intestines. Emulsification is the breakdown of fats into smaller droplets for easier digestion. But none of these terms specifically refer to the muscle contractions that move food through the digestive tract like peristalsis does.

Correct Answer: B

Rationale: The correct answer is B: Identify the group number, which often indicates the typical ionic charge. Rationale: Elements in the same group on the periodic table have similar chemical properties, including their tendency to gain or lose electrons to form ions. The group number corresponds to the number of valence electrons an element has, which determines its typical ionic charge. For example, Group 1 elements tend to lose 1 electron to form a +1 ion, Group 2 elements lose 2 electrons to form a +2 ion, and so on. This pattern helps predict the charge of an ion formed by an element based on its position on the periodic table. Summary: A: Looking for elements with similar atomic weights does not directly relate to predicting the charge of an ion based on the periodic table. C: Identifying the period number does not provide information about the typical ionic charge of an element. D: Analyzing the element's position within the group is important, but the group