TEAS 7 Chemistry: Essential Practice for Success

ATI TEAS 7

Chemistry

1. The element responsible for the green color of leaves is:

A. Magnesium
B. Iron
C. Copper
D. Zinc

Correct answer: A

Rationale: Magnesium is the central element of chlorophyll, the pigment responsible for photosynthesis

2. Which element is a component of baking soda and is important for maintaining pH balance in the body?

A. Potassium
B. Sodium
C. Calcium
D. Sodium bicarbonate

Correct answer: D

Rationale: Sodium bicarbonate acts as a base and helps regulate pH in various biological systems

3. Define "acceleration" in terms of motion.

A. Change in velocity over time
B. Speed in a straight line
C. Distance covered in a given time
D. Force applied to an object

Correct answer: a

Rationale: Acceleration measures the rate of change of velocity with respect to time.

4. What is the primary function of hair on the human body?

A. Insulation
B. Sensory perception
C. Protection
D. Vitamin D synthesis

Correct answer: A

Rationale: The primary function of hair on the human body is insulation. Hair acts as a protective layer to help regulate body temperature by trapping heat close to the skin. This insulation property is especially important in colder climates to prevent excessive heat loss from the body. While hair can also provide some level of protection from external elements and minor injuries, its main role is to insulate the body. Sensory perception is mainly attributed to nerve endings in the skin rather than hair. Vitamin D synthesis is primarily dependent on exposure to sunlight rather than hair. Therefore, option A, insulation, is the correct answer.

5. Nutrients are absorbed into the bloodstream through which part of the digestive system?

A. Stomach
B. Large intestine
C. Small intestine
D. Esophagus

Correct answer: C

Rationale: The correct answer is C: Small intestine. The small intestine is where most of the absorption of nutrients takes place in the digestive system. Its inner lining is covered with tiny finger-like projections called villi, which increase the surface area for absorption. Nutrients such as carbohydrates, proteins, fats, vitamins, and minerals are absorbed into the bloodstream through the walls of the small intestine. The stomach primarily helps with the initial digestion of food, the large intestine absorbs water and salts, and the esophagus is the tube that carries food from the mouth to the stomach. Therefore, the small intestine is the main site of nutrient absorption in the digestive system.