1) Compounds composed of carbon, hydrogen, and oxygen collectively are known as: a. Inorganic compounds b. Organic compounds c. Primary compounds d. Essential compounds 2) The Nucleus of an atom contains what? a. Negatively charged protons b. Positively charged protons c. Neutrally charged protons d. Positively charged protons and neutrons 3) What defines the atomic number of an element? a. The number of electrons. b. The number of neutrons c. The number of protons d. None of the above 4) Cells are made up of: a. Carbohydrates b. Lipids c. Proteins d. Nucleic acids e. All of the above 5) What is true about the water cycle? a. All water comes from clouds in the form of rain b. There is no beginning or end, it just keeps repeating c. The water cycle begins with ground water, which leads out to the ocean or sea and is evaporated to form clouds d. None of the above
The Correct Answer and Explanation is :
Here are the correct answers to your questions along with detailed explanations:
1) Compounds composed of carbon, hydrogen, and oxygen collectively are known as:
Answer: b. Organic compounds
Explanation:
Organic compounds are typically carbon-based molecules that contain hydrogen and oxygen. These compounds form the foundation of life, as they include carbohydrates, lipids, proteins, and nucleic acids. The presence of carbon is a defining feature of organic chemistry, distinguishing organic compounds from inorganic compounds, which do not generally contain carbon-hydrogen bonds. For example, glucose (C₆H₁₂O₆) is an organic compound composed of carbon, hydrogen, and oxygen.
2) The Nucleus of an atom contains what?
Answer: d. Positively charged protons and neutrons
Explanation:
The nucleus of an atom contains protons and neutrons. Protons carry a positive charge, while neutrons are neutral (they have no charge). The nucleus is located at the center of the atom, and the number of protons defines the element (its atomic number). Electrons, which have a negative charge, orbit around the nucleus but are not part of it.
3) What defines the atomic number of an element?
Answer: c. The number of protons
Explanation:
The atomic number of an element is defined by the number of protons in its nucleus. This number is unique to each element and determines the element’s identity. For example, carbon has an atomic number of 6 because it has 6 protons in its nucleus. The number of neutrons can vary (resulting in isotopes), and the number of electrons in a neutral atom equals the number of protons.
4) Cells are made up of:
Answer: e. All of the above
Explanation:
Cells are made up of several types of molecules, including carbohydrates, lipids, proteins, and nucleic acids. Each of these plays essential roles:
- Carbohydrates provide energy and structural support.
- Lipids are important for cell membrane structure and energy storage.
- Proteins perform a vast array of functions, including catalyzing chemical reactions (enzymes), providing structural support, and facilitating communication.
- Nucleic acids (DNA and RNA) are responsible for storing and transmitting genetic information. All these components work together to maintain the cell’s structure and functions.
5) What is true about the water cycle?
Answer: b. There is no beginning or end, it just keeps repeating
Explanation:
The water cycle is a continuous process through which water moves between the Earth’s surface and the atmosphere. It includes processes such as evaporation (water turning into vapor from bodies of water), condensation (vapor forming clouds), precipitation (rain, snow, etc.), and runoff (water flowing back to the oceans or lakes). There is no fixed beginning or end point in the water cycle; it is a continuous loop that maintains the balance of water on Earth. While other answers describe parts of the cycle, the correct answer emphasizes the cycle’s perpetual nature.