Q: Use The Periodic Table of the Elements and the information below to answer the question. Magnesium metal (Mg) is grayish-white in color and reacts actively with water. Fluorine (F2) is a greenish-yellow gas at room temperature and is a member of the halogen family. These two elements react to produce magnesium fluoride (MgF2), a chemical commonly used in making windows and lenses. How do the elements magnesium (Mg) and fluorine (F2) produce the compound magnesium fluoride (MgF2)?

OPTIONS:
- by nuclear connection
- by physically combining
- by magnetic connection
- by chemically combining
A: by chemically combining
Q: Which action is an example of good water management?

OPTIONS:
- letting faucets drip
- watering the grass every day
- turning off the faucet when brushing teeth
- running the dishwasher when it is not full
A: turning off the faucet when brushing teeth
Q: Which type of rock is formed when limestone is subjected to heat and pressure?

OPTIONS:
- sandstone
- basalt
- marble
- granite
A: marble
Q: A cat jumps when startled by a loud noise. This is an example of an organism

OPTIONS:
- sensing and responding to its external environment
- sensing and responding to its internal environment
- changing and controlling its external environment
- changing and controlling its internal environment
A:
sensing and responding to its external environment