How many electrons are present in 4He2+?

1. 6

2. 4

3. 1

4. 2

5. 0

6. None of these

7. 3

8. 5

Which isotope of lead has a double magic number? (1) Pb-206 (2) Pb-207 (3) Pb-208 (4) Pb-209

Is petrolatum ionic or covalent

What is the best definition of chemistry? A. The study of mass, energy, and light B. The study of life and energy C. The study of experiments and theories D. The study of matter, its properties, and its reactions

3. What is the standard unit of measure for temperature when discussing gas behavior?

How many electrons are in the second energy level of an atom of each element? A. Chlorine B. Phosphorus C. Potassium

Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). you measure the amount and determine that there are 5 grams of potassium-40 in the rock.

What are some positive and negative effects of the production of maple syrup on society and the environment?

Describe and give an example of parasitism.

Why is a dilute solution of oleic acid used instead of pure oleic acid?

The vapor pressure of benzene (C6H6) is 73.0 mm Hg at 25 °C. What is the vapor pressure of a solution consisting of 179 g of benzene and 0.217 mol of a nonvolatile nonelectrolyte?