Which of the following atoms has the same number of neutrons as 19F?

a. 16O

b. 18F

c. 20Ne

d. 23Na

Why substance dissolve?

Why does ice float after it crystallizes? Its specific gravity is greater than water. Its density is greater than water. Its density is less than water. Air trapped in ice causes it to float.

An iron atom has a mass of * 9.2710-23g and a cooking pot has a mass of 0.500kg

How many calories is required to change the temperature of 2.18g of water from 15.3°C to 69.5°C. The specific heat of liquid water is 1.00cal/g°C.

Which group 4A element has the highest ionization energy?

A student records the value 1.5 atm on a data table. The student is measuring what?

How do you percipitate things from solution to telluric acid?

The energy needed to get a reaction started is the a. enzyme energy. b. activation energy. c. catalyst energy. d. chemical energy.

A solution is made by dissolving 8.2 g of NaOH in approximately 450 mL of water in a volumetric flask. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to total 500 mL of solution.

What is the molarity of an aqueous solution containing 40.0 g of glucose (C6H12O6) in 1.5 L of solution?