How many atoms are here in the following?

a. 3N2

b. 2H2O

c. 4HNO3

d. 2Ca (OH) 2

e. 3Ba (ClO3) 2

f. 5Fe (NO3) 2

g. 4Mg3 (PO4) 2

h. 2 (NH4) 2SO4

i. 6Al2 (SeO4) 3

j. 4C3H8

Which statement about the physical change of liquid water boiling into steam is true? a. The heat added represents an energy change. b. The action cannot be reversed. c. The steam cannot conserve mass. d. The weight lost represents a mass change

A Change in matter that can be seen through direct observation are called?

What is the concentration of hydroxide ions in a solution with a pH of 5.24? 5.75 * 10-6 1.74 * 10-9 1.55 * 10-7 4.54 * 10-4

10. What mass of glass (Cp = 0.749 J/gºC) is needed to absorb 5.00x104 J of heat, if it starts at 26.0 C and has a final temperature of 275.0°C?

What would a compound whose molecules contain one boron atom and three fluorine atoms be named?

58.5 million excess electrons are inside a closed surface. What is the net electric flux through the surface?.

Nitrogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called the

What quantity of heat is needed to raise the temperature of 5.0g of a substance from 20 c to 30 c if the specific heat?

Compare mechanical energy and thermal energy.

How many covalent bonds can each carbon atom form?