Can a element be lost or gained in a chemical reaction

What is the average atomic mass of sodium

Which is the most polar bond? a. H-Se b. P-Br c. N-I d. No right answer.

What is the atmosphere

How do you solve a double replacement reaction?

In a constant pressure calorimeter experiment a student measures a temperature change of 2.5 degrees C. The heat measured was 2.200 kJ. What was the volume of the solution? Assume that Csol=4.18 j/gC

When water is placed in a thin glass tube, it tends to climb up the walls of the tube. This effect is known as capillary action. What causes this capillary action? A. metallic bonding B. covalent bonding C. ionic bonding D. hydrogen bonding

Earth rotates once every 24 hours. What does this mean? A. Earth makes one full trip around the Moon every 24 hours. B. Earth completes a full spin on its axis once every 24 hours. C. Earth makes one full trip around the Sun every 24 hours. D.

Compare and contrast the outer core and the inner core.

What colors make the color turquoise?

12.23 g of ammonia (NH3) are dissolved in enough water to make 560.0 mL of solution. How many moles of NH3 are added to the water?